Rotating electric machine and manufacturing method thereof

Abstract

The rotating electric machine includes: an electric motor having a rotating shaft; and a control unit for controlling the motor, the control unit including: a substrate unit having a first circuit board, a second circuit board, and a holding member disposed between the first circuit board and the second circuit board, the holding member holding the first circuit board and the second circuit board; a heat sink disposed between the motor and the substrate unit so as to face the first circuit substrate in the axial direction of the rotating shaft; and a fastening member fixing the substrate unit to the heat sink, the holding member having: a base portion; a first locking part which is connected to the base part and locks the first circuit board from a second surface of the first circuit board, said second surface being on the opposite side of the first surface facing the base part; and a second locking part which is connected to the base part and locks the second circuit board from a fourth surface of the second circuit board, the fourth surface being located on the opposite side of the third surface facing the base part, and a fastening member which passes through the substrate unit in the axial direction and is fastened to the heat sink.

Description

Technical Field

[0001] The present disclosure relates to a rotating electric machine and a method for manufacturing the same. Background Art

[0002] The rotating electric machine disclosed in Patent Document 1 has an electric motor and a control unit, the electric motor has a rotating shaft, and the control unit controls the electric motor. The control unit includes: a first circuit substrate and a second circuit substrate arranged in the axial direction of the rotating shaft; a spacer provided between the first circuit substrate and the second circuit substrate; and a connector assembly connected to the first circuit substrate and the second circuit substrate. When manufacturing the rotating electric machine, the connector assembly, the second circuit substrate, the spacer, and the first circuit substrate are sequentially arranged so that a common fixing member is inserted through the connector assembly, the second circuit substrate, the spacer, and the first circuit substrate. By fixing the end of the common fixing member to the heat sink, the connector assembly, the second circuit substrate, the spacer, and the first circuit substrate are fixed to the heat sink. Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Publication No. 2020-127334 Summary of the invention Technical problem to be solved by the invention

[0004] In the structure of Patent Document 1, since the first circuit substrate and the second circuit substrate cannot be fixed before being fixed by the common fixing member, it is difficult to assemble the first circuit substrate and the second circuit substrate to the heat sink with high accuracy. In the case where the first circuit substrate and the second circuit substrate are pre-fixed one by one relative to the heat sink before being fixed by the common fixing member in order to improve assembly accuracy, the manufacture of the rotating electrical machine becomes complicated, resulting in an increase in manufacturing cost.

[0005] The present disclosure is made to solve the above-mentioned problems, and an object thereof is to provide a rotating electrical machine and a manufacturing method thereof, which can assemble a first circuit substrate and a second circuit substrate with high accuracy and can be manufactured easily and at low cost. Technical solutions adopted to solve technical problems

[0006] The rotary electric machine disclosed in the present invention includes: a motor having a rotating shaft; and a control unit for controlling the motor, the control unit including: a substrate unit having a first circuit substrate and a second circuit substrate and a holding member, the holding member being arranged between the first circuit substrate and the second circuit substrate and holding the first circuit substrate and the second circuit substrate; a heat sink, the heat sink being arranged between the motor and the substrate unit in a manner opposed to the first circuit substrate in the axial direction of the rotating shaft; and a fastening member for fixing the substrate unit to the heat sink, the holding member including: a base; a first locking portion connected to the base and locking the first circuit substrate from a second surface of the first circuit substrate located on the opposite side of the first surface opposed to the base; and a second locking portion connected to the base and locking the second circuit substrate from a fourth surface of the second circuit substrate located on the opposite side of the third surface opposed to the base, the fastening member passing through the substrate unit in the axial direction and fastened to the heat sink.

[0007] The manufacturing method of the rotating electric machine disclosed in the present invention includes: a substrate unit assembling process, in which a substrate unit is assembled by holding a first circuit substrate and a second circuit substrate by a holding member; and a substrate unit fixing process, in which a fastening member is passed through the substrate unit in the axial direction of the rotating shaft of the motor, and the fastening member is fastened to the heat sink, thereby fixing the substrate unit to the heat sink. Effects of the Invention

[0008] According to the present disclosure, it is possible to provide a rotating electrical machine and a method for manufacturing the same, which can assemble a first circuit substrate and a second circuit substrate with high accuracy and can be manufactured easily and at low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is an exploded perspective view of the rotating electrical machine according to the first embodiment. Figure 2 This is a schematic cross-sectional view of the rotating electrical machine according to the first embodiment. Figure 3 This is a perspective view of the first circuit substrate according to the first embodiment. Figure 4 This is a perspective view of the second circuit substrate according to the first embodiment. Figure 5 This is a perspective view of the holding member according to the first embodiment. Figure 6 This is a perspective view of the substrate unit according to the first embodiment. Figure 7 This is a perspective view of the heat sink according to the first embodiment. Figure 8 This is a perspective view of the connector according to the first embodiment. Fig.9A It is a diagram for explaining the method for manufacturing the rotating electrical machine according to the first embodiment. Fig. 9B It is a diagram for explaining the method for manufacturing the rotating electrical machine according to the first embodiment. Fig. 9C It is a diagram for explaining the method for manufacturing the rotating electrical machine according to the first embodiment. Fig.9D It is a diagram for explaining the method for manufacturing the rotating electrical machine according to the first embodiment. Fig.9E It is a diagram for explaining the method for manufacturing the rotating electrical machine according to the first embodiment. Fig.9F It is a diagram for explaining the method for manufacturing the rotating electrical machine according to the first embodiment. Fig.10 This is a perspective view of an intermediate structure of the rotating electrical machine according to the second embodiment as viewed from below. Fig.11 It is along Fig.10 Cross-sectional view along line AA. Fig.12 This is a perspective view of a first circuit substrate according to the second embodiment. Fig.13 This is a perspective view of a second circuit substrate according to the second embodiment. Fig.14 This is a perspective view of a holding member according to the second embodiment. Fig.15 This is a perspective view of a holding member according to a modified example of the second embodiment. Fig.16 It is a schematic cross-sectional view of a rotating electrical machine according to a third embodiment. DETAILED DESCRIPTION

