JP2012227979A - Coil switching device for ac motor and ac motor drive system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve productivity and reduce manufacturing costs.SOLUTION: A coil switching device 3 for a three-phase AC motor 2 that is supplied with power by an inverter performs coil switching related to a first armature coil 11 and a second armature coil 12 that each have three phases and are provided in the three-phase AC motor 2. The coil switching device 3 has switches S1 to S6 that allow switching between a first state in which power supplied from the inverter is led to the first armature coil 11 out of the first armature coil 11 and the second armature coil 12, and a second state in which the power supplied from the inverter is led to both of the first armature coil 11 and the second armature coil 12. The switches S1 to S6 have at least one semiconductor module that is provided with two sets of switches each including three respective insulated gate bipolar transistor elements corresponding to the three phases and that is formed by integrating the six insulated gate bipolar transistor elements included in the two sets of switches.

Description

  The present invention relates to an AC motor winding switching device and an AC motor drive system.

  2. Description of the Related Art Conventionally, AC motors that perform drive control with an AC variable frequency power source have been widely used as drive sources for machine tools and vehicles. This AC motor is provided with the same number of windings as the number of phases of the AC variable frequency power source as an armature, and there are, for example, a Y connection or a delta connection in the case of three phases. Further, in recent years, for the purpose of speed control and torque control of this AC motor, the AC motor has two sets of windings corresponding to the number of power supply phases therein, and the AC variable for these two sets of windings. A winding switching device has been proposed in which the field of the armature is changed stepwise by switching the connection with the frequency power supply.

  As an example of a conventional winding switching device, for example, there is one described in Patent Document 1. The winding switching device described in Patent Document 1 is a Y-connected state with only one set of windings of two sets of windings by a combination of switching of two switches provided in the winding switching device, It becomes possible to switch to a Y-connected state as a whole where two sets of windings are connected in series.

  In a Y-connected state with only one set of windings, since the impedance is low, a sufficient current can flow even in a high-frequency region, which is suitable for high-speed operation. In addition, in the Y-connected state with the two sets of windings connected in series, since the impedance is high, a sufficient voltage can be applied even in the low frequency region, and a large torque is generated for the same current, resulting in low speed operation. It becomes suitable for.

Japanese Patent No. 3948209

  However, the conventional winding switching device is composed of three switch elements in which a plurality of switches provided therein are individually provided corresponding to each phase, that is, three times the number of switches. As many switch elements as possible were installed as independent parts. For this reason, the wiring inside the winding switching device becomes complicated and the design and assembly process becomes complicated, the installation area of the switch increases, and the entire winding switching device becomes large. As a result, this has contributed to a decrease in productivity and an increase in manufacturing cost of the winding switching device.

  An object of the present invention is to provide a winding switching device for an AC motor that can improve productivity and reduce manufacturing costs.

  In order to achieve the above object, the first invention of the present application performs winding switching related to the three-phase first armature winding and the second armature winding provided in the AC motor fed by the inverter. A winding switching device for a phase AC motor, wherein the first state of guiding power supplied from the inverter to the first armature winding of the first armature winding and the second armature winding; The semiconductor switch means is switchable between a second state in which power supplied from the inverter is guided to both the first armature winding and the second armature winding, and the semiconductor switch means includes the three-phase 2 sets of switch elements each consisting of three insulated gate bipolar transistor elements corresponding to each of the above, and six insulated gate bipolar transistor elements included in the two sets of switch elements are integrated. The semiconductor module, characterized in that it comprises at least one.

  In the first invention of this application, the semiconductor switch means switches between the first state suitable for high speed driving and the second state suitable for low speed driving. At this time, the electrical switching between the first armature winding and the second armature winding can be instantaneously switched by the insulated gate bipolar transistor element provided in the semiconductor switch means. As a result, for example, electrical shock such as chattering that occurs in the case of mechanical switch means can be eliminated, and mechanical shock can be prevented by suppressing torque loss and braking torque generated when the switching period is long.

  On the other hand, a semiconductor module constructed by integrating six insulated gate bipolar transistor elements is highly versatile, and semiconductor packages incorporating one or more such semiconductor modules have already been widely manufactured and distributed. Yes. In the first invention, such a highly versatile semiconductor module is used for the semiconductor switch means. As a result, the wiring can be simplified and widely applied to circuit designs having various configurations, and the assembly process can be simplified. In addition, the winding switching device can be reduced in size by reducing the installation area of the switch. As a result, the productivity of the winding switching device can be improved and the manufacturing cost can be reduced.

  According to a second invention, in the first invention, the semiconductor switch means connects a first electrical neutral point corresponding to the first state and the first armature winding in the first state, First switch means for interrupting the first electrical neutral point and the first armature winding in the second state; and the first armature winding and the second armature in the second state. A second switch means for connecting the windings in series and cutting off the first armature winding and the second armature winding in the first state; The wire is connected to a second electrical neutral point corresponding to the second state at the second winding output terminal opposite to the side connected to the second switch means, and the semiconductor module is connected to the first switch. Three insulated gate types of the switch element provided in the switch means And Ipora transistor element, and three insulated gate bipolar transistor element of the switching element provided in the second switch means, characterized in that are provided integrally.

  The first state for the Y connection using two armature windings by connecting the first electrical neutral point and the second electrical neutral point using the first switch means and the second switch means. And the second state can be realized with a simple wiring configuration. When both the first armature winding and the second armature winding are housed in one housing to form one motor, the second electrical neutral point is inside the housing. By being formed at the winding end portion of the sub-winding, it is possible to eliminate the external wiring, facilitate the assembly of the AC motor, and improve the productivity.

  According to a third invention, in the second invention, the semiconductor switch means further supplies power supplied from the inverter to the second armature winding of the first armature winding and the second armature winding. Can be switched between a third state for guiding power and a fourth state for guiding power supplied from the inverter to both the first armature winding and the second armature winding. In the fourth state, a second winding input terminal connected to the second switch means of the second armature winding is connected to the inverter, and the second state in the first state and the second state. Third switch means for shutting off the winding input terminal and the inverter is provided, and the first switch means shuts off the first electrical neutral point and the first armature winding in the third state. And in the fourth state The first electrical neutral point and the first armature winding are connected to each other, and the second switch means is configured to connect the first armature winding and the second armature in the third state and the fourth state. The armature winding is cut off, and the semiconductor module includes three insulated gate bipolar transistor elements of the switch element provided in the first switch means, and three of the switch elements provided in the second switch means. A combination of two insulated gate bipolar transistor elements, or three insulated gate bipolar transistor elements of the switch element provided in the second switch means, and three of the switch elements provided in the third switch means. Any combination of two insulated gate bipolar transistor elements is provided as an integrated unit. And said that you are.

  In the third invention, in addition to the second invention, a third state in which the power supplied from the inverter is guided only to the second armature winding and operated, and the first armature winding and the second armature winding. Thus, it is possible to realize the fourth state in which the power supplied from the inverter is guided and operated in parallel. As a result, switching of the four states of the first to fourth states with respect to the Y connection using two armature windings can be realized with a simple wiring configuration.

  According to a fourth invention, in the first invention, the first armature winding and the second armature winding are connected in series, and the semiconductor switch means is in the first state in the first state. Connecting the first electrical neutral point corresponding to the first armature winding and the first electrical neutral point and the first armature winding in the second state, When the first switch means is connected to the second armature winding and the second electrical neutral point corresponding to the second state in the second state and the Y connection, the first state Or in the second state and in the delta connection, the fourth switch means for cutting off the second electrical neutral point and the second armature winding, and the delta connection in the second state. In some cases, the first armature winding and the second electric machine connected in series A second winding output terminal opposite to the side connected to the first armature winding of the second armature winding is connected to the inverter so as to form a delta connection with both of the windings. And a fifth switch means for shutting off the second winding output terminal of the second armature winding and the inverter in the first state or the second state and in the Y connection. The semiconductor module includes three insulated gate bipolar transistor elements of the switch element provided in the fourth switch means, and three insulated gate bipolar transistor elements of the switch element provided in the fifth switch means. Are provided integrally.

  This makes it easy to switch between the first and second states for the Y connection using two armature windings and the second state for the delta connection using two armature windings. Can be realized.

  In a fifth aspect based on the first aspect, the semiconductor switch means connects the first armature winding and the second armature winding in series in the second state, and in the first state, The first electric machine is configured to form a delta connection with the second switch means for cutting off the first armature winding and the second armature winding, and the first armature winding in the first state. A first winding output terminal opposite to a side connected to the inverter of the child winding is connected to the inverter, and the first winding output terminal of the first armature winding in the second state; A sixth switch means for shutting off the inverter; a second winding output terminal on the opposite side to the side connected to the second switch means of the second armature winding in the first state; and the inverter And shut off the The second armature winding terminal of the second armature winding and the inverter are configured to form a delta connection with the first armature winding and the second armature winding connected in series in two states. A seventh switch means for connection, wherein the semiconductor module comprises three insulated gate bipolar transistor elements of the switch element provided in the second switch means, and the switch provided in the sixth switch means A combination of three insulated gate bipolar transistor elements of the element, or three insulated gate bipolar transistor elements of the switch element provided in the seventh switch means, and the switch provided in the sixth switch means Any combination of the elements with three insulated gate bipolar transistor elements Sega, and it is provided integrally.

  Thus, switching between the first state and the second state for the delta connection using two armature windings can be realized with a simple wiring configuration.

