JP2008061379A - Reluctance motor control method - Google Patents

Abstract

An object of the present invention is to reduce magnetic saturation and thereby increase reluctance torque.
A reluctance motor includes a rotor and a stator. The rotor 11 is a magnetic body that can rotate around a predetermined shaft 91 and has a plurality of portions 111 that protrude only on the outer peripheral side of the rotor 11. The stator 12 has first to sixth windings and is provided to face the rotor 11 from the outer peripheral side. A first phase current is passed through the first and second windings. A second phase current is passed through the third and fourth windings. A third phase current is passed through the fifth and sixth windings. The first, third, and fifth windings are arranged adjacent to each other along the circumferential direction 92 around the predetermined axis 91 in this order, and start from one end in the clockwise direction when viewed from the inner circumferential side. It is wound. The second, fourth, and sixth windings are arranged adjacently along the circumferential direction 92 in this order, and are wound in a direction opposite to the clockwise direction when viewed from the inner circumferential side with one end as a starting point.
[Selection] Figure 1

Description

  The present invention relates to a reluctance motor and a control method thereof.

  A reluctance motor that is driven by passing a three-phase current has been proposed as a motor that can obtain a large torque at a low current and is easy to be miniaturized.

  The reluctance motor includes a stator having a plurality of windings through which currents of respective phases flow, and a rotor provided to face the stator. The rotor rotates by executing control (one-phase excitation) in which the current of each phase is switched in order in the stator. However, with such control, it has been difficult to increase the reluctance torque generated in the reluctance motor.

  Therefore, it has been proposed to employ control (two-phase excitation) in which two-phase currents of three-phase currents are caused to flow in parallel.

  In addition, the technique relevant to this invention is shown below.

Japanese Patent Application Laid-Open No. 2000-295891 JP 2001-157490 A

  However, when two-phase excitation is performed, a magnetic flux flows between adjacent windings, which may easily cause magnetic saturation. When magnetic saturation occurs, it becomes difficult to increase the reluctance torque.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to reduce magnetic saturation and thereby increase reluctance torque.

  The reluctance motor according to the first aspect of the present invention is capable of rotating about a predetermined axis (91), and has a plurality of portions (111) protruding only on either the outer peripheral side or the inner peripheral side thereof. A magnetic rotor (11) having first and second windings (1211, 1212) through which a first phase current (V) of a three-phase current flows, and a second phase of the three-phase current Third and fourth windings (1221, 1222) through which a current (W) flows, and fifth and sixth windings (1231, 1232) through which a third phase current (U) of the three-phase current flows, And the stator (12) provided to face the rotor from the one side, and the first, third and fifth windings are arranged in this order on the predetermined axis. It is arranged adjacent to each other along the circumferential direction (92), and both ends (1211a, 121 b, 1221a, 1221b, 1231a, 1231b), and is wound in a clockwise direction as viewed from the one side starting from one end (1211a, 1221a, 1231a) on the high potential side of the both ends, The second, fourth and sixth windings are arranged adjacent to each other along the circumferential direction (92) around the predetermined axis in this order, and both ends (1212a, 1212b, 1222a, 1222b, 1232a) are arranged. , 1232b), and one end (1212a, 1222a, 1232a) on the high potential side of the both ends is used as a starting point and is wound in a direction opposite to the clockwise direction when viewed from the one side.

  A reluctance motor according to a second aspect of the present invention is the reluctance motor according to the first aspect, wherein the reluctance motor is connected to a pair of input terminals (241, 242) and one of the pair of input terminals (241). 1st to 3rd output terminals (211 to 231), 4th to 6th output terminals (212 to 232) connected to the other (242) of the pair of input terminals, and 1st to 3rd A control unit (2) having a switch (S1, S3, S5) is further provided, and the one end (1211a, 1212a) of the first and second windings (1211, 1212) is the first one. The other end (1211b, 1212b) is connected to the fourth output terminal side on one output terminal side, and the one end of each of the third and fourth windings (1221, 1222) is also connected to the one end. 1221a and 1222a) are connected to the second output terminal side, and the other ends (1221b and 1222b) are connected to the fifth output terminal side, respectively, and the fifth and sixth windings (1231 and 1232) are connected. In either case, the one end (1231a, 1232a) is connected to the third output terminal side, the other end (1231b, 1232b) is connected to the sixth output terminal side, and the first switch is connected to the input terminal. Between the terminals, the first and second windings are connected in series, and the second switch is connected between the input terminals and the third and fourth windings in series. The third switch is connected in series with any of the fifth and sixth windings between the input terminals.

