WO2019009195A1

WO2019009195A1 - Consequent motor

Info

Publication number: WO2019009195A1
Application number: PCT/JP2018/024784
Authority: WO
Inventors: 智哉上田; 祐輔牧野
Original assignee: 日本電産株式会社
Priority date: 2017-07-03
Filing date: 2018-06-29
Publication date: 2019-01-10
Also published as: CN211321250U

Abstract

The number of a plurality of coils of a consequent motor is a multiple of 6 and the number of a plurality of magnetic poles is an odd number of 3 or more. A control unit includes a first inverter that controls a current supplied to a first coil group among the plurality of coils and a second inverter that controls a current supplied to a second coil group radially opposed to the first coil group among the plurality of coils. A first harmonic current including a primary harmonic current as a main wave current is superimposed on a fundamental current of a d-axis current of the first coil group by the first inverter. A second harmonic current including a primary harmonic current as a main wave current is superimposed on a fundamental current of a d-axis current of the second coil group by the second inverter. The peak phases of three-phase alternating currents supplied to the first coil group and the second coil group are shifted with respect to each other, and the zero-cross positions of the currents are the same.

Description

Concurrent type motor

The present invention relates to a consistent type motor.

In recent years, due to the soaring of neodymium magnets and the like, a motor with a reduced amount of use of magnets has been required. For example, Japanese Patent No. 5431 886 discloses a motor provided with a rotor of a consistent pole type structure. In the rotor, a plurality of magnets of one magnetic pole are arranged in the circumferential direction of the rotor core. Further, a salient pole integrally formed on the rotor core is disposed between the magnets, and the salient pole functions as the other magnetic pole. In such a motor, the magnetic flux density of the teeth facing the magnet is smaller than the magnetic flux density of the teeth facing the salient pole, so there is a possibility that the motor may vibrate due to the magnetic unbalance of the rotor. .

The motor of Japanese Patent No. 5431 886 comprises current supply means for supplying three-phase excitation current to the coils of the stator. The current supply means implements different current control for each coil group to which three-phase excitation current is supplied. Thereby, the magnitude of the electromagnetic force acting on the teeth is adjusted between the coil groups. In this motor, by making the electromagnetic force acting on the teeth facing the magnet different from the electromagnetic force acting on the teeth facing the salient pole, the magnetic unbalance of the rotor is suppressed to reduce the motor's low vibration. Is being promoted.
Patent No. 5431 886

By the way, in the motor of Japanese Patent No. 5431 886, in order to suppress the magnetic imbalance of the rotor, in the excitation current supplied from the first drive circuit 33 which is the current supply means to the first coil group U1, V1, W1 The absolute value of the negative component of the current value is controlled to be lower than the absolute value of the positive component. The same applies to the excitation current supplied from the second drive circuit 38 to the second coil group U2, V2, W2. As described above, in the motor, it is necessary to perform different control for the positive component and the negative component of the current value, which may complicate current control.

The present invention has been made in view of the above problems, and it is an object of the present invention to reduce the magnetic unbalance and realize the low vibration of the motor while suppressing the current control from becoming complicated in the consistent motor. There is.

An exemplary consistent motor according to an embodiment of the present invention includes an armature having a plurality of coils arranged in a circumferential direction, and a plurality of magnetic poles and a plurality of pseudo poles alternately arranged in a circumferential direction. A power supply unit that supplies a three-phase alternating current to the plurality of coils, and a control unit that controls an output from the power supply unit. The number of the plurality of coils is a multiple of six. The number of the plurality of magnetic poles is an odd number of 3 or more. The control unit controls a first inverter for controlling a current supplied to a first coil group among the plurality of coils, and a second coil group radially facing the first coil group among the plurality of coils. And a second inverter that controls the supplied current. A first harmonic current including a first harmonic current as a main wave current is superimposed on the fundamental wave current of the d-axis current of the first coil group by the first inverter. A second harmonic current including a first harmonic current as a main wave current is superimposed on the fundamental wave current of the d-axis current of the second coil group by the second inverter. The peak phases of the three-phase alternating current supplied to the first coil group and the second coil group are shifted, and the zero cross positions are the same.