  In a sixth aspect based on the fifth aspect, the semiconductor switch means further supplies power supplied from the inverter to the second armature winding of the first armature winding and the second armature winding. Can be switched between a third state for guiding power and a fourth state for guiding power supplied from the inverter in parallel to both the first armature winding and the second armature winding. And in the fourth state, a second winding input terminal connected to the second switch means of the second armature winding is connected to the inverter, and in the first state and the second state, Third switch means for cutting off the second winding input terminal and the inverter is provided, and the second switch means includes the first armature winding and the first state in both the third state and the fourth state. Shield the second armature winding The sixth switch means shuts off the first winding output terminal of the first armature winding and the inverter in the third state, and disconnects the first armature winding in the fourth state. The first winding output terminal of the first armature winding is connected to the inverter so as to constitute a delta connection, and the seventh switch means is configured to operate in the third state and the fourth state. The second winding output terminal of the second armature winding is connected to the inverter so as to form a delta connection with the second armature winding, and the semiconductor module is provided in the second switch means. Combination of three insulated gate bipolar transistor elements of the switch element and three insulated gate bipolar transistor elements of the switch element provided in the sixth switch means A combination of three insulated gate bipolar transistor elements of the switch element provided in the second switch means and three insulated gate bipolar transistor elements of the switch element provided in the third switch means; A combination of three insulated gate bipolar transistor elements of the switch element provided in the three switch means and three insulated gate bipolar transistor elements of the switch element provided in the sixth switch means, the third switch A combination of three insulated gate bipolar transistor elements of the switch element provided in the means, and three insulated gate bipolar transistor elements of the switch element provided in the seventh switch means, and the seventh switch Preparation And at least one combination of the three insulated gate bipolar transistor elements of the switch element and the three insulated gate bipolar transistor elements of the switch element provided in the sixth switch means. It is characterized by being provided integrally.

  Thereby, the power supplied from the inverter is supplied in parallel to both the first armature winding and the second armature winding in the third state in which the power supplied from the inverter is guided to the second armature winding. The fourth state of guiding and operating is possible. As a result, switching of the four states of the first to fourth states with respect to the delta connection using two armature windings can be realized with a simple wiring configuration.

  In a seventh aspect based on the first aspect, the semiconductor switch means further supplies power supplied from the inverter to the second armature winding out of the first armature winding and the second armature winding. And a fourth state in which power supplied from the inverter is guided in parallel to both the first armature winding and the second armature winding, and the first state can be switched. In the fourth state and the Y connection, the first electrical neutral point corresponding to the first state and the first armature winding are connected, and the second state and the third state Or an eighth switch means for interrupting the first electrical neutral point and the first armature winding in the first state and the fourth state and in the delta connection, and in the second state The first armature winding and the second armature winding A ninth switch means for connecting to a row and interrupting the first armature winding and the second armature winding in the first state, the third state, and the fourth state; In the third state and the fourth state, the second winding input terminal on the side connected to the second switch means of the second armature winding is connected to the inverter, and the first state and the second state The third switch means for cutting off the second winding input terminal and the inverter in the second state, the second state, the third state, and the fourth state, and when the Y connection is made When the corresponding second electrical neutral point and the second armature winding are connected, and in the first state or the second state, the third state, and the fourth state, the delta connection is used. In the second electrical neutral point Ninth switch means for interrupting the second armature winding, and the first armature winding connected in series in the second state, the third state, and the fourth state and in the delta connection. A second winding output terminal opposite to the side connected to the first armature winding of the second armature winding so that a delta connection is formed by both the wire and the second armature winding; A second winding output terminal of the second armature winding in the case where the inverter is connected and the first state, the second state, the third state, and the fourth state are Y-connected. And the inverter of the first armature winding so as to form a delta connection with the first armature winding in the first state and the fourth state. First winding output terminal on the opposite side to the connected side And an eleventh switch means for shutting off the first winding output terminal of the first armature winding and the inverter in the second state and the third state. The semiconductor module includes: three insulated gate bipolar transistor elements of the switch element provided in the eighth switch means; and three insulated gate bipolar transistor elements of the switch element provided in the ninth switch means. A combination of three insulated gate bipolar transistor elements of the switch element provided in the eighth switch means and three insulated gate bipolar transistor elements of the switch element provided in the twelfth switch means, The switch element provided in the ninth switch means A combination of three insulated gate bipolar transistor elements and three insulated gate bipolar transistor elements of the switch element provided in the third switch means, and three of the switch elements provided in the ninth switch means A combination of an insulated gate bipolar transistor element and three insulated gate bipolar transistor elements of the switch element provided in the twelfth switch means, and three insulated gates of the switch element provided in the third switch means Combination of a bipolar bipolar transistor element and three insulated gate bipolar transistor elements of the switch element provided in the eleventh switch means, and three insulated gate bipolar transistors of the switch element provided in the third switch means A combination of the three transistor gate elements and the three insulated gate bipolar transistor elements of the switch element provided in the twelfth switch means; and the three insulated gate bipolar transistor elements of the switch element provided in the eleventh switch means. A combination of a transistor element and three insulated gate bipolar transistor elements of the switch element provided in the twelfth switch means, and three insulated gate bipolar transistors of the switch element provided in the tenth switch means A combination of at least one of a combination of a transistor element and three insulated gate bipolar transistor elements of the switch element included in the eleventh switch means is provided. .

  In the seventh invention, the first state in which the power supplied from the inverter is guided only to the first armature winding and operated, and the inverter is connected in series to both the first armature winding and the second armature winding. A second state in which the power supplied from the inverter is operated, a third state in which the power supplied from the inverter is guided to the second armature winding, and the first armature winding and the second armature winding. In addition, the Y connection and the delta connection can be selectively switched in each of the fourth state in which the power supplied from the inverter is guided and operated in parallel. Thereby, switching of the eight states of the 1st-4th state in the said Y connection which uses two armature windings, and the 1st-4th state in the said delta connection is realizable.

  According to an eighth aspect of the present invention, the semiconductor module according to any one of the second to seventh aspects, wherein the semiconductor module is a normally-on type switch, the switch element including three insulated gate bipolar transistor elements, and a normally-off type switch. And the switch element composed of the three insulated gate bipolar transistor elements.

  When switching between the first state and the second state by using a normally-on type on one switch element side and a normally-off type opposite to the above on the other switch element side, one switch element side And the other switch element side can share a drive signal.

  A ninth invention is characterized in that in any one of the second to eighth inventions, abnormality detection of the inverter or the AC motor is provided.

  When an abnormality is detected from the inverter or AC motor, that is, an abnormality related to speed detection, such as failure of the speed detector provided in the AC motor, disconnection of various signal lines, or malfunction of the speed calculator, is detected. In this case, it is considered as an emergency, and the switching control device switches the path switching means of the winding switching device to the connected / shut off state corresponding to the emergency. In the switching state corresponding to this emergency, the voltage applied to each of the two armature windings is minimized to protect each switch element, particularly the switch element disposed between the two armature windings from overvoltage. can do.

  According to a tenth aspect, in the ninth aspect, the path switching means also serves as the switch element.

  Thereby, each switch element can be protected from an overvoltage with a simple configuration without separately providing a dedicated switch for emergency.

  An eleventh aspect of the present invention is an AC motor drive system including the AC motor winding switching device according to any one of the first to tenth aspects of the present invention, wherein the AC motor includes a plurality of armatures having the same number of turns in each phase. The winding switching device is capable of switching the plurality of electric coil windings to at least three winding states by appropriately combining conduction and blocking of the plurality of semiconductor switch elements, and the AC motor. And a switching control device that performs switching control of the winding switching device.

  A twelfth invention according to the eleventh invention further comprises a sensor for detecting various abnormalities in the entire AC motor drive system or an application including the AC motor drive system, wherein the switching control device detects a detection signal of the sensor. And switching control of the winding switching device based on the above.

  Accordingly, the AC motor drive system or these can be applied to an application.

  According to the present invention, it is possible to improve the productivity of the winding switching device and reduce the manufacturing cost.

It is the block diagram which showed typically the structure of the AC motor drive system provided with the coil | winding switching apparatus which concerns on embodiment of this invention. It is a figure which shows the circuit structure of a coil | winding switching device and a three-phase AC motor. It is a figure which shows the semiconductor module which integrated the 1st switch and the 2nd switch. It is a figure which shows the semiconductor module which integrated the 1st switch and the 6th switch. It is a figure which shows the semiconductor module which integrated the 2nd switch and the 3rd switch. It is a figure which shows the semiconductor module which integrated the 3rd switch and the 5th switch. It is a figure which shows the semiconductor module which integrated the 3rd switch and the 6th switch. It is a figure which shows the semiconductor module which integrated the 5th switch and the 6th switch. It is a figure which shows the semiconductor module which integrated the 4th switch and the 5th switch. It is a figure which shows the semiconductor module which integrated the 2nd switch and the 6th switch. It is a table which shows the content of the switching control which a switching control apparatus performs with respect to each switch of a coil | winding switching apparatus. It is a figure which shows the circuit structure of the coil | winding switching apparatus and 3-phase alternating current motor in a 1st modification. It is a table which shows the content of the switching control which the switching control apparatus in a 1st modification performs with respect to each switch of a coil | winding switching apparatus. It is a figure which shows the circuit structure of the coil | winding switching apparatus and 3 phase alternating current motor in a 2nd modification. It is a table which shows the content of the switching control which the switching control apparatus in a 2nd modification performs with respect to each switch of a coil | winding switching apparatus. It is a figure which shows the circuit structure of the coil | winding switching apparatus and 3 phase alternating current motor in a 3rd modification. It is a table which shows the content of the switching control which the switching control apparatus in a 3rd modification performs with respect to each switch of a coil | winding switching apparatus. It is a figure which shows the circuit structure of the coil | winding switching apparatus and 3 phase alternating current motor in a 4th modification. It is a table which shows the content of the switching control which the switching control apparatus in a 4th modification performs with respect to each switch of a coil | winding switching apparatus. It is a figure which shows the circuit structure of the coil | winding switching apparatus and 3 phase alternating current motor in a 5th modification. It is a table which shows the content of the switching control which the switching control apparatus in a 5th modification performs with respect to each switch of a coil | winding switching apparatus. It is a figure which shows the circuit structure of the coil | winding switching apparatus and 3-phase alternating current motor in a 6th modification. It is a table which shows the content of the switching control which the switching control apparatus in a 6th modification performs with respect to each switch of a coil | winding switching apparatus.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram schematically showing the configuration of an AC motor drive system including a winding switching device according to an embodiment of the present invention.