  The reluctance motor according to claim 3 of the present invention is capable of rotating about a predetermined axis (91), and has a plurality of portions (111) protruding only on one of the outer peripheral side and the inner peripheral side thereof. A magnetic rotor (11), a plurality of first windings (1211, 1212) through which the first phase current (V) of the three-phase current flows, and the second of the three-phase currents A plurality of second windings (1221, 1222) through which a phase current (W) flows, and a plurality of third windings (1231, 1232) through which a third phase current (U) of the three-phase currents flows. A stator (12) provided opposite to the rotor from the one side, and a controller (21), wherein the first to third windings are arranged in this order, The controller is repeatedly arranged along a circumferential direction (92) around a predetermined axis. Input terminals (241, 242), first to third output terminals (211 to 231) connected to one of the pair of input terminals (241), and the other of the pair of input terminals (242) And a control unit (2) having fourth to sixth output terminals (212 to 232) connected to the first and sixth switches (S1, S3, S5, S7, S8, S4). The first winding has both ends (1211a, 1211b, 1212a, 1212b), one end (1211a, 1212a) is on the first output terminal side, and the other end (1211b, 1212b) is on the first. 4 are respectively connected to the output terminal side, and the second winding has both ends (1221a, 1221b, 1222a, 1222b), and one end (1221a, 1222a) is connected to the second output terminal side and the other. (1221b, 1222b) are respectively connected to the fifth output terminal side, the third winding has both ends (1231a, 1231b, 1232a, 1232b), and one end (1231a, 1232a) is the third output terminal. The other end (1231b, 1232b) is connected to the sixth output terminal side, and the first switch is connected between the input terminals of the first and second windings. Both are connected in series, and the third switch is connected in series with any of the fifth and sixth windings between the input terminals, and the second and fourth switches (S3, S3). S7) is connected between each of the one (241) and the other (242) of the input terminals and the second output terminal (221), and the fifth and sixth switches (S8). , S4) is connected between the one and the other of the input terminals and the fifth output terminal (222).

  A reluctance motor control method according to a fourth aspect of the present invention is a method for controlling a reluctance motor according to any one of the first to third aspects, wherein the first phase is controlled. The first control (C1) for flowing only the current (V), the second control (C2) for flowing only the second phase current (W), and the second control (C2) for flowing only the third phase current (U) 3 control (C3), fourth control (C4) for flowing only the third and first phase currents, and fifth control (C5) for flowing only the first and second phase currents. And the sixth control (C6) for flowing only the second and third phase currents, the one having the maximum reluctance torque (T) generated by the control is the rotation angle (θ ) Is selected and executed every time.

  The reluctance motor control method according to claim 5 of the present invention is a portion (111) that can rotate about a predetermined axis (91) and protrudes only to one of its outer peripheral side and inner peripheral side. A plurality of magnetic rotors (11), a plurality of first windings (1211, 1212) through which the first phase current (V) of the three-phase currents flows, and the three-phase currents A plurality of second windings (1221, 1222) through which the second phase current (W) flows and a third winding (1231, 1232) through which the third phase current (U) of the three-phase current flows. And a stator (12) provided opposite to the rotor from the one side, wherein the first to third windings are arranged in this order on the predetermined axis. A reluctance motor (1, 1) that is repeatedly arranged around the circumferential direction (92) In contrast to 1), only any two of the three-phase currents are flowed, and the flow directions of the two phase currents when viewed from the one side are adjacent to each other in the circumferential direction. The windings are the same as each other.

  A reluctance motor control method according to a sixth aspect of the present invention is the reluctance motor control method according to the fifth aspect, wherein the first control (C1) flows only the first phase current (V); A second control (C2) for flowing only the second phase current (W), a third control (C3) for flowing only the third phase current (U), the third and the first A fourth control (C4) for flowing only the phase current, a fifth control (C5) for flowing only the first and second phase currents, and a second control (C4) for flowing only the second and third phase currents. Among the six controls (C6), the one having the maximum reluctance torque (T) generated by the control is selected and executed for each rotation angle (θ) of the rotor.

  According to the reluctance motor according to the first aspect of the present invention, when only one of the first and third phase currents and only the second phase current flow in parallel, the second winding, Magnetic flux does not flow between the first and third windings adjacent to each other. Magnetic flux does not flow between the fifth winding and the fourth and sixth windings adjacent to the fifth winding. The magnetic flux generated in the second winding flows to at least one of the fourth to sixth windings. Magnetic flux generated in the fifth winding flows to at least one of the first to third windings. Therefore, magnetic saturation is reduced, and thus the reluctance torque is increased.

  According to the reluctance motor according to claim 2 of the present invention, the DC power source is provided between the pair of input terminals, and the high potential side and the low potential side of the DC power source are respectively connected to one and the other of the input terminals. Thus, current can flow from one end to the other end of any of the first to sixth windings. Then, by controlling the switching of the first to third switches, only any two phase currents of the three-phase current can be allowed to flow in parallel (two-phase excitation). Furthermore, it is possible to execute only one of the three-phase currents (one-phase excitation) or switch between the one-phase excitation and the two-phase excitation.

  According to the reluctance motor according to claim 3 of the present invention, the second and fourth switches are controlled to be turned on, and the fifth and sixth switches are controlled to be turned off. Current flows from the second output terminal to the fifth output terminal. On the other hand, by controlling the second and fourth switches to be turned off and the fifth and sixth switches to be turned on, respectively, from the fifth output terminal to the second output terminal with respect to the second winding. Current flows. Therefore, when a current is supplied only to the first and second windings and a current is supplied only to the second and third windings, the current flowing through the adjacent windings in the circumferential direction is viewed from one side. The flow direction can be made the same. As a result, magnetic flux does not flow between adjacent windings in the circumferential direction, thereby reducing magnetic saturation and increasing reluctance torque.

