WO2024127556A1

WO2024127556A1 - Motor device

Info

Publication number: WO2024127556A1
Application number: PCT/JP2022/046058
Authority: WO
Inventors: 裕人佐藤
Original assignee: 株式会社ジェイテクト
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2024-06-20

Abstract

A motor device (11) has a motor (12) and a circuit board (51). The motor (12) includes a rotor (30), a stator (40), and a housing (21) that houses the rotor (30) and the stator (40). The stator (40) comprises at least one winding group (41A, 41B) including a 3-phase set comprising a U-phase winding, a V-phase winding, and a W-phase winding. The 3-phase windings each have an input terminal and an end terminal which are led out from the stator (40) to the outside of the housing (21). The input terminals of the 3-phase windings are electrically connected to the circuit board (51), thereby being connected to a drive current power supply. The end terminals of the 3-phase windings are electrically connected to the circuit board (51), thereby forming the neutral point (NA, NB) of the winding group (41A, 41B).

Description

Motor device

This disclosure relates to a motor device.

For example, as described in Patent Document 1, there is a motor device having a motor and a circuit board. The circuit board supplies a drive current to the motor through a U-phase winding, a V-phase winding, and a W-phase winding. As described in Patent Document 2, the U-phase winding, the V-phase winding, and the W-phase winding are mounted on a stator. One ends of the U-phase winding, the V-phase winding, and the W-phase winding mounted on the stator are welded together to form a neutral point. In other words, the connection method of the U-phase winding, the V-phase winding, and the W-phase winding mounted on the stator is a star connection (Y connection).

JP 2020-004887 A JP 2022-012947 A

In a star connection like that in Patent Document 2, welding or the like must be performed to prevent the neutral point from being easily released. Also, the stator is housed in the motor housing after the neutral point is formed by welding or the like. In other words, a process of forming the neutral point by welding or the like is essential before housing the stator in the housing.

A motor device according to one aspect of the present disclosure includes a motor and a circuit board configured to supply a drive current to the motor. The motor includes a rotor, a stator arranged around the rotor, and a housing that accommodates the rotor and the stator. The stator includes at least one winding group including a three-phase set consisting of a U-phase winding, a V-phase winding, and a W-phase winding. Each of the three-phase windings has an input end and a terminal end that are drawn out from the stator to the outside of the housing. The input end of the three-phase windings is electrically connected to the circuit board and is thereby connected to a power source for the drive current, and the terminal end of the three-phase windings is electrically connected to the circuit board to form a neutral point in the winding group.

1 is an exploded perspective view of a motor device according to a first embodiment; FIG. 2 is a connection diagram of the windings of the motor of FIG. 1. FIG. 2 is a circuit diagram of the circuit board of FIG. 1 . FIG. 2 is a plan view of the motor device of FIG. 1 with the cover removed. 2 is a diagram for explaining a method of connecting the circuit board and windings in FIG. 1 . FIG. FIG. 6 is a diagram showing a cross-sectional structure of FIG. 5 . 13A to 13C are diagrams illustrating a method of connecting a circuit board and a winding according to a second embodiment. FIG. 8 is a diagram showing a cross-sectional structure of FIG. 7 . 13A to 13C are diagrams illustrating a method of connecting a circuit board and a winding according to another embodiment. FIG. 13 is a diagram illustrating a motor device according to another embodiment.

First Embodiment
Hereinafter, a motor device according to a first embodiment will be described with reference to the drawings.
As shown in Fig. 1, the motor device 11 is a mechanically and electrically integrated motor device in which a motor 12 and a motor control device 13 are integrated. The motor 12 is, for example, a three-phase brushless motor. The three phases are a U phase, a V phase, and a W phase. The motor 12 has two winding groups. The motor control device 13 is provided at an end of the motor 12. The motor control device 13 independently controls the power supply to the two winding groups.

<About the motor>
As shown in FIG. 1 , the motor 12 has a motor body 20 and a connector portion 24 .

The motor body 20 has a cylindrical housing 21. The housing 21 is made of metal. The metal is a metal with excellent electrical and thermal conductivity, such as aluminum. A rotor 30 and a stator 40 are housed inside the housing 21. The rotor 30 has a cylindrical core 31 and an output shaft 32 extending along the axis of the core 31. A plurality of magnets are fixed to the outer peripheral surface of the core 31. The output shaft 32 is rotatably supported on the inner peripheral surface of the housing 21 via a bearing. The stator 40 is provided around the rotor 30. The motor body 20 has a first end from which the output shaft 32 protrudes and a second end opposite the first end. Similarly, the housing 21 has a first end from which the output shaft 32 protrudes and a second end opposite the first end.

The second end of the motor body 20 is provided with a board accommodating section 22. The board accommodating section 22 is made of the same metal as the housing 21 and is provided integrally with the housing 21. The board accommodating section 22 is a rectangular box-shaped body having an opening 22A. The opening 22A opens in the opposite direction to the motor body 20. The board accommodating section 22 has a protruding section 22B. The protruding section 22B is a portion of the board accommodating section 22 that protrudes to the side of the housing 21. When viewed from the axial direction of the housing 21, the side is a direction perpendicular to the axial direction. The board accommodating section 22 has a fitting hole 22C. The fitting hole 22C is provided in the end wall of the protruding section 22B. The fitting hole 22C penetrates the end wall of the protruding section 22B in the axial direction of the motor 12.

A heat sink 23 is attached to the second end of the housing 21. The heat sink 23 is made of the same metal as the housing 21. The heat sink 23 is cylindrical. The heat sink 23 is positioned coaxially with the axis of the output shaft 32. The heat sink 23 closes the second end of the housing 21.

The connector portion 24 is fitted into the fitting hole 22C of the board accommodating portion 22. The connector portion 24 is made of synthetic resin. The connector portion 24 has a first connector fitting portion 24A and a second connector fitting portion 24B. The connector portion 24 is inserted into the fitting hole 22C with the first connector fitting portion 24A and the second connector fitting portion 24B facing the opening 22A of the board accommodating portion 22. The first connector fitting portion 24A and the second connector fitting portion 24B protrude from the end wall of the board accommodating portion 22 in the direction in which the housing 21 extends. A plug connector is fitted into the first connector fitting portion 24A. The plug connector is provided at a first end of the wiring. The second end of the wiring is connected to a DC power source such as a battery provided outside the motor device 11. The second connector fitting portion 24B has a configuration similar to that of the first connector fitting portion 24A.

