WO2023106337A1 - Stator and motor - Google Patents

Abstract

This stator comprises: a stator core; a plurality of first phase coils supported by the stator core at a two-slot pitch; and a plurality of second phase coils supported by the stator core at a two-slot pitch. The plurality of first phase coils are connected in series between a first input terminal and a first output terminal for a current. The plurality of second phase coils are connected in series between a second input terminal and a second output terminal for the current. First ordinal numbers indicating the order of the coils from the first input terminal are assigned respectively to the plurality of first phase coils. Second ordinal numbers indicating the order of the coils from the second input terminal are assigned respectively to the plurality of second phase coils. A single coil set is formed from one first phase coil and one second phase coil that is disposed so as to overlap with a portion of the one first phase coil. The first ordinal number of the first phase coil and the second ordinal number of the second phase coil that form the coil set are different.

Description

stator and motor

The present disclosure relates to stators and motors.

In the technical field related to motors, a rotating electric machine as disclosed in Patent Document 1 is known.

JP 2014-068441 A

A stator of the motor includes a stator core and a plurality of coils supported by the stator core. If the dielectric breakdown of the coil occurs, a short circuit may occur in the motor, or the torque generated by the motor may decrease, thereby degrading the performance of the motor.

An object of the present disclosure is to suppress dielectric breakdown of the coil.

According to the present disclosure, a stator core, a plurality of first phase coils supported by the stator core at a 2-slot pitch, and a plurality of second phase coils supported by the stator core at a 2-slot pitch; The phase coils are connected in series between a first input end and a first output end of the current, and a plurality of second phase coils are connected between the second input end and the second output end of the current. , each of the plurality of first-phase coils is given a first ordinal number indicating the order from the first input end, and each of the plurality of second-phase coils is given an order from the second input end A second ordinal number indicating the order is given, and one coil set is formed by one first phase coil and one second phase coil arranged so as to overlap a part of one first phase coil, A stator is provided wherein the first ordinal number of the first phase coils and the second ordinal number of the second phase coils forming the coil set are different.

According to the present disclosure, dielectric breakdown of the coil is suppressed.

FIG. 1 is a diagram schematically showing a motor according to an embodiment. FIG. 2 is a perspective view showing the stator according to the embodiment. FIG. 3 is a perspective view showing a stator core according to the embodiment. FIG. 4 is a diagram showing a motor drive circuit according to the embodiment. FIG. 5 is a diagram illustrating an operation example of the U-phase driving section according to the embodiment; FIG. 6 is a diagram illustrating an operation example of the U-phase driving section according to the embodiment; FIG. 7 is a diagram schematically showing a drive example of the drive circuit according to the embodiment. FIG. 8 is a diagram schematically showing a drive example of the drive circuit according to the embodiment. FIG. 9 is a diagram schematically showing a drive example of the drive circuit according to the embodiment. FIG. 10 is a perspective view showing a coil set supported by a stator core according to the embodiment; FIG. 11 is a diagram for explaining coils forming a coil set according to the embodiment. FIG. 12 is a diagram schematically showing a drive example of the drive circuit according to the embodiment. FIG. 13 is a perspective view showing a coil set supported by a stator core according to the embodiment; FIG. 14 is a diagram for explaining coils forming a coil set according to the embodiment. FIG. 15 is a diagram schematically showing a drive example of the drive circuit according to the embodiment; 16 is a perspective view showing a coil set supported by a stator core according to the embodiment; FIG. FIG. 17 is a diagram for explaining coils forming a coil set according to the embodiment.

Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiments. The constituent elements of the embodiments described below can be combined as appropriate. Also, some components may not be used.

[motor]
FIG. 1 is a diagram schematically showing a motor 1 according to an embodiment. In an embodiment the motor 1 is a switched reluctance motor. As shown in FIG. 1 , the motor 1 has a stator 2 and a rotor 3 .

The motor 1 is an inner rotor type. The stator 2 is arranged around the rotor 3 . The rotor 3 faces the stator 2 . The rotor 3 rotates around the rotation axis AX.

In the embodiments, the direction parallel to the rotation axis AX is appropriately referred to as the axial direction, the direction that rotates around the rotation axis AX is appropriately referred to as the circumferential direction, and the radial direction of the rotation axis AX is appropriately referred to as the radial direction. , is called.

A direction or position away from the center of the motor 1 in a specified direction in the axial direction is appropriately referred to as one axial side, and the opposite side of the one axial side is referred to as the other axial side. A prescribed direction in the circumferential direction is appropriately referred to as a circumferential one side, and the opposite side of the circumferential one side is appropriately referred to as a circumferential other side. The direction or position in the radial direction away from the rotation axis AX is appropriately referred to as the radially outer side, and the opposite side of the radially outer side is appropriately referred to as the radially inner side.

The stator 2 has a stator core 4 and coils 5 . The stator core 4 is arranged around the rotation axis AX. A coil 5 is supported by the stator core 4 .

The rotor 3 is arranged inside the stator core 4 . The rotor 3 has a rotor holder 6 , a rotor core 7 and a rotor shaft 8 . The rotor holder 6 is non-magnetic. The rotor core 7 is a magnetic body. The rotor core 7 is held by the rotor holder 6 . The rotor cores 7 function as poles of the rotor 3 .

The rotor 3 is connected to the object RS via the rotor shaft 8 . An example of the object RS is an engine mounted on a hybrid excavator, which is a type of construction machine. The motor 1 functions as a generator driven by the engine.

[Stator]
FIG. 2 is a perspective view showing the stator 2 according to the embodiment. FIG. 3 is a perspective view showing the stator core 4 according to the embodiment.

The stator core 4 includes a plurality of mutually laminated steel plates. The stator core 4 has a yoke 9 and teeth 10 . The yoke 9 is arranged around the rotation axis AX. The yoke 9 has a cylindrical shape around the rotation axis AX. The outer shape of the yoke 9 is circular in a plane perpendicular to the rotation axis AX. The teeth 10 protrude radially inward from the inner surface of the yoke 9 . A plurality of teeth 10 are arranged at intervals in the circumferential direction.

The surface of the stator core 4 includes an end surface 4A, an end surface 4B, an inner surface 4S and an outer surface 4T.

The end surface 4A faces one side in the axial direction. The end face 4A includes an end face of the yoke 9 facing one side in the axial direction and an end face of the tooth 10 facing one side in the axial direction. The end face of the yoke 9 and the end face of the teeth 10 are flush with each other. The end surface 4A and an axis parallel to the rotation axis AX are orthogonal to each other.

The end face 4B faces the other side in the axial direction. The end surface 4B includes an end surface of the yoke 9 facing the other side in the axial direction and an end surface of the teeth 10 facing the other side in the axial direction. The end face of the yoke 9 and the end face of the teeth 10 are flush with each other. The end face 4B and an axis parallel to the rotation axis AX are orthogonal to each other.

The inner surface 4S faces radially inward. Inner surface 4S includes the inner surface of tooth 10 . The inner surface 4</b>S faces the rotor 3 . The inner surface 4S is parallel to the rotation axis AX.

The outer surface 4T faces radially outward. The outer surface 4T includes the outer surface of the yoke 9. The outer surface 4T is parallel to the rotation axis AX. In a plane orthogonal to the rotation axis AX, the outer surface 4T has a circular shape centered on the rotation axis AX.

The coil 5 is attached to the tooth 10 via an insulator (not shown). A plurality of coils 5 are provided. A plurality of coils 5 are formed separately. In embodiments, the coil 5 is a so-called cassette coil. One coil 5 is formed by spirally winding one conductor. A square wire, a rectangular wire, or a round wire is exemplified as a spirally wound conductor. Note that one coil 5 may be formed by spirally connecting a plurality of conductors. A plate-shaped segment conductor is exemplified as a conductor connected in a spiral shape.

A slot 13 is provided between adjacent teeth 10 . A part of the coil 5 is arranged in the slot 13 . A portion of the coil 5 axially protrudes from the stator core 4 .

A plurality of slots 13 are provided in the circumferential direction. Slot 13 extends axially. One axial end of the slot 13 is connected to the end face 4A. The other end of the slot 13 in the axial direction is connected to the end surface 4B. The slot 13 is formed so as to be recessed radially outward from the inner surface 4S. The slot 13 has an opening 13A facing the rotor 3 and an outer end surface 13B. The opening 13A is formed in the inner surface 4S. The outer end surface 13B faces radially inward. The outer end surface 13B is connected to each of the end surfaces 4A and 4B. Outer end surface 13B forms a boundary with yoke 9 . On the inner surface of the slot 13, the outer end surface 13B is arranged radially outward.

In the embodiment, where n is an integer of 2 or more, the number of slots 13 of the stator core 4 satisfies the condition of 12×n. In the example shown in FIGS. 2 and 3, the number of slots 13 is 24 (=12×2). The number of teeth 10 is twenty-four.