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In addition, the scope of the present disclosure is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical concept of the present disclosure.

[0011] Implementation Method 1 Figure 1 It is an exploded perspective view of the rotating electrical machine 100 according to the first embodiment. Figure 2 1 is a schematic cross-sectional view of a rotating electrical machine 100. The rotating electrical machine 100 includes a multi-phase winding type motor 1 and a control unit 2 for controlling the motor 1. The control unit 2 includes a first circuit board 21, a second circuit board 22, a board-to-board connector 23, a holding member 24, a heat sink 25, a fastening member 26, and a connector assembly 27.

[0012] like Figure 2 As shown, the motor 1 is mainly composed of a shaft 11, a rotor 12, a stator 13, a motor case 14, an armature winding 15, an annular wiring portion 16, a wiring terminal 17, a first bearing 18a, and a second bearing 18b.

[0013] In the following description, the direction in which the central axis O of the rotating shaft 11 of the motor 1 extends is sometimes referred to as the axial direction. The motor 1 and the control unit 2 are arranged in the axial direction. Sometimes, the side where the control unit 2 is located in the axial direction is referred to as the upper side, and the side where the motor 1 is located is referred to as the lower side. Sometimes, observation from the axial direction is referred to as top view. Sometimes, the direction intersecting the central axis O when viewed from top is referred to as the radial direction, and the direction around the central axis O is referred to as the circumferential direction.

[0014] The rotating shaft 11 , the rotor 12 , and the stator 13 are arranged coaxially. The rotating shaft 11 has an input end 11a located at the top and an output end 11b located at the bottom. A driving object (for example, a steering system of a vehicle) is connected to the output end 11b. The rotor 12 is fixed to the rotating shaft 11. A plurality of pairs of permanent magnets (not shown) are arranged on the outer peripheral surface of the rotor 12. These permanent magnets constitute magnetic poles. The stator 13 is provided so as to surround the outer circumference of the rotor 12. An air gap is formed between the outer circumferential surface of the rotor 12 and the inner circumferential surface of the stator 13. The air gap is formed over the entire circumference in the circumferential direction.

[0015] The motor housing 14 accommodates the rotating shaft 11, the rotor 12, and the stator 13. The motor housing 14 has a cylindrical portion 14a and a bottom portion 14b. The cylindrical portion 14a covers the stator 13 from the outer peripheral side. The stator 13 is fixed to the inner surface of the cylindrical portion 14a by heat press fitting or press fitting. The bottom portion 14b covers the lower end of the cylindrical portion 14a. An output side shaft through hole 14c for inserting the rotating shaft 11 is formed in the center of the bottom portion 14b when viewed from above. The upper end of the cylindrical portion 14a is covered by the heat sink 25 of the control unit 2.

[0016] The armature winding 15 is wound around the stator 13. The armature winding 15 includes a U-phase winding, a V-phase winding, and a W-phase winding. The annular wiring portion 16 is disposed above the stator 13. The annular wiring portion 16 is disposed close to the armature winding 15. The annular wiring portion 16 is connected to the end of the armature winding 15 by TIG welding or the like. The wiring terminal 17 extends upward from the annular wiring portion 16 through the heat sink 25. The wiring terminal 17 is electrically connected to the end of the armature winding 15 through the annular wiring portion 16. More specifically, the wiring terminal 17 is composed of three conductors, and the three conductors are electrically connected to the end of the U-phase winding, the end of the V-phase winding, and the end of the W-phase winding of the armature winding 15. The upper end of the wiring terminal 17 is connected to the first circuit substrate 21 of the control unit 2.

[0017] The input end 11a of the rotating shaft 11 is inserted into the first shaft through hole 61 formed in the heat sink 25. The output end 11b of the rotating shaft 11 is inserted into the output side shaft through hole 14c formed in the bottom 14b. The first bearing 18a is provided in the first shaft through hole 61. The second bearing 18b is provided in the output side shaft through hole 14c. The first bearing 18a and the second bearing 18b support the rotating shaft 11 so that it can rotate freely.

[0018] A sensor magnet 19 is mounted on the input end 11a of the rotating shaft 11. The sensor magnet 19 is fixed to the axial end face of the input end 11a by press-fitting. The sensor magnet 19 includes one or more pairs of permanent magnets. The sensor magnet 19 rotates together with the rotating shaft 11. Therefore, the magnetic field generated by the sensor magnet 19 changes with the rotation of the rotating shaft 11.