<About windings>
1, the stator 40 includes a plurality of winding groups 41 each including a three-phase set consisting of a U-phase winding, a V-phase winding, and a W-phase winding. The winding group 41 includes a first winding group 41A constituting a first system of the motor device 11, and a second winding group 41B constituting a second system of the motor device 11. The first winding group 41A includes a winding U1 which is a U-phase winding, a winding V1 which is a V-phase winding, and a winding W1 which is a W-phase winding. The second winding group 41B includes a winding U2 which is a U-phase winding, a winding V2 which is a V-phase winding, and a winding W2 which is a W-phase winding.

In the first winding group 41A, the first input terminals U1a, V1a, W1a, which are the first ends of the three-phase windings U1, V1, W1, are drawn from the stator 40 through the heat sink 23 to the outside of the housing 21. After being drawn to the outside of the housing 21, the first input terminals U1a, V1a, W1a are electrically connected to the circuit board 51 of the motor control device 13. The first input terminals U1a, V1a, W1a are individually connected to the circuit board 51. In addition, in the first winding group 41A, the first terminals U1b, V1b, W1b, which are the second ends of the three-phase windings U1, V1, W1, are drawn from the stator 40 through the heat sink 23 to the outside of the housing 21. After being drawn to the outside of the housing 21, the first terminals U1b, V1b, W1b are electrically connected to the circuit board 51 of the motor control device 13. The first terminals U1b, V1b, and W1b are electrically connected to the circuit board 51. The first terminals U1b, V1b, and W1b are connected to the circuit board 51 so as to form a neutral point NA. That is, in the first winding group 41A, the three-phase windings U1, V1, and W1 are connected to each other by a star connection (Y connection).

Similarly, in the second winding group 41B, the second input terminals U2a, V2a, W2a, which are the first ends of the three-phase windings U2, V2, W2, are drawn from the stator 40 to the outside of the housing 21 through the heat sink 23. After being drawn to the outside of the housing 21, the second input terminals U2a, V2a, W2a are electrically connected to the circuit board 51 of the motor control device 13. The second input terminals U2a, V2a, W2a are individually connected to the circuit board 51. In addition, in the second winding group 41B, the second terminals U2b, V2b, W2b, which are the second ends of the three-phase windings U2, V2, W2, are drawn from the stator 40 to the outside of the housing 21 through the heat sink 23. After being drawn to the outside of the housing 21, the second terminals U2b, V2b, W2b are electrically connected to the circuit board 51 of the motor control device 13. The second terminals U2b, V2b, and W2b are electrically connected to the circuit board 51. The second terminals U2b, V2b, and W2b are connected to the circuit board 51 so as to form a neutral point NB. That is, in the second winding group 41B, the three-phase windings U2, V2, and W2 are connected to each other by a star connection (Y connection).

As a result, a total of six winding ends, which are the input and terminal ends of the first winding group 41A, are pulled out from the stator 40 to the outside of the housing 21. Similarly, a total of six winding ends, which are the input and terminal ends of the second winding group 41B, are pulled out from the stator 40 to the outside of the housing 21. In other words, a total of 12 winding ends in the first winding group 41A and the second winding group 41B are pulled out from the stator 40 to the outside of the housing 21.

More specifically, as shown in FIG. 2, the windings U1, V1, W1, U2, V2, and W2 of the first winding group 41A and the second winding group 41B are wound in a predetermined order around the stator 40 in the circumferential direction of the stator 40. The stator 40 has a plurality of teeth 42. For example, the number of teeth 42 is 12. Each of the teeth 42 is wound with any of the windings U1, V1, W1, U2, V2, and W2 a predetermined number of times. In FIG. 2, the dashed line indicates the boundary between the inside and outside of the housing 21. The side below the dashed line in FIG. 2 indicates the inside of the housing 21, and the side above the dashed line in FIG. 2 indicates the outside of the housing 21.

For example, the winding U1 is a double winding in which a winding U1+ including a first input end U1a and a winding U1- including a first end U1b are connected in series. Similarly, the winding V1 is configured by connecting a winding V1+ including a first input end V1a and a winding V1- including a first end V1b in series. The winding W1 is configured by connecting a winding W1+ including a first input end W1a and a winding W1- including a first end W1b in series. The winding U2 is configured by connecting a winding U2+ including a second input end U2a and a winding U2- including a second end U2b in series. The winding V2 is configured by connecting a winding V2+ including a second input end V2a and a winding V2- including a second end V2b in series. The winding W2 is configured by connecting in series a winding W2+ including a second input end W2a and a winding W2- including a second end W2b.

For example, if the tooth around which the winding U2+ is wound is number 1, the adjacent teeth in sequence along one circumferential direction of the stator 40 are numbered 2 to 12. The winding U2- is wound around tooth number 4. The end of the winding U2+ opposite the second input end U2a extends from tooth number 1 to tooth number 4. The second input end U2a of the winding U2 is drawn from tooth number 1 to the outside of the housing 21. The second end U2b of the winding U2 is drawn from tooth number 4 to the outside of the housing 21.

Furthermore, a winding V2+ is wound around tooth number 2. A winding V2- is wound around tooth number 5. The end of winding V2+ opposite the second input end V2a extends from tooth number 2 to tooth number 5. The second input end V2a of winding V2 is pulled out from tooth number 2 to the outside of housing 21. Further, a second end V2b of winding V2 is pulled out from tooth number 5 to the outside of housing 21.

Furthermore, a winding W2+ is wound around tooth number 3. A winding W2- is wound around tooth number 6. The end of winding W2+ opposite the second input end W2a extends from tooth number 3 to tooth number 6. The second input end W2a of winding W2 is pulled out from tooth number 3 to the outside of housing 21. Further, a second end W2b of winding W2 is pulled out from tooth number 6 to the outside of housing 21.

The second terminals U2b, V2b, and W2b, which are respectively extended from the fourth, fifth, and sixth teeth to the outside of the housing 21, are electrically connected to each other to form the neutral point NB.

Furthermore, a winding U1+ is wound around tooth number 10. A winding U1- is wound around tooth number 7. The end of winding U1+ opposite the first input end U1a extends from tooth number 10 to tooth number 7. The first input end U1a of winding U1 is pulled out from tooth number 10 to the outside of housing 21. Furthermore, a first end U1b of winding U1 is pulled out from tooth number 7 to the outside of housing 21.

Furthermore, a winding V1+ is wound around tooth number 11. A winding V1- is wound around tooth number 8. The end of winding V1+ opposite the first input end V1a extends from tooth number 11 to tooth number 8. The first input end V1a of winding V1 is drawn out from tooth number 11 to the outside of housing 21. Furthermore, a first end V1b of winding V1 is drawn out from tooth number 8 to the outside of housing 21.