According to the present invention, it is possible to reduce the magnetic imbalance and realize low vibration of the motor while suppressing the current control from becoming complicated.

It is a cross-sectional view of the motor which concerns on one Embodiment. It is a cross-sectional view of a motor. It is a figure which shows the connection state of several coils and a control part. It is a figure which shows U phase current supplied to a coil when harmonic current is not superimposed on d axis current. It is a figure which shows U phase current supplied to a coil, when harmonic current is superimposed on d axis current. It is a figure which shows U phase current, V phase current, and W phase current which are supplied to a coil, when harmonic current is not superimposed on d axis current. It is a figure which shows U phase current, V phase current, and W phase current supplied to a coil, when harmonic current is superimposed on d axis current.

FIG. 1 is a cross-sectional view of a consistent motor 1 according to an exemplary embodiment of the present invention. In the following description, the corresponding motor 1 is simply referred to as "motor 1". The motor 1 is an inner rotor type brushless motor. In this specification, the circumferential direction about the central axis J1 perpendicular to the paper surface in FIG. 1 is simply referred to as “circumferential direction”, and the radial direction about the central axis J1 is simply referred to as “radial direction”. .

The motor 1 includes an armature 2, a rotor 3 and a control unit 4. The armature 2 includes a core back portion 21, a plurality of teeth 22, and a plurality of coils 24. The core back portion 21 is a substantially annular portion centered on the central axis J1. The plurality of teeth 22 radially extend radially inward from the core back portion 21. The plurality of teeth 22 are arranged at substantially equal angular intervals in the circumferential direction. The core back portion 21 and the plurality of teeth 22 are, for example, metal members of one connection.

The plurality of coils 24 are formed by winding a wire around the plurality of teeth 22 on an insulator (not shown) covering the plurality of teeth 22. Each coil 24 is a concentrated winding coil wound around one tooth 22. The plurality of coils 24 are arranged at substantially equal angular intervals in the circumferential direction. The plurality of coils 24 are three-phase coils. The number of coils 24 is a multiple of 6, preferably 12 or more. In the example shown in FIG. 1, the number of the plurality of coils 24 is twelve.

The rotor 3 is disposed radially inward of the armature 2. The rotor 3 includes a shaft 31, a rotor core 32, and a plurality of magnetic poles 33. The shaft 31 is a substantially cylindrical member centered on the central axis J1. The rotor core 32 is a substantially annular member made of magnetic metal. The rotor core 32 is connected to the outer peripheral surface of the shaft 31. The plurality of magnetic poles 33 are magnets fixed to the outer peripheral surface of the rotor core 32. In the plurality of magnetic poles 33, the radially outer poles are the same. For example, the radially outer pole of each magnetic pole 33 is an N pole. The plurality of magnetic poles 33 are arranged at substantially equal angular intervals in the circumferential direction while being separated from each other. The number of the plurality of magnetic poles 33 is an odd number of 3 or more. In the example shown in FIG. 1, the number of the plurality of magnetic poles 33 is five. In other words, the motor 1 is a 10P12S motor.

The rotor core 32 includes a plurality of convex portions 34 located between the plurality of magnetic poles 33 respectively. Each convex portion 34 is a portion that protrudes outward in the radial direction from the outer peripheral surface of the rotor core 32. The plurality of convex portions 34 are located at substantially the same position in the radial direction as the plurality of magnetic poles 33 and function as pseudo magnetic poles. In the following description, the convex portion 34 is referred to as “pseudo pole 34”. The rotor 3 is a consistent type rotor in which a plurality of magnetic poles 33 and a plurality of pseudo poles 34 are alternately arranged in the circumferential direction. The pseudo pole 34 is also called a salient pole.

In the motor 1, a three-phase alternating current is supplied from the power supply unit 5 to the plurality of coils 24 of the armature 2 so that torque is generated between the plurality of coils 24 and the plurality of magnetic poles 33 and the plurality of pseudo poles 34. Occur. Thus, the rotor 3 rotates about the central axis J1. The control unit 4 controls the output from the power supply unit 5. In other words, the control unit 4 controls the three-phase alternating current supplied to the plurality of coils 24. Control unit 4 includes a first inverter 41 and a second inverter 42.