[0019] The control unit 2 controls the motor 1. In the axial direction, the second circuit board 22, the holding member 24, the first circuit board 21, and the heat sink 25 are arranged in this order from the top. The first circuit board 21, the second circuit board 22, the board connector 23, and the holding member 24 constitute the board unit 20.

[0020] The control unit 2 is covered from above by a cover 70 . The cover 70 is attached to the heat sink 25 . The board unit 20 (the first circuit board 21 , the second circuit board 22 , the board connector 23 , and the holding member 24 ) is accommodated in a space surrounded by the cover 70 and the heat sink 25 .

[0021] The first circuit board 21 is disposed between the holding member 24 and the heat sink 25 in the axial direction. The first circuit board 21 has a first surface 21a and a second surface 21b. The first surface 21a is the upper surface of the first circuit board 21, and the second surface 21b is the lower surface of the first circuit board 21.

[0022] The first circuit board 21 is mounted with an inverter circuit that drives the motor 1. The inverter circuit is composed of electronic components such as switching elements, a shunt resistor, and a smoothing capacitor. Among the above electronic components, the electronic component 28, which is a heating element that generates heat during the driving of the motor 1, is preferably arranged on the second surface 21b of the first circuit board 21. The electronic component 28 is in contact with the upper surface of the radiator 25 through a heat dissipation paste 29. The heat generated from the electronic component 28 is dissipated to the radiator 25 through the heat dissipation paste 29. In addition, the electronic component 28 can also be arranged on the first surface 21a of the first circuit board 21.

[0023] Figure 3 is a perspective view of the first circuit board 21 as viewed from above. In the following description, as Figure 3 shown, a direction along a plane of the first surface 21a of the first circuit board 21 is referred to as the first direction D1, and a direction orthogonal to the first direction D1 in the above plane is referred to as the second direction D2. The first direction D1 and the second direction D2 are orthogonal to the axial direction.

[0024] On the first circuit board 21, a second shaft through-hole 31, a motor terminal connection hole 32 (motor connection portion), a first fastening through-hole 33, a first positioning through-hole 34, a connection terminal connection hole 35 (first connector connection portion), and a connector positioning through-hole 37 are provided.

[0025] The second shaft through-hole 31 penetrates the first circuit board 21 in the axial direction. The second shaft through-hole 31 is arranged at a position that overlaps with the output-side shaft through-hole 14c when viewed from above. The second shaft through-hole 31 is for inserting the input end 11a of the rotating shaft 11.

[0026] The motor terminal connection hole 32 penetrates the first circuit board 21 in the axial direction. The motor terminal connection hole 32 is provided at the end of the first circuit board 21 in the second direction D2. Three motor terminal connection holes 32 are arranged in the first direction D1. The three motor terminal connection holes 32 are respectively connected to three conductors of the wiring terminal 17.

[0027] The first fastening through-hole 33 penetrates the first circuit board 21 in the axial direction. The first fastening through-hole 33 is provided at the outer edge portion of the first circuit board 21. In the present embodiment, a plurality of first fastening through-holes 33 are provided at both ends of the first circuit board 21 in the first direction D1 and both ends in the second direction D2. The first fastening through-hole 33 is for inserting the fastening member 26.

[0028] The first positioning through hole 34 penetrates the first circuit substrate 21 in the axial direction. The first positioning through hole 34 is provided at the outer edge of the first circuit substrate 21. In the present embodiment, a pair of first positioning through holes 34 are provided at both ends of the first circuit substrate 21 in the second direction D2. The first positioning through hole 34 is inserted through the first positioning protrusion 55 of the holding member 24 described later.

[0029] The connector terminal connection hole 35 penetrates the first circuit substrate 21 in the axial direction. The connector terminal connection hole 35 is provided at one end of the first circuit substrate 21 in the first direction D1. In the present embodiment, a plurality of connector terminal connection holes 35 are arranged in a row in the second direction D2. The connector terminal connection hole 35 is connected to a press-fit terminal 74 of the connector assembly 27 described later.

[0030] The connector positioning through hole 37 penetrates the first circuit substrate 21 in the axial direction. The connector positioning through hole 37 is provided at one end of the first circuit substrate 21 in the first direction D1. In the present embodiment, a pair of connector positioning through holes 37 is provided in a manner of being arranged on both sides of the plurality of connector terminal connection holes 35 in the second direction D2 when viewed from the first direction D1. The connector positioning through hole 37 is inserted through the connector positioning protrusion 75 of the connector assembly 27 described later.

[0031] Back to Figure 2 The second circuit substrate 22 is disposed above the first circuit substrate 21. The second circuit substrate 22 has a third surface 22a and a fourth surface 22b. The third surface 22a is the lower surface of the second circuit substrate 22, and the fourth surface 22b is the upper surface of the second circuit substrate 22.

[0032] A control circuit for controlling the driving of the motor 1 is mounted on the second circuit board 22. The control circuit is composed of a microcontroller for performing calculations for controlling the driving of the motor 1, a drive circuit for controlling a switching element, and the like.