  In FIG. 1, an AC motor drive system 100 drives a three-phase AC motor 2, and includes an inverter 1, the three-phase AC motor 2 as an AC motor, a winding switching device 3, a sensor 4, and the like. The switching control device 5 is provided.

  In this example, the inverter 1 includes six switch elements SW made of a semiconductor, and is composed of a bridge in which two sets of switch elements SW connected in series are connected in parallel. Single-phase DC power is supplied to the entire bridge, and the six switch elements SW are repeatedly turned on and off in an appropriate order, thereby allowing three-phase AC power U from between two switch elements SW connected in series in each group. , V, W are output as inverter outputs.

  The three-phase AC motor 2 is a motor driven by the three-phase AC power source output from the inverter 1, and only the winding for performing field control is shown as an armature in the drawing. The three-phase AC motor 2 used in the present embodiment has two armature windings in which three windings having the same number of turns are arranged in parallel corresponding to the respective phases U, V, and W of the three-phase AC, that is, the first An armature winding 11 and a second armature winding 12 are provided. These two armature windings 11 and 12 are not electrically connected to each other in the three-phase AC motor 2, and input terminals and output terminals that can be electrically connected from the outside of the three-phase AC motor 2 are respectively provided. Is provided. The first armature winding 11 has a first input terminal (first winding input terminal) 11a (U1, V1, W1) and a first output terminal (first winding output terminal) to the outside of the three-phase AC motor 2. ) 11b (U2, V2, W2) can be electrically connected. The second armature winding 12 has a second input terminal (second winding input terminal) 12a (U3, V3, W3) and a second output terminal (second winding output terminal) to the outside of the three-phase AC motor 2. ) 12b (U4, V4, W4) can be electrically connected (however, as will be described later, the first output terminal 11b, the second input terminal 12a, and the second output terminal 12b are not connected from the outside). With exceptions). The three-phase AC motor 2 can be applied to any of an induction type, a synchronous type, a rotary type, and a direct acting type. Although not particularly shown, the two armature windings 11 and 12 are classified into those types. Appropriately configured and arranged according to the difference.

  The winding switching device 3 includes a plurality of semiconductor switch elements as will be described in detail later. The inverter outputs U, V, W, the first input terminal 11a (U1, V1, W1), and the first output terminal 11b are switched by switching the conduction and interruption of the plurality of semiconductor switch elements in an appropriate combination. (U2, V2, W2), the second input terminal 12a (U3, V3, W3) and the second output terminal 12b (U4, V4, W4) are switched between conduction and interruption. The connection circuit configuration inside the winding switching device 3 is different between this embodiment and each modification described later (details will be described later).

  The sensor 4 includes the entire AC motor drive system 100 of the present embodiment including the inverter 1, the three-phase AC motor 2, and the winding switching device 3, and applications including the AC motor drive system 100 (for example, trains and electric vehicles). Various abnormalities in the entire vehicle, machine tool, etc.) are detected and a detection signal is output to the switching control device 5.

  The switching control device 5 includes a CPU, a RAM, a ROM, an A / D converter, and the like that are not particularly shown. This switching control device 5 conducts and cuts off each of the internal six switch elements SW so as to cause the inverter 1 to output three-phase AC power at an appropriate frequency based on a command from a host control device (not shown). Switching control is performed. At the same time, the switching control device 5 performs switching control of conduction and disconnection between the inverter output and the terminals 11a, 11b, 12a, 12b of the armature windings 11, 12 by the winding switching device 3. . In the present embodiment, the winding switching device 3 includes a first state in which the inverter output is guided only to the first armature winding 11 out of the first armature winding 11 and the second armature winding 12, and A second state in which the inverter output is guided to the entirety of the first armature winding 11 and the second armature winding 12 electrically connected in series, and a third state in which the inverter output is guided only to the second armature winding 12 And the fourth state in which the inverter output is led to both the first armature winding 11 and the second armature winding 12 electrically connected in parallel, respectively, in the case of Y connection and in the case of delta connection. Switch separately. That is, a total of eight states can be switched between each of the first to fourth states of the Y connection and each of the first to fourth states of the delta connection. Further, the winding switching device 3 includes, in addition to these eight states, an emergency state that minimizes the voltage applied to the armature windings 11 and 12 when an abnormality is detected from the sensor 4. In addition, a total of nine states can be selectively switched (detailed later).

  FIG. 2 is a diagram illustrating a circuit configuration of the winding switching device 3 and the three-phase AC motor 2 in the present embodiment. In FIG. 2, the winding switching device 3 is connected so that the inverter output is directly input to the first input terminal 11a. The first output terminal 11b is connected to the first electrical neutral point 13 that short-circuits the wiring of each phase to one point via the first switch S1 as the eighth switch means, and as the ninth switch means. The second switch S2 is directly connected to the second input terminal 12a. The second input terminal 12a is directly connected to the inverter 1 via a third switch S3 as third switch means. Further, the second output terminal 12b is connected to the second electrical neutral point 14 that short-circuits the wiring of each phase to one point via the fourth switch S4 as the tenth switch means, and as the eleventh switch means. The fifth switch S5 is connected to the inverter 1. The first output terminal 11b is connected to the inverter 1 via a sixth switch S6 as a twelfth switch means.

  Here, with respect to the connection between the first output terminal 11b and the inverter 1 via the sixth switch S6, the corresponding phase wirings are not connected to each other, but the U phase of the first output terminal 11b (U2 in the figure). ) Is connected to the V phase (V in the figure) of the inverter 1, the V phase (V2 in the figure) of the first output terminal 11b is connected to the W phase (W in the figure) of the inverter 1, and the first output The W phase (W2 in the figure) of the terminal 11b is connected to the U phase (U in the figure) of the inverter 1. Thus, when the sixth switch S6 is connected, only the first armature winding 11 forms a delta connection. The same applies to the connection between the second output terminal 12b and the inverter 1 via the fifth switch S5.

  Each of the six switches, that is, the first to sixth switches S1 to S6 is configured by a set of three semiconductor switch elements that electrically connect and disconnect the wirings corresponding to the three phases. That is, switching control is performed individually for each switch S1 to S6 by switching control from the switching control device 5, and the three semiconductor switch elements in each of the switches S1 to S6 perform the same switching operation collectively.

  Further, in the present embodiment, each semiconductor switch element is configured by an IGBT (Insulated Gate Bipolar Transistor) element using, for example, SiC and GaN. Then, as shown in FIG. 3, six IGBT elements 15A, 15B, 15C, 15D, 15E, and 15F, which are the combination of the first switch S1 and the second switch S2, are provided as a single semiconductor module 16A. It has been.

  In this semiconductor module 16A, two IGBT elements 15A, 15D (and 15B, 15E, and 15C, 15F) connected in series are arranged in parallel, and both ends of each set are connected in series with each other. The middle point can be connected as a module terminal. The semiconductor module 16A including the six IGBT elements 15A to 15F having such a wiring configuration is highly versatile because it can be used for circuit designs having various configurations, and is currently a semiconductor in which one or a plurality of the semiconductor modules 16A are incorporated. Packages are widely manufactured and distributed in general. As a result, the module unit cost can be made relatively low.

  In the example shown in FIG. 3, among the two IGBT elements 15A, 15D (and 15B, 15E, and 15C, 15F) connected in series in each of the three sets, three IGBT elements 15D, 15E and 15F can be used as the first switch S1, and the corresponding three IGBT elements 15A, 15B, and 15C can be used as the second switch S2. Then, three sets of module terminals of corresponding combinations (the midpoint of the series connection in each set) can be connected to the first output terminal 11b, the second input terminal 12a, and the first electrical neutral point 13, respectively. .

  As described above, the first to sixth switches S1 to S6 constituted by the semiconductor switch elements which are IGBT elements respectively constitute the switch elements described in the respective claims, and the entirety of the first to sixth switches S1 to S6 constitute the semiconductor switch means described in the respective claims. Configure.

  In addition to the combination of the first switch S1 and the second switch S2 in the example shown in FIG. 3, it can be integrated as one semiconductor module by a combination of two switches as shown below. For example, as shown in FIG. 4, a combination of the first switch S1 and the sixth switch S6 can be integrated as one semiconductor module 16B. In this case, the three module terminals on the first switch S1 side are connected to the first electrical neutral point 13, the three module terminals on the sixth switch S6 side are connected to the inverter 1, and the two switches S1 , S6, the three module terminals connected to the midpoint of the series connection may be connected to the first output terminal 11b. It should be noted that the module terminal on the sixth switch S6 side needs to be connected in different phases to each phase U2, V2, W2 of the first output terminal 11b connected to the three module terminals at the intermediate point. That is, the module terminal on the sixth switch S6 side corresponding to the intermediate point connected to the U2 phase of the first output terminal 11b is connected to the V phase of the inverter 1, and the intermediate point connected to the V2 phase of the first output terminal 11b. The corresponding module terminal on the sixth switch S6 side is connected to the W phase of the inverter 1, and the module terminal on the sixth switch S6 side corresponding to the intermediate point connected to the W2 phase of the first output terminal 11b is the U phase of the inverter 1. Need to connect to.

  For example, as shown in FIG. 5, a combination of the second switch S2 and the third switch S3 can be integrated as a single semiconductor module 16C. In this case, the three module terminals on the second switch S2 side are connected to the first output terminal 11b, the three module terminals on the third switch S3 side are connected to the inverter 1, and the two switches S2 and S3 are connected. What is necessary is just to connect three module terminals connected to the intermediate point of series connection to the 2nd input terminal 12a. Note that the three sets of module terminals can be connected to each other as they are.