In the motor 1 shown in FIG. 1, U-phase current is supplied to four coils 24 of the twelve coils 24, V-phase current is supplied to the other four coils 24, and the remaining four coils are supplied. The W-phase current is supplied to 24. In FIG. 2, four coils to which U-phase current is supplied are denoted by U1 to U4, and four coils to which V-phase current is supplied are denoted by V1 to V4, and W-phase current is supplied. The symbols W1 to W4 are given to the four coils.

The coil U1 and the coil U2 are circumferentially adjacent to each other. The coil U3 and the coil U4 are circumferentially adjacent to each other. The coil U1 and the coil U3 oppose each other in the radial direction across the central axis J1. The coil U2 and the coil U4 oppose each other in the radial direction across the central axis J1. In other words, the coil U3 is disposed at a position offset by 180 degrees in the circumferential direction from the coil U1. Further, the coil U4 is disposed at a position shifted by 180 degrees in the circumferential direction from the coil U2.

Coil V1 is circumferentially adjacent to coil U2 and coil V2. Coil V3 is circumferentially adjacent to coil U4 and coil V4. The coil V1 and the coil V3 oppose each other in the radial direction across the central axis J1. The coil V2 and the coil V4 oppose each other in the radial direction across the central axis J1. In other words, the coil V3 is disposed at a position deviated from the coil V1 by 180 degrees in the circumferential direction. Further, the coil V4 is disposed at a position deviated from the coil V2 by 180 degrees in the circumferential direction.

The coil W1 is circumferentially adjacent to the coil V2 and the coil W2. The coil W3 is circumferentially adjacent to the coil V4 and the coil W4. The coil W1 and the coil W3 oppose each other in the radial direction across the central axis J1. The coil W2 and the coil W4 oppose each other in the radial direction across the central axis J1. In other words, the coil W3 is disposed at a position deviated from the coil W1 by 180 degrees in the circumferential direction. In addition, the coil W4 is disposed at a position deviated from the coil W2 by 180 degrees in the circumferential direction.

FIG. 3 is a diagram showing a connection state between the plurality of coils U1 to U4, V1 to V4, W1 to W4 and the control unit 4. The coil U1 is electrically connected to the coil U4 adjacent to the radially opposing coil U3. The coil U1 and the coil U4 are connected to the first inverter 41 of the control unit 4. The first inverter 41 controls the current supplied to the coil U1 and the coil U4. The coil U3 is electrically connected to the coil U2 adjacent to the radially opposed coil U1. The coil U2 and the coil U3 are connected to the second inverter 42 of the control unit 4. The second inverter 42 controls the current supplied to the coil U2 and the coil U3.

The coil V1 is electrically connected to the coil V4 adjacent to the coil V3 facing in the radial direction. The coil V1 and the coil V4 are connected to the second inverter 42. The second inverter 42 controls the current supplied to the coil V1 and the coil V4. The coil V3 is electrically connected to the coil V2 adjacent to the radially opposing coil V1. The coil V2 and the coil V3 are connected to the first inverter 41. The first inverter 41 controls the current supplied to the coil V2 and the coil V3.

The coil W1 is electrically connected to the coil W4 adjacent to the coil W3 facing in the radial direction. The coil W1 and the coil W4 are connected to the first inverter 41. The first inverter 41 controls the current supplied to the coil W1 and the coil W4. The coil W3 is electrically connected to the coil W2 adjacent to the coil W1 facing in the radial direction. The coil W2 and the coil W3 are connected to the second inverter 42. The second inverter 42 controls the current supplied to the coil W2 and the coil W3.

In motor 1, the first harmonic current is superimposed on the fundamental wave current of the d-axis current by the three-phase alternating current supplied to coils U1, U4, V2, V3, W1 and W4 by first inverter 41. Ru. Further, the second harmonic current is superimposed on the fundamental wave current of the d-axis current by the three-phase alternating current supplied to the coils U2, U3, V1, V4, W2 and W3 by the second inverter 42.