[0033] A rotation sensor 30 is mounted on the third surface 22a of the second circuit substrate 22. The rotation sensor 30 is a magnetic sensor such as a magnetoresistive sensor (MR sensor) or a Hall sensor. The rotation sensor 30 is coaxially arranged with a sensor magnet 19 mounted on the rotating shaft 11. The sensor magnet 19 and the rotation sensor 30 are opposed to each other with a gap therebetween. The rotation sensor 30 detects changes in the magnetic field of the permanent magnet of the sensor magnet 19 that rotates with the rotating shaft 11 and converts it into an electrical signal. The rotation angle of the rotating shaft 11 is detected by the sensor magnet 19 and the rotation sensor 30. In addition, a rotary transformer, an optical sensor, etc. can also be used as the rotation sensor 30.

[0034] Figure 4 FIG. 2 is a perspective view of the second circuit substrate 22 as viewed from above. Figure 4As shown, the second circuit substrate 22 is provided with a second fastening through hole 41 , a second positioning through hole 42 and a cutout portion 43 .

[0035] The second fastening through hole 41 penetrates the second circuit substrate 22 in the axial direction. The second fastening through hole 41 is provided at the outer edge of the second circuit substrate 22. In the present embodiment, the plurality of second fastening through holes 41 are arranged at positions overlapping with the plurality of first fastening through holes 33 when viewed from above. The second fastening through hole 41 is inserted with the fastening member 26.

[0036] The second positioning through hole 42 penetrates the second circuit substrate 22 in the axial direction. The second positioning through hole 42 is provided at the outer edge of the second circuit substrate 22. In the present embodiment, the pair of second positioning through holes 42 is arranged at a position overlapping with the pair of first positioning through holes 34 when viewed from above. In addition, the first positioning through hole 34 and the second positioning through hole 42 may also be arranged at different positions when viewed from above. The second positioning through hole 42 is inserted by a second positioning protrusion 56 of the holding member 24 described later.

[0037] The cutout portion 43 is provided in a manner recessed inward from the end edge of the second circuit substrate 22 in the second direction D2. In the present embodiment, a pair of cutout portions 43 are provided at both ends of the second circuit substrate 22 in the second direction D2. The cutout portion 43 is formed at a position overlapping the motor terminal connection hole 32 when viewed from above. When the substrate unit 20 is viewed from the second circuit substrate 22 side in the axial direction, the cutout portion 43 exposes the motor terminal connection hole 32.

[0038] The length of the second circuit substrate 22 in the first direction D1 is shorter than the length of the first circuit substrate 21 in the first direction D1. When the substrate unit 20 is viewed from the second circuit substrate 22 along the axial direction, one end portion (connector terminal connection hole 35) of the first circuit substrate 21 in the first direction D1 is exposed from the second circuit substrate 22.

[0039] Back to Figure 2 The substrate-to-substrate connector 23 is disposed between the first circuit substrate 21 and the second circuit substrate 22 in the axial direction. The substrate-to-substrate connector 23 electrically connects the inverter circuit of the first circuit substrate 21 and the control circuit of the second circuit substrate 22. The substrate-to-substrate connector 23 is composed of a male connector mounted on the first circuit substrate 21 and a female connector mounted on the second circuit substrate 22. By fitting the male connector and the female connector together, the first circuit substrate 21 and the second circuit substrate 22 are electrically connected through the substrate-to-substrate connector 23. In addition, as the substrate-to-substrate connector 23, a bent substrate may be used, or a connector having a terminal with a press-fit shape at the front end may be used.

[0040] The holding member 24 is disposed axially between the first circuit substrate 21 and the second circuit substrate 22. The substrate unit 20 is assembled by holding the first circuit substrate 21 and the second circuit substrate 22 with the first circuit substrate 21 and the second circuit substrate 22 electrically connected by the substrate connector 23.

[0041] Figure 5 It is a perspective view of the holding member 24 as seen from above. Figure 6 It is a perspective view of the substrate unit 20 as seen from below. like Figure 5 As shown, the holding member 24 includes a base portion 51 , a first locking portion 52 , a second locking portion 53 , a spacer 54 , a first positioning protrusion 55 , a second positioning protrusion 56 , and a load transmission portion 57 .

[0042] The base 51 is a frame having an inner space. The base 51 is connected to the members 52 to 57 of the holding member 24. The inner space of the base 51 accommodates electronic components mounted on the first circuit substrate 21 and the second circuit substrate 22, including the rotation sensor 30. Thus, the inner space of the base 51 can be used to accommodate electronic components, and the substrate unit 20 can be miniaturized.

[0043] The first locking portion 52 locks the first circuit substrate 21 from the second surface 21b of the first circuit substrate 21 (that is, the surface of the first circuit substrate 21 located on the opposite side of the first surface 21a facing the base 51). Figure 6 As shown, a plurality of first locking portions 52 are arranged in a manner to surround the first circuit substrate 21. The first locking portion 52 has a first protrusion 52a extending downward (i.e., one side of the first circuit substrate 21) from the base 51 and a first locking claw 52b located at the front end of the first protrusion 52a. The first locking claw 52b has a first locking surface facing upward. The first locking surface of the first locking claw 52b abuts against the second surface 21b of the first circuit substrate 21, so that the first circuit substrate 21 is fixed to the retaining member 24 in the axial direction.