The coil 5 is attached to some teeth 10 among the plurality of teeth 10 . Teeth 10 include mounted teeth 11 to which coils 5 are mounted and non-mounted teeth 12 to which coils 5 are not mounted.

In the embodiment, the winding method of the coil 5 is distributed winding in which one coil 5 is attached to a plurality of teeth 10 . In the embodiment, one coil 5 is attached to two teeth 10 (attachment teeth 11). That is, the coils 5 are supported by the stator core 4 with a two-slot pitch. Moreover, the winding method of the coil 5 is single-layer winding in which one coil 5 is arranged in one slot 13 .

The coil 5 has a coil body portion 15 and coil end portions 16 . The coil body portion 15 is arranged in the slot 13 . The coil end portions 16 protrude from the stator core 4 in the axial direction.

A pair of coil body portions 15 are provided on the coil 5 . Coil body portion 15 includes a first coil body portion 151 and a second coil body portion 152 . One coil body portion 15 is arranged in one slot 13 . When the first coil body portion 151 is arranged in the predetermined slot 13, the second coil body portion 152 is arranged in the slot 13 that is two slots next to the slot 13 in which the first coil body portion 151 is arranged.

A pair of coil end portions 16 are provided on the coil 5 . Coil end portion 16 includes a first coil end portion 161 and a second coil end portion 162 . The first coil end portion 161 protrudes from the end face 4A of the stator core 4 to one side in the axial direction. The second coil end portion 162 protrudes from the end face 4B of the stator core 4 to the other side in the axial direction.

The coils 5 include an outer coil 5o arranged at a first distance from the center of the stator core 4 and an inner coil 5i arranged at a second distance which is shorter than the first distance from the center of the stator core 4. The center of the stator core 4 coincides with the rotation AX.

The first distance is the distance between the rotation axis AX in the radial direction and the radially inner end of the outer coil 5o. The second distance is the distance between the rotation axis AX and the radially inner end of the inner coil 5i in the radial direction.

The radially inner end of the inner coil 5i is arranged radially inner than the radially inner end of the outer coil 5o. In the embodiment, all of the inner coils 5i are arranged radially inwardly of the outer coils 5o.

The motor 1 is a three-phase motor. Coil 5 includes a U-phase coil 5U, a V-phase coil 5V, and a W-phase coil 5W. A plurality of U-phase coils 5U are provided. U-phase coil 5U is supported by stator core 4 at a two-slot pitch. A plurality of V-phase coils 5V are provided. The V-phase coil 5V is supported by the stator core 4 with a 2-slot pitch. A plurality of W-phase coils 5W are provided. W-phase coil 5W is supported by stator core 4 at a two-slot pitch.

The number of U-phase coils 5U, the number of V-phase coils 5V, and the number of W-phase coils 5W are equal. In the example shown in FIG. 2, four U-phase coils 5U are provided. Four V-phase coils 5V are provided. Four W-phase coils 5W are provided. The number of coils 5 is twelve.

The outer coil 5o includes an outer U-phase coil 5Uo, an outer V-phase coil 5Vo, and an outer W-phase coil 5Wo. Inner coil 5i includes an inner U-phase coil 5Ui, an inner V-phase coil 5Vi, and an inner W-phase coil 5Wi.

The U-phase coil 5U includes an outer U-phase coil 5Uo and an inner U-phase coil 5Ui. The plurality of U-phase coils 5U are arranged at different positions in the circumferential direction. When four U-phase coils 5U are provided, the four U-phase coils 5U are arranged at intervals of about 90[°] around the rotation axis AX. When four U-phase coils 5U are provided, two outer U-phase coils 5Uo are provided and two inner U-phase coils 5Ui are provided. Outer U-phase coil 5Uo and inner U-phase coil 5Ui are alternately arranged in the circumferential direction. Two outer U-phase coils 5Uo are arranged to face each other in the radial direction. Two inner U-phase coils 5Ui are arranged to face each other in the radial direction.

The V-phase coil 5V includes an outer V-phase coil 5Vo and an inner V-phase coil 5Vi. The plurality of V-phase coils 5V are arranged at different positions in the circumferential direction. When four V-phase coils 5V are provided, the four V-phase coils 5V are arranged at intervals of about 90[°] around the rotation axis AX. When four V-phase coils 5V are provided, two outer V-phase coils 5Vo are provided and two inner V-phase coils 5Vi are provided. Outer V-phase coil 5Vo and inner V-phase coil 5Vi are alternately arranged in the circumferential direction. The two outer V-phase coils 5Vo are arranged to face each other in the radial direction. Two inner V-phase coils 5Vi are arranged to face each other in the radial direction.

The W-phase coil 5W includes an outer W-phase coil 5Wo and an inner W-phase coil 5Wi. The plurality of W-phase coils 5W are arranged at different positions in the circumferential direction. When four W-phase coils 5W are provided, the four W-phase coils 5W are arranged at intervals of about 90[°] around the rotation axis AX. When four W-phase coils 5W are provided, two outer W-phase coils 5Wo are provided and two inner W-phase coils 5Wi are provided. Outer W-phase coil 5Wo and inner W-phase coil 5Wi are alternately arranged in the circumferential direction. Two outer W-phase coils 5Wo are arranged to face each other in the radial direction. Two inner W-phase coils 5Wi are arranged to face each other in the radial direction.

In the embodiment, the slot 13 includes a first slot 131 in which the outer coil 5o is arranged and a second slot 132 in which the inner coil 5i is arranged.

A plurality of first slots 131 are provided. The multiple first slots 131 are provided at different positions in the circumferential direction. A plurality of second slots 132 are provided. The multiple second slots 132 are provided at different positions in the circumferential direction.

In the embodiment, one first slot 131 and one second slot 132 are arranged alternately in the circumferential direction.

The coil body portion 15 of the outer U-phase coil 5Uo, the coil body portion 15 of the outer V-phase coil 5Vo, and the coil body portion 15 of the outer W-phase coil 5Wo are arranged in the first slot 131, respectively. When the first coil main body portion 151 of the outer U-phase coil 5Uo is arranged in the predetermined first slot 131, the first coil main body portion 151 is arranged in the second coil main body portion 152 of the outer U-phase coil 5Uo. It is arranged in the first slot 131 next to the first slot 131 . The same applies to the outer V-phase coil 5Vo and the outer W-phase coil 5Wo.

The coil body portion 15 of the inner U-phase coil 5Ui, the coil body portion 15 of the inner V-phase coil 5Vi, and the coil body portion 15 of the inner W-phase coil 5Wi are arranged in the second slots 132, respectively. When the first coil main body portion 151 of the inner U-phase coil 5Ui is arranged in the predetermined second slot 132, the first coil main body portion 151 is arranged in the second coil main body portion 152 of the inner U-phase coil 5Ui. It is arranged in the second slot 132 next to the second slot 132 . The same applies to the inner V-phase coil 5Vi and the inner W-phase coil 5Wi.

The depth of the first slot 131 is deeper than the depth of the second slot 132. The depth of the slot 13 refers to the dimension of the slot 13 in the radial direction. That is, the depth of the slot 13 refers to the distance between the inner surface 4S (opening 13A) and the outer end surface 13B in the radial direction.

As shown in FIG. 3, the yoke thickness D1 at the first slot 131 is smaller than the yoke thickness D2 at the second slot 132. The yoke thickness of the slot 13 refers to the distance between the outer end surface 13B and the outer surface 4T in the radial direction.

In the embodiment, the outer coil 5o and part of the inner coil 5i are arranged so as to radially overlap. One coil set 30 is formed by one inner coil 5i and one outer coil 5o arranged so as to radially overlap a part of the inner coil 5i.

The coil set 30 is attached to the attached teeth 11 . The coil set 30 is not attached to the non-attached teeth 12 .

In one coil set 30, the position of the inner coil 5i and the position of the outer coil 5o are shifted by the dimension of one tooth 10 in the circumferential direction.

In one coil set 30, the phase of the inner coil 5i and the phase of the outer coil 5o are different.

In the example shown in FIG. 2, the number of coils 5 is twelve. When the number of coils 5 is 12, the coil set 30 includes a first coil set 31, a second coil set 32, a third coil set 33, a fourth coil set 34, a fifth coil set 35, and a sixth coil set 36 .

The first coil set 31 is formed by an inner U-phase coil 5Ui and an outer V-phase coil 5Vo arranged so as to partially overlap the inner U-phase coil 5Ui. Inner U-phase coil 5Ui is arranged radially inward of outer V-phase coil 5Vo. In the circumferential direction, the position of inner U-phase coil 5Ui and the position of outer V-phase coil 5Vo are shifted by the dimension of one tooth 10 .