The first harmonic current and the second harmonic current each include a first harmonic current at an electrical angle as a main wave current. In the following description, the order at the electrical angle of the harmonic current is simply referred to as the "order". For example, the first harmonic current at electrical angle is simply referred to as "first harmonic current". Furthermore, when the first harmonic current and the second harmonic current include harmonic currents of a plurality of types of orders, the main wave current described above includes the first harmonic of the harmonic currents of the plurality of types of orders. It means a harmonic current of one or more orders which substantially or mainly determines the characteristics of the current and the second harmonic current. The first harmonic current included in each of the first harmonic current and the second harmonic current is, for example, a sinusoidal current. Each of the first harmonic current and the second harmonic current is, for example, a first harmonic current, and substantially does not include a second or higher harmonic current. Further, the fundamental wave current of the above-mentioned d-axis current is a zero-order current substantially not including a harmonic current of the first or higher order.

The center of oscillation of the first harmonic current coincides with, for example, the fundamental current of the d-axis current on which the first harmonic current is superimposed. The center of oscillation of the second harmonic current coincides with, for example, the fundamental current of the d-axis current on which the second harmonic current is superimposed. The amplitude of the first harmonic current is the same as the amplitude of the second harmonic current. The phase of the first harmonic current is out of phase with the second harmonic current by 180 degrees in electrical angle. In other words, the first harmonic current is a current in reverse phase of the second harmonic current.

FIGS. 4 and 5 show the first harmonic current and the second harmonic current with respect to the d-axis current for U-phase current supplied to coils U1 and U4 and U-phase current supplied to coils U2 and U3. It is a figure which shows the influence by superposition. The horizontal axes in FIGS. 4 and 5 indicate mechanical angles, and the vertical axes indicate current values.

In FIG. 4, a U-phase current supplied to the coils U1 and U4 and the coils U2 and U3 when the first harmonic current and the second harmonic current are not superimposed on the d-axis current is indicated by a solid line 60U. When the first harmonic current and the second harmonic current are not superimposed on the d-axis current, the U-phase current supplied to the coils U1 and U4 is the same as the U-phase current supplied to the coils U2 and U3. In the following description, the U-phase current indicated by the solid line 60U is referred to as "basic U-phase current 60U".

When basic U-phase current 60U is supplied to coils U1 and U4 and coils U2 and U3, the electromagnetic forces acting on coils U1 and U4 and coils U2 and U3 become the same. Therefore, as shown in FIG. 2, the magnetic flux density of the teeth 22 in which the coils U1 and U4 radially opposed to the magnetic pole 33 are wound is wound by the coils U2 and U3 opposed radially to the pseudo pole 34. It becomes smaller than the magnetic flux density of teeth 22. As a result, the magnetic unbalance of the rotor 3 may occur and the motor 1 may vibrate.

In FIG. 5, a U-phase current supplied to the coils U1 and U4 when the first harmonic current is superimposed on the d-axis current is indicated by a solid line 61U. A U-phase current supplied to the coils U2 and U3 when the second harmonic current is superimposed on the d-axis current is indicated by a broken line 62U. In the following description, the U-phase current indicated by a solid line 61U is referred to as "first U-phase current 61U", and the U-phase current indicated by a broken line 62U is referred to as "second U-phase current 62U".

The peak position of the first U-phase current 61U supplied to the coils U1 and U4 is shifted to the negative side of the horizontal axis from the peak position of the basic U-phase current 60U by superimposing the first harmonic current on the d-axis current . The peak position means a mechanical angle at which the U-phase current becomes maximum or minimum. The peak values on the positive side and the negative side of the first U-phase current 61U may be the same as or different from the peak values on the positive side and the negative side of the basic U-phase current 60U, respectively. In other words, the amplitude of the first U-phase current 61U may be the same as or different from the amplitude of the basic U-phase current 60U. The zero cross position of the first U phase current 61U is the same as the zero cross position of the basic U phase current 60U. The zero cross position means a mechanical angle at which the U-phase current becomes zero. The meanings of the peak position and the zero cross position described above are the same as in the V-phase current and the W-phase current.