Furthermore, a winding W1+ is wound around tooth number 12. A winding W1- is wound around tooth number 9. The end of winding W1+ opposite the first input end W1a extends from tooth number 12 to tooth number 9. The first input end W1a of winding W1 is pulled out from tooth number 12 to the outside of housing 21. Furthermore, a first end W1b of winding W1 is pulled out from tooth number 9 to the outside of housing 21.

The first terminals U1b, V1b, and W1b, which are respectively drawn from the seventh, eighth, and ninth teeth to the outside of the housing 21, are electrically connected to each other to form the neutral point NA.

As a result, when pulled out to the outside of the housing 21, the set of first input terminals U1a, V1a, W1a and the set of second input terminals U2a, V2a, W2a are adjacent to each other in the circumferential direction of the stator 40. Also, when pulled out to the outside of the housing 21, the set of first terminals U1b, V1b, W1b and the set of second terminals U2b, V2b, W2b are adjacent to each other in the circumferential direction of the stator 40. In other words, the neutral point NA and the neutral point NB are adjacent to each other outside the housing 21. The phase positions of the neutral point NA and the neutral point NB are shifted by 90 degrees in the circumferential direction of the stator 40.

<Motor control device>
As shown in Fig. 1, the motor control device 13 has a cover 50 and a circuit board 51. The cover 50 is made of synthetic resin. The cover 50 is a rectangular box-shaped body that opens toward the motor main body 20. The cover 50 is attached to the board accommodating portion 22 so as to cover the opening 22A of the board accommodating portion 22, with the circuit board 51 supported by the connector portion 24.

The circuit board 51 has a configuration for supplying power to the motor 12. The contour shape of the outer periphery of the circuit board 51 corresponds to the contour shape of the inner periphery of the board accommodating section 22 when viewed from the axial direction of the motor 12. The circuit board 51 is accommodated inside the board accommodating section 22. The circuit board 51 is placed on top of the heat sink 23 and connector section 24 accommodated inside the board accommodating section 22. The circuit board 51 is fixed to the connector section 24. The circuit board 51 is maintained in a position perpendicular to the axial direction of the housing 21.

The circuit board 51 has a configuration for supplying power to the first winding group 41A of the first system of the motor 12. The circuit board 51 has a first inverter circuit 52A, a first filter circuit 53A, a first driver circuit 54A, a first custom circuit 55A, and a first microcomputer 56A as components corresponding to the first winding group 41A of the first system. The circuit board 51 also has a first input end connection portion 61A and a first termination connection portion 62A. The circuit board 51 has a back surface that faces the end wall of the board accommodating portion 22 in the axial direction of the housing 21, and a front surface opposite the back surface.

The first inverter circuit 52A generates power supplied to the first winding group 41A. The first inverter circuit 52A converts DC power from a DC power source into three-phase AC power. The first inverter circuit 52A is provided on the back surface of the circuit board 51. The first inverter circuit 52A has multiple FETs (Field Effect Transistors). The FETs are heat-generating elements. Each FET is maintained in contact with the heat sink 23 via thermal grease.

The first filter circuit 53A is, for example, an LC filter consisting of an inductor and a capacitor. The first filter circuit 53A is provided on the surface of the circuit board 51. The inductor is a heating element consisting of a coil.

The first driver circuit 54A is a chip-type integrated circuit. The first driver circuit 54A controls the switching operation of the first inverter circuit 52A. The first driver circuit 54A is provided on the surface of the circuit board 51.

The first custom circuit 55A is a chip-type integrated circuit. The first custom circuit 55A adjusts and monitors the power required for the operation of the first microcomputer 56A. The first custom circuit 55A is provided on the surface of the circuit board 51.

The first microcomputer 56A is a chip-type integrated circuit. The first microcomputer 56A controls the power supply to the first winding group 41A via the first inverter circuit 52A. The first microcomputer 56A is provided on the surface of the circuit board 51.

The first input end connection portion 61A is a group of three-phase connection portions to which the first input ends U1a, V1a, and W1a are individually connected. When viewed from the axial direction of the housing 21, the first input end connection portion 61A is provided at a position corresponding to the first input ends U1a, V1a, and W1a drawn out to the outside of the housing 21. The first input end connection portion 61A includes, for example, three insertion portions 61Aa that penetrate the circuit board 51 in its thickness direction. The insertion portions 61Aa are part of the copper foil that forms the pattern wiring of the circuit board 51. For example, the insertion portions 61Aa form part of the power path of the power supplied from the DC power source. The thickness direction of the circuit board 51 is also the axial direction of the housing 21. The first input ends U1a, V1a, and W1a are each electrically connected to the different insertion portions 61Aa by solder 61Ab when inserted into the corresponding insertion portions 61Aa from the axial direction of the housing 21. The insertion portion 61Aa and the solder 61Ab are examples of conductive members.

The first terminal connection portion 62A is a portion where the first terminals U1b, V1b, and W1b are connected together to form the neutral point NA. When viewed from the axial direction of the housing 21, the first terminal connection portion 62A is provided at a position corresponding to the first terminals U1b, V1b, and W1b drawn out to the outside of the housing 21. The first terminal connection portion 62A includes, for example, a single insertion portion 62Aa that penetrates the circuit board 51 in its thickness direction. The insertion portion 62Aa is a part of the copper foil that forms the pattern wiring of the circuit board 51. For example, the insertion portion 62Aa is independent of the pattern to which the insertion portion 61Aa is connected. The first terminals U1b, V1b, and W1b are electrically connected to the same insertion portion 62Aa by solder 62Ab when inserted into the same insertion portion 62Aa from the axial direction of the housing 21. In this case, the first ends U1b, V1b, and W1b are electrically connected to each other via the insert 62Aa and the solder 62Ab to form a neutral point NA. The insert 62Aa and the solder 62Ab are examples of conductive members.

The circuit board 51 has a configuration for supplying power to the second winding group 41B of the second system of the motor 12. The circuit board 51 has a second inverter circuit 52B, a second filter circuit 53B, a second driver circuit 54B, a second custom circuit 55B, and a second microcomputer 56B as components corresponding to the second winding group 41B of the second system. The circuit board 51 also has a second input end connection portion 61B and a second termination connection portion 62B.

The second inverter circuit 52B generates power to be supplied to the second winding group 41B. The second inverter circuit 52B converts DC power from a DC power source into three-phase AC power. The second inverter circuit 52B is provided on the back surface of the circuit board 51. The second inverter circuit 52B has multiple FETs (Field Effect Transistors). Each FET is maintained in contact with the heat sink 23 via thermal grease.

The second filter circuit 53B is, for example, an LC filter including an inductor and a capacitor, and is provided on the surface of the circuit board 51.
The second driver circuit 54B is a chip-type integrated circuit. The second driver circuit 54B controls the switching operation of the second inverter circuit 52B. The second driver circuit 54B is provided on the surface of the circuit board 51.