  According to the control method of the reluctance motor according to claim 4 or claim 6 of the present invention, the fourth to sixth also in the rotation angle region where it is difficult to increase the reluctance torque by only the first to third controls. The reluctance torque can be increased by selectively executing the control. Therefore, the output of the reluctance motor is increased.

  According to the control method of the reluctance motor according to the fifth aspect of the present invention, since the current flows in the same direction in each of the adjacent windings, no magnetic flux flows between the adjacent windings. Magnetic flux generated in one of the adjacent windings flows to a winding in which a current flows in a direction different from that of the winding. Therefore, magnetic saturation is reduced, and thus the reluctance torque is increased.

First embodiment.
FIG. 1 conceptually shows a reluctance motor 1 according to the present embodiment. The reluctance motor 1 includes a rotor 11 and a stator 12.

  The rotor 11 is a magnetic body that can rotate around a predetermined axis 91 and has a plurality of portions 111 that protrude only on the outer peripheral side of the rotor 11. In FIG. 1, eight portions 111 are provided.

  The stator 12 includes first and second windings 1211 and 1212, third and fourth windings 1221 and 1222, and fifth and sixth windings 1231 and 1232, and the rotor 11 Is provided opposite to the outer peripheral side. In FIG. 1, two each of the first and second windings 1211, 1212, the third and fourth windings 1221, 1222, and the fifth and sixth windings 1231, 1232 are provided.

  A first phase current of a three-phase current flows through the first and second windings 1211 and 1212. A second phase current of a three-phase current flows through the third and fourth windings 1221, 1222. A third phase current of a three-phase current flows through the fifth and sixth windings 1231 and 1232. FIG. 1 shows a case where a V-phase current is adopted as the first phase current, a W-phase current is adopted as the second phase current, and a U-phase current is adopted as the third phase current.

  The first, third and fifth windings 1211, 1221 and 1231 are arranged adjacent to each other along the circumferential direction 92 around a predetermined axis 91 in this order. The first winding 1211 has both ends 1211a and 1211b, the third winding 1221 has both ends 1221a and 1221b, and the fifth winding 1231 has both ends 1231a and 1231b. The first, third, and fifth windings 1211, 1221, and 1231 are wound in the clockwise direction as viewed from the inner periphery, starting from one end 1211a, 1221a, and 1231a, respectively.

  The second, fourth, and sixth windings 1212, 1222, and 1232 are arranged adjacent to each other along the circumferential direction 92 in this order. The second winding 1212 has both ends 1212a and 1212b, the fourth winding 1222 has both ends 1222a and 1222b, and the sixth winding 1232 has both ends 1232a and 1232b. The second, fourth, and sixth windings 1212, 1222, and 1232 are wound in the opposite direction from the clockwise direction when viewed from the inner peripheral side, starting from one end 1212a, 1222a, and 1232a, respectively.

  As will be described later, the one ends 1211a, 1212a, 1221a, 1222a, 1231a, and 1232a are connected to the high potential side of the DC power supply V, respectively. That is, current flows through the first, third, and fifth windings 1211, 1221, and 1231 in the clockwise direction when viewed from the inner peripheral side. Therefore, in any of these windings 1211, 1221, and 1231, the magnetic flux flows from the inner peripheral side to the outer peripheral side.

  On the other hand, a current flows through the second, fourth, and sixth windings 1212, 1222, and 1232 in a direction opposite to the clockwise direction when viewed from the inner peripheral side. Therefore, in any of these windings 1212, 1222, and 1232, the magnetic flux flows from the outer peripheral side to the inner peripheral side.

  From the above, according to the reluctance motor 1, only one of the first and third phase currents (V-phase and U-phase currents) and the second phase current (W-phase current) flow in parallel. In this case, no magnetic flux flows between the second winding 1221 and the first and third windings 1211 and 1231 adjacent to the second winding 1221 along the circumferential direction 92. Further, no magnetic flux flows between the fifth winding and the fourth and sixth windings 1212 and 1232 adjacent to the fifth winding along the circumferential direction 92. The magnetic flux generated in the second winding 1221 flows to at least one of the fourth to sixth windings 1212, 1222, and 1232. Further, the magnetic flux generated in the fifth winding 1222 flows to at least one of the first to third windings 1211, 1221, 1231. Therefore, magnetic saturation is reduced, and thus the reluctance torque is increased.

  The rotor 11 may be a magnetic body having a plurality of portions 111 that protrude only on the inner peripheral side of the rotor 11. In this case, the stator 12 is provided facing the rotor 11 from the inner peripheral side.

  FIG. 2 shows changes in the reluctance torque T generated in the reluctance motor 1 with respect to the rotation angle θ using graphs 101 to 103. A graph 101 shows a case where the control C4 is performed in which only the first phase current (V-phase current) and the third phase current (U-phase current) are allowed to flow in parallel. The graph 102 shows a case where the control C5 in which only the first phase current (V-phase current) and the second phase current (W-phase current) are allowed to flow in parallel is executed. A graph 103 shows a case where the control C6 is performed in which only the second phase current (W-phase current) and the third phase current (U-phase current) are allowed to flow in parallel. The controls C4 to C6 are commonly called “two-phase excitation”.