The peak position of the second U-phase current 62U supplied to the coils U2 and U3 deviates from the peak position of the basic U-phase current 60U to the plus side of the horizontal axis due to the second harmonic current being superimposed on the d-axis current . That is, the peak position of the second U-phase current 62U deviates from the peak position of the basic U-phase current 60U to the opposite side of the peak position of the first U-phase current 61U. The absolute value of the deviation from the basic U-phase current 60U at the peak position of the second U-phase current 62U is equal to the absolute value of the deviation from the basic U-phase current 60U at the peak position of the first U-phase current 61U.

The peak values on the positive side and the negative side of the second U-phase current 62U may be the same as or different from the peak values on the positive side and the negative side of the basic U-phase current 60U, respectively. In other words, the amplitude of the second U-phase current 62U may be the same as or different from the amplitude of the basic U-phase current 60U. The positive and negative peak values of the second U-phase current 62U are the same as the positive and negative peak values of the first U-phase current 61U, respectively. In other words, the amplitude of the second U-phase current 62U is the same as the amplitude of the first U-phase current 61U. The zero cross position of the second U phase current 62U is the same as the zero cross position of the basic U phase current 60U and the zero cross position of the first U phase current 61U. The first U-phase current 61U and the second U-phase current 62U are symmetrical about a straight line parallel to the vertical axis through the peak position of the basic U-phase current 60U.

In the motor 1, for example, under the control of the first inverter 41, the coils U1 and U4 face the magnetic poles 33 of the rotor 3 in the radial direction, and the coils U2 and U3 face the pseudo poles 34 in the radial direction. , U4 is supplied with the peak value of the first U-phase current 61U. In this case, the second U-phase current 62U controlled by the second inverter 42 is smaller than the peak value, and the coils U2 and U3 are supplied with the second U-phase current 62U. Thus, the electromagnetic force acting on the coils U2 and U3 radially opposed to the pseudo pole 34 is smaller than the electromagnetic force acting on the coils U1 and U4 radially opposed to the magnetic pole 33. As a result, the magnetic flux density of the teeth 22 in which the coils U2 and U3 radially opposed to the pseudo pole 34 are wound, and the magnetic flux density of the teeth 22 in which the coils U1 and U4 radially opposed to the magnetic pole 33 are wound. And become approximately equal.

FIG. 6 is a diagram showing a basic V-phase current 60 V and a basic W-phase current 60 W in addition to the basic U-phase current 60 U described above. FIG. 7 is a diagram showing a first V-phase current 61V and a second V-phase current 62V, and a first W-phase current 61W and a second W-phase current 62W in addition to the first U-phase current 61U and the second U-phase current 62U described above. is there. The horizontal axes of FIGS. 6 and 7 indicate mechanical angles, and the vertical axes indicate current values.

The basic V-phase current 60 V and the basic W-phase current 60 W are respectively the V-phase current supplied to the coils V1 to V4 when the first harmonic current and the second harmonic current are not superimposed on the d-axis current, and It is a W-phase current supplied to W1 to W4. The first V phase current 61 V and the second V phase current 62 V are the V phase current supplied to the coils V2 and V3 when the first harmonic current is superimposed on the d axis current, and the second harmonic current in the d axis current It is a V-phase current supplied to the coils V1 and V4 when the current is superimposed. The first W-phase current 61W and the second W-phase current 62W are the W-phase current supplied to the coils W1 and W4 when the first harmonic current is superimposed on the d-axis current, and the second harmonic in the d-axis current It is a W-phase current supplied to the coils W2 and W3 when the current is superimposed.

In motor 1, with respect to the V-phase current supplied to coils V1 to V4 and the W-phase current supplied to coils W1 to W4, the above-described U-phase currents by first inverter 41 and second inverter 42 are Control similar to the control is performed. As a result, the occurrence of magnetic unbalance in the rotor 3 is prevented or suppressed, and the vibration of the motor 1 caused by the magnetic unbalance is also prevented or suppressed.

As described above, the motor 1 includes the armature 2, the rotor 3, and the control unit 4. The armature 2 has a plurality of coils 24 arranged in the circumferential direction. In the rotor 3, the plurality of magnetic poles 33 and the plurality of pseudo poles 34 are alternately arranged in the circumferential direction. The control unit 4 controls the three-phase alternating current supplied to the plurality of coils 24. The number of coils 24 is a multiple of six. The number of the plurality of magnetic poles 33 is an odd number of 3 or more.