The second custom circuit 55B is a chip-type integrated circuit. The second custom circuit 55B adjusts and monitors the power required for the operation of the second microcomputer 56B. The second custom circuit 55B is provided on the surface of the circuit board 51.

The second microcomputer 56B is a chip-type integrated circuit. The second microcomputer 56B controls the power supply to the second winding group 41B via the second inverter circuit 52B. The second microcomputer 56B is provided on the surface of the circuit board 51.

The second input end connection portion 61B is a group of three-phase connection portions to which the second input ends U2a, V2a, and W2a are individually connected. The second input end connection portion 61B is provided at a position corresponding to the second input ends U2a, V2a, and W2a drawn out to the outside of the housing 21 when viewed from the axial direction of the housing 21. The second input end connection portion 61B includes, for example, three insertion portions 61Ba that penetrate the circuit board 51 in its thickness direction. The insertion portions 61Ba are part of the copper foil that forms the pattern wiring of the circuit board 51. For example, the insertion portions 61Ba form part of the power path of the power supplied from the DC power source. The second input ends U2a, V2a, and W2a are electrically connected to the different insertion portions 61Ba by the solder 61Bb when inserted into the corresponding insertion portions 61Ba from the axial direction of the housing 21. The insertion portions 61Ba and the solder 61Bb are examples of conductive members.

The second terminal connection portion 62B is a portion where the second terminals U2b, V2b, and W2b are connected together to form the neutral point NB. When viewed from the axial direction of the housing 21, the second terminal connection portion 62B is provided at a position corresponding to the second terminals U2b, V2b, and W2b drawn out to the outside of the housing 21. The second terminal connection portion 62B includes, for example, a single insertion portion 62Ba that penetrates the circuit board 51 in its thickness direction. The insertion portion 62Ba is a part of the copper foil that forms the pattern wiring of the circuit board 51. For example, the insertion portion 62Ba is independent of the pattern to which the insertion portion 62Aa is connected. The second terminals U2b, V2b, and W2b are electrically connected to the same insertion portion 62Ba by solder 62Bb when inserted into the same insertion portion 62Ba from the axial direction of the housing 21. In this case, the second terminals U2b, V2b, and W2b are electrically connected to each other via the insert 62Ba and the solder 62Bb to form the neutral point NB. The insert 62Ba and the solder 62Bb are examples of conductive members.

The circuit board 51 has an angle sensor 58 for detecting the rotation angle of the rotor 30, i.e., the output shaft 32. The angle sensor 58 is a magnetic sensor, for example an MR sensor (magnetoresistive effect sensor). The direction of the magnetic field applied to the angle sensor 58 changes according to the rotation angle of the rotor 30. The angle sensor 58 is provided on the axis of the output shaft 32 when viewed from the axial direction of the housing 21. The angle sensor 58 generates an electrical signal according to the change in the direction of the magnetic field. The angle sensor 58 is provided on the back surface of the circuit board 51.

<Electrical configuration of the motor device>
As shown in FIG. 1 , the first system including a first inverter circuit 52A, a first filter circuit 53A, a first driver circuit 54A, a first custom circuit 55A, and a first microcomputer 56A are mounted on a circuit board 51.

More specifically, as shown in FIG. 3, the first input terminals U1a, V1a, and W1a are connected to the first inverter circuit 52A via a first input terminal connection portion 61A provided on the circuit board 51. The first input terminals U1a, V1a, and W1a are each connected to the midpoint of a leg of a corresponding phase of the first inverter circuit 52A. The first terminals U1b, V1b, and W1b form a neutral point NA via a first terminal connection portion 62A provided on the circuit board 51.

The first inverter circuit 52A has three legs. Each leg has two FETs (Field Effect Transistors) 57A connected in series. The three legs are connected in parallel. The three legs are connected to the positive terminal of a DC power supply via a first filter circuit 53A, and are also connected to the negative terminal of the DC power supply.

The first filter circuit 53A includes a coil that is connected in series to the power supply line, and a capacitor that is connected to the power supply line and the ground line. The first filter circuit 53A removes noise that is superimposed on the DC power supplied through the positive terminal of the DC power supply.

The first microcomputer 56A is used in combination with the first custom circuit 55A. The first microcomputer 56A generates switching commands for each FET 57A based on the rotation angle detected through the angle sensor 58. The switching commands are input to each FET 57A via the first driver circuit 54A. Each FET 57A performs a switching operation based on the switching command, thereby converting the DC power supplied from the DC power source into three-phase AC power. The AC power generated by the first inverter circuit 52A is supplied to the first winding group 41A via the first input end connection portion 61A.

As shown in FIG. 1, the second inverter circuit 52B, the second filter circuit 53B, the second driver circuit 54B, the second custom circuit 55B, and the second microcomputer 56B, which constitute the second system, are mounted on a circuit board 51.

More specifically, as shown in FIG. 3, the second input terminals U2a, V2a, and W2a are connected to the second inverter circuit 52B via the second input terminal connection portion 61B provided on the circuit board 51. The input terminals U2a, V2a, and W2a are each connected to the midpoint of the leg of the corresponding phase of the second inverter circuit 52B. The second terminals U2b, V2b, and W2b form the neutral point NB via the second terminal connection portion 62B provided on the circuit board 51.

The second inverter circuit 52B has three legs. Each leg has two FETs (Field Effect Transistors) 57B connected in series. The three legs are connected in parallel. The three legs are connected to the positive terminal of the DC power supply and to the negative terminal of the DC power supply via the second filter circuit 53B.

The second filter circuit 53B includes a coil that is connected in series to the power supply line, and a capacitor that is connected to the power supply line and the ground line. The second filter circuit 53B removes noise that is superimposed on the DC power supplied through the positive terminal of the DC power supply.

The second microcomputer 56B is used in combination with the second custom circuit 55B. The second microcomputer 56B generates switching commands for each FET 57B based on the rotation angle detected through the angle sensor 58 provided on the circuit board 51. The switching commands are input to each FET 57B via the second driver circuit 54B. Each FET 57B performs a switching operation based on the switching command, thereby converting the DC power supplied from the DC power source into three-phase AC power. The AC power generated by the second inverter circuit 52B is supplied to the second winding group 41B via the second input end connection portion 61B.

<About the board layout>
4, the circuit board 51 has a board motor portion 51A that overlaps the housing 21 when viewed in the axial direction of the housing 21, and an extension portion 51B that extends to the side of the housing 21. When viewed in the axial direction of the housing 21, the side is a direction perpendicular to the axial direction of the housing 21. The extension portion 51B extends outward beyond the housing 21 in the radial direction of the housing 21. When viewed in the axial direction of the housing 21, the extension portion 51B overlaps the connector portion 24.