[0044] The second locking portion 53 locks the second circuit substrate 22 from the fourth surface 22b of the second circuit substrate 22 (that is, the surface of the second circuit substrate 22 located on the opposite side of the third surface 22a facing the base 51). Figure 6As shown, a plurality of second locking portions 53 are arranged in a manner to surround the second circuit substrate 22. The second locking portion 53 has a second protrusion 53a extending upward (i.e., the second circuit substrate 22 side) from the base 51 and a second locking claw 53b located at the front end of the second protrusion 53a. The second locking claw 53b has a second locking surface facing downward. The second locking surface of the second locking claw 53b is abutted against the fourth surface 22b of the second circuit substrate 22, and the second circuit substrate 22 is fixed to the holding member 24 in the axial direction.

[0045] The spacer 54 is cylindrical and extends in the axial direction. In the present embodiment, the plurality of spacers 54 are arranged at positions overlapping with the plurality of first fastening through holes 33 when viewed from above. One end of the spacer 54 in the axial direction abuts against the first circuit substrate 21, and the other end of the spacer 54 in the axial direction abuts against the second circuit substrate 22. The spacer 54 can ensure the interval between the first circuit substrate 21 and the second circuit substrate 22. The spacer 54 has a third fastening through hole 54a that penetrates the spacer 54 in the axial direction. The third fastening through hole 54 is inserted through the fastening member 26. When the substrate unit 20 is assembled, the second fastening through hole 41 of the second circuit substrate 22, the third fastening through hole 54a of the holding member 24, and the first fastening through hole 33 of the first circuit substrate 21 are sequentially arranged coaxially from above. The second fastening through hole 41, the third fastening through hole 54a, and the first fastening through hole 33 are connected to each other. Hereinafter, the second fastening through hole 41, the third fastening through hole 54a, and the first fastening through hole 33 are collectively referred to as the fastening through hole of the substrate unit 20.

[0046] The first positioning protrusion 55 is cylindrical and extends in the axial direction. In the present embodiment, a pair of first positioning protrusions 55 are provided corresponding to a pair of first positioning through holes 34. The first positioning protrusion 55 extends downward from the base 51. The first positioning protrusion 55 is inserted into the first positioning through hole 34. The first circuit substrate 21 is positioned relative to the retaining member 24 by the first positioning protrusion 55. The height of the first positioning protrusion 55 is higher than the height of the first locking portion 52. That is, the front end of the first positioning protrusion 55 is located below the front end of the first locking portion 52. Furthermore, the first positioning protrusion 55 is fitted into a fitting hole 64 of the heat sink 25 described later. Thus, the substrate unit 20 is positioned relative to the heat sink 25 .

[0047] The second positioning protrusion 56 is cylindrical and extends in the axial direction. In the present embodiment, a pair of second positioning protrusions 56 are provided corresponding to a pair of second positioning through holes 42. The second positioning protrusion 56 extends upward from the base 51. The second positioning protrusion 56 is inserted into the second positioning through hole 42. The second circuit substrate 22 is positioned relative to the retaining member 24 by the second positioning protrusion 56. The height of the second positioning protrusion 56 is higher than the height of the second locking portion 53. That is, the front end of the second positioning protrusion 56 is located higher than the front end of the second locking portion 53. In the present embodiment, the first positioning protrusion 55 and the second positioning protrusion 56 are arranged at overlapping positions in a plan view. However, the first positioning protrusion 55 and the second positioning protrusion 56 may be arranged at different positions in a plan view.

[0048] The load transfer portion 57 is arranged at a position overlapping with the heat dissipation paste 29 when viewed from above. The load transfer portion 57 includes a first contact portion 57a ​​contacting the first circuit substrate 21, a second contact portion 57b contacting the second circuit substrate 22, and a connection portion 57c connecting the first contact portion 57a ​​and the second contact portion 57b. The first contact portion 57a ​​is a protrusion provided on the lower surface of the base 51. The second contact portion 57b is a protrusion provided on the upper surface of the base 51. The connection portion 57c is a part of the base 51. When the rotating electric machine 100 is manufactured, the load applied to the second circuit substrate 22 is transferred to the first circuit substrate 21 through the load transfer portion 57.

[0049] Back to Figure 2 The heat sink 25 is disposed between the stator 13 and the substrate unit 20 (first circuit substrate 21) in the axial direction. The heat sink 25 is fitted into the cylindrical portion 14a of the motor housing 14. The heat sink 25 covers the stator 13 from above. The heat sink 25 defines a space for accommodating the rotor 12 and the stator 13 of the motor 1 and a space for accommodating the substrate unit 20 of the control unit 2.

[0050] Figure 7 25 is a three-dimensional view of the holding member 25 as viewed from above. Figure 7 As shown, the heat sink 25 is provided with a first shaft through hole 61 , a motor terminal through hole 62 , a fastening hole 63 , and a fitting hole 64 .

[0051] The first shaft through hole 61 penetrates the heat sink 25 in the axial direction. The first shaft through hole 61 is arranged at a position overlapping with the output-side shaft through hole 14c in a plan view. The input end 11a of the rotation shaft 11 is inserted through the first shaft through hole 61.