The second coil set 32 is formed by an inner V-phase coil 5Vi and an outer W-phase coil 5Wo arranged so as to partially overlap the inner V-phase coil 5Vi. Inner V-phase coil 5Vi is arranged radially inward of outer W-phase coil 5Wo. In the circumferential direction, the position of inner V-phase coil 5Vi and the position of outer W-phase coil 5Wo are shifted by one tooth 10 dimension.

The third coil set 33 is formed by an inner W-phase coil 5Wi and an outer U-phase coil 5Uo arranged so as to partially overlap the inner W-phase coil 5Wi. Inner W-phase coil 5Wi is arranged radially inward of outer U-phase coil 5Uo. In the circumferential direction, the position of inner W-phase coil 5Wi and the position of outer U-phase coil 5Uo are shifted by one tooth 10 dimension.

The fourth coil set 34 is formed by an inner U-phase coil 5Ui and an outer V-phase coil 5Vo arranged so as to partially overlap the inner U-phase coil 5Ui. Inner U-phase coil 5Ui is arranged radially inward of outer V-phase coil 5Vo. In the circumferential direction, the position of inner U-phase coil 5Ui and the position of outer V-phase coil 5Vo are shifted by the dimension of one tooth 10 .

The fifth coil set 35 is formed by an inner V-phase coil 5Vi and an outer W-phase coil 5Wo arranged so as to partially overlap the inner V-phase coil 5Vi. Inner V-phase coil 5Vi is arranged radially inward of outer W-phase coil 5Wo. In the circumferential direction, the position of inner V-phase coil 5Vi and the position of outer W-phase coil 5Wo are shifted by one tooth 10 dimension.

The sixth coil set 36 is formed by an inner W-phase coil 5Wi and an outer U-phase coil 5Uo arranged so as to partially overlap the inner W-phase coil 5Wi. Inner W-phase coil 5Wi is arranged radially inward of outer U-phase coil 5Uo. In the circumferential direction, the position of inner W-phase coil 5Wi and the position of outer U-phase coil 5Uo are shifted by one tooth 10 dimension.

The first coil set 31, the second coil set 32, the third coil set 33, the fourth coil set 34, the fifth coil set 35, and the sixth coil set 36 are arranged so as not to overlap. That is, in the circumferential direction, the position of the first coil set 31, the position of the second coil set 32, the position of the third coil set 33, the position of the fourth coil set 34, the position of the fifth coil set 35, and the sixth coil set 36 position is different.

[First embodiment: when the number of slots is 24]
The case where the number of slots 13 of stator core 4 is 24 and the number of coils 5 is 12 will be described below. When n is an integer of 2 or more, the number of slots 13 of the stator core 4 according to the first embodiment satisfies the condition of 12×n.

<Drive circuit>
FIG. 4 is a diagram showing the drive circuit 20 of the motor 1 according to the embodiment. As shown in FIG. 4, the drive circuit 20 includes a U-phase drive section 20U that supplies a current to the U-phase coil 5U, a V-phase drive section 20V that supplies a current to the V-phase coil 5V, and a current to the W-phase coil 5W. and a W-phase driving section 20W that supplies the . U-phase coil 5U and V-phase coil 5V are not connected. V-phase coil 5V and W-phase coil 5W are not connected. W-phase coil 5W and U-phase coil 5U are not connected.

The U-phase drive section 20U has a connection section 21A and a connection section 21B that are connected to the positive side terminal of the power supply section 14, and a connection section 21C and a connection section 21D that are connected to the negative side terminal of the power supply section 14.

Also, the U-phase drive unit 20U has a switching element S connected to each of one end side and the other end side of the U-phase coil 5U. The switching element S includes a first switching element S1, a second switching element S2, a third switching element S3, and a fourth switching element S4. A diode D is connected in parallel to each of the first switching element S1, the second switching element S2, the third switching element S3, and the fourth switching element S4.

Examples of the switching element S include a MOSFET (metal-oxide-semiconductor field-effect transistor) or an IGBT (Insulated Gate Bipolar Transistor). Note that the switching element S may not be a MOSFET or an IGBT.

The first switching element S1 and the third switching element S3 are connected in series between the connection portion 21A and the connection portion 21C. The first switching element S1 is arranged at a position closer to the connection portion 21A than the third switching element S3. The fourth switching element S4 and the second switching element S2 are connected in series between the connection portion 21B and the connection portion 21D. The fourth switching element S4 is arranged at a position closer to the connection portion 21B than the second switching element S2. The first switching element S1 and the third switching element S3, and the fourth switching element S4 and the second switching element S2 are connected in parallel.

In addition, the U-phase drive unit 20U includes a first current input terminal 21i arranged between the first switching element S1 and the third switching element S3, and a current input terminal 21i between the fourth switching element S4 and the second switching element S2. and a current first output end 21o disposed therebetween. One end of U-phase coil 5U is connected to first input end 21i. The other end of U-phase coil 5U is connected to first output end 21o.

The collector terminal of the first switching element S1 is connected to the connection portion 21A. The emitter terminal of the first switching element S1 is connected to each of the collector terminals of the third switching element S3 via the first input end 21i. The emitter terminal of the third switching element S3 is connected to the connection portion 21C.

The collector terminal of the fourth switching element S4 is connected to the connection portion 21B. The emitter terminal of the fourth switching element S4 is connected to the collector terminal of the second switching element S2 via the first output end 21o. The emitter terminal of the second switching element S2 is connected to the connection portion 21D.

The plurality of U-phase coils 5U are connected in series between the first current input end 21i and the first current output end 21o. U-phase coil 5U includes a first U-phase coil 5U1, a second U-phase coil 5U2, a third U-phase coil 5U3, and a fourth U-phase coil 5U4. One end of the first U-phase coil 5U1 is connected to the first input end 21i. The other end of first U-phase coil 5U1 is connected to one end of second U-phase coil 5U2 via connecting wire 24A. The other end of the second U-phase coil 5U2 is connected to one end of the third U-phase coil 5U3 via a connecting wire 24B. The other end of the third U-phase coil 5U3 is connected to one end of the fourth U-phase coil 5U4 via a connecting wire 24C. The other end of the fourth U-phase coil 5U4 is connected to the first output end 21o.

The V-phase drive section 20V has a connection section 22A and a connection section 22B that are connected to the positive side terminal of the power supply section 14, and a connection section 22C and a connection section 22D that are connected to the negative side terminal of the power supply section 14.

Also, the V-phase driving section 20V has a first switching element S1, a second switching element S2, a third switching element S3, and a fourth switching element S4.

In the V-phase drive section 20V, the first switching element S1 and the third switching element S3 are connected in series between the connection section 22A and the connection section 22C. The first switching element S1 is arranged at a position closer to the connecting portion 22A than the third switching element S3. In the V-phase driving section 20V, the fourth switching element S4 and the second switching element S2 are connected in series between the connecting section 22B and the connecting section 22D. The fourth switching element S4 is arranged at a position closer to the connection portion 22B than the second switching element S2.

In addition, the V-phase driving section 20V includes a second current input terminal 22i arranged between the first switching element S1 and the third switching element S3, and a current input terminal 22i between the fourth switching element S4 and the second switching element S2. and a current second output end 22o disposed therebetween. One end of the V-phase coil 5V is connected to the second input end 22i. The other end of the V-phase coil 5V is connected to the second output end 22o.

In the V-phase drive section 20V, the collector terminal of the first switching element S1 is connected to the connection section 22A. The emitter terminal of the first switching element S1 is connected to each of the collector terminals of the third switching element S3 via the second input end 22i. The emitter terminal of the third switching element S3 is connected to the connection portion 22C.

In the V-phase drive section 20V, the collector terminal of the fourth switching element S4 is connected to the connection section 22B. The emitter terminal of the fourth switching element S4 is connected to the collector terminal of the second switching element S2 via the second output end 22o. The emitter terminal of the second switching element S2 is connected to the connection portion 22D.

The plurality of V-phase coils 5V are connected in series between the current second input end 22i and the current second output end 22o. The V-phase coil 5V includes a first V-phase coil 5V1, a second V-phase coil 5V2, a third V-phase coil 5V3, and a fourth V-phase coil 5V4. One end of the first V-phase coil 5V1 is connected to the second input end 22i. The other end of the first V-phase coil 5V1 is connected to one end of the second V-phase coil 5V2 via a connecting wire 25A. The other end of the second V-phase coil 5V2 is connected to one end of the third V-phase coil 5V3 via a connecting wire 25B. The other end of the third V-phase coil 5V3 is connected to one end of the fourth V-phase coil 5V4 via a connecting wire 25C. The other end of the fourth V-phase coil 5V4 is connected to the second output end 22o.