  For example, as shown in FIG. 6, a combination of the third switch S3 and the fifth switch S5 can be integrated as one semiconductor module 16D. In this case, three module terminals on the third switch S3 side are connected to the second input terminal 12a, three module terminals on the fifth switch S5 side are connected to the second output terminal 12b, and these two switches S3 are connected. , S5, the three module terminals connected to the midpoint of the series connection may be connected to the inverter 1. Note that the module terminal on the fifth switch S5 side needs to be connected in different phases to each phase U, V, W of the inverter 1 connected to the three module terminals at the intermediate point. That is, the module terminal on the fifth switch S5 side corresponding to the intermediate point connected to the U phase of the inverter 1 is connected to the W4 phase of the second output terminal 12b, and the intermediate point corresponding to the intermediate point connected to the V phase of the inverter 1. The module terminal on the 5th switch S5 side is connected to the U4 phase of the second output terminal 12b, and the module terminal on the 5th switch S5 side corresponding to the intermediate point connected to the W phase of the inverter 1 is the V4 phase of the second output terminal 12b. Need to connect to.

  For example, as shown in FIG. 7, a combination of the third switch S3 and the sixth switch S6 can be integrated as one semiconductor module 16E. In this case, three module terminals on the third switch S3 side are connected to the second input terminal 12a, three module terminals on the sixth switch S6 side are connected to the first output terminal 11b, and these two switches S3 are connected. , S6, the three module terminals connected to the midpoint of the series connection may be connected to the inverter 1. It should be noted that the module terminal on the sixth switch S6 side needs to be connected in different phases to each phase U, V, W of the inverter 1 connected to the three module terminals at the intermediate point. In other words, the module terminal on the sixth switch S6 side corresponding to the intermediate point connected to the U phase of the inverter 1 is connected to the W2 phase of the first output terminal 11b, and the first corresponding to the intermediate point connected to the V phase of the inverter 1. The module terminal on the 6th switch S6 side is connected to the U2 phase of the second output terminal 11b, and the module terminal on the 6th switch S6 side corresponding to the intermediate point connected to the W phase of the inverter 1 is the V2 phase of the first output terminal 11b. Need to connect to.

  For example, as shown in FIG. 8, a combination of the fifth switch S5 and the sixth switch S6 can be integrated as one semiconductor module 16F. In this case, the three module terminals on the fifth switch S5 side are connected to the second output terminal 12b, the three module terminals on the sixth switch S6 side are connected to the first output terminal 11b, and the two switches S5 are connected. , S6, the three module terminals connected to the midpoint of the series connection may be connected to the inverter 1. Note that the phase of the module terminal on the fifth switch S5 side and the module terminal on the sixth switch S6 side is changed for each phase U, V, W of the inverter 1 connected to the three module terminals at the intermediate point. Need to connect. That is, the module terminal on the fifth switch S5 side corresponding to the intermediate point connected to the U phase of the inverter 1 is connected to the W4 phase of the second output terminal 12b, and the module terminal on the sixth switch S6 side corresponding to the same intermediate point. Is connected to the W2 phase of the first output terminal 11b. The module terminal on the fifth switch S5 side corresponding to the intermediate point connected to the V phase of the inverter 1 is connected to the U4 phase of the second output terminal 12b, and the module terminal on the sixth switch S6 side corresponding to the same intermediate point is connected. Connect to the U2 phase of the first output terminal 11b. The module terminal on the fifth switch S5 side corresponding to the intermediate point connected to the W phase of the inverter 1 is connected to the V4 phase of the second output terminal 12b, and the module terminal on the sixth switch S6 side corresponding to the same intermediate point. Must be connected to the V2 phase of the first output terminal 11b.

  For example, as shown in FIG. 9, a combination of the fourth switch S4 and the fifth switch S5 can be integrated as one semiconductor module 16G. In this case, the three module terminals on the fourth switch S4 side are connected to the second electrical neutral point 14, the three module terminals on the fifth switch S5 side are connected to the inverter 1, and the two switches S4 are connected. , S5, the three module terminals connected to the midpoint of the series connection may be connected to the second output terminal 12b. Note that the module terminal on the fifth switch S5 side needs to be connected in different phases to each phase U4, V4, W4 of the second output terminal 12b connected to the three module terminals at the intermediate point. That is, the module terminal on the fifth switch S5 side corresponding to the intermediate point connected to the U4 phase of the second output terminal 12b is connected to the V phase of the inverter 1, and the intermediate point connected to the V4 phase of the second output terminal 12b. The corresponding module terminal on the fifth switch S5 side is connected to the W phase of the inverter 1, and the module terminal on the fifth switch S5 side corresponding to the intermediate point connected to the W4 phase of the second output terminal 12b is the U phase of the inverter 1. Need to connect to.

  For example, as shown in FIG. 10, a combination of the second switch S2 and the sixth switch S6 can be integrated as one semiconductor module 16H. In this case, the three module terminals on the second switch S2 side are connected to the second input terminal 12a, the three module terminals on the sixth switch S6 side are connected to the inverter 1, and the two switches S2 and S6 are connected. What is necessary is just to connect three module terminals connected to the midpoint of series connection to the 1st output terminal 11b. It should be noted that the module terminal on the sixth switch S6 side needs to be connected in different phases to each phase U2, V2, W2 of the first output terminal 11b connected to the three module terminals at the intermediate point. That is, the module terminal on the sixth switch S6 side corresponding to the intermediate point connected to the U2 phase of the first output terminal 11b is connected to the V phase of the inverter 1, and the intermediate point connected to the V2 phase of the first output terminal 11b. The corresponding module terminal on the sixth switch S6 side is connected to the W phase of the inverter 1, and the module terminal on the sixth switch S6 side corresponding to the intermediate point connected to the W2 phase of the first output terminal 11b is the U phase of the inverter 1. Need to connect to.

  The winding switching device 3 may include a plurality of semiconductor modules 16A to 16H. For example, the semiconductor module 16A incorporating the first switch and the second switch shown in FIG. 3 and the third switch shown in FIG. A plurality of semiconductor modules with combinations in which the switches incorporated in each of the semiconductor modules 16E incorporating the sixth switch and the semiconductor modules 16G incorporating the fourth switch and the fifth switch shown in FIG. 9 do not overlap. You may make it provide 16A thru | or 16H.

  FIG. 11 is a table showing the contents of the switching control performed by the switching control device 5 on the switches S1 to S6 of the winding switching device 3 in the present embodiment.

  As described above, in the present embodiment, the winding switching device 3 has the first state in which the inverter output is guided to the first armature winding 11, the first armature winding 11, and the second armature winding 12. A second state in which the inverter output is guided to the whole electrically connected in series, a third state in which the inverter output is guided only to the second armature winding 12, and the first armature winding 11 and the second armature winding 12 Are switched in distinction between the Y connection and the delta connection, and each armature is detected when an abnormality is detected from the sensor 4. A total of nine states including an emergency state in which the voltage applied to the windings 11 and 12 is minimized are selectively switched.

  Specifically, as shown in FIG. 11, when realizing the first state in the Y connection, the switching control device 5 turns on the first switch S1 of the winding switching device 3 (conduction; the same applies hereinafter). The second to sixth switches S2 to S6 are all turned off (blocked; the same applies hereinafter). As a result, only the first armature winding 11 that is Y-connected is switched to the first state in which the inverter 1 is connected. At this time, since the impedance is low, a sufficient current can flow even in the high frequency region, and a state suitable for driving the three-phase AC motor 2 at high speed is obtained.

  Further, when realizing the second state in the Y connection, the first switch S1 is turned OFF, the second switch S2 is turned ON, the third switch S3 is turned OFF, the fourth switch S4 is turned ON, and the fifth switch -6 switches S5 to S6 are turned OFF. As a result, the first armature winding 11 and the second armature winding 12 are connected in series, and the whole is connected to the inverter 1 as a Y connection via the second electrical neutral point 14. It is switched to the second state. At this time, since the impedance is high, a sufficient voltage can be applied even in a low frequency region, and a large torque can be generated in the three-phase AC motor 2 with respect to the same current, which is suitable for low-speed driving. Become.

  The switching between the first state and the second state described above may be performed by switching to the first state when the rotational speed of the three-phase AC motor 2 is faster than a predetermined threshold speed, and to the second state when it is slow, for example. Alternatively, switching may be performed according to the relationship between the induced voltage and the DC voltage.

  Further, when realizing the third state in the Y connection, the first and second switches S1 and S2 are turned off, the third to fourth switches S3 to S4 are turned on, and the fifth to sixth switches S5 to S6 are turned off. And As a result, only the second armature winding 12 Y-connected is switched to the third state in which the inverter 1 is connected. In this case, although depending on the number of turns of the second armature winding 12, since the impedance is as low as in the first state, a sufficient current can flow even in a high frequency region, and the three-phase AC motor 2 is driven at high speed. It becomes a suitable state to do.

  When realizing the fourth state in the Y connection, the first switch S1 is turned on, the second switch S2 is turned off, the third to fourth switches S3 to S4 are turned on, and the fifth to sixth switches S5 are turned on. ~ S6 is turned OFF. As a result, both the first armature winding 11 and the second armature winding 12 Y-connected are switched to the fourth state in which the inverter 1 is connected in parallel. At this time, although depending on the number of turns of the armature windings 11 and 12, since the impedance is as low as that in the first state, a sufficient current can flow even in the high frequency region, and the three-phase AC motor 2 can be operated at high speed. It is in a state suitable for driving.

  Further, when realizing the first state in the delta connection, the first to fifth switches S1 to S5 are turned off and only the sixth switch S6 is turned on. As a result, only the first armature winding 11 that is delta-connected is switched to the first state in which the inverter 1 is connected. At this time, since the impedance is low, a sufficient current can flow even in the high frequency region, and a state suitable for driving the three-phase AC motor 2 at high speed is obtained.