  Here, the relationship between the rotation position of the rotor 11 and the rotation angle θ is as follows. When the rotation angle θ is 0 °, a certain portion 111 is a winding 1211, 1221 (1212, 1222) through which the first and second phase currents (V-phase and W-phase currents) flow, and the circumferential direction 92 Is located in the middle A1 of adjacent ones. When the rotation angle θ is 15 °, a certain portion 111 is the windings 1221 and 1231 (1222 and 1232) through which the second and third phase currents (W-phase and U-phase currents) flow, and the circumferential direction 92 In the middle A2. When the rotation angle θ is 30 °, a certain portion 111 is the windings 1231, 1211 (1232, 1212) through which the third and first phase currents (U-phase and V-phase currents) flow, and the circumferential direction 92 In the middle A3 of adjacent ones. The same applies to FIGS. 6 to 9 described later.

  The graph 101 has a period of 45 ° with respect to the rotation angle θ. This is because the portion 111 is positioned at the middle A1 every time the rotor 11 rotates 45 °. Similarly, the graphs 102 and 103 have a period of 45 ° with respect to the rotation angle θ.

  In the graph 101, the reluctance torque T becomes maximum when the rotation angle θ is an angle θ1 deviating from 0 ° in the direction opposite to the rotation direction. In the graph 102, the reluctance torque T is maximized when the rotation angle θ is an angle θ2 deviating from 15 ° in the direction opposite to the rotation direction. In the graph 103, the reluctance torque T becomes maximum when the rotation angle θ is an angle θ3 that is shifted from 30 ° in the direction opposite to the rotation direction.

  In FIG. 2, graphs 201 to 203 are also shown. Graphs 201 to 203 show that the third winding 1221 of the reluctance motor 1 shown in FIG. 1 is wound in the direction opposite to the clockwise direction when viewed from the inner periphery side, starting from one end 1221a. The case where 1222 performs control C4-C6 with respect to the reluctance motor 11 wound in the clockwise direction as viewed from the inner periphery side from one end 1222a is shown. The reluctance motor 11 is shown in FIG.

  Comparing the graph 102 and the graph 202, it can be seen that the reluctance torque T increases when the reluctance motor 1 executes the control C5 at least in the range of the rotation angle θ between the angles θ4 and θ5. In the reluctance motor 1, even if the control C5 is executed, the first winding 1211 and the third winding 1221 adjacent to each other in the circumferential direction 92 and the second winding 1212 and the fourth winding are arranged. This is because no magnetic flux flows between the wire 1222 and the magnetic resistance decreases. On the other hand, when the control C5 is executed by the reluctance motor 11, magnetic flux flows between the first and third windings 1211 and 1221 and between the second and fourth windings 1212 and 1222.

  By comparing the graph 103 and the graph 203, it can be seen that the reluctance torque T is increased at least in the range of the rotation angle θ between the angles θ6 to θ7 by executing the control C6 in the reluctance motor 1. This is because, even if the reluctance motor 1 executes the control C6, the third winding 1221 and the fifth winding 1231 adjacent to each other in the circumferential direction 92, and the fourth winding 1222 and the sixth winding. This is because no magnetic flux flows between the line 1232 and the magnetic resistance decreases. On the other hand, when the control C6 is executed by the reluctance motor 11, magnetic flux flows between the third and fifth windings 1221 and 1231 and between the fourth and sixth windings 1222 and 1232.

  Comparing the graph 101 and the graph 102, it can be seen that the two match. This is because even when the control C4 is executed by the reluctance motor 1, the flow of magnetic flux is the same as when the control C1 is executed by the reluctance motor 11. That is, when the control C4 is executed in any of the reluctance motors 1 and 11, between the first winding 1211 and the fifth winding 1231 adjacent in the circumferential direction 92, and between the second winding 1212 and the sixth winding Magnetic flux flows between the coil 1232 and the winding 1232.

  FIG. 4 conceptually shows the control unit 2 that controls the reluctance motor 1. The control unit 2 includes a pair of input terminals 241, 242, output terminals 211, 212, 221, 222, 231, 232, switches S1 to S6, and diodes Di1 to Di6. FIG. 4 also shows a DC power supply V that supplies power to the control unit 2.

  The switches S1, S3, and S5 are connected between the output terminals 211, 221, 231 and the input terminal 241 respectively. The switches S2, S4, S6 are connected between the output terminals 212, 222, 232 and the input terminal 242, respectively. FIG. 1 shows a case where a transistor is employed for each of the switches S1 to S6.

  Each of the diodes Di1, Di3, and Di5 has a cathode connected to the output terminals 211, 221, and 231 and an anode connected to the input terminal 242. The diodes Di2, Di4, and Di6 each have an anode connected to the output terminals 212, 222, and 232, and a cathode connected to the input terminal 241.