[0052] The motor terminal through-hole 62 penetrates the heat sink 25 in the axial direction. The motor terminal through-hole 62 is provided at the end of the heat sink 25 in the second direction D2. The three motor terminal through-holes 62 are arranged in a row in the first direction D1. The three motor terminal through-holes 62 are arranged at positions overlapping with the three motor terminal connection holes 32 when viewed from above. The three motor terminal through-holes 62 are respectively used to insert the three conductors of the wiring terminal 17. When viewed from above, the size of the motor terminal through-hole 62 is larger than the size of the wiring terminal 17. Therefore, when the wiring terminal 17 is inserted into the motor terminal through-hole 62, it is possible to prevent the wiring terminal 17 from contacting the motor terminal through-hole 62.

[0053] The fastening holes 63 are provided at the outer edge of the heat sink 25. The fastening holes 63 are recessed downward from the upper surface of the heat sink 25. In this embodiment, the fastening holes 63 are arranged at positions overlapping with the first fastening through holes 33 in a plan view. The fastening member 26 is fastened to the fastening holes 63.

[0054] The fitting holes 64 are provided at the outer edge of the heat sink 25. The fastening holes 64 are recessed downward from the upper surface of the heat sink 25. In this embodiment, the pair of fitting holes 64 are arranged at positions overlapping with the pair of first positioning through holes 34 in a plan view. The first positioning protrusions 55 are fitted into the fitting holes 64.

[0055] The fastening member 26 is used to fix the substrate unit 20 to the heat sink 25. In the present embodiment, a plurality of fastening members 26 are provided corresponding to a plurality of fastening through holes of the substrate unit 20. The fastening member 26 is inserted through the fastening through holes of the substrate unit 20 from the second circuit substrate 22 side and fastened to the fastening hole 63 of the heat sink 25. That is, the fastening member 26 penetrates the substrate unit 20 in the axial direction and is fastened to the heat sink 25.

[0056] The fastening member 26 is, for example, a screw. The fastening member 26 has a head portion that abuts against the second circuit substrate 22 and a shaft portion that extends axially from the head portion. The shaft portion of the fastening member 26 is inserted through the fastening through hole of the substrate unit 20 and fastened to the fastening hole 63 of the heat sink 25. When viewed from above, the outer shape of the head portion of the fastening member 26 is substantially the same as the outer shape of the spacer 54. In addition, the material of the fastening member 26 is preferably the same as that of the spacer 54. In this case, it is possible to suppress changes in the fastening force of the fastening member 26 with respect to the first circuit board 21 and the second circuit board 22 due to temperature changes.

[0057] The connector assembly 27 electrically connects the rotating electric machine 100 to an external power source, sensor, etc. The connector assembly 27 is provided on the lower surface of the heat sink 25. The connector assembly 27 is opposite to the first circuit substrate 21 via the heat sink 25. The connector assembly 27 is connected to the first circuit substrate 21. In addition, in the present embodiment, the connector assembly 27 is provided below the first circuit substrate 21, but the connector assembly 27 may also be provided above the first circuit substrate 21.

[0058] Figure 8 2 is a perspective view of the connector assembly 27. Figure 8 As shown, the connector assembly 27 has a power terminal 71 , a signal terminal 72 , a connector holding portion 73 , and a connector positioning protrusion 75 .

[0059] The power terminal 71 is connected to an external power source. The signal terminal 72 is connected to an external sensor or the like. Power from the external power source is supplied to the first circuit substrate 21 through the power terminal 71. Various signals from the external sensor or the like are supplied to the first circuit substrate 21 through the signal terminal 72. The power terminal 71 and the signal terminal 72 are held by a connector holding portion 73.

[0060] The ends of the power terminal 71 and the signal terminal 72 on the first circuit substrate 21 side are press-fit terminals 74 (first press-fit terminals). The press-fit terminals 74 extend from the connector holding portion 73 toward the first circuit substrate 21 side. The plurality of press-fit terminals 74 are respectively pressed into the plurality of connector terminal connection holes 35. The press-fit terminals 74 are electrically connected to the connector terminal connection holes 35 by contacting the conductive layer formed on the inner surface of the connector terminal connection holes 35.

[0061] The connector positioning protrusion 75 is formed in a cylindrical shape. In the present embodiment, a pair of connector positioning protrusions 75 are provided corresponding to a pair of connector positioning through holes 37. The connector positioning protrusion 75 extends from the connector holding portion 73 toward the first circuit substrate 21 side. The connector positioning protrusion 75 is inserted into the connector positioning through hole 37. The connector assembly 27 is positioned relative to the first circuit substrate 21 by the connector positioning protrusion 75. The height of the connector positioning protrusion 75 is higher than the height of the press-fit terminal 74. That is, the front end of the connector positioning protrusion 75 is located at a position closer to the first circuit substrate 21 side than the front end of the press-fit terminal 74.

[0062] Next, a description will be given of a method for manufacturing the rotating electrical machine 100. The method for manufacturing the rotating electrical machine 100 of the present embodiment includes a substrate unit assembling step, a substrate unit fixing step, a connector mounting step, and a cover mounting step.