The circuit board 51 is divided into a power circuit area A1 and a control circuit area A2 when viewed from the axial direction of the housing 21. The power circuit area A1 and the control circuit area A2 are aligned along the boundary line BL when viewed from the axial direction of the housing 21. The components of the first system and the components of the second system are arranged in positions that are symmetrical with respect to the boundary line BL. The power circuit area A1 is an area that generally overlaps with the housing 21 when viewed from the axial direction of the housing 21. Also, the power circuit area A1 is an area that does not overlap with the connector section 24 when viewed from the axial direction of the housing 21. In other words, the power circuit area A1 is an area that generally overlaps with the board motor section 51A. The control circuit area A2 is an area that generally does not overlap with the housing 21 when viewed from the axial direction of the housing 21. Also, the control circuit area A2 is an area that overlaps with the connector section 24 when viewed from the axial direction of the housing 21. In other words, the control circuit area A2 is an area that generally overlaps with the extension section 51B.

The power circuit area A1 has a power circuit. The power circuit is an electric circuit for operating the motor 12 and for supplying power to the motor 12. The power circuit has electronic components. The power circuit area A1 is further divided into a first power circuit area A11 and a second power circuit area A12 by a boundary line BL. The power circuit area A1 has an angle sensor 58. The angle sensor 58 is disposed across both the first power circuit area A11 and the second power circuit area A12 by straddling the boundary line BL.

The first power circuit area A11 has a power circuit for supplying power to the first winding group 41A. The power circuit includes a first inverter circuit 52A, a first filter circuit 53A, and a first driver circuit 54A. The first filter circuit 53A is arranged adjacent to the control circuit area A2. The first inverter circuit 52A is arranged in an area not adjacent to the control circuit area A2. More specifically, the first inverter circuit 52A is arranged in an area opposite the control circuit area A2 with respect to the angle sensor 58 (in other words, the output shaft 32).

The first power circuit area A11 also has a first input end connection portion 61A. The first input end connection portion 61A is arranged so as to be close to the first inverter circuit 52A within an allowable range when viewed from the axial direction of the housing 21. The first input end connection portion 61A is also arranged so as to be closer to the periphery of the board accommodating portion 22 than the first inverter circuit 52A. In other words, the first input end connection portion 61A is arranged in an area that is not adjacent to the control circuit area A2 and is arranged in an area on the opposite side of the control circuit area A2 with respect to the angle sensor 58 (in other words, the output shaft 32). This means that the first input end connection portion 61A is arranged in an area that is not adjacent to the extension portion 51B. The first input end connection portion 61A is also arranged close to the outer periphery of the housing 21 within an allowable range while being arranged inside the housing 21 when viewed from the axial direction of the housing 21. In other words, the first input end connection portion 61A is arranged away from the angle sensor 58 within an allowable range.

The first power circuit area A11 also has a first termination connection portion 62A. The first termination connection portion 62A is disposed adjacent to the control circuit area A2 in the area adjacent to the control circuit area A2. The first termination connection portion 62A is disposed in the area between the control circuit area A2 and the angle sensor 58 (in other words, the output shaft 32). The first termination connection portion 62A is disposed inside the housing 21 when viewed in the axial direction of the housing 21, and is disposed adjacent to the outer periphery of the housing 21 within an allowable range. In other words, the first termination connection portion 62A is disposed away from the first input end connection portion 61A. The first termination connection portion 62A is also disposed away from the angle sensor 58 within an allowable range.

The second power circuit area A12 has a power circuit for supplying power to the second winding group 41B. The power circuit includes a second inverter circuit 52B, a second filter circuit 53B, and a second driver circuit 54B. The second filter circuit 53B is arranged adjacent to the control circuit area A2. The second inverter circuit 52B is arranged in an area not adjacent to the control circuit area A2. More specifically, the second inverter circuit 52B is arranged in an area opposite the control circuit area A2 with respect to the angle sensor 58 (in other words, the output shaft 32).

The second power circuit area A12 also has a second input end connection portion 61B. The second input end connection portion 61B is arranged so as to be close to the second inverter circuit 52B within an allowable range when viewed from the axial direction of the housing 21. The second input end connection portion 61B is arranged so as to be closer to the periphery of the board accommodating portion 22 than the second inverter circuit 52B. In other words, the second input end connection portion 61B is arranged in an area that is not adjacent to the control circuit area A2 and is arranged in an area on the opposite side of the control circuit area A2 with respect to the angle sensor 58 (in other words, the output shaft 32). This means that the second input end connection portion 61B is arranged in an area that is not adjacent to the extension portion 51B. The second input end connection portion 61B is arranged inside the housing 21 when viewed from the axial direction of the housing 21, and is arranged close to the outer periphery of the housing 21 within an allowable range. In other words, the second input end connection portion 61B is arranged away from the angle sensor 58 within an allowable range.

The second power circuit area A12 also has a second terminal connection portion 62B. The second terminal connection portion 62B is disposed adjacent to the control circuit area A2 in the area adjacent to the control circuit area A2. The second terminal connection portion 62B is disposed in the area between the control circuit area A2 and the angle sensor 58 (in other words, the output shaft 32). The second terminal connection portion 62B is disposed inside the housing 21 when viewed from the axial direction of the housing 21, and is disposed adjacent to the outer periphery of the housing 21 within an allowable range. In other words, the second terminal connection portion 62B is disposed away from the second input end connection portion 61B. The second terminal connection portion 62B is also disposed away from the angle sensor 58 within an allowable range.

The control circuit area A2 has a control circuit. The control circuit is an electric circuit for operating the motor 12 and for controlling the power supply to the motor 12. The control circuit has electronic components. The control circuit area A2 is further divided by a boundary line BL into a first control circuit area A21 and a second control circuit area A22.

The first control circuit area A21 has a control circuit for controlling the power supply to the first winding group 41A. The control circuit includes a first custom circuit 55A and a first microcomputer 56A.

The second control circuit area A22 has a control circuit for controlling the power supply to the second winding group 41B. The control circuit includes a second custom circuit 55B and a second microcomputer 56B.

<How to connect the termination>
4, 5, and 6 show the connection state of the first terminal connection portion 62A. More specifically, the circuit board 51 has a single through hole 71 penetrating in the thickness direction. The through hole 71 is an oval shape formed by connecting two semicircles with two line segments, for example, a rectangle with rounded corners. The periphery of the through hole 71 is covered with copper foil to form the insertion portion 62Aa. The first terminals U1b, V1b, and W1b are inserted into the insertion portion 62Aa so as to be aligned in a row along the longitudinal direction of the insertion portion 62Aa. The first terminals U1b, V1b, and W1b are fixed to the insertion portion 62Aa by solder 62Ab from both sides of the circuit board 51. As a result, the first terminals U1b, V1b, and W1b are electrically connected to the circuit board 51 via the insertion portion 62Aa and the solder 62Ab, i.e., the first terminal connection portion 62A. The first terminal ends U1b, V1b, W1b are electrically connected to one another via the insertion portion 62Aa and the solder 62Ab, i.e., the first terminal connection portion 62A, to form a neutral point NA.