  For the control unit 2, the DC power source V, the first and second windings 1211, 1212, the third and fourth windings 1221, 1222, the fifth and sixth windings 1231, 1232 are as follows. So that they are connected.

  Regarding the DC power source V, the high potential side is connected to the input terminal 241 and the low potential side is connected to the input terminal 242.

  For the first and second windings 1211, 1212, one end 1211a, 1212a is connected to the output terminal 211 side, and the other end 1211b, 1212b is connected to the output terminal 212 side.

  FIG. 5 illustrates the connection relationship between the output terminals 211 and 212 of the first and second windings 1211 and 1212. The first windings 1211 and the second windings 1212 are connected in parallel between the output terminals 211 and 212, respectively. The first winding 1211 and the second winding 1212 are connected in series between the output terminals 211 and 212.

  For the third and fourth windings 1221, 1222, one end 1221a, 1222a is connected to the output terminal 221 side, and the other end 1221b, 1222b is connected to the output terminal 222 side. For example, the third and fourth windings 1221 and 1222 are connected between the output terminals 221 and 222 in the same relationship as the first and second windings 1211 and 1212 (FIG. 5).

  For the fifth and sixth windings 1231 and 1232, one ends 1231 a and 1232 a are connected to the output terminal 231 side, and the other ends 1231 b and 1232 b are connected to the output terminal 232 side. For example, the fifth and sixth windings 1231 and 1232 are connected between the output terminals 231 and 232 in the same relationship as the first and second windings 1211 and 1212 (FIG. 5).

  Regarding the contents described above, the switches S1 to S6 can be grasped as follows. That is, the switches S1 and S2 are connected in series with both the first and second windings 1211 and 1212 between the input terminals 241 and 242, respectively. The switches S3 and S4 are respectively connected in series with the third and fourth windings 1221 and 1222 between the input terminals 241 and 242. The switches S5 and S6 are connected in series with both the fifth and sixth windings 1231 and 1232 between the input terminals 241 and 242, respectively.

  By controlling both switches S1 and S2 to be on, the first phase current (V-phase current) flows. By controlling both switches S3 and S4 to be on, a second phase current (W-phase current) flows. By controlling both switches S5 and S6 to be on, a third phase current (U-phase current) flows.

  Therefore, the control C4 is executed by controlling each of the switches S1 and S2 and the switches S5 and S6 to be on. The control C5 is executed by controlling each of the switches S1, S2 and the switches S3, S4 to be on. The control C6 is executed by controlling each of the switches S3 and S4 and the switches S5 and S6 to be on. The relationship between the controls C4 to C6 and the switching of the switches S1 to S6 is shown in FIG.

  In the control unit 2, the same control as described above can be executed without the diodes Di1 to Di6. Specifically, only one of the switches S1 and S2 is connected in series with the first and second windings 1211 and 1212 between the input terminals 241 and 242. Similarly, only one of the switches S3 and S4 is connected in series with the third and fourth windings 1221 and 1222 between the input terminals 241 and 242, and only one of the switches S5 and S6 is The fifth and sixth windings 1231 and 1232 are connected in series between the input terminals 241 and 242.

Second embodiment.
For example, the control unit 2 can execute the following control on the reluctance motor 1. That is, the control unit 2 controls only the first phase current (V-phase current) to flow through the first and second windings 1211 and 1212, and only the second phase current (W-phase current) is the first. The control C2 flowing through the third and fourth windings 1221, 1222 and the control C3 flowing only the third phase current (U-phase current) through the fifth and sixth windings 1231, 1231 can be executed, respectively. . The controls C1 to C3 are commonly called “one-phase excitation”.

  FIG. 6 is a graph 301 to 303 showing changes in the reluctance torque T generated in the reluctance motor 1 with respect to the rotation angle θ. Graph 301 shows a case where only control C1 is executed, graph 302 shows a case where only control C2 is executed, and graph 303 shows a case where only control C3 is executed.

  The graph 301 has a period of 45 ° with respect to the rotation angle θ. This is because each time the rotor 11 rotates 45 °, the portion 111 faces the first winding 1211 or the second winding 1212 through which the first phase current (V-phase current) flows. . Similarly, the graphs 302 and 303 have a period of 45 ° with respect to the rotation angle θ.

  In the graph 301, the reluctance torque T is maximized when the rotation angle θ is an angle θ11 deviating from 0 ° in the rotation direction. In the graph 302, the reluctance torque T is maximized when the rotation angle θ is an angle θ12 deviating from 15 ° in the rotation direction. In the graph 303, the reluctance torque T is maximized when the rotation angle θ is an angle θ13 deviating from 30 ° in the rotation direction.

  The rotor 11 can be rotated by repeatedly executing the controls C1 to C3 in the desired order (control C11). For example, the controls C1 to C3 are repeatedly executed in this order.

  In the control C11, it is particularly desirable that the control C1 to C3 that has the maximum reluctance torque T generated in the reluctance motor 1 is selected and executed. A change with respect to the rotation angle θ of the reluctance torque T when the control C11 is executed in this manner is shown by a graph 503 in FIG. 9 described later.