[0063] In the board unit assembling step, the board unit 20 is assembled by holding the first circuit board 21 and the second circuit board 22 by the holding member 24 . Specifically, if Fig.9A As shown, the first positioning protrusion 55 is inserted into the first positioning through hole 34, and the first circuit substrate 21 is locked from the second surface 21b of the first circuit substrate 21 by the first locking portion 52. Thus, the first circuit substrate 21 is fixed to the holding member 24. The height of the first positioning protrusion 55 is higher than the height of the first locking portion 52. Therefore, in a state where the first circuit substrate 21 is positioned relative to the holding member 24 by the first positioning protrusion 55, the first circuit substrate 21 can be locked by the first locking portion 52. The second positioning protrusion 56 is inserted into the second positioning through hole 42, and the second circuit substrate 22 is locked from the fourth surface 22b of the second circuit substrate 22 by the second locking portion 53. Thus, the second circuit substrate 22 is fixed to the holding member 24. The height of the second positioning protrusion 56 is higher than the height of the second locking portion 53. Therefore, in a state where the second circuit substrate 22 is positioned relative to the holding member 24 by the second positioning protrusion 56, the second circuit substrate 22 can be locked by the second locking portion 53. Furthermore, by fitting the male connector of the inter-substrate connector 23 mounted on the first circuit substrate 21 and the female connector of the inter-substrate connector 23 mounted on the second circuit substrate 22 together, the first circuit substrate 21 and the second circuit substrate 22 are electrically connected via the inter-substrate connector 23 .

[0064] In the substrate unit fixing process, the substrate unit 20 is fixed to the heat sink 25 by the fastening member 26 . Specifically, if Fig. 9B As shown in FIG. 1 , the substrate unit 20 is arranged so that the first circuit substrate 21 faces the heat sink 25. The heat sink 25 is attached to the motor 1 in advance. like Fig. 9C As shown in FIG. 1 , the substrate unit 20 is placed on the upper surface of the heat sink 25. At this time, the first positioning protrusion 55 is inserted into the fitting hole 64 (see FIG. 1 ) of the heat sink 25. Fig. 9B ) so that the substrate unit 20 is positioned relative to the heat sink 25. The wiring terminal 17 is inserted into the motor terminal connection hole 32. In addition, the second circuit substrate 22 is subjected to a clamp or the like to move toward the heat sink 25 side ( Fig. 9C The load applied to the second circuit substrate 22 is transmitted to the first circuit substrate 21 through the load transmission portion 57. As a result, the first circuit substrate 21 is also pushed toward the heat sink 25, and the thermal paste 29 applied between the heat sink 25 and the electronic component 28 mounted on the first circuit substrate 21 is pressed open. Then, if Fig.9D As shown, the fastening member 26 is inserted into the fastening through hole of the substrate unit 20 from the second circuit substrate 22 side, and fastened to the fastening hole 63 of the heat sink 25. The wiring terminal 17 is electrically connected to the motor terminal connection hole 32 by soldering or the like. At this time, since the cutout portion 43 is provided on the second circuit substrate 22, it is possible to prevent the connection tool for connecting the wiring terminal 17 to the motor terminal connection hole 32 from interfering with the second circuit substrate 22.

[0065] In the connector mounting step, the connector assembly 27 is connected to the first circuit board 21 . Specifically, if Fig.9E As shown in FIG. 1 , the intermediate structure of the rotating electrical machine 100 after the substrate unit fixing step is turned upside down. The connector assembly 27 is placed opposite to the second surface 21b of the first circuit substrate 21. The connector positioning protrusion 75 (see FIG. 1 ) is positioned so that the connector assembly 27 is opposite to the second surface 21b of the first circuit substrate 21. Figure 7 ) is inserted into the connector positioning through hole 37 of the first circuit substrate 21. The connector assembly 27 is applied toward the first circuit substrate 21 side ( Fig.9E The press-fit terminal 74 is pressed into the connector terminal connection hole 35 of the first circuit substrate 21 by a load applied thereto (in the direction of the arrow). The height of the connector positioning protrusion 75 is higher than the height of the press-fit terminal 74. Therefore, the press-fit terminal 74 can be pressed into the connector terminal connection hole 35 in a state where the connector assembly 27 is positioned relative to the first circuit substrate 21 by the connector positioning protrusion 75. Here, when the press-fit terminal 74 is pressed into the connector terminal connection hole 35, a pushing force is applied to the first circuit substrate 21. By providing a load-bearing fixture (not shown) on the first surface 21a of the first circuit substrate 21, the load-bearing fixture can bear the pushing force applied to the first circuit substrate 21. Therefore, deformation of the first circuit substrate 21 can be suppressed, and poor connection of the press-fit terminal 74 due to insufficient insertion of the press-fit terminal 74 into the connector terminal connection hole 35 can be prevented. Then, the connector assembly 27 is screwed and fixed to the heat sink 25 by the second fastening member 77 .

[0066] like Fig.9F As shown, in the cover mounting step, the intermediate structure of the rotating electrical machine 100 after the connector mounting step is reversed upside down again. The cover 70 is mounted on the heat sink 25 from above. Thus, the rotating electrical machine 100 is completed.

[0067] As described above, the rotary electric machine 100 of the present embodiment includes the motor 1 having the rotating shaft 11 and the control unit 2 for controlling the motor 1. The control unit 2 includes: the substrate unit 20 including the first circuit substrate 21 and the second circuit substrate 22 and the holding member 24 disposed between the first circuit substrate 21 and the second circuit substrate 22 and holding the first circuit substrate 21 and the second circuit substrate 22; the heat sink 25 disposed between the motor 1 and the substrate unit 20 so as to face the first circuit substrate 21 in the axial direction; and the fastening member 26 for fixing the substrate unit 20 to the heat sink 25. The holding member 24 includes a base 51, a first locking portion 52 connected to the base 51 and locking the first circuit substrate 21 from the second surface 21b of the first circuit substrate 21, and a second locking portion 53 connected to the base 51 and locking the second circuit substrate 22 from the fourth surface 22b of the second circuit substrate 22. The fastening member 26 penetrates the substrate unit 20 in the axial direction and is fastened to the heat sink 25 .