  When realizing the second state in the delta connection, the first switch S1 is turned off, the second switch S2 is turned on, the third to fourth switches S3 to S4 are turned off, and the fifth switch S5 is turned on. And the sixth switch S6 is turned OFF. As a result, the first armature winding 11 and the second armature winding 12 are connected in series, and the entirety thereof becomes a delta connection and is switched to the second state where it is connected to the inverter 1. At this time, since the impedance is high, a sufficient voltage can be applied even in a low frequency region, and a large torque can be generated in the three-phase AC motor 2 with respect to the same current, which is suitable for low-speed driving. Become.

  When realizing the third state in the delta connection, the first and second switches S1 and S2 are turned off, the third switch S3 is turned on, the fourth switch S4 is turned off, and the fifth switch S5 is turned on. And the sixth switch S6 is turned OFF. As a result, only the second armature winding 12 that is delta-connected is switched to the third state in which the inverter 1 is connected. In this case, although depending on the number of turns of the second armature winding 12, since the impedance is as low as in the first state, a sufficient current can flow even in a high frequency region, and the three-phase AC motor 2 is driven at high speed. It becomes a suitable state to do.

  When realizing the fourth state in the delta connection, the first and second switches S1 and S2 are turned off, the third switch S3 is turned on, the fourth switch S4 is turned off, and the fifth to sixth switches S5. ~ S6 is turned ON. As a result, both the first armature winding 11 and the second armature winding 12 respectively connected in delta connection are switched to the fourth state in which the inverter 1 is connected in parallel. At this time, although depending on the number of turns of the armature windings 11 and 12, since the impedance is as low as that in the first state, a sufficient current can flow even in the high frequency region, and the three-phase AC motor 2 can be operated at high speed. It is in a state suitable for driving.

  When an abnormality is detected from the sensor 4, the switching control device 5 turns on only the first switch S1 and the second switch S2 of the winding switching device 3, and the other third to sixth switches S3 to S6. Is switched to the emergency state where the voltage applied to each of the two armature windings 11 and 12 can be minimized. At this time, the detection signal output from the sensor 4 that has detected an abnormality constitutes an emergency switching control signal, and all the first to sixth switches S1 to S6 constitute a path switching means.

  As described above, in the present embodiment, the switches S1 to S6 having the connection configuration as described above are provided to switch between the first state suitable for high speed driving and the second state suitable for low speed driving. I do. At this time, the electrical continuity between the first armature winding 11 and the second armature winding 12 can be instantaneously switched by the switches S1 to S6 formed of insulated gate bipolar transistor elements. . As a result, for example, electrical shock such as chattering that occurs in the case of mechanical switch means can be eliminated, and mechanical shock can be prevented by suppressing torque loss and braking torque generated when the switching period is long.

  The switches S1 to S6 have the following effects. That is, as described above, a semiconductor module formed by integrating six insulated gate bipolar transistor elements is highly versatile, and a semiconductor package in which one or a plurality of such semiconductor modules are already incorporated is widely used. Manufactured and distributed. In the present embodiment, among the switches S1 to S6, at least two switches (switches S1 and S2 in the example of FIG. 3, switches S1 and S6 in the example of FIG. 4, switches S2 and S3 in the example of FIG. The switches S3 and S5 in the example, the switches S3 and S6 in the example of FIG. 7, the switches S5 and S6 in the example of FIG. 8, the switches S4 and S5 in the example of FIG. 9, and the switches S2 and S6 in the example of FIG. The six IGBT elements 15A to 15F are integrated as one semiconductor module using such a highly versatile semiconductor module. As a result, the wiring can be simplified and widely applied to circuit designs having various configurations, and the assembly process can be simplified. Further, the winding switching device 3 can be reduced in size by reducing the installation area of the switch. As a result, the productivity of the winding switching device 3 can be improved and the manufacturing cost can be reduced.

  Moreover, since each switch S1-S6 is comprised by the IGBT element which uses SiC and GaN, there exists an effect that conduction loss can be reduced to the limit. In addition, since the IGBT element using SiC and GaN can operate in a high temperature environment as described above, the winding switching device 3 including the IGBT element is disposed in close proximity to or integrated with the three-phase AC motor 2. That is, the entire AC motor drive system 100 can be reduced in size. It goes without saying that other normally-configured IGBT elements may be used.

  Further, for example, when the winding switching device 3 is in the second state (low-speed compatible state) during the high-speed rotation of the three-phase AC motor 2, the voltage induced between the two armature windings 11 and 12 May exceed the breakdown voltage of the semiconductor switch element. As a countermeasure, in this embodiment, the switches S1 to S6 are connected to the first armature winding 11 and the detection signal from the sensor 4 corresponding to the abnormality detection state of the inverter 1 or the three-phase AC motor 2, in particular. A current path that minimizes the voltage applied to the second armature winding 12 is formed. That is, when an abnormality is detected from the sensor 4, that is, for example, a failure of a speed detector (not shown) such as a rotary encoder provided in the three-phase AC motor 2, a disconnection of various signal lines, or a speed calculator When an abnormality relating to speed detection, such as malfunctioning, is detected, it is regarded as an emergency, and the switching control device 5 sets each switch S1 to S6 of the winding switching device 3 to an ON / OFF state corresponding to the emergency. Switching (see FIG. 11 above). As a result, the voltage applied to each of the two armature windings 11 and 12 is minimized to protect each semiconductor switch element, in particular, the second switch S2 disposed between the two armature windings 11 and 12 from overvoltage. can do.

  At this time, particularly in the present embodiment, the first switch S1 and the second switch S2 form the current path that minimizes the voltage applied to the first armature winding 11 and the second armature winding 12. Thereby, each switch S1-S6 can be protected from an overvoltage with a simple structure, without providing the switch for exclusive use for an emergency separately.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and technical idea of the present invention. Hereinafter, such modifications will be described in order. In addition, about the part equivalent to the said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified suitably.

(1) When switching to the second state in each of the first state of the Y connection and the Y connection and the delta connection In the above embodiment, the Y state and the delta connection are switched to the first to fourth states. The present invention is not limited to this. For example, only the first state of the Y connection and the second state of each of the Y connection and the delta connection may be configured to be switchable.

  FIG. 12 is a diagram showing a circuit configuration of the winding switching device 3A and the three-phase AC motor 2A (in this example, the same configuration as that of the three-phase AC motor 2) in the first modified example. FIG. 3 is a diagram corresponding to FIG. 2.

  In FIG. 12, the winding switching device 3A connects the inverter output to the first input terminal 11a. The first output terminal 11b is connected to the first electrical neutral point 13 that short-circuits the wiring of each phase to one point via the first switch S1, and is also connected to the second input terminal 12a. The second output terminal 12b is connected to a second electrical neutral point 14 that short-circuits the wiring of each phase to one point via a fourth switch S4, and has a fifth switch S5 as a fifth switch means. Via the inverter 1. The first switch S1 in the present modification constitutes the first switch means described in each claim, the fourth switch S4 constitutes the fourth switch means, and the fifth switch S5 constitutes the fifth switch means.

  In the present modification, a combination of the fourth switch S4 and the fifth switch S5 shown in FIG. 9 and integrated as one semiconductor module 16G can be provided.

  FIG. 13 is a table showing the contents of the switching control performed by the switching control device 5 for each of the switches S1, S4, S5 of the winding switching device 3A in this modification.

  As described above, in this modification, the winding switching device 3A includes the first state in which the inverter output is guided only to the first armature winding 11 having the Y connection, the first armature winding 11 and the second armature. Two types of second states that lead the inverter output to both as a Y-connection or delta-connection as a whole in which the windings 12 are electrically connected in series, and when an abnormality is detected from the sensor 4, each armature winding 11, It is possible to selectively switch between the four states in an emergency in which the voltage applied to 12 is minimized.

  Specifically, as shown in the table of FIG. 13, when realizing the first state of the Y connection, the switching control device 5 turns on the first switch S1 of the winding switching device 3A, and the second to third. The switches S2 to S3 are turned off. Thereby, it is switched to the first state in which only the first armature winding 11 having the Y connection is connected to the inverter 1.

  When realizing the second state of the Y connection, the switching control device 5 turns off the first switch S2, turns on the fourth switch S4, and turns off the fifth switch S5. As a result, the first armature winding 11 and the second armature winding 12 connected in series constitute the Y connection and are switched to the second state where the first armature winding 11 and the second armature winding 12 are connected to the inverter 1.

  Further, when realizing the second state of the delta connection, the switching control device 5 turns off the first switch S1 and the fourth switch S4 and turns on the fifth switch S5. As a result, the first armature winding 11 and the second armature winding 12 connected in series constitute the delta connection and are switched to the second state where the first armature winding 11 and the second armature winding 12 are connected to the inverter 1.

  When an abnormality is detected from the sensor 4, the switching control device 5 turns on the first switch S1 of the winding switching device 3A and turns off the fourth switch S4 and the fifth switch S5. As a result, the state is switched to an emergency state in which the voltage applied to each of the two armature windings 11 and 12 can be minimized.

  As described above, this modification includes the switches S1, S4, S5 having the above-described connection configuration, and includes the inverter 1, the first electrical neutral point 13, and the second electrical neutral point 14. And connect. Thereby, the first state and the second state for the Y connection using the two armature windings 11 and 12 and the second state for the delta connection using the two armature windings 11 and 12 are switched. Can be realized with a simple wiring configuration.

(2) When switching to the first to fourth states only with the Y connection In the above embodiment, the Y connection and the delta connection are switched to the first to fourth states, but the present invention is not limited to this. For example, it may be configured to be switchable by limiting only to the first to fourth states of the Y connection.