  For the reluctance motor 1, the control unit 2 may perform a control method of repeatedly executing the controls C1 to C6 in a desired order. For example, the controls C4, C1, C5, C2, C6, and C3 are repeatedly executed in this order.

  In such a control method, it is particularly desirable to select and execute the control C1 to C6 that maximizes the reluctance torque T generated in the reluctance motor 1 (control C12).

  The control C12 will be specifically described with reference to FIGS. FIG. 7 shows a change 501 of the reluctance torque T with respect to the rotation angle θ when the controls C4, C1, C5, C2, C6, and C3 are executed in this order in the control C12. In FIG. 7, graphs 101 to 103 and 301 to 303 are also shown. Graphs 101 to 103 are indicated by broken lines, and graphs 301 to 303 are indicated by alternate long and short dash lines. FIG. 8 shows switching of the switches S <b> 1 to S <b> 6 of the control unit 2.

  When the rotation angle θ is in the range of angles D1 to D2, the reluctance torque T represented by the graph 101 is maximized, so that the control C4 is selected and executed (FIG. 8). When the rotation angle θ is in the range of the angles D2 to D3, the reluctance torque T represented by the graph 301 is maximized, so the control C1 is selected and executed (FIG. 8). When the rotation angle θ is in the range of the angles D3 to D4, the reluctance torque T represented by the graph 102 is maximized, so that the control C5 is selected and executed (FIG. 8). When the rotation angle θ is in the range of the angles D4 to D5, the reluctance torque T represented by the graph 302 is maximized, so the control C2 is selected and executed (FIG. 8). When the rotation angle θ is in the range of the angles D5 to D6, the reluctance torque T represented by the graph 103 is maximized, so the control C6 is selected and executed (FIG. 8). When the rotation angle θ is in the range of the angles D6 to D7, the reluctance torque T represented by the graph 303 is maximized, so the control C3 is selected and executed (FIG. 8).

  According to such control, the reluctance torque T can be increased by selectively executing the control C4 to C6 even in the rotation angle θ region where it is difficult to increase the reluctance torque only by the control of the controls C1 to C3. it can. Therefore, the output of the reluctance motor 1 is increased.

  This will be specifically described with reference to FIG. FIG. 9 shows a graph 501 and a graph 503. According to the graph 503, the reluctance torque T cannot be increased when the rotation angle θ is in the range of the angles D1 to D2, the range of the angles D3 to D4, and the range of the angles D5 to D6 with the control C1 to C3 alone. I understand that.

  However, by executing the control C12, the reluctance torque T is increased even when the rotation angle θ is in the range of angles D1 to D2, the range of angles D3 to D4, and the range of angles D5 to D6. Can be understood by comparing the graph 501 and the graph 503.

  FIG. 9 also shows a graph 502. A graph 502 is a case where the controls C1 to C6 are executed on the reluctance motor 11 (FIG. 3), and the control C1 to C6 having the maximum reluctance torque T is selected and executed (control C12a). ) Of the reluctance torque T with respect to the rotation angle θ.

  It can be seen from the comparison between the graph 501 and the graph 502 that the reluctance torque T greater than that obtained when the control C12a is executed can be obtained by executing the control C12. Specifically, the graph 501 shows a reluctance torque T higher than that of the graph 502 when the rotation angle θ is in the range of angles D1 to D2, the range of angles D3 to D4, and the range of angles D5 to D6. .

  FIG. 10 shows graphs 601 to 603 showing changes in the reluctance torque T with respect to the values of the currents flowing through the first to third windings. A graph 601 shows a case where the above-described control C12 is performed on the reluctance motor 1 (FIG. 1). A graph 602 shows a case where the above-described control C12a is executed on the reluctance motor 11 (FIG. 3). A graph 603 shows a case where the above-described control C11 is executed on the reluctance motor 1.

  By comparing the graph 601 with the graphs 602 and 603, executing the control C12 increases the reluctance torque T at any current value compared to when the control C12a is executed or when the control C11 is executed. You can see that

  In any of the first and second embodiments, for the reluctance motor 1, the number A1 of the portions 111 and the number of sets A2 of the first to sixth windings 1211, 1212, 1221, 1222, 1231, and 1232 Although (A1, A2) = (8, 2) has been described (FIG. 1), the above description can also be applied to reluctance motors having other combinations (A1, A2).

Third embodiment.
FIG. 11 conceptually shows the control unit 21 according to the present embodiment. The control unit 21 is connected to the above-described reluctance motor 11 (FIG. 3) and performs desired control on the reluctance motor 11.

  The control unit 21 has the same configuration as the control unit 2, and further includes switches S7 and S8 and diodes Di7 and Di8.

  The switch S7 is connected between the output terminal 221 and the input terminal 242. The switch S8 is connected between the output terminal 222 and the input terminal 241.

  The diode Di7 has an anode connected to the output terminal 221 and a cathode connected to the input terminal 241. The diode Di8 has an anode connected to the input terminal 242 and a cathode connected to the output terminal 222.