The W-phase drive section 20W has a connection section 23A and a connection section 23B that are connected to the positive side terminal of the power supply section 14, and a connection section 23C and a connection section 23D that are connected to the negative side terminal of the power supply section 14.

Also, the W-phase driving section 20W has a first switching element S1, a second switching element S2, a third switching element S3, and a fourth switching element S4.

In the W-phase drive section 20W, the first switching element S1 and the third switching element S3 are connected in series between the connection section 23A and the connection section 23C. The first switching element S1 is arranged at a position closer to the connection portion 23A than the third switching element S3. In the W-phase driving section 20W, the fourth switching element S4 and the second switching element S2 are connected in series between the connecting section 23B and the connecting section 23D. The fourth switching element S4 is arranged at a position closer to the connection portion 23B than the second switching element S2.

In addition, the W-phase drive unit 20W includes a third current input terminal 23i arranged between the first switching element S1 and the third switching element S3, and a current input terminal 23i between the fourth switching element S4 and the second switching element S2. and a current third output end 23o disposed therebetween. One end of the W-phase coil 5W is connected to the third input end 23i. The other end of the W-phase coil 5W is connected to the third output end 23o.

In the W-phase drive section 20W, the collector terminal of the first switching element S1 is connected to the connection section 23A. The emitter terminal of the first switching element S1 is connected to each of the collector terminals of the third switching element S3 via the third input end 23i. The emitter terminal of the third switching element S3 is connected to the connecting portion 23C.

In the W-phase drive section 20W, the collector terminal of the fourth switching element S4 is connected to the connection section 23B. The emitter terminal of the fourth switching element S4 is connected to the collector terminal of the second switching element S2 via the third output end 23o. The emitter terminal of the second switching element S2 is connected to the connection portion 23D.

The plurality of W-phase coils 5W are connected in series between the current third input end 23i and the current third output end 23o. The W-phase coil 5W includes a first W-phase coil 5W1, a second W-phase coil 5W2, a third W-phase coil 5W3, and a fourth W-phase coil 5W4. One end of the first W-phase coil 5W1 is connected to the third input end 23i. The other end of the first W-phase coil 5W1 is connected to one end of the second W-phase coil 5W2 via a connecting wire 26A. The other end of the second W-phase coil 5W2 is connected to one end of the third W-phase coil 5W3 via a connecting wire 26B. The other end of the third W-phase coil 5W3 is connected to one end of the fourth W-phase coil 5W4 via a connecting wire 26C. The other end of the fourth W-phase coil 5W4 is connected to the third output end 23o.

Each of FIGS. 5 and 6 is a diagram showing an operation example of the U-phase driving section 20U according to the embodiment. The switching element S is turned on or off. In the embodiment, the first switching element S1 and the second switching element S2 are turned on or off at the same time. The third switching element S3 and the fourth switching element S4 are turned on or off at the same time. When the first switching element S1 and the second switching element S2 are turned on, the third switching element S3 and the fourth switching element S4 are turned off. When the first switching element S1 and the second switching element S2 are turned off, the third switching element S3 and the fourth switching element S4 are turned on.

FIG. 5 shows a state in which the first switching element S1 and the second switching element S2 are turned on and the third switching element S3 and the fourth switching element S4 are turned off while the voltage of the connection portion 21A is positive. In the state shown in FIG. 5, a current flows from the connection portion 21A to one end of the U-phase coil 5U via the first switching element S1 and the first input end 21i, and the other end of the U-phase coil 5U to the first current. A current flows through the connection portion 21D through the output end portion 21o and the second switching element S2.

In the state shown in FIG. 5, the voltage at the first input terminal 21i is positive and the voltage at the first output terminal 21o is negative. When the voltage of the connection portion 21A is +V and the voltage of the connection portion 21D is -V, the voltage of the first input terminal 21i is +V/2 and the voltage of the first output terminal 21o is -V/2. 2.

FIG. 6 shows a state in which the voltage of the connection portion 21A is negative, the third switching element S3 and the fourth switching element S4 are turned on, and the first switching element S1 and the second switching element S2 are turned off. In the state shown in FIG. 6, a current flows from the connecting portion 21C through the third switching element S3 and the first input end 21i to one end of the U-phase coil 5U, and the other end of the U-phase coil 5U flows to the first input terminal 21i. A current flows through the connection portion 21B via the output end portion 21o and the fourth switching element S4.

In the state shown in FIG. 6, the voltage at the first input terminal 21i is negative and the voltage at the first output terminal 21o is positive. When the voltage of the connection portion 21C is -V and the voltage of the connection portion 21D is +V, the voltage of the first input terminal 21i is -V/2 and the voltage of the first output terminal 21o is +V/2. 2.

An operation example of the U-phase drive unit 20U has been described above with reference to FIGS. Similarly to the U-phase driver 20U, the voltage at the second input terminal 22i is positive and the voltage at the second output terminal 22o is negative, and the voltage at the second input terminal 22i is negative and the second output The switching element S of the V-phase driving section 20V is controlled so that the voltage of the end portion 22o is positive. The voltage of the third input terminal 23i is positive and the voltage of the third output terminal 23o is negative, and the voltage of the third input terminal 23i is negative and the voltage of the third output terminal 23o is positive. The switching element S of the W-phase driving section 20W is controlled so as to change to a certain state.

In the following description, the state in which the voltage at the input terminals (21i, 22i, 23i) is positive and the voltage at the output terminals (21o, 22o, 23o) is negative, such as the state shown in FIG. , called the first application state, in which the voltage at the input terminals (21i, 22i, 23i) is negative and the voltage at the output terminals (21o, 22o, 23o) is positive, as in the state shown in FIG. A certain state is appropriately referred to as a second application state.

7, 8, and 9 are diagrams schematically showing driving examples of the driving circuit 20 according to the embodiment. When driving the motor 1, each of the U-phase drive section 20U, the V-phase drive section 20V, and the W-phase drive section 20W is controlled to change between the first application state and the second application state.

As shown in FIG. 7, when the switching element S of the U-phase driving section 20U is controlled so that the U-phase driving section 20U is in the second applying state, the V-phase driving section 20V is set in the first applying state. The switching element S of the V-phase driving section 20V is controlled. In U-phase drive unit 20U shown in FIG. 7, the voltage at first input terminal 21i is -V/2, and the voltage between first U-phase coil 5U1 and second U-phase coil 5U2 is -V/4. , the voltage between the second U-phase coil 5U2 and the third U-phase coil 5U3 is 0, the voltage between the third U-phase coil 5U3 and the fourth U-phase coil 5U4 is +V/4, and the first output terminal 21o is +V/2. In the V-phase driving section 20V shown in FIG. 7, the voltage of the second input terminal 22i is +V/2, the voltage between the first V-phase coil 5V1 and the second V-phase coil 5V2 is +V/4, and the The voltage between the 2V-phase coil 5V2 and the 3rd V-phase coil 5V3 is 0, the voltage between the 3rd V-phase coil 5V3 and the 4th V-phase coil 5V4 is -V/4, and the second output terminal 22o is -V/2.

As shown in FIG. 8, when the switching element S of the V-phase drive section 20V is controlled so that the V-phase drive section 20V is in the second application state, the W-phase drive section 20W is set in the first application state. The switching element S of the W-phase driving section 20W is controlled. In the V-phase drive unit 20V shown in FIG. 8, the voltage at the second input terminal 22i is -V/2, and the voltage between the first V-phase coil 5V1 and the second V-phase coil 5V2 is -V/4. , the voltage between the second V-phase coil 5V2 and the third V-phase coil 5V3 is 0, the voltage between the third V-phase coil 5V3 and the fourth V-phase coil 5V4 is +V/4, and the second output terminal 22o is +V/2. In the W-phase drive unit 20W shown in FIG. 8, the voltage at the third input terminal 23i is +V/2, the voltage between the first W-phase coil 5W1 and the second W-phase coil 5W2 is +V/4, and the The voltage between the 2W-phase coil 5W2 and the 3rd W-phase coil 5W3 is 0, the voltage between the 3rd W-phase coil 5W3 and the 4th W-phase coil 5W4 is -V/4, and the third output terminal 23o. is -V/2.

As shown in FIG. 9, when the switching element S of the W-phase driving section 20W is controlled so that the W-phase driving section 20W is in the second application state, the U-phase driving section 20U is set in the first application state. The switching element S of the U-phase driving section 20U is controlled. In the W-phase drive unit 20W shown in FIG. 9, the voltage at the third input terminal 23i is -V/2, and the voltage between the first W-phase coil 5W1 and the second W-phase coil 5W2 is -V/4. , the voltage between the second W-phase coil 5W2 and the third W-phase coil 5W3 is 0, the voltage between the third W-phase coil 5W3 and the fourth W-phase coil 5W4 is +V/4, and the third output terminal The voltage at 23o is +V/2. In U-phase drive unit 20U shown in FIG. 9, the voltage at first input terminal 21i is +V/2, the voltage between first U-phase coil 5U1 and second U-phase coil 5U2 is +V/4, and the voltage between first U-phase coil 5U1 and second U-phase coil 5U2 is +V/4. The voltage between the 2U-phase coil 5U2 and the 3rd U-phase coil 5U3 is 0, the voltage between the 3rd U-phase coil 5U3 and the 4th U-phase coil 5U4 is -V/4, and the first output terminal 21o. is -V/2.