  FIG. 14 is a diagram showing a circuit configuration of the winding switching device 3B and the three-phase AC motor 2B in the second modified example. In FIG. 14, the winding switching device 3B connects the inverter output to the first input terminal 11a. The first output terminal 11b is connected to the first electrical neutral point 13 that short-circuits the wiring of each phase to one point via the first switch S1, and is connected to the second input terminal 12a via the second switch S2. Has been. The second input terminal 12a is connected to the inverter 1 through the third switch S3. In this modification, with the exception described above, the second output terminal 12b of the second armature winding 12 is not connected to the winding switching device 3B, and the wiring of each phase is provided inside the three-phase AC motor 2B. Is connected to the second electrical neutral point 14 which is short-circuited to one point. The first switch S1 in this modification constitutes the first switch means described in each claim, the second switch S2 constitutes the second switch means, and the third switch S3 constitutes the third switch means.

  In this modification, the first switch S1 and the second switch S2 shown in FIG. 3 are combined and integrated as one semiconductor module 16A, or the second switch S2 and the second switch S2 shown in FIG. A combination of three switches S3 and integrated as one semiconductor module 16C can be provided.

  FIG. 15 is a table showing the contents of switching control performed by the switching control device 5 for each of the switches S1, S2, S3 of the winding switching device 3B in the present modification.

  As described above, in this modification, the winding switching device 3B can selectively switch between the first to fourth states in the Y connection and the five states in an emergency.

  Specifically, as shown in the table of FIG. 15, when realizing the first state, the switching control device 5 turns on the first switch S1 of the winding switching device 3B, and the second to third switches S2 to S2. S3 is turned OFF. Thereby, it is switched to the first state in which only the first armature winding 11 having the Y connection is connected to the inverter 1.

  When realizing the second state, the switching control device 5 turns off the first switch S1, turns on the second switch S2, and turns off the third switch S3. As a result, the first armature winding 11 and the second armature winding 12 connected in series constitute the Y connection and are switched to the second state where the first armature winding 11 and the second armature winding 12 are connected to the inverter 1.

  When realizing the third state, the switching control device 5 turns off the first and second switches S1 and S2 and turns on the third switch S3. Thereby, it is switched to the third state in which only the second armature winding 11 having the Y connection is connected to the inverter 1.

  When realizing the fourth state, the switching control device 5 turns on the first switch S1, turns off the second switch S2, and turns on the third switch S3. As a result, the first armature winding 11 and the second armature winding 12 each having a Y connection are connected in parallel, and both of them are switched to the fourth state.

  When an abnormality is detected from the sensor 4, the switching control device 5 turns on the first switch S1 of the winding switching device 3B, turns off the second switch S2, and turns on the third switch S3. Thus, the state can be switched to an emergency state in which the voltage applied to each of the two armature windings 11 and 12 can be minimized.

  As described above, in the present modification, each of the switches S1, S2, S3 having the connection configuration as described above is provided, and the inverter 1 and the first electrical neutral point 13 are connected. Thereby, switching of the said 1st-4th state with respect to Y connection using the two armature windings 11 and 12 is realizable with a simple wiring structure. When both the first armature winding 11 and the second armature winding 12 are housed in one housing to form one motor, the second electrical neutral point 14 is formed inside the housing. By being formed at the winding end portion of the second armature winding 12, there is an effect that the external wiring is omitted, the assembly of the three-phase AC motor 2B is facilitated, and the productivity is improved.

(3) When switching only the first state and the second state only with the Y connection In the second modified example, the configuration is switched to the first to fourth states only with the Y connection. It can also be configured to be switchable only in the second state.

  FIG. 16 is a diagram showing a circuit configuration of the winding switching device 3C and the three-phase AC motor 2C in the third modified example. In FIG. 16, the winding switching device 3C connects the inverter output to the first input terminal 11a. The first output terminal 11b is connected to the first electrical neutral point 13 that short-circuits the wiring of each phase to one point via the first switch S1, and is connected to the second input terminal 12a via the second switch S2. Has been. Also in this modification, with the exception described above, the second output terminal 12b of the second armature winding 12 is not connected to the winding switching device 3C, and the wiring of each phase is provided inside the three-phase AC motor 2C. Are connected to a second electrical neutral point 14 which is short-circuited to one point. The first switch S1 in the present modification constitutes the first switch means described in each claim, and the second switch S2 constitutes the second switch means.

  In the present modification, a combination of the first switch S1 and the second switch S2 shown in FIG. 3 and integrated as one semiconductor module 16A can be provided.

  FIG. 17 is a table showing the contents of the switching control performed by the switching control device 5 on the switches S1 and S2 of the winding switching device 3C in this modification.

  As described above, in this modification, the winding switching device 3C can selectively switch between the three states of the first state, the second state, and the emergency state in which the Y connection is established.

  Specifically, as shown in the table of FIG. 17, when realizing the first state, the switching control device 5 turns on the first switch S1 of the winding switching device 3C and turns off the second switch S2. To do. Thereby, it is switched to the first state in which only the first armature winding 11 having the Y connection is connected to the inverter 1.

  When realizing the second state, the switching control device 5 turns off the first switch S2 and turns on the second switch S2. As a result, the first armature winding 11 and the second armature winding 12 connected in series constitute the Y connection and are switched to the second state where the first armature winding 11 and the second armature winding 12 are connected to the inverter 1.

  When an abnormality is detected from the sensor 4, the switching control device 5 turns on the first switch S1 and turns off the second switch S2 of the winding switching device 3C, so that the two armature windings are turned on. 11 and 12 can be switched to an emergency state where the voltage applied to each of them can be minimized.

  As described above, in this modification, each switch S1, S2 having the above-described connection configuration is provided, and the inverter 1, the first electrical neutral point 13, and the second electrical neutral point 14 are connected. Connecting. Thus, switching between the first state and the second state for the Y connection using the two armature windings 11 and 12 can be realized with a simple wiring configuration.

  As shown in FIG. 17 above, the first switch S1 and the second switch S2 are in the opposite ON / OFF state in any of the first state, the second state, and the emergency, It can be seen that the first switch S1 and the second switch S2 are switched to the opposite ON / OFF states in accordance with the switching between the first state and the second state. Focusing on this point, the first switch S1 is composed of a normally-on type IGBT element, the second switch S2 is composed of a normally-off type IGBT element, and both switches are controlled to be switched by a common control line. It is good.

  In this case, in a normal state where a drive signal is not output on the common control line, the normally-on type first switch S1 is turned on and the normally-off type second switch S2 is turned off. Switch to the first state. In a non-normal state where a drive signal is output on the common control line, the normally-on type first switch S1 is turned off and the normally-off type second switch S2 is turned on. Switch to 2 state. Thereby, the wiring between the switching control device 5 and the winding switching device 3C can be omitted, and the configuration of the entire system can be simplified. On the contrary, the first switch S1 may be a normally-off type and the second switch S2 may be a normally-on type. In this case, switching between output / non-output of the drive signal on the common control line is reversed. The first state and the second state are switched.

(4) When switching to the first to fourth states only by the delta connection In the above embodiment, the Y-connection and the delta connection are switched to the first to fourth states, respectively, but the present invention is not limited to this. For example, it may be configured to be switchable by limiting only to the first to fourth states of the delta connection.

  FIG. 18 is a diagram showing a circuit configuration of the winding switching device 3D and the three-phase AC motor 2D (in this example, the same configuration as that of the three-phase AC motor 2) in the fourth modified example. In FIG. 18, the winding switching device 3D connects the inverter output to the first input terminal 11a. The first output terminal 11b is connected to the second input terminal 12a via the second switch S2. The second input terminal 12a is connected to the inverter 1 through the third switch S3. The second output terminal 12b is connected to the inverter 1 via the fifth switch S5. The first output terminal 11b is connected to the inverter 1 via the sixth switch S6. The second switch S2 in this modification constitutes the second switch means described in each claim, the third switch S3 constitutes the third switch means, the fifth switch S5 constitutes the seventh switch means, The sixth switch S6 constitutes sixth switch means.

  In this modification, the second switch S2 and the sixth switch S6 shown in FIG. 10 are combined and integrated as one semiconductor module 16H, or the second switch S2 shown in FIG. And the third switch S3 are combined and integrated as one semiconductor module 16C, or the third switch S3 and the sixth switch S6 are combined and integrated as one semiconductor module 16E shown in FIG. The third switch S3 and the fifth switch S5 shown in FIG. 6 are combined and integrated as one semiconductor module 16D, and the fifth switch S5 and the sixth switch S6 shown in FIG. What is integrated as a single semiconductor module 16F can be provided.

  FIG. 19 is a table showing the contents of the switching control performed by the switching control device 5 for each of the switches S2, S3, S5, S6 of the winding switching device 3D in this modification.

  As described above, in this modification, the winding switching device 3D can selectively switch between the first to fourth states in the delta connection and the five states in an emergency.

  Specifically, as shown in the table of FIG. 19, when realizing the first state, the switching control device 5 turns off the second, third, and fifth switches S2, S3, and S5 of the winding switching device 3D. The sixth switch S6 is turned on. Thereby, it is switched to the first state in which only the first armature winding 11 having the delta connection is connected to the inverter 1.

  When realizing the second state, the switching control device 5 turns on the second switch S2, turns off the third switch S3, turns on the fifth switch S5, and turns off the sixth switch S6. As a result, the first armature winding 11 and the second armature winding 12 connected in series constitute the delta connection and are switched to the second state where the first armature winding 11 and the second armature winding 12 are connected to the inverter 1.

  When realizing the third state, the switching control device 5 turns off the second switch S2, turns on the third and fifth switches S3 and S5, and turns off the sixth switch S6. Thereby, it is switched to the third state in which only the second armature winding 11 having the delta connection is connected to the inverter 1.

  When realizing the fourth state, the switching control device 5 turns off the second switch S2, and turns on the third, fifth, and sixth switches S3, S5, and S6. As a result, the first armature winding 11 and the second armature winding 12 each having a delta connection are connected in parallel and switched to the fourth state in which both are connected to the inverter 1.