  The control unit 21 controls the switches C3 and C4 to be turned on and the switches S7 and S8 to be turned off, so that a current is supplied from the output terminal 221 to the output terminal 222 with respect to the third and fourth windings 1221 and 1222. Shed. On the other hand, by controlling the switches C3 and C4 to be turned off and the switches S7 and S8 to be turned on, a current flows from the output terminal 222 to the output terminal 221 with respect to the third and fourth windings 1221 and 1222.

  FIG. 12 conceptually shows the control C31 of the control unit 21 for the reluctance motor 11. The control C31 is executed as follows.

  When the rotation angle θ is in the range of angles D1 to D2, the switches S1 and S2 and the switches S5 and S6 are controlled to be turned on (control C311). When the rotation angle θ is in the range of the angles D2 to D3, the switches S1 and S2 are each controlled to be turned on (control C312). When the rotation angle θ is in the range of the angles D3 to D4, the switches S1 and S2 and the switches S7 and S8 are respectively controlled to be turned on (control C313). When the rotation angle θ is in the range of the angles D4 to D5, the switches S3 and S4 are respectively controlled to be on (control C314). When the rotation angle θ is in the range of the angles D5 to D6, the switches S5 and S6 and the switches S7 and S8 are each controlled to be turned on (control C315). When the rotation angle θ is in the range of the angles D6 to D7, the switches S5 and S6 are respectively controlled to be on (control C316).

  According to the control C31, the control C31 is executed regardless of the range of the rotation angle θ between the angles D1 to D2, D2 to D3, D3 to D4, D4 to D5, D5 to D6, and D6 to D7. The current flowing in the case and the current flowing when the control C12 is executed on the reluctance motor 1 have the same flow direction when viewed from the inner peripheral side.

  Therefore, the change with respect to the rotation angle θ of the reluctance torque T generated by executing the control C31 is the same as the graph 501 shown in FIG. That is, the magnetic saturation is reduced and the reluctance torque is increased as described in the first and second embodiments.

  The controls C313 and C315 can be grasped as follows. That is, only any two phase currents of the three-phase currents are caused to flow in parallel, and the flow directions of the two phase currents when viewed from the inner circumference side are the same in adjacent windings in the circumferential direction 92. It is.

  Specifically, by executing the control C313, only the first and second phase currents (V-phase and W-phase currents) are allowed to flow in parallel. The direction of the flow of the phase current when viewed from the inner peripheral side is the first and third windings 1211 and 1221 adjacent to each other in the circumferential direction 92 and the second and fourth windings 1212 and 1222. The same.

  Also, by executing the control C315, only the first and third phase currents (V-phase and U-phase currents) are allowed to flow in parallel. The direction of the flow of the phase current when viewed from the inner peripheral side is the first and fifth windings 1211 and 1231 adjacent in the circumferential direction 92 and the second and sixth windings 1212 and 1232. The same.

It is a figure which shows notionally the reluctance motor 1 concerning 1st Embodiment. It is a figure which shows the change with respect to rotation angle (theta) of the reluctance torque T. FIG. 1 is a diagram conceptually showing a reluctance motor 11. FIG. 2 is a circuit diagram conceptually showing a control unit 2. FIG. It is a figure which shows the connection relation of a coil | winding. It is a figure which shows the change with respect to rotation angle (theta) of the reluctance torque T. FIG. It is a figure which shows the change with respect to rotation angle (theta) of the reluctance torque T. FIG. It is a figure which shows notionally switching of switch S1-S6. It is a figure which shows the change with respect to rotation angle (theta) of the reluctance torque T. FIG. It is a figure which shows the change with respect to the electric current of the reluctance torque. 2 is a circuit diagram conceptually showing a control unit 21. FIG. It is a figure which shows notionally switching of switch S1-S8.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Reluctance motor 2,21 Control part 11 Rotor 12 Stator 91 Predetermined axis 92 Circumferential direction 111 Parts 241,242 Input terminal 211-231,212-232 Output terminal 1211 1st coil 1212 2nd winding Line 1221 Third winding 1222 Fourth winding 1231 Fifth winding 1232 Sixth winding 1211a, 1211b, 1221a, 1221b, 1231a, 1231b, 1212a, 1212b, 1222a, 1222b, 1232a, 1232b End V First phase current W Second phase current U Third phase current S1-S8 Switch C1-C6 Control T Reluctance torque θ Rotation angle

Claims (6)