<Coil set>
Each of the plurality of U-phase coils 5U is given an ordinal number (first ordinal number) indicating the order of the U-phase coils 5U from the first input end 21i. The longer the distance (electrical distance) from the first input end 21i to the U-phase coil 5U, the larger the given ordinal number. The first U-phase coil 5U1 is the first U-phase coil 5U from the first input end 21i. The second U-phase coil 5U2 is the second U-phase coil 5U from the first input end 21i. The third U-phase coil 5U3 is the third U-phase coil 5U from the first input end 21i. The fourth U-phase coil 5U4 is the fourth U-phase coil 5U from the first input end 21i.

An ordinal number (second ordinal number) indicating the order of the V-phase coils 5V from the second input end 22i is given to each of the plurality of V-phase coils 5V. The longer the distance (electrical distance) from the second input end 22i to the V-phase coil 5V, the greater the given ordinal number. The first V-phase coil 5V1 is the first V-phase coil 5V from the second input end 22i. The second V-phase coil 5V2 is the second V-phase coil 5V from the second input end 22i. The third V-phase coil 5V3 is the third V-phase coil 5V from the second input end 22i. The fourth V-phase coil 5V4 is the fourth V-phase coil 5V from the second input end 22i.

An ordinal number (third ordinal number) indicating the order of the W-phase coils 5W from the third input end 23i is given to each of the plurality of W-phase coils 5W. The longer the distance (electrical distance) from the third input end 23i to the W-phase coil 5W, the larger the given ordinal number. The first W-phase coil 5W1 is the first W-phase coil 5W from the third input end 23i. The second W-phase coil 5W2 is the second W-phase coil 5W from the third input end 23i. The third W-phase coil 5W3 is the third W-phase coil 5W from the third input end 23i. The fourth W-phase coil 5W4 is the fourth W-phase coil 5W from the third input end 23i.

The distance (electrical distance) from the input ends (21i, 22i, 23i) to the coils 5 (5U, 5V, 5W) means that the input ends (21i, 22i, 23i) to the coils 5 (5U, 5V) , 5W).

FIG. 10 is a perspective view showing the coil set 30 supported by the stator core 4 according to the embodiment. FIG. 11 is a diagram for explaining the coils 5 forming the coil set 30 according to the embodiment.

As shown in FIGS. 10 and 11, a plurality of coil sets 30 are formed by a plurality of U-phase coils 5U, a plurality of V-phase coils 5V, and a plurality of W-phase coils 5W.

The ordinal number (first ordinal number) of the U-phase coil 5U from the first input end 21i forming the coil set 30 and the ordinal number (second ordinal number) of the V-phase coil 5V from the second input end 22i are different. .

The ordinal number (second ordinal number) of the V-phase coil 5V from the second input end portion 22i forming the coil set 30 and the ordinal number (third ordinal number) of the W-phase coil 5W from the third input end portion 23i are different. .

The ordinal number (third ordinal number) of the W-phase coil 5W from the third input end portion 23i forming the coil set 30 and the ordinal number (first ordinal number) of the U-phase coil 5U from the first input end portion 21i are different. .

A first coil set 31 is formed by a first U-phase coil 5U1 that is first from the first input end 21i and a fourth V-phase coil 5V4 that is fourth from the second input end 22i. The fourth V-phase coil 5V4 is arranged so as to partially overlap the first U-phase coil 5U1. The sum of the ordinal number (first) of the first U-phase coil 5U1 and the ordinal number (fourth) of the fourth V-phase coil 5V4 is five.

A second coil set 32 is formed by a first V-phase coil 5V1 that is first from the second input end 22i and a fourth W-phase coil 5W4 that is fourth from the third input end 23i. The fourth W-phase coil 5W4 is arranged so as to partially overlap the first V-phase coil 5V1. The sum of the ordinal number (first) of the first V-phase coil 5V1 and the ordinal number (fourth) of the fourth W-phase coil 5W4 is five.

A third coil set 33 is formed by the first W-phase coil 5W1 that is first from the third input end 23i and the fourth U-phase coil 5U4 that is fourth from the first input end 21i. The fourth U-phase coil 5U4 is arranged so as to partially overlap the first V-phase coil 5V1. The sum of the ordinal number (first) of the first W-phase coil 5W1 and the ordinal number (fourth) of the fourth U-phase coil 5U4 is five.

A fourth coil set 34 is formed by a third U-phase coil 5U3 that is third from the first input end 21i and a second V-phase coil 5V2 that is second from the second input end 22i. The second V-phase coil 5V2 is arranged so as to partially overlap the third U-phase coil 5U3. The sum of the ordinal number (third) of the third U-phase coil 5U3 and the ordinal number (second) of the second V-phase coil 5V2 is five.

A fifth coil set 35 is formed by a third V-phase coil 5V3 that is third from the second input end 22i and a second W-phase coil 5W2 that is second from the third input end 23i. The second W-phase coil 5W2 is arranged so as to partially overlap the third V-phase coil 5V3. The sum of the ordinal number (third) of the third V-phase coil 5V3 and the ordinal number (second) of the second W-phase coil 5W2 is five.

A sixth coil set 36 is formed by a third W-phase coil 5W3 that is third from the third input end 23i and a second U-phase coil 5U2 that is second from the first input end 21i. The second U-phase coil 5U2 is arranged so as to partially overlap the third W-phase coil 5W3. The sum of the ordinal number (third) of the third W-phase coil 5W3 and the ordinal number (second) of the second U-phase coil 5U2 is five.

In this way, the sum of the ordinals of the first coil set 31, the sum of the ordinals of the second coil set 32, the sum of the ordinals of the third coil set 33, the sum of the ordinals of the fourth coil set 34, and the sum of the ordinals of the fifth coil set 35 The sum of the ordinal numbers and the sum of the ordinal numbers of the sixth coil set 36 are both five. That is, the sums of the ordinal numbers of the multiple coil sets 30 (31, 32, 33, 34, 35, 36) are equal to each other.

[Second embodiment: when the number of slots is 36]
Next, the case where the number of slots 13 of stator core 4 is 36 and the number of coils 5 is 18 will be described. When n is an integer of 2 or more, the number of slots 13 of the stator core 4 according to the second embodiment satisfies the condition of 12×n.

<Drive circuit>
FIG. 12 is a diagram schematically showing a drive example of the drive circuit 20 according to the embodiment. In the embodiment, 18 coils 5 are provided. Six U-phase coils 5U are provided. Six V-phase coils 5V are provided. Six W-phase coils 5W are provided.

The six U-phase coils 5U are connected in series between the first current input end 21i and the first current output end 21o. The U-phase coil 5U includes a first U-phase coil 5U1 that is first from the first input end portion 21i, a second U-phase coil 5U2 that is second, a third U-phase coil 5U3 that is third, and a fourth U-phase coil that is fourth. 5U4, a fifth fifth U-phase coil 5U5, and a sixth sixth U-phase coil 5U6.

The six V-phase coils 5V are connected in series between the current second input end 22i and the current second output end 22o. The V-phase coil 5V includes a first V-phase coil 5V1 that is first from the second input end 22i, a second V-phase coil 5V2 that is second, a third V-phase coil 5V3 that is third, and a fourth V-phase coil that is fourth from the second input end 22i. 5V4, a fifth fifth V-phase coil 5V5, and a sixth sixth V-phase coil 5V6.

The six W-phase coils 5W are connected in series between the current third input end 23i and the current third output end 23o. The W-phase coil 5W includes a first W-phase coil 5W1 that is first from the third input end 23i, a second W-phase coil 5W2 that is second, a third W-phase coil 5W3 that is third, and a fourth W-phase coil that is fourth from the third input end 23i. 5W4, 5th 5th W-phase coil 5W5, and 6th 6th W-phase coil 5W6.