[0068] In addition, the manufacturing method of the rotating electric machine 100 of the present embodiment includes a substrate unit assembly process and a substrate unit fixing process. In the substrate unit assembly process, the substrate unit 20 is assembled by holding the first circuit substrate 21 and the second circuit substrate 22 by the retaining member 24. In the substrate unit fixing process, the fastening member 26 is penetrated axially relative to the substrate unit 20 and the fastening member 26 is fastened to the heat sink 25, thereby fixing the substrate unit 20 to the heat sink 25.

[0069] According to the above-mentioned rotating electric machine 100 or the manufacturing method of the rotating electric machine 100, the first circuit substrate 21 and the second circuit substrate 22 are held by the holding member 24, so that the substrate unit 20 is assembled. Then, the substrate unit 20 is fixed to the heat sink 25 by the fastening member 26, so that the first circuit substrate 21 and the second circuit substrate 22 can be assembled to the heat sink 25 at one time with high precision. Since it is no longer necessary to assemble the circuit substrates 21 and 22 one by one, the manufacturing of the rotating electric machine 100 becomes easy. In addition, since the manufacturing line of the rotating electric machine 100 can be shared with the manufacturing line of the rotating electric machine whose control unit is composed of one circuit substrate, the manufacturing cost can be reduced. Furthermore, for example, when the rotation sensor 30 for detecting the rotation angle of the rotating shaft 11 is mounted on the first circuit substrate 21 or the second circuit substrate 22, if the positions of the first circuit substrate 21 and the second circuit substrate 22 relative to the rotating shaft 11 are offset, the detection accuracy of the rotation sensor 30 may be reduced. Since the first circuit substrate 21 and the second circuit substrate 22 can be assembled to the heat sink 25 with high accuracy, the positions of the first circuit substrate 21 and the second circuit substrate 22 relative to the rotating shaft 11 can be prevented from being offset, and the detection accuracy of the rotation sensor 30 can be prevented from being reduced.

[0070] Furthermore, the holding member 24 further includes a spacer 54 which is connected to the base portion 51 , extends in the axial direction, and abuts against the first circuit substrate 21 and the second circuit substrate 22 . The fastening member 26 is inserted through the spacer 54 . According to this structure, the interval between the first circuit substrate 21 and the second circuit substrate 22 can be ensured by the spacer 54. Therefore, the manufacture of the rotating electric machine 100 becomes easier. In addition, the substrate unit 20 can be fixed to the heat sink 25 using the spacer 54. Therefore, it is not necessary to additionally provide a fixing boss or the like for fixing the substrate unit 20 to the heat sink 25, so that the increase in the number of components can be suppressed, and the reduction in the mounting area of ​​the electronic components in the first circuit substrate 21 and the second circuit substrate 22 can be suppressed.

[0071] In addition, the retaining member 24 has a first positioning protrusion 55 and a second positioning protrusion 56, wherein the first positioning protrusion 55 is connected to the base 51, penetrates the first circuit substrate 21 in the axial direction, and is inserted into the heat sink 25, and the second positioning protrusion 56 is connected to the base 51 and penetrates the second circuit substrate 22 in the axial direction. According to this structure, the first circuit board 21 and the second circuit board 22 can be positioned relative to the heat sink 25 by the first positioning protrusion 55 and the second positioning protrusion 56. Therefore, the first circuit board 21 and the second circuit board 22 can be attached to the heat sink 25 with higher accuracy.

[0072] Furthermore, electronic components 28 are mounted on the first circuit board 21, and thermal grease 29 is provided between the heat sink 25 and the electronic components 28. The holding member 24 further includes a load transfer portion 57 which is arranged at a position overlapping with the thermal grease 29 in a plan view and abuts against the first circuit board 21 and the second circuit board 22. According to this structure, the load applied to the second circuit board 22 when manufacturing the rotary electric machine 100 is transmitted to the first circuit board 21 through the load transmission portion 57 , thereby allowing the thermal paste 29 provided between the heat sink 25 and the electronic component 28 to be pressed open.

[0073] In addition, the motor 1 includes a rotor 12, a stator 13, an armature winding 15, and a wiring terminal 17, wherein the rotor 12 is fixed to the rotating shaft 11, the stator 13 is arranged on the outer peripheral side of the rotor 12, the armature winding 15 is wound around the stator 13, and the wiring terminal 17 is electrically connected to the armature winding 15 and connected to the first circuit substrate 21. The first circuit substrate 21 has a motor terminal connection hole 32 for connecting the wiring terminal 17. The second circuit substrate 22 has a cutout portion 43, and when the substrate unit 20 is viewed from the second circuit substrate 22 side in the axial direction, the cutout portion 43 exposes the motor terminal connection hole 32. According to this structure, for example, a connection tool for connecting the wiring terminal 17 