A magnetic rotor (11) having a plurality of portions (111) that can rotate about a predetermined axis (91) and project only on either the outer peripheral side or the inner peripheral side thereof;
First and second windings (1211, 1212) through which the first phase current (V) of the three-phase current flows, and third and fourth windings through which the second phase current (W) of the three-phase current flows. The windings (1221, 1222) and the fifth and sixth windings (1231, 1232) through which the third phase current (U) of the three-phase current flows, A stator (12) provided opposite to
The first, third, and fifth windings are arranged adjacently along the circumferential direction (92) around the predetermined axis in this order, and both ends (1211a, 1211b, 1221a, 1221b, 1231a, 1231b), and one end (1211a, 1221a, 1231a) on the high potential side of the both ends is used as a starting point, and is wound in a clockwise direction when viewed from the one side,
The second, fourth, and sixth windings are arranged adjacently along the circumferential direction (92) around the predetermined axis in this order, and both ends (1212a, 1212b, 1222a, 1222b, 1232a, 1232b), and one end (1212a, 1222a, 1232a) on the high potential side of the two ends is wound as a starting point in the direction opposite to the clockwise direction when viewed from the one side.
Reluctance motor. A pair of input terminals (241, 242);
First to third output terminals (211 to 231) connected to one (241) of the pair of input terminals;
Fourth to sixth output terminals (212 to 232) connected to the other (242) of the pair of input terminals;
A control unit (2) having first to third switches (S1, S3, S5);
In each of the first and second windings (1211, 1212), the one end (1211a, 1212a) is on the first output terminal side, and the other end (1211b, 1212b) is the fourth output. Connected to each terminal side,
In each of the third and fourth windings (1221, 1222), the one end (1221a, 1222a) is on the second output terminal side, and the other end (1221b, 1222b) is the fifth output. Connected to each terminal side,
In each of the fifth and sixth windings (1231, 1232), the one end (1231a, 1232a) is on the third output terminal side, and the other end (1231b, 1232b) is the sixth output. Connected to each terminal side,
The first switch is connected in series with both the first and second windings between the input terminals,
The second switch is connected in series with the third and fourth windings between the input terminals,
The third switch is connected in series with any of the fifth and sixth windings between the input terminals.
The reluctance motor according to claim 1. A magnetic rotor (11) having a plurality of portions (111) that can rotate about a predetermined axis (91) and project only on either the outer peripheral side or the inner peripheral side thereof;
A plurality of first windings (1211, 1212) through which the first phase current (V) among the three-phase currents flows, and a second winding through which the second phase current (W) among the three-phase currents flows. And a plurality of third windings (1231, 1232) through which a third phase current (U) among the three-phase currents flows, and the one of the three windings (1231, 1222) A stator (12) provided opposite to
A control unit (21),
The first to third windings are repeatedly arranged in this order along the circumferential direction (92) around the predetermined axis,
The controller is
A pair of input terminals (241, 242);
First to third output terminals (211 to 231) connected to one (241) of the pair of input terminals;
Fourth to sixth output terminals (212 to 232) connected to the other (242) of the pair of input terminals;
A control unit (2) having first to sixth switches (S1, S3, S5, S7, S8, S4);
The first winding has both ends (1211a, 1211b, 1212a, 1212b), one end (1211a, 1212a) is on the first output terminal side, and the other end (1211b, 1212b) is the fourth. Connected to the output terminal side,
The second winding has both ends (1221a, 1221b, 1222a, 1222b), one end (1221a, 1222a) on the second output terminal side, and the other end (1221b, 1222b) on the fifth output. Connected to the output terminal side,
The third winding has both ends (1231a, 1231b, 1232a, 1232b), one end (1231a, 1232a) on the third output terminal side, and the other end (1231b, 1232b) on the sixth. Connected to the output terminal side,
The first switch is connected in series with both the first and second windings between the input terminals,
The third switch is connected in series with any of the fifth and sixth windings between the input terminals,
The second and fourth switches (S3, S7) are connected between the one (241) and the other (242) of the input terminals and the second output terminal (221). ,
The fifth and sixth switches (S8, S4) are connected between the one and the other of the input terminals and the fifth output terminal (222),
Reluctance motor. A method for controlling a reluctance motor (1, 11) according to any one of claims 1 to 3,
A first control (C1) for flowing only the first phase current (V);
A second control (C2) for flowing only the second phase current (W);
A third control (C3) for flowing only the third phase current (U);
A fourth control (C4) for flowing only the third and first phase currents;
A fifth control (C5) for flowing only the first and second phase currents;
Of the sixth control (C6) in which only the second and third phase currents flow, the one having the maximum reluctance torque (T) generated by the control is the rotation angle (θ) of the rotor. A control method of a reluctance motor selected and executed. A magnetic rotor (11) having a plurality of portions (111) that can rotate about a predetermined axis (91) and project only on either the outer peripheral side or the inner peripheral side thereof;
A plurality of first windings (1211, 1212) through which the first phase current (V) among the three-phase currents flows, and a second winding through which the second phase current (W) among the three-phase currents flows. And a plurality of third windings (1231, 1232) through which a third phase current (U) among the three-phase currents flows, and the one of the three windings (1231, 1222) A stator (12) provided opposite to
The first to third windings are arranged in this order with respect to the reluctance motor (1, 11) repeatedly arranged along the circumferential direction (92) around the predetermined axis.
Only two of the three-phase currents are flowed,
The flow directions of the two phase currents when viewed from the one side are the same in windings adjacent to each other in the circumferential direction.
Reluctance motor control method. A first control (C1) for flowing only the first phase current (V);
A second control (C2) for flowing only the second phase current (W);
A third control (C3) for flowing only the third phase current (U);
A fourth control (C4) for flowing only the third and first phase currents;
A fifth control (C5) for flowing only the first and second phase currents;
Of the sixth control (C6) in which only the second and third phase currents flow, the reluctance torque (T) generated by the control is maximized for each rotation angle (θ) of the rotor. Selected and executed,
The reluctance motor control method according to claim 5.

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