  If an abnormality is detected from the sensor 4, the switching control device 5 turns off only the second switch S2 of the winding switching device 3D, and turns on the other third, fifth, sixth switches S3, S5, S6. By doing so, it is possible to switch to an emergency state in which the voltage applied to each of the two armature windings 11 and 12 can be minimized.

  As described above, in this modification, each switch S2, S3, S5, S6 having the connection configuration as described above is provided and connected to the inverter 1. Thereby, the switching of the said 1st-4th state with respect to the delta connection which uses the two armature windings 11 and 12 is realizable with a simple wiring structure.

(5) When only the first state and the second state are switched only by the delta connection In the fourth modified example, the configuration is switched to the first to fourth states only by the delta connection. It can also be configured to be switchable only in two states.

  FIG. 20 is a diagram showing a circuit configuration of the winding switching device 3E and the three-phase AC motor 2E (in this example, the same configuration as the three-phase AC motor 2) in the fifth modified example. In FIG. 20, the winding switching device 3E connects the inverter output to the first input terminal 11a. The first output terminal 11b is connected to the second input terminal 12a via the second switch S2, and is connected to the inverter 1 via the sixth switch S6. The second output terminal 12b is connected to the inverter 1 via the fifth switch S5. In this modification, the second switch S2 constitutes the second switch means described in each claim, the fifth switch S5 constitutes the seventh switch means, and the sixth switch S6 constitutes the sixth switch means. ing.

  In this modification, the second switch S2 and the sixth switch S6 shown in FIG. 10 are combined and integrated as one semiconductor module 16H, or the fifth switch S5 shown in FIG. And the sixth switch S6 can be combined and integrated as one semiconductor module 16F.

  FIG. 21 is a table showing the contents of the switching control performed by the switching control device 5 for each switch S2, S5, S6 of the winding switching device 3E in this modification.

  As described above, in the present modification, the winding switching device 3E can selectively switch only to the two states of the first state and the second state that are delta connection.

  Specifically, as shown in the table of FIG. 21, when the first state is realized, the switching control device 5 turns off the second and fifth switches S2 and S5 of the winding switching device 3E, and the sixth switch S6 is turned ON. Thereby, it is switched to the first state in which only the first armature winding 11 having the delta connection is connected to the inverter 1.

  When realizing the second state, the switching control device 5 turns on the second and fifth switches S2 and S5 and turns off the sixth switch S6. As a result, the first armature winding 11 and the second armature winding 12 connected in series constitute a delta connection and are switched to the second state where they are connected to the inverter 1.

  If an abnormality is detected from the sensor 4, the switching control device 5 turns off the second and fifth switches S2 and S5 of the winding switching device 3E, and turns on only the sixth switch S6, so that 2 The state is switched to an emergency state in which the voltage applied to each of the two armature windings 11 and 12 can be minimized.

  As described above, in this modification, the switches S2, S5, S6 having the above-described connection configuration are provided and connected to the inverter 1. Thereby, the switching between the first state and the second state with respect to the delta connection using the two armature windings 11 and 12 can be realized with a simple wiring configuration.

(6) When switching only Y connection and delta connection In the said embodiment, it was set as the structure switched to a 1st-4th state by each of Y connection and delta connection, but this invention is not limited to this. For example, it may be configured to perform only switching between Y connection and delta connection without changing the number of armature windings to be used.

  FIG. 22 is a diagram illustrating a circuit configuration of the winding switching device 3F and the three-phase AC motor 2F in the sixth modification. In FIG. 22, the winding switching device 3F connects the inverter output to the first input terminal 11a. The second output terminal 12b is connected to the second electrical neutral point 14 that short-circuits the wiring of each phase to one point via the fourth switch S4, and is connected to the inverter 1 via the fifth switch S5. ing. In the present modification, with the exception described above, the first output terminal 11b of the first armature winding 12 and the second input terminal 12a of the second armature winding 12 are respectively connected to the winding switching device 3F. They are not connected, but are directly connected to each other while corresponding to the wiring of each phase inside the three-phase AC motor 2F.

  In the present modification, a combination of the fourth switch S4 and the fifth switch S5 shown in FIG. 9 and integrated as one semiconductor module 16G can be provided.

  FIG. 23 is a table showing the contents of the switching control performed by the switching control device 5 for each switch S4, S5 of the winding switching device 3F in this modification.

  As described above, in this modification, the winding switching device 3F can selectively switch between the three states of Y connection, delta connection, and emergency without changing the number of armature windings to be used.

  Specifically, as shown in the table of FIG. 23, for example, the switching control device 5 turns on the fourth switch S4 of the winding switching device 3F and turns off the fifth switch S5. As a result, the entire first armature winding 11 and second armature winding 12 connected in series constitute a Y connection and are switched to a state (corresponding to the second state) connected to the inverter 1.

  Further, the switching control device 5 turns off the fourth switch S4 and turns on the fifth switch S5. As a result, the first armature winding 11 and the second armature winding 12 connected in series constitute a delta connection and are switched to a state (corresponding to the second state) connected to the inverter 1.

  When an abnormality is detected from the sensor 4, the switching control device 5 turns off the fourth switch S4 of the winding switching device 3F, and turns on the fifth switch S5, so that the two armature windings 11 and 12 can be switched to an emergency state where the voltage applied to each of them can be minimized.

  As described above, in the present modification, the switches S4 and S5 having the connection configuration as described above are provided, and the inverter 1 and the second electrical neutral point 14 are connected, so that two armatures are always provided. Switching between Y connection and delta connection using the windings 11 and 12 can be realized with a simple wiring configuration. In the case of this modification, the two armature windings 11 and 12 may be substantially constituted by one armature winding. In that case, the armature windings 11 and 12 may be compared with the above embodiment and the above modification. Thus, the assembly is easy with few external wirings, and the three-phase AC motor 2F with high productivity is obtained.

(7) Others In the above, any of the switches S1 to S6 and the like also serves as the path switching means, but is not limited thereto. That is, a path switching unit separate from the switches S1 to S6 and the like may be provided to form a current path that minimizes the voltage applied to the plurality of armature windings.

  In the above description, the AC motor drive system that drives and controls the three-phase AC motors 2 and 2A to 2F has been described as an example, but the present invention is not limited thereto. That is, a system that drives and controls a multiphase AC motor having four or more phases may be used. In this case, the same effect can be obtained. Moreover, you may apply to the alternating current motor provided with the 3 or more armature winding, and the same effect can be acquired also in that case.

  Moreover, each switch S1-S6 etc. should just be comprised with the semiconductor switch element at least, and semiconductor switch elements other than the said IGBT element 15 may be sufficient. Also in this case, the original effect of smoothly switching between the two armature windings can be obtained while preventing the functional adverse effect on each armature winding.

  In the above description, the AC motor drive system that drives and controls an AC motor including two armature windings has been described as an example, but the present invention is not limited thereto. In addition, the present invention may be applied to an AC motor including three or more armature windings, and in this case, the same effect can be obtained.

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination.

  In addition, although not illustrated one by one, the present invention is implemented with various modifications within a range not departing from the gist thereof.

1 Inverter 2 3-phase AC motor (AC motor)
2A, 2B 3-phase AC motor (AC motor)
DESCRIPTION OF SYMBOLS 3 Winding switching apparatus 3A-3F Winding switching apparatus 4 Sensor 5 Switching control apparatus 11 1st armature winding 11a 1st input terminal (1st winding input terminal)
11b First output terminal (first winding output terminal)
12 Second armature winding 12a Second input terminal (second winding input terminal)
12b Second output terminal (second winding output terminal)
13 1st electrical neutral point 14 2nd electrical neutral point 15A-15F IGBT element 16A-16H Semiconductor module 100 AC motor drive system S1 1st switch (semiconductor switch means, path | route switching means)
S2 Second switch (semiconductor switch means, path switching means)
S3 Third switch (semiconductor switch means, path switching means)
S4 Fourth switch (semiconductor switch means, path switching means)
S5 5th switch (semiconductor switch means, path switching means)
S6 6th switch (semiconductor switch means, path switching means)
SW switch element

Claims (12)