In contrast, as shown in FIG. 4, the connection state of the first input end connection portion 61A is the same as the connection state of the first termination connection portion 62A in that it has the configuration of the insertion portion 61Aa and solder 61Ab. That is, the circuit board 51 has three through holes 73 penetrating in its thickness direction. The through holes 73 are circular, for example, perfect circles. The periphery of the through holes 73 is covered with copper foil to form the insertion portion 61Aa. The first input ends U1a, V1a, W1a are inserted into different insertion portions 61Aa. The first input ends U1a, V1a, W1a are each individually fixed to the insertion portion 61Aa by solder 61Ab from both sides of the circuit board 51. As a result, the first input ends U1a, V1a, W1a are each individually electrically connected to the circuit board 51 via the insertion portion 61Aa and solder 61Ab. In other words, the first input terminals U1a, V1a, and W1a are electrically connected to the power path of the power supplied from the DC power source.

Also, as shown in parentheses in Figures 4, 5, and 6, the connection state of the second terminal connection portion 62B is configured similarly to the connection state of the first terminal connection portion 62A. That is, the circuit board 51 has a single through hole 72 penetrating in its thickness direction. The through hole 72 is an oval shape formed by connecting two semicircles with two line segments, for example, a rectangle with rounded corners. The periphery of the through hole 72 is covered with copper foil to form the insertion portion 62Ba. The second terminals U2b, V2b, and W2b are inserted into the insertion portion 62Ba so as to be aligned in a row along the longitudinal direction of the insertion portion 62Ba. Each of the second terminals U2b, V2b, and W2b is fixed to the insertion portion 62Ba by solder 62Bb from both sides of the circuit board 51. As a result, the second terminals U2b, V2b, and W2b are electrically connected to the circuit board 51 via the insertion portion 62Ba and the solder 62Bb. The second terminals U2b, V2b, and W2b are also electrically connected to each other via the insertion portion 62Ba and the solder 62Bb to form the neutral point NB.

In contrast, as shown in FIG. 4, the connection state of the second input end connection portion 61B is the same as the connection state of the second termination connection portion 62B in that it has a configuration of an insertion portion 61Ba and solder 61Bb. That is, the circuit board 51 has three through holes 74 penetrating in its thickness direction. The through holes 74 are circular, for example, perfect circles. The periphery of the through holes 74 is covered with copper foil to form the insertion portion 61Ba. The second input ends U2a, V2a, W2a are inserted into different insertion portions 61Ba. The second input ends U2a, V2a, W2a are each individually fixed to the insertion portion 61Ba by solder 61Bb from both sides of the circuit board 51. As a result, the second input ends U2a, V2a, W2a are each individually electrically connected to the circuit board 51 via the insertion portion 61Ba and solder 61Bb. In other words, the second input terminals U2a, V2a, and W2a are electrically connected to the power path of the power supplied from the DC power source.

<Action of this embodiment>
When manufacturing the motor device 11, for the first system, a step of electrically connecting the first input terminals U1a, V1a, W1a to the circuit board 51 and a step of electrically connecting the first terminals U1b, V1b, W1b to each other are essential. The same is true for the second system, where a step of electrically connecting the second input terminals U2a, V2a, W2a to the circuit board 51 and a step of electrically connecting the second terminals U2b, V2b, W2b to each other are essential.

The step of electrically connecting the first input terminals U1a, V1a, and W1a to the circuit board 51 includes forming a power connection by forming a first input terminal connection portion 61A. The step of electrically connecting the first terminals U1b, V1b, and W1b to each other includes forming a neutral point NA by forming a first terminal connection portion 62A. Furthermore, the step of electrically connecting the second input terminals U2a, V2a, and W2a to the circuit board 51 includes forming a power connection by forming a second input terminal connection portion 61B. The step of electrically connecting the second terminals U2b, V2b, and W2b to each other includes forming a neutral point NB by forming a second terminal connection portion 62B.

In the case of this embodiment, the process of forming the power supply connection and the process of forming the neutral point can be performed after the stator 40 is accommodated in the housing 21 and the three-phase input terminals and the three-phase output terminals are pulled out from the stator 40 to the outside of the housing 21. As a result, the process of forming the neutral point, which was essential before accommodating the stator 40 in the housing 21, can be performed after accommodating the stator 40 in the housing 21, just like the process of forming the power supply connection.

<Effects of the First Embodiment>
(1-1) Since the process of forming the power supply connection and the process of forming the neutral point can be carried out in the same process after the stator 40 is accommodated in the housing 21, the number of processes required to manufacture the motor device 11 can be reduced.

(1-2) The process of forming the neutral point can be carried out outside the housing 21 after the stator 40 is accommodated in the housing 21, which prevents conductive foreign matter generated by welding, etc. from entering the inside of the housing 21. This prevents the occurrence of situations in which the motor device 11 is unable to perform its intended function.

(1-3) In the process of forming the neutral point NA, it is sufficient to carry out the same method for the first terminals U1b, V1b, and W1b. Similarly, in the process of forming the neutral point NB, it is sufficient to carry out the same method for the second terminals U2b, V2b, and W2b. In other words, it is sufficient to carry out the same method for the first terminals U1b, V1b, and W1b and the second terminals U2b, V2b, and W2b. This is effective in reducing the number of processes when manufacturing the motor device 11.

(1-4) In the process of forming the neutral point NA, the first terminals U1b, V1b, and W1b are inserted into the same insertion portion 62Aa and electrically connected to each other with solder 62Ab. This is also the case in the process of forming the neutral point NB. In this case, the process of forming the neutral point can contribute to reducing electrical resistance.

(1-5) The input

end connection parts

61A, 61B and the

termination connection parts

62A, 62B are formed on the same circuit board 51. This is effective in improving work efficiency when the process of forming the power supply connection and the process of forming the neutral point are performed in the same process.

(1-6) The input

end connection parts

61A, 61B and the

termination connection parts

62A, 62B are arranged at a distance from each other. Also, the power circuit including the first inverter circuit 52A, the first filter circuit 53A, and the first driver circuit 54A is arranged close to the first input ends U1a, V1a, and W1a. Similarly, the power circuit including the second inverter circuit 52B, the second filter circuit 53B, and the second driver circuit 54B is arranged close to the second input ends U2a, V2a, and W2a. This allows the components involved in the supply of the drive current to be concentrated in one area. This is effective in improving the efficiency when supplying the drive current.