As shown in FIG. 12, when the switching element S of the U-phase driving section 20U is controlled so that the U-phase driving section 20U is in the second applying state, the V-phase driving section 20V is set in the first applying state. The switching element S of the V-phase driving section 20V is controlled. In U-phase drive unit 20U shown in FIG. 12, the voltage at first input terminal 21i is -V/2, and the voltage between first U-phase coil 5U1 and second U-phase coil 5U2 is -V/3. , the voltage between the 2nd U-phase coil 5U2 and the 3rd U-phase coil 5U3 is −V/6, the voltage between the 3rd U-phase coil 5U3 and the 4th U-phase coil 5U4 is 0, and the 4th U-phase coil The voltage between 5U4 and the 5th U-phase coil 5U5 is +V/6, the voltage between the 5th U-phase coil 5U5 and the 6th U-phase coil 5U6 is +V/3, and the voltage at the first output terminal 21o is +V. /2. In the V-phase driving section 20V shown in FIG. 12, the voltage of the second input terminal 22i is +V/2, the voltage between the first V-phase coil 5V1 and the second V-phase coil 5V2 is +V/3, and the The voltage between the 2V-phase coil 5V2 and the 3rd V-phase coil 5V3 is +V/6, the voltage between the 3rd V-phase coil 5V3 and the 4th V-phase coil 5V4 is 0, and the voltage between the 4th V-phase coil 5V4 and the 4th V-phase coil 5V4 is +V/6. The voltage between the 5V-phase coil 5V5 is −V/6, the voltage between the 5th V-phase coil 5V5 and the 6th V-phase coil 5V6 is −V/3, and the voltage at the second output terminal 22o is -V/2.

When the switching element S of the V-phase drive section 20V is controlled so that the V-phase drive section 20V is in the second application state, the W-phase drive section 20W is switched so that the W-phase drive section 20W is in the first application state. is controlled. When the switching element S of the W-phase driving section 20W is controlled so that the W-phase driving section 20W is in the second application state, switching of the U-phase driving section 20U is performed so that the U-phase driving section 20U is in the first application state. Element S is controlled.

<Coil set>
FIG. 13 is a perspective view showing the coil set 30 supported by the stator core 4 according to the embodiment. FIG. 14 is a diagram for explaining the coils 5 forming the coil set 30 according to the embodiment.

In the embodiment, the stator core 4 is provided with 36 slots 13 . A plurality of coil sets 30 are formed by a plurality of U-phase coils 5U, a plurality of V-phase coils 5V, and a plurality of W-phase coils 5W.

A first coil set 31 is formed by a first U-phase coil 5U1 that is first from the first input end 21i and a sixth V-phase coil 5V6 that is sixth from the second input end 22i. The sum of the ordinal number (first) of the first U-phase coil 5U1 and the ordinal number (sixth) of the sixth V-phase coil 5V6 is seven.

A second coil set 32 is formed by a first V-phase coil 5V1 that is first from the second input end 22i and a sixth W-phase coil 5W6 that is sixth from the third input end 23i. The sum of the ordinal number (first) of the first V-phase coil 5V1 and the ordinal number (sixth) of the sixth W-phase coil 5W6 is seven.

A third coil set 33 is formed by the 1st W-phase coil 5W1 that is the first from the third input end 23i and the 6th U-phase coil 5U6 that is the sixth from the first input end 21i. The sum of the ordinal number (first) of the first W-phase coil 5W1 and the ordinal number (sixth) of the sixth U-phase coil 5U6 is seven.

A fourth coil set 34 is formed by a fifth U-phase coil 5U5 that is fifth from the first input end 21i and a second V-phase coil 5V2 that is second from the second input end 22i. The sum of the ordinal number (5th) of the fifth U-phase coil 5U5 and the ordinal number (2nd) of the second V-phase coil 5V2 is seven.

A fifth coil set 35 is formed by a third V-phase coil 5V3 that is third from the second input end 22i and a fourth W-phase coil 5W4 that is fourth from the third input end 23i. The sum of the ordinal number (third) of the third V-phase coil 5V3 and the ordinal number (fourth) of the fourth W-phase coil 5W4 is seven.

A sixth coil set 36 is formed by a third W-phase coil 5W3 that is third from the third input end 23i and a fourth U-phase coil 5U4 that is fourth from the first input end 21i. The sum of the ordinal number (third) of the third W-phase coil 5W3 and the ordinal number (fourth) of the fourth U-phase coil 5U4 is seven.

A seventh coil set 37 is formed by a third U-phase coil 5U3 that is third from the first input end 21i and a fourth V-phase coil 5V4 that is fourth from the second input end 22i. The sum of the ordinal number (third) of the third U-phase coil 5U3 and the ordinal number (fourth) of the fourth V-phase coil 5V4 is seven.

An eighth coil set 38 is formed by a fifth V-phase coil 5V5 that is fifth from the second input end 22i and a second W-phase coil 5W2 that is second from the third input end 23i. The sum of the ordinal number (5th) of the fifth V-phase coil 5V5 and the ordinal number (2nd) of the second W-phase coil 5W2 is seven.

A ninth coil set 39 is formed by a fifth W-phase coil 5W5 that is fifth from the third input end 23i and a second U-phase coil 5U2 that is second from the first input end 21i. The sum of the ordinal number (5th) of the fifth W-phase coil 5W5 and the ordinal number (2nd) of the second U-phase coil 5U2 is seven.

In this way, the sum of the ordinals of the first coil set 31, the sum of the ordinals of the second coil set 32, the sum of the ordinals of the third coil set 33, the sum of the ordinals of the fourth coil set 34, and the sum of the ordinals of the fifth coil set 35 The sum of the ordinal numbers, the sum of the ordinal numbers of the sixth coil set 36, the sum of the ordinal numbers of the seventh coil set 37, the sum of the ordinal numbers of the eighth coil set 38, and the sum of the ordinal numbers of the ninth coil set 39 are all 7. be. That is, the sum of the ordinal numbers of the multiple coil sets 30 (31, 32, 33, 34, 35, 36, 37, 38, 39) is equal to each other.

[Third embodiment: when the number of slots is 48]
Next, the case where the number of slots 13 of stator core 4 is 48 and the number of coils 5 is 24 will be described. When n is an integer of 2 or more, the number of slots 13 of the stator core 4 according to the third embodiment satisfies the condition of 12×n.

<Drive circuit>
FIG. 15 is a diagram schematically showing a drive example of the drive circuit 20 according to the embodiment. In the embodiment, 24 coils 5 are provided. Eight U-phase coils 5U are provided. Eight V-phase coils 5V are provided. Eight W-phase coils 5W are provided.

The eight U-phase coils 5U are connected in series between the first current input end 21i and the first current output end 21o. The U-phase coil 5U includes a first U-phase coil 5U1 that is first from the first input end portion 21i, a second U-phase coil 5U2 that is second, a third U-phase coil 5U3 that is third, and a fourth U-phase coil that is fourth. 5U4, 5th 5th U-phase coil 5U5, 6th 6th U-phase coil 5U6, 7th 7th U-phase coil 5U7, and 8th 8th U-phase coil 5U8.

The eight V-phase coils 5V are connected in series between the current second input end 22i and the current second output end 22o. The V-phase coil 5V includes a first V-phase coil 5V1 that is first from the second input end 22i, a second V-phase coil 5V2 that is second, a third V-phase coil 5V3 that is third, and a fourth V-phase coil that is fourth from the second input end 22i. 5V4, a fifth fifth V-phase coil 5V5, a sixth sixth V-phase coil 5V6, a seventh seventh V-phase coil 5V7, and an eighth eighth V-phase coil 5V8.

The eight W-phase coils 5W are connected in series between the current third input end 23i and the current third output end 23o. The W-phase coil 5W includes a first W-phase coil 5W1 that is first from the third input end 23i, a second W-phase coil 5W2 that is second, a third W-phase coil 5W3 that is third, and a fourth W-phase coil that is fourth from the third input end 23i. 5W4, 5th 5W-phase coil 5W5, 6th 6th W-phase coil 5W6, 7th 7th W-phase coil 5W7, and 8th 8th W-phase coil 5W8.

As shown in FIG. 15, when the switching element S of the U-phase driving section 20U is controlled so that the U-phase driving section 20U is in the second application state, the V-phase driving section 20V is set in the first application state. The switching element S of the V-phase driving section 20V is controlled. In U-phase drive unit 20U shown in FIG. 15, the voltage at first input terminal 21i is -V/2, and the voltage between first U-phase coil 5U1 and second U-phase coil 5U2 is -3V/8. , the voltage between the second U-phase coil 5U2 and the third U-phase coil 5U3 is −V/4, the voltage between the third U-phase coil 5U3 and the fourth U-phase coil 5U4 is −V/8, and the The voltage between the 4U-phase coil 5U4 and the 5th U-phase coil 5U5 is 0, the voltage between the 5th U-phase coil 5U5 and the 6th U-phase coil 5U6 is +V/8, and the voltage between the 6th U-phase coil 5U6 and the 7th U-phase coil is +V/8. The voltage across the coil 5U7 is +V/4, the voltage across the 7th U-phase coil 5U7 and the 8th U-phase coil 5U8 is +3V/8, and the voltage at the first output terminal 21o is +V/2. In the V-phase driving section 20V shown in FIG. 15, the voltage of the second input terminal 22i is +V/2, the voltage between the first V-phase coil 5V1 and the second V-phase coil 5V2 is +3V/8, and the The voltage between the 2V-phase coil 5V2 and the 3rd V-phase coil 5V3 is +V/4, the voltage between the 3rd V-phase coil 5V3 and the 4th V-phase coil 5V4 is +V/8, and the 4th V-phase coil 5V4 and the fifth V-phase coil 5V5 is 0, the voltage between the fifth V-phase coil 5V5 and the sixth V-phase coil 5V6 is -V/8, the sixth V-phase coil 5V6 and the seventh V-phase coil 5V7 is −V/4, the voltage between the seventh V-phase coil 5V7 and the eighth V-phase coil 5V8 is −3V/8, and the voltage at the second output terminal 22o is −V/4. 2.