Control unit 4 includes a first inverter 41 and a second inverter 42. Here, coils U1, V3 and W1 among the plurality of coils 24 are collectively referred to as "first coil group U1, V3 and W1", and coils U3, V1 and W3 are collectively referred to as "second coil group U3, V1 and V2 The first inverter 41 controls the current supplied to the first coil group U1, V3, and W1 among the plurality of coils 24 when called “W3”. Further, the second inverter 42 controls the current supplied to the second coil group U3, V1, W3 radially opposed to the first coil group U1, V3, W1 among the plurality of coils 24.

In the motor 1, the first inverter 41 includes the first harmonic current including the first harmonic current as the main wave current superimposed on the fundamental wave current of the d-axis current of the first coil group U1, V3, W1. Ru. Further, a second harmonic current including a first harmonic current as a main wave current is superimposed by the second inverter 42 on the fundamental wave current of the d-axis current of the second coil group U3, V1, W3. Then, the peak phases of the three-phase alternating current supplied to the first coil group U1, V3, W1 and the second coil group U3, V1, W3 are shifted, and the zero cross positions are the same.

Thereby, one coil group of the first coil group U1, V3, W1 and the second coil group U3, V1, W3 radially faces the magnetic pole 33, and the other coil group is pseudo pole 34 in the radial direction It is possible to easily realize control to make the current supplied to the one coil group larger than the current supplied to the other coil group, when facing each other. As a result, while suppressing the current control of the three-phase alternating current in the motor 1 from becoming complicated, the magnetic unbalance of the rotor 3 can be reduced, and the vibration reduction of the motor 1 can be realized. Moreover, the electrical angle primary radial force applied to each tooth 22 can also be reduced.

Furthermore, in the motor 1, the peak values of the three-phase alternating current supplied to the first coil group U1, V3, W1 and the second coil group U3, V1, W3 are the same. Thereby, compared with the case where peak values differ, it can suppress further that current control of the three-phase alternating current in the motor 1 is complicated.

In the motor 1, the first harmonic current included in the first harmonic current and the second harmonic current is a sinusoidal current. Thereby, since the change of the three-phase alternating current supplied to the first coil group U1, V3, W1 and the second coil group U3, V1, W3 becomes smooth, the change of the magnetic flux density of each tooth 22 also becomes smooth. . As a result, vibration reduction of the motor 1 can be suitably realized.

In the above example, the first harmonic current and the second harmonic current are first harmonic currents. Thereby, the generation interval of the control signal by the first inverter 41 and the second inverter 42 can be increased as compared with the case where the second harmonic current is included in the first harmonic current and the second harmonic current. it can. As a result, current control of the three-phase alternating current in the motor 1 can be facilitated. In addition, since the resolution decreases as the order of the harmonic current increases, the accuracy of the above-described current control can be improved by setting the first harmonic current and the second harmonic current as the first harmonic current. it can. In the current control, when the PWM (Pulse Width Modulation) frequency is constant, the generation interval of the control signal is also constant.

As mentioned above, the number of the plurality of coils 24 is 12 or more. Further, the first coil group U1, V3, W1 is electrically connected to the coil groups U4, V2, W4 adjacent to the second coil group U3, V1, W3 among the plurality of coils 24. The second coil groups U3, V1, and W3 are electrically connected to the coil groups U2, V4, and W2 adjacent to the first coil groups U1, V3, and W1 among the plurality of coils 24. Thereby, current control of the three-phase alternating current in the motor 1 provided with the 12 or more coils 24 can be facilitated.

In the above-mentioned example, the number of the plurality of coils 24 is twelve, and the number of the plurality of magnetic poles 33 is five, the number of the plurality of magnetic poles 33 is five. Although the technology for realizing the above-described embodiment has been described, the number of coils 24 and magnetic poles 33 of the motor 1 is not limited to the above example. For example, in the 14P12S motor 1 in which the number of the plurality of coils 24 is 12 and the number of the plurality of magnetic poles 33 is 7, the above current control by the first inverter 41 and the second inverter 42 is performed. While suppressing the current control of the phase alternating current from becoming complicated, the magnetic unbalance of the rotor 3 can be reduced, and the vibration of the motor 1 can be reduced.