(1-7) Each input

end connection part

61A, 61B is arranged in a region not adjacent to the control circuit region A2, as far away as possible from the control circuit region A2. In other words, each input

end connection part

61A, 61B is arranged in a region not adjacent to the extension part 51B. Each input

end connection part

61A, 61B is arranged in a region on the opposite side of the output shaft 32 from the extension part 51B when viewed from the axial direction of the housing 21. Furthermore, the first input ends U1a, V1a, W1a and the power circuits (first inverter circuit 52A, first filter circuit 53A, and first driver circuit 54A) are arranged close to each other. Similarly, the second input ends U2a, V2a, W2a and the power circuits (second inverter circuit 52B, second filter circuit 53B, and second driver circuit 54B) are arranged close to each other. This allows components that generate heat easily and therefore require heat dissipation using a heat sink or similar to be placed in the board motor section 51A, while components that do not generate heat easily can be placed in the extension section 51B. In this case, the efficiency of heat dissipation can be increased, so even if a heat sink or similar is used, the increase in capacity can be suppressed.

(1-8) Each input

end connection portion

61A, 61B is disposed inside the housing 21 when viewed in the axial direction of the housing 21. Similarly, each

termination connection portion

62A, 62B is disposed inside the housing 21 when viewed in the axial direction of the housing 21. For example, when forming the first input end connection portion 61A, it is sufficient to pull out the first input ends U1a, V1a, W1a from the stator 40 along the axial direction of the housing 21. The same is true when forming the second input end connection portion 61B and when forming each

termination connection portion

62A, 62B. This can improve the work efficiency in the process of forming the power supply connection and the process of forming the neutral point.

(1-9) Each input

end connection portion

61A, 61B is arranged inside the housing 21 as viewed in the axial direction of the housing 21, and is arranged close to the outer periphery of the housing 21 within the allowable range. Similarly, each

termination connection portion

62A, 62B is arranged inside the housing 21 as viewed in the axial direction of the housing 21, and is arranged close to the outer periphery of the housing 21 within the allowable range. As a result, each input

end connection portion

61A, 61B and each

termination connection portion

62A, 62B are arranged on the circuit board 51, separated from the angle sensor 58 within the allowable range. Therefore, it is possible to suppress the effect that the magnetism generated when supplying the drive current has on the detection result of the angle sensor 58 as magnetic noise.

Second Embodiment
Hereinafter, a motor device according to the second embodiment will be described with reference to the drawings, focusing on the differences from the first embodiment. For the sake of convenience, the same components as those in the first embodiment will be denoted by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

7 and 8 show the connection state of the first terminal connection portion 63A according to this embodiment. More specifically, the circuit board 51 has three through holes 75 penetrating in its thickness direction. The through holes 75 are circular, for example, perfect circles. The periphery of the through holes 75 is covered with copper foil to form the insertion portion 63Aa. The copper foil forming the three insertion portions 63Aa is the same copper foil. The first terminals U1b, V1b, and W1b are each inserted into different insertion portions 63Aa. The first terminals U1b, V1b, and W1b are each individually fixed to the insertion portion 63Aa by solder 63Ab from both sides of the circuit board 51. The first terminals U1b, V1b, and W1b are each individually electrically connected to the insertion portion 63Aa via the solder 63Ab. As a result, the first terminals U1b, V1b, and W1b are electrically connected to the circuit board 51 via the insertion portion 63Aa and the solder 63Ab, i.e., the first terminal connection portion 63A. The first terminals U1b, V1b, and W1b are also electrically connected to each other via the insertion portion 63Aa and the solder 63Ab, i.e., the first terminal connection portion 63A, to form a neutral point NA.

Also, as shown in parentheses in Figures 7 and 8, the connection state of the second terminal connection portion 63B in this embodiment is configured similarly to the connection state of the first terminal connection portion 63A. That is, the circuit board 51 has three through holes 76 penetrating in its thickness direction. The through holes 76 are circular, for example, perfect circles. The periphery of the through holes 76 is covered with copper foil to form the insertion portion 63Ba. The copper foil forming the three insertion portions 63Ba is the same copper foil. The second terminals U2b, V2b, and W2b are inserted into different insertion portions 63Ba. The second terminals U2b, V2b, and W2b are individually fixed to the insertion portion 63Ba by solder 63Bb from both sides of the circuit board 51. The second terminals U2b, V2b, and W2b are individually electrically connected to the insertion portion 63Ba, i.e., the circuit board 51, via the solder 63Bb. As a result, the second terminals U2b, V2b, and W2b are electrically connected to the circuit board 51 via the insert portion 63Ba and the solder 63Bb, i.e., the second terminal connection portion 63B. The second terminals U2b, V2b, and W2b are also electrically connected to each other via the insert portion 63Ba and the solder 63Bb, i.e., the second terminal connection portion 62B, to form the neutral point NB.

<Effects of the Second Embodiment>
According to the second embodiment described above, in addition to the effects of the first embodiment and effects equivalent to (1-1) to (1-3) and (1-5) to (1-9), the following effects can be obtained.

(2-1) In the process of forming the neutral point NA, the first terminals U1b, V1b, and W1b are inserted into different insertion portions 63Aa, and are then individually electrically connected to the insertion portions 63Aa, i.e., the circuit board 51, via solder 63Ab. This is also the case in the process of forming the neutral point NB. In this case, the amount of solder used for electrical connection in the process of forming the neutral point can be reduced.

<Other embodiments>
The above-described embodiments may be modified as follows. In addition, the following other embodiments may be combined with each other to the extent that there is no technical contradiction.

In the first embodiment, the first terminals U1b, V1b, and W1b in the first terminal connection portion 62A can also be fixed to the circuit board 51 by welding. For example, as shown in FIG. 9, the first terminals U1b, V1b, and W1b are inserted into a single through hole 77 that penetrates the circuit board 51 in the thickness direction, and are fixed to the metal plate 64 by welding. The metal plate 64 is, for example, an L-shaped copper plate, and is fixed to the circuit board 51 by welding. In this case, in the first input end connection portion 61A, the first input ends U1a, V1a, and W1a can be fixed to the circuit board 51 by welding. This can be achieved by using the above-mentioned metal plate. According to the other embodiments described herein, effects similar to those of the first embodiment (1-1), (1-2), and (1-5) to (1-9) can be achieved. The other embodiments described herein can be similarly applied to the second embodiment.