When the switching element S of the V-phase drive section 20V is controlled so that the V-phase drive section 20V is in the second application state, the W-phase drive section 20W is switched so that the W-phase drive section 20W is in the first application state. is controlled. When the switching element S of the W-phase driving section 20W is controlled so that the W-phase driving section 20W is in the second application state, switching of the U-phase driving section 20U is performed so that the U-phase driving section 20U is in the first application state. Element S is controlled.

<Coil set>
FIG. 16 is a perspective view showing the coil set 30 supported by the stator core 4 according to the embodiment. FIG. 17 is a diagram for explaining the coils 5 forming the coil set 30 according to the embodiment.

In the embodiment, the stator core 4 is provided with 48 slots 13 . A plurality of coil sets 30 are formed by a plurality of U-phase coils 5U, a plurality of V-phase coils 5V, and a plurality of W-phase coils 5W.

A first coil set 31 is formed by the 1st U-phase coil 5U1 that is the first from the first input end 21i and the 8th V-phase coil 5V8 that is the eighth from the second input end 22i. The sum of the ordinal number (first) of the first U-phase coil 5U1 and the ordinal number (eighth) of the eighth V-phase coil 5V8 is nine.

A second coil set 32 is formed by the first V-phase coil 5V1 that is first from the second input end 22i and the eighth W-phase coil 5W8 that is eighth from the third input end 23i. The sum of the ordinal number (first) of the first V-phase coil 5V1 and the ordinal number (eighth) of the eighth W-phase coil 5W8 is nine.

A third coil set 33 is formed by the 1st W-phase coil 5W1 that is the first from the third input end 23i and the 8th U-phase coil 5U8 that is the eighth from the first input end 21i. The sum of the ordinal number (first) of the first W-phase coil 5W1 and the ordinal number (eighth) of the eighth U-phase coil 5U8 is nine.

A fourth coil set 34 is formed by a seventh U-phase coil 5U7 that is seventh from the first input end 21i and a second V-phase coil 5V2 that is second from the second input end 22i. The sum of the ordinal number (seventh) of the seventh U-phase coil 5U7 and the ordinal number (second) of the second V-phase coil 5V2 is nine.

A fifth coil set 35 is formed by a third V-phase coil 5V3 that is third from the second input end 22i and a sixth W-phase coil 5W6 that is sixth from the third input end 23i. The sum of the ordinal number (third) of the third V-phase coil 5V3 and the ordinal number (sixth) of the sixth W-phase coil 5W6 is nine.

A sixth coil set 36 is formed by a third W-phase coil 5W3 that is third from the third input end 23i and a sixth U-phase coil 5U6 that is sixth from the first input end 21i. The sum of the ordinal number (third) of the third W-phase coil 5W3 and the ordinal number (sixth) of the sixth U-phase coil 5U6 is nine.

A seventh coil set 37 is formed by a fifth U-phase coil 5U5 that is fifth from the first input end 21i and a fourth V-phase coil 5V4 that is fourth from the second input end 22i. The sum of the ordinal number (fifth) of the fifth U-phase coil 5U5 and the ordinal number (fourth) of the fourth V-phase coil 5V4 is nine.

An eighth coil set 38 is formed by a fifth V-phase coil 5V5 that is fifth from the second input end 22i and a fourth W-phase coil 5W4 that is fourth from the third input end 23i. The sum of the ordinal number (fifth) of the fifth V-phase coil 5V5 and the ordinal number (fourth) of the fourth W-phase coil 5W4 is nine.

A ninth coil set 39 is formed by a fifth W-phase coil 5W5 that is fifth from the third input end 23i and a fourth U-phase coil 5U4 that is fourth from the first input end 21i. The sum of the ordinal number (fifth) of the fifth W-phase coil 5W5 and the ordinal number (fourth) of the fourth U-phase coil 5U4 is nine.

A tenth coil set 310 is formed by a third U-phase coil 5U3 that is third from the first input end 21i and a sixth V-phase coil 5V6 that is sixth from the second input end 22i. The sum of the ordinal number (third) of the third U-phase coil 5U3 and the ordinal number (sixth) of the sixth V-phase coil 5V6 is nine.

An eleventh coil set 311 is formed by a seventh V-phase coil 5V7 that is seventh from the second input end 22i and a second W-phase coil 5W2 that is second from the third input end 23i. The sum of the ordinal number (7th) of the seventh V-phase coil 5V7 and the ordinal number (2nd) of the second W-phase coil 5W2 is nine.

A 12th coil set 312 is formed by a seventh W-phase coil 5W7 that is seventh from the third input end 23i and a second U-phase coil 5U2 that is second from the first input end 21i. The sum of the ordinal number (seventh) of the seventh W-phase coil 5W7 and the ordinal number (second) of the second U-phase coil 5U2 is nine.

In this way, the sum of the ordinals of the first coil set 31, the sum of the ordinals of the second coil set 32, the sum of the ordinals of the third coil set 33, the sum of the ordinals of the fourth coil set 34, and the sum of the ordinals of the fifth coil set 35 Sum of ordinal numbers of sixth coil set 36 Sum of ordinal numbers of seventh coil set 37 Sum of ordinal numbers of eighth coil set 38 Sum of ordinal numbers of ninth coil set 39 Sum of ordinal numbers of tenth coil set 310 The sum of the ordinal numbers, the sum of the ordinal numbers of the 11th coil set 311, and the sum of the ordinal numbers of the 12th coil set 312 are all 9. That is, the sum of the ordinal numbers of the multiple coil sets 30 (31, 32, 33, 34, 35, 36, 37, 38, 39, 310, 311, 312) is equal to each other.

[Relationship between the number of coils and the sum of ordinal numbers]
In the first embodiment described above, the sum of the ordinals of the plurality of coil sets 30 (31, 32, 33, 34, 35, 36) is 5. Also, the number of U-phase coils 5U, the number of V-phase coils 5V, and the number of W-phase coils 5W are equal. The number of U-phase coils 5U is four. The number of V-phase coils 5V and the number of W-phase coils 5W are also four.

In the second embodiment described above, the sum of the ordinal numbers of the plurality of coil sets 30 (31, 32, 33, 34, 35, 36, 37, 38, 39) is 7. Also, the number of U-phase coils 5U, the number of V-phase coils 5V, and the number of W-phase coils 5W are equal. The number of U-phase coils 5U is six. The number of V-phase coils 5V and the number of W-phase coils 5W are also six.

In the third embodiment described above, the sum of the ordinals of the plurality of coil sets 30 (31, 32, 33, 34, 35, 36, 37, 38, 39, 310, 311, 312) is 9 is. Also, the number of U-phase coils 5U, the number of V-phase coils 5V, and the number of W-phase coils 5W are equal. The number of U-phase coils 5U is eight. The number of V-phase coils 5V and the number of W-phase coils 5W are also eight.

In each of the first, second, and third embodiments, when the number of U-phase coils 5U is Nc and the sum of the ordinal numbers of the plurality of coil sets 30 is S, the following (1 ) is satisfied.

　S=Nc+1...(1)

[effect]
As described above, according to the embodiment, since the ordinal number of the first coil 5 and the ordinal number of the second coil 5 forming one coil set 30 are different, the first coil 5 and the second coil The potential difference with 5 becomes smaller. Since the potential difference between the first coil 5 and the second coil 5 is small, dielectric breakdown of the coil 5 is suppressed.