A winding switching device for a three-phase AC motor that performs winding switching related to a three-phase first armature winding and a second armature winding provided in an AC motor fed by an inverter,
A first state in which power supplied from the inverter is guided to the first armature winding of the first armature winding and the second armature winding, and the first armature winding and the second armature winding. A semiconductor switch means capable of switching between a second state for guiding the power supplied from the inverter to both of the lines;
The semiconductor switch means includes
Two switch elements composed of three insulated gate bipolar transistor elements corresponding to the three phases are provided, and six insulated gate bipolar transistor elements included in the two sets of switch elements are integrated. A winding switching device for a three-phase AC motor, comprising at least one semiconductor module. In the winding switching device for a three-phase AC motor according to claim 1,
The semiconductor switch means includes
The first electrical neutral point corresponding to the first state and the first armature winding are connected in the first state, and the first electrical neutral point and the first in the second state. First switch means for interrupting the armature winding;
The first armature winding and the second armature winding are connected in series in the second state, and the first armature winding and the second armature winding are connected in the first state. A second switch means for shutting off;
With
The second armature winding is:
A second winding output terminal opposite to the side connected to the second switch means is connected to a second electrical neutral point corresponding to the second state;
The semiconductor module is
Three insulated gate bipolar transistor elements of the switch element provided in the first switch means and three insulated gate bipolar transistor elements of the switch element provided in the second switch means are integrated. A winding switching device for a three-phase AC motor, which is provided. In the winding switching device for a three-phase AC motor according to claim 2,
The semiconductor switch means includes
Further, a third state in which power supplied from the inverter is guided to the second armature winding of the first armature winding and the second armature winding, and the first armature winding and the second armature winding. A second state in which power supplied from the inverter is guided to both of the two armature windings, and is switchable;
In the third state and the fourth state, a second winding input terminal connected to the second switch means of the second armature winding is connected to the inverter, and the first state and the second state A third switch means for shutting off the second winding input terminal and the inverter in two states;
The first switch means shuts off the first electrical neutral point and the first armature winding in the third state, and the first electrical neutral point and the first arm in the fourth state. Connect 1 armature winding,
The second switch means cuts off the first armature winding and the second armature winding in the third state and the fourth state,
The semiconductor module is
A combination of three insulated gate bipolar transistor elements of the switch element provided in the first switch means and three insulated gate bipolar transistor elements of the switch element provided in the second switch means;
Or
A combination of three insulated gate bipolar transistor elements of the switch element provided in the second switch means and three insulated gate bipolar transistor elements of the switch element provided in the third switch means;
A winding switching device for a three-phase AC motor, characterized in that any combination of the above is integrally provided. In the winding switching device for a three-phase AC motor according to claim 1,
The first armature winding and the second armature winding are connected in series,
The semiconductor switch means includes
The first electrical neutral point corresponding to the first state and the first armature winding are connected in the first state, and the first electrical neutral point and the first in the second state. First switch means for interrupting the armature winding;
In the second state and the Y connection, the second electrical neutral point corresponding to the second state and the second armature winding are connected, and in the first state or the second state And a fourth switch means for cutting off the second electrical neutral point and the second armature winding in the case of delta connection;
In the case of the second state and the delta connection, the first armature winding and the second armature winding connected in series form both the first armature winding and the second armature winding to form the delta connection. In the case where the second winding output terminal opposite to the side connected to the first armature winding and the inverter are connected, and the second state in the first state or the second state and the Y connection is used. A fifth switch means for shutting off the second winding output terminal of the armature winding and the inverter;
With
The semiconductor module is
The three insulated gate bipolar transistor elements of the switch element provided in the fourth switch means and the three insulated gate bipolar transistor elements of the switch element provided in the fifth switch means are integrated. A winding switching device for a three-phase AC motor, which is provided. In the winding switching device for a three-phase AC motor according to claim 1,
The semiconductor switch means includes
The first armature winding and the second armature winding are connected in series in the second state, and the first armature winding and the second armature winding are connected in the first state. A second switch means for shutting off;
Connect the first winding output terminal on the opposite side of the first armature winding to the inverter so as to form a delta connection with the first armature winding in the first state. And a sixth switch means for cutting off the first winding output terminal of the first armature winding and the inverter in the second state;
The second armature winding of the second armature winding in the first state is disconnected from the second winding output terminal opposite to the side connected to the second switch means and the inverter, and is connected in series in the second state. A seventh switch for connecting the second winding output terminal of the second armature winding and the inverter so as to form a delta connection between the first armature winding and the second armature winding; Means, and
The semiconductor module is
A combination of three insulated gate bipolar transistor elements of the switch element provided in the second switch means and three insulated gate bipolar transistor elements of the switch element provided in the sixth switch means;
Or
A combination of three insulated gate bipolar transistor elements of the switch element provided in the seventh switch means and three insulated gate bipolar transistor elements of the switch element provided in the sixth switch means;
A winding switching device for a three-phase AC motor, characterized in that any combination of the above is integrally provided. In the winding switching device for a three-phase AC motor according to claim 5,
The semiconductor switch means includes
Further, a third state in which power supplied from the inverter is guided to the second armature winding of the first armature winding and the second armature winding, and the first armature winding and the second armature winding. A fourth state in which power supplied from the inverter is guided in parallel to both of the two armature windings, and is switchable;
In the third state and the fourth state, a second winding input terminal connected to the second switch means of the second armature winding is connected to the inverter, and the first state and the second state A third switch means for shutting off the second winding input terminal and the inverter in two states;
The second switch means interrupts the first armature winding and the second armature winding in both the third state and the fourth state,
The sixth switch means shuts off the first winding output terminal of the first armature winding and the inverter in the third state, and a delta connection at the first armature winding in the fourth state. Connecting the first winding output terminal of the first armature winding to the inverter so as to constitute
The seventh switch means includes the second winding output terminal of the second armature winding so that the second armature winding forms a delta connection in both the third state and the fourth state. Connected to the inverter,
The semiconductor module is
A combination of three insulated gate bipolar transistor elements of the switch element provided in the second switch means and three insulated gate bipolar transistor elements of the switch element provided in the sixth switch means;
A combination of three insulated gate bipolar transistor elements of the switch element provided in the second switch means and three insulated gate bipolar transistor elements of the switch element provided in the third switch means;
A combination of three insulated gate bipolar transistor elements of the switch element provided in the third switch means and three insulated gate bipolar transistor elements of the switch element provided in the sixth switch means;
A combination of three insulated gate bipolar transistor elements of the switch element provided in the third switch means and three insulated gate bipolar transistor elements of the switch element provided in the seventh switch means;
as well as,
A combination of three insulated gate bipolar transistor elements of the switch element provided in the seventh switch means and three insulated gate bipolar transistor elements of the switch element provided in the sixth switch means;
Among them, at least one combination is integrally provided, and a winding switching device for a three-phase AC motor. In the winding switching device for a three-phase AC motor according to claim 1,
The semiconductor switch means includes
Further, a third state in which power supplied from the inverter is guided to the second armature winding of the first armature winding and the second armature winding, and the first armature winding and the second armature winding. A fourth state in which power supplied from the inverter is guided in parallel to both of the two armature windings, and is switchable;
In the first state and the fourth state and in the Y connection, the first electrical neutral point corresponding to the first state and the first armature winding are connected, and the second state and An eighth switch means for shutting off the first electrical neutral point and the first armature winding in the third state or the first state and the fourth state and in a delta connection;
The first armature winding and the second armature winding are connected in series in the second state, and the first armature winding in the first state, the third state, and the fourth state. A ninth switch means for interrupting the wire and the second armature winding;
In the third state and the fourth state, a second winding input terminal connected to the second switch means of the second armature winding is connected to the inverter, and the first state and the second state Third switch means for shutting off the second winding input terminal and the inverter in two states;
In the second state, the third state, and the fourth state and in the Y-connection, the second electrical neutral point corresponding to the second state and the second armature winding are connected. Cutting off the second electrical neutral point and the second armature winding in the first state or the second state, the third state, and the fourth state and in the case of a delta connection; Ninth switch means;
When the delta connection is made in the second state, the third state, and the fourth state, both the first armature winding and the second armature winding connected in series form a delta connection. Connecting the second winding output terminal on the opposite side of the second armature winding to the side connected to the first armature winding and the inverter, and the first state or the second state, A tenth switch means for shutting off the second winding output terminal of the second armature winding and the inverter in the third state, the fourth state, and the Y connection;
A first winding output terminal on the opposite side to the side connected to the inverter of the first armature winding so as to form a delta connection with the first armature winding in the first state and the fourth state An eleventh switch means for cutting off the first winding output terminal of the first armature winding and the inverter in the second state and the third state;
With
The semiconductor module is
A combination of three insulated gate bipolar transistor elements of the switch element provided in the eighth switch means and three insulated gate bipolar transistor elements of the switch element provided in the ninth switch means;
A combination of three insulated gate bipolar transistor elements of the switch element provided in the eighth switch means and three insulated gate bipolar transistor elements of the switch element provided in the twelfth switch means;
A combination of three insulated gate bipolar transistor elements of the switch element provided in the ninth switch means and three insulated gate bipolar transistor elements of the switch element provided in the third switch means;
A combination of three insulated gate bipolar transistor elements of the switch element provided in the ninth switch means and three insulated gate bipolar transistor elements of the switch element provided in the twelfth switch means;
A combination of three insulated gate bipolar transistor elements of the switch element provided in the third switch means and three insulated gate bipolar transistor elements of the switch element provided in the eleventh switch means;
A combination of three insulated gate bipolar transistor elements of the switch element provided in the third switch means and three insulated gate bipolar transistor elements of the switch element provided in the twelfth switch means;
A combination of three insulated gate bipolar transistor elements of the switch element provided in the eleventh switch means and three insulated gate bipolar transistor elements of the switch element provided in the twelfth switch means;
as well as,
A combination of three insulated gate bipolar transistor elements of the switch element provided in the tenth switch means and three insulated gate bipolar transistor elements of the switch element provided in the eleventh switch means;
Among them, at least one combination is integrally provided, and a winding switching device for a three-phase AC motor. In the winding switching device for a three-phase AC motor according to any one of claims 2 to 7,
The semiconductor module is
The switch element comprising three insulated gate bipolar transistor elements that are normally-on type switches;
A winding switching device for a three-phase AC motor, comprising: the switch element comprising three insulated gate bipolar transistor elements which are normally-off type switches. In the winding switching device for a three-phase AC motor according to any one of claims 2 to 8,
A plurality of coils including the first armature winding and the second armature winding in response to an emergency switching control signal from the outside of the winding switching device corresponding to an abnormality detection state of the inverter or the AC motor. A winding switching device for a three-phase AC motor, comprising path switching means for forming a current path that minimizes the voltage applied to the armature winding. In the winding switching device for a three-phase AC motor according to claim 9,
The route switching means is
A winding switching device for a three-phase AC motor, which also serves as the switch element. An AC motor drive system comprising the AC motor winding switching device according to any one of claims 1 to 10,
The AC motor is
Comprising a plurality of armature windings with the same number of turns in each phase;
The winding switching device is
The plurality of electric coil windings can be switched to at least three winding states by appropriately combining conduction and blocking of a plurality of semiconductor switch elements,
And,
An AC motor drive system comprising an inverter that drives the AC motor and a switching control device that performs switching control of the winding switching device. In the AC motor drive system according to claim 11,
A sensor for detecting various abnormalities in the entire AC motor drive system or an application including the AC motor drive system;
The AC motor drive system, wherein the switching control device switches and controls the winding switching device based on a detection signal of the sensor.

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