- In each embodiment, if the effect of the magnetism generated when supplying the drive current as magnetic noise on the detection result of the angle sensor 58 is tolerable, each input

end connection part

61A, 61B may be positioned away from the outer periphery of the housing 21 within an acceptable range. In other words, each input

end connection part

61A, 61B may be positioned closer to the angle sensor 58 than in each embodiment. The same applies to each

end connection part

62A, 62B.

In each embodiment, when viewed from the axial direction of the housing 21, the input

end connection parts

61A, 61B may be disposed on the outer periphery or outside of the housing 21. This also applies to the

termination connection parts

62A, 62B. For example, the

termination connection parts

62A, 62B may be disposed in the extension part 51B, i.e., the control circuit area A2.

- In each embodiment, each input

end connection portion

61A, 61B may be arranged so as to be farther away from the periphery of the substrate accommodating portion 22 than each

inverter circuit

52A, 52B. For example, the first input end connection portion 61A may be arranged closer to the control circuit region A2 than the first inverter circuit 52A in a region not adjacent to the control circuit region A2. Also, each input

end connection portion

61A, 61B may be arranged in a region adjacent to the control circuit region A2. In other words, each input

end connection portion

61A, 61B may be arranged in a region adjacent to the extension portion 51B.

In each embodiment, the input

end connection portions

61A, 61B and the

termination connection portions

62A, 62B may be disposed in different regions of the power circuit region A1 and the control circuit region A2.
In each embodiment, the input

terminal connection parts

61A, 61B may be disposed in the control circuit area A2. In other words, the input

terminal connection parts

61A, 61B may be disposed in an area different from the

inverter circuits

52A, 52B.

In each embodiment, the arrangement of each input

end connection portion

61A, 61B and each

termination connection portion

62A, 62B may be interchanged. This can be achieved by shifting the phase of the stator 40 in each embodiment by 180 degrees when the stator 40 is accommodated in the housing 21. In addition, the other embodiments described here can also be achieved by changing the way each winding

group

41A, 41B is wound on the stator 40 or by changing the way it is routed.

In each embodiment, the input

end connection parts

61A, 61B and the

termination connection parts

62A, 62B may be arranged alternately in the circumferential direction of the housing 21. This can be achieved by changing the way in which the winding

groups

41A, 41B are wound around the stator 40 or by changing the way in which the winding

groups

41A, 41B are routed.

In each embodiment, the circuit board 51 may include multiple circuit boards. For example, the circuit board 51 includes a first circuit board having an area corresponding to the power circuit area A1, and a second circuit board having an area corresponding to the control circuit area A2. In this case, the input

end connection parts

61A, 61B are formed on the first circuit board, and the

termination connection parts

62A, 62B are formed on the second circuit board. In other words, the input

end connection parts

61A, 61B and the

termination connection parts

62A, 62B are disposed on different circuit boards.

- In each embodiment, the circuit board 51 may eliminate the extension portion 51B if the components mounted in the control circuit area A2 can be mounted in the power circuit area A1. The other embodiments described here can be applied to a motor device 11 in which the connector portion 24 is provided so as to overlap the housing 21 when viewed in the axial direction of the housing 21, for example, as shown in FIG. 10.

In each embodiment, the motor 12 may have only the first winding group 41A. In this case, the circuit board 51 may have a single system configuration.
In each embodiment, the motor device 11 may be used as a drive source for an electric power steering device, for example. In this case, the motor 12 functions as an assist motor that generates a steering assist force. The motor control device 13 controls the motor 12 as an assist motor.

In each embodiment, the motor device 11 may be used, for example, as a drive source for a reaction mechanism or a steering mechanism in a steer-by-wire steering device. In this case, the motor 12 functions as a reaction motor that generates a steering reaction force, or a steering motor that generates a steering force for steering the steered wheels of the vehicle. The motor control device 13 controls the motor 12 as a reaction motor or a steering motor.

- In each embodiment, the motor device 11 is not limited to vehicle applications. The motor device 11 of each embodiment is effective regardless of the application of the motor device 11 in that it can reduce the number of processes in manufacturing the motor device 11.

Claims

A motor device having a motor and a circuit board configured to supply a drive current to the motor,
The motor includes a rotor, a stator provided around the rotor, and a housing that accommodates the rotor and the stator.
the stator includes at least one winding group including a three-phase set consisting of a U-phase winding, a V-phase winding, and a W-phase winding;
Each of the three-phase windings has an input end and a termination end that are extended from the stator to the outside of the housing,
an input end of the three-phase winding is electrically connected to the circuit board, and thereby connected to a power source for the driving current;
A motor device in which the ends of the three-phase windings are electrically connected to the circuit board to form a neutral point in the winding group.
The circuit board has a conductive member,
2. The motor device according to claim 1, wherein ends of the three-phase windings are electrically connected to each other via the conductive member.
the conductive member includes an insertion portion that penetrates the circuit board and solder that electrically connects ends of the three-phase windings to each other,
3. The motor device according to claim 2, wherein the ends of the windings of the three phases are electrically connected to each other by the solder in a state where the ends are inserted into the insertion portions.
the conductive member includes a plurality of insertion portions that penetrate the circuit board and solder that electrically connects ends of the three-phase windings to each other;
3. The motor device according to claim 2, wherein the ends of the windings of the three phases are electrically connected to each other by being inserted into different insertion portions and electrically connected to the corresponding insertion portions via the solder.
The motor device according to any one of claims 1 to 4, wherein the circuit board to which the input ends of the three-phase windings are electrically connected and the circuit board to which the terminal ends of the three-phase windings are electrically connected are identical to each other.
a power circuit mounted on the circuit board and configured to convert power supplied from the power source to input ends of the three-phase windings into the drive current;
an input end of the three-phase winding and a termination end of the three-phase winding are electrically connected to the circuit board in regions spaced apart from each other and from an output shaft of the motor when viewed in the axial direction of the housing;
6. The motor device according to claim 5, wherein the power circuit is mounted on the circuit board in an area adjacent to input ends of the three-phase windings.
the circuit board includes a board motor portion overlapping with the rotor and the stator when viewed in the axial direction of the housing, and an extension portion extending from the board motor portion to a side of the housing,
7. The motor device according to claim 6, wherein an input end of the three-phase winding is electrically connected to the circuit board in a region of the board motor part opposite the extension portion with respect to the output shaft of the motor when viewed in the axial direction of the housing.
The motor device according to claim 6, wherein the input and end terminals of the three-phase windings are electrically connected to the circuit board in an area that overlaps with the stator when viewed in the axial direction of the housing.
An angle sensor that detects a rotation angle of the output shaft is provided on the circuit board,
7. The motor device according to claim 6, wherein an input end and an end of the three-phase windings are electrically connected to the circuit board at a location spaced apart from the angle sensor.