In the motor 1 described above, various modifications are possible.

For example, the first harmonic current included in the first harmonic current and the second harmonic current does not necessarily have to be a sine wave current, and may be a non-sinusoidal current such as a substantially rectangular wave current. In addition, the first harmonic current and the second harmonic current may include harmonic currents of other orders as long as the first harmonic current is included as the main wave current.

The first coil groups U1, V3 and W1 do not necessarily have to be electrically connected to the coil groups U4, V2 and W4. The second coil groups U3, V1, and W3 do not necessarily have to be electrically connected to the coil groups U2, V4, and W2.

The peak values of the three-phase alternating current supplied to the first coil group U1, V3, W1 and the second coil group U3, V1, W3 by the control of the first inverter 41 and the second inverter 42 may be different. Even in this case, it is possible to reduce the vibration of the motor 1 while suppressing the current control of the three-phase alternating current from becoming complicated.

In the above-mentioned example, coil U1, V3 and W1 were made into the 1st coil group among a plurality of coils 24, and coil U3, V1 and W3 were made into the 2nd coil group, and composition and effect of motor 1 were explained. The same applies to the case where V2 and W4 are the first coil group, and coils U2, V4 and W2 are the second coil group.

In the motor 1, the number of the plurality of coils 24 is not limited to 12 and may be a multiple of six. Further, the number of the plurality of magnetic poles 33 is not limited to 5 or 7, and may be an odd number of 3 or more.

The configurations in the above embodiment and each modification may be combined as appropriate as long as no contradiction arises.

The motor according to the present invention can be used as a motor for various applications.

1: Motor, 2: Armature, 3: Rotor, 4: Controller, 24, U1 to U4, V1 to V4, W1 to W4: Coil, 33: Magnetic pole, 34: Pseudo pole, 41: First inverter, 42 : Second inverter, J1: central axis, U1, V3, W1: first coil group, U3, V1, W3: second coil group

Claims

An armature having a plurality of coils arranged circumferentially;

A rotor having a plurality of magnetic poles and a plurality of pseudo poles alternately arranged in the circumferential direction;

A control unit that controls a three-phase alternating current supplied to the plurality of coils;

Equipped with

The number of the plurality of coils is a multiple of six,

The number of the plurality of magnetic poles is an odd number of 3 or more,

The control unit

A first inverter controlling a current supplied to a first coil group among the plurality of coils;

A second inverter that controls a current supplied to a second coil group radially facing the first coil group among the plurality of coils;

Equipped with

A first harmonic current including a first harmonic current as a main wave current is superimposed on the fundamental wave current of the d-axis current of the first coil group by the first inverter,

The second inverter current including the first harmonic current as a main wave current is superimposed on the fundamental wave current of the d-axis current of the second coil group by the second inverter,

A coincident type motor in which peak phases of three-phase alternating current supplied to the first coil group and the second coil group are deviated and a zero cross position is the same.
The coincident motor according to claim 1, wherein a first harmonic current included in the first harmonic current and the second harmonic current is a sine wave current.
The motor according to claim 1, wherein the first harmonic current and the second harmonic current are first harmonic currents.
The number of the plurality of coils is 12 or more,

The first coil group is electrically connected to a coil adjacent to the second coil group among the plurality of coils,

The consequent type motor according to any one of claims 1 to 3, wherein the second coil group is electrically connected to a coil adjacent to the first coil group among the plurality of coils.
The coincident type motor according to any one of claims 1 to 4, wherein peak values of three-phase alternating current supplied to the first coil group and the second coil group are the same.
The number of the plurality of coils is twelve,

The consistent motor according to any one of claims 1 to 5, wherein the number of the plurality of magnetic poles is five.
The number of the plurality of coils is twelve,

The consistent motor according to any one of claims 1 to 5, wherein the number of the plurality of magnetic poles is seven.