For example, in the first embodiment, when forming the first coil set 31, the V-phase coil 5V to be combined with the first U-phase coil 5U1 having the first ordinal number is not the first V-phase coil 5V1 having the first ordinal number, It is the fourth V-phase coil 5V4 with the fourth ordinal number. As described with reference to FIGS. 5, 6, and 7, the state of voltage application to U-phase coil 5U and the state of voltage application to V-phase coil 5V are different. When the voltage is applied to the U-phase coil 5U in the second application state, the voltage is applied to the V-phase coil 5V in the first application state. In the example shown in FIG. 7, the potential difference between the first U-phase coil 5U1 and the fourth V-phase coil 5V4 is V/4. On the other hand, the potential difference between the first U-phase coil 5U1 and the first V-phase coil 5V1 is V. Therefore, if the first coil set 31 is formed of the first U-phase coil 5U1 and the first V-phase coil 5V1, the potential difference between the two coils 5 forming the first coil set 31 increases. The physical distance between the two coils 5 forming one coil set 30 is short. Therefore, if the potential difference between the two coils 5 forming one coil set 30 is large, the possibility of dielectric breakdown of the coils 5 increases.

In the first embodiment, when forming the first coil set 31, the V-phase coil 5V combined with the first U-phase coil 5U1 having the first ordinal number is not the first V-phase coil 5V1 having the first ordinal number, but the first V-phase coil 5V1 having the first ordinal number. is the fourth fourth V-phase coil 5V4, the potential difference between the two coils 5 forming the first coil set 31 is reduced. Since the potential difference between the two coils 5 forming one coil set 30 is small, dielectric breakdown of the coils 5 is suppressed. The same applies to the second coil set 32 to the sixth coil set 36 .

In the second embodiment, for example, the first coil set 31 is formed of a first U-phase coil 5U1 with the first ordinal number and a sixth V-phase coil 5V6 with the sixth ordinal number. The potential difference between the first U-phase coil 5U1 and the sixth V-phase coil 5V6 is V/6. If the first coil set 31 is formed of the first U-phase coil 5U1 and the first V-phase coil 5V1, the potential difference between the first U-phase coil 5U1 and the first V-phase coil 5V1 is V. As described above, also in the second embodiment, since the potential difference between the two coils 5 forming one coil set 30 is small, dielectric breakdown of the coils 5 is suppressed. The same applies to the second coil set 32 to the ninth coil set 39 .

In the third embodiment, for example, the first coil set 31 is formed of the first U-phase coil 5U1 with the first ordinal number and the eighth V-phase coil 5V8 with the eighth ordinal number. The potential difference between the first U-phase coil 5U1 and the eighth V-phase coil 5V8 is V/8. If the first coil set 31 is formed of the first U-phase coil 5U1 and the first V-phase coil 5V1, the potential difference between the first U-phase coil 5U1 and the first V-phase coil 5V1 is V. As described above, also in the third embodiment, since the potential difference between the two coils 5 forming one coil set 30 is small, dielectric breakdown of the coils 5 is suppressed. The same applies to the second coil set 32 to the twelfth coil set 312 .

Also, in the embodiment, since the potential difference between the two coils 5 forming one coil set 30 is small, dielectric breakdown of the coils 5 is suppressed without thickening the insulating film covering the coils 5 . If the insulating film covering the coil 5 is thin, the size of the coil 5 is suppressed. Since the increase in size of the coil 5 is suppressed, the increase in size of the stator 2 is suppressed.

In each of the first, second, and third embodiments, the sum of the ordinal numbers of the multiple coil sets 30 is equal to each other. This reduces the potential difference between the two coils 5 forming each of the plurality of coil sets 30 .

In each of the first, second, and third embodiments, when Nc is the number of each of the U-phase coils 5U, V-phase coils 5V, and W-phase coils 5W, and S is the sum of the ordinal numbers , satisfies the above equation (1). This reduces the potential difference between the two coils 5 forming each of the plurality of coil sets 30 .

In each of the first, second, and third embodiments, the number of slots 13 in the stator core 4 satisfies the condition of 12×n, where n is an integer of 2 or more. As a result, the stator 2 having the coils 5 supported by the stator core 4 with a two-slot pitch distributed winding is formed.

[Other embodiments]
In the above-described embodiment, the motor 1 is of the inner rotor type in which the rotor 3 is arranged inside the stator core 4 . The rotor 3 may be arranged at a position facing the stator core 4 . The motor 1 may be an outer rotor type in which the rotor 3 is arranged outside the stator core 4 , or a dual rotor type in which the rotor 3 is arranged both inside and outside the stator core 4 . An axial gap type arranged on the direction side may also be used.

In the above embodiment, the motor 1 is a switched reluctance motor. The motor 1 may be a synchronous reluctance motor, a flux switching motor, a permanent magnet motor, or an induction motor. However, it may be an axial gap motor or a linear actuator.

　In the above-described embodiment, the motor 1 is a three-phase motor. Motor 1 may be a four-phase motor.

Reference Signs List 1 motor 2 stator 3 rotor 4 stator core 4A end surface 4B end surface 4S inner surface 4T outer surface 5 coil 5i inner coil 5o outer coil 5U U phase Coils 5Uo... Outer U-phase coil 5Ui... Inner U-phase coil 5U1... 1st U-phase coil 5U2... 2nd U-phase coil 5U3... 3rd U-phase coil 5U4... 4th U-phase coil 5U5... 5th U-phase coil , 5U6... 6th U-phase coil, 5U7... 7th U-phase coil, 5U8... 8th U-phase coil, 5V... V-phase coil, 5Vo... outer V-phase coil, 5Vi... inner V-phase coil, 5V1... first V-phase coil, 5V2 ... 2nd V-phase coil, 5V3 ... 3rd V-phase coil, 5V4 ... 4th V-phase coil, 5V5 ... 5th V-phase coil, 5V6 ... 6th V-phase coil, 5V7 ... 7th V-phase coil, 5V8 ... 8th V-phase coil, 5W ... W-phase coil 5Wo... Outer W-phase coil 5Wi... Inner W-phase coil 5W1... First W-phase coil 5W2... Second W-phase coil 5W3... Third W-phase coil 5W4... Fourth W-phase coil 5W5... Fifth W Phase coil 5W6... 6th W-phase coil 5W7... 7th W-phase coil 5W8... 8th W-phase coil 6... rotor holder 7... rotor core 8... rotor shaft 9... yoke 10... teeth 11... mounting teeth, 12 Non-attached teeth 13 Slot 13A Opening 13B Outer end face 14 Power supply unit 15 Coil body 16 Coil end 20 Drive circuit 20U U-phase drive unit 20V V-phase drive section 20W W-phase drive section 21A Connection section 21B Connection section 21C Connection section 21D Connection section 21i First input terminal 21o First output terminal 22A Connection part 22B... Connection part 22C... Connection part 22D... Connection part 22i... Second input end 22o... Second output end 23A... Connection part 23B... Connection part 23C... Connection part 23D 23i Third input end 23o Third output end 24A Crossover 24B Crossover 24C Crossover 25A Crossover 25B Crossover 25C Crossover 26A... Crossover wire 26B... Crossover wire 26C... Crossover wire 30... Coil set 31... First coil set 32... Second coil set 33... Third coil set 34... Fourth coil set 35... 5th coil set 36... 6th coil set 37... 7th coil set 38... 8th coil set 39... 9th coil set 310... 10th coil set 311... 11th coil set 312... th 12 coil sets 131 first slot 132 second slot 151 first coil body 152 second coil body 161 first coil end 162 second coil end AX Axis of rotation, D... Diode, RS... Object, S... Switching element, S1... First switching element, S2... Second switching element, S3... Third switching element, S4... Fourth switching element.

Claims (5)

1. a stator core;
   a plurality of first-phase coils supported by the stator core at a two-slot pitch;
   a plurality of second phase coils supported by the stator core at a two-slot pitch,
   The plurality of first phase coils are connected in series between a first input end and a first output end of current,
   the plurality of second phase coils are connected in series between a second input end and a second output end of current;
   A first ordinal number indicating an order from the first input end is given to each of the plurality of first phase coils,
   A second ordinal number indicating an order from the second input end is given to each of the plurality of second phase coils,
   One coil set is formed by one of the first phase coils and one of the second phase coils arranged to partially overlap the one of the first phase coils,
   The first ordinal number of the first phase coil and the second ordinal number of the second phase coil forming the coil set are different,
   stator.
2. A plurality of coil sets are formed by a plurality of the first phase coils and a plurality of the second phase coils,
   sums of the first ordinal number and the second ordinal number of each of the plurality of coil sets are equal to each other;
   A stator according to claim 1 .
3. comprising a plurality of third-phase coils supported by the stator core at a two-slot pitch;
   The number of the first phase coils, the number of the second phase coils, and the number of the third phase coils are equal,
   When the number of the first phase coils is Nc and the sum is S,
   S=Nc+1,
   satisfy the conditions of
   3. A stator according to claim 2.
4. When n is an integer of 2 or more, the number of slots of the stator core satisfies the condition of 12 × n.
   A stator according to any one of claims 1 to 3.
5. a stator according to any one of claims 1 to 4;
   a rotor facing the stator core,
   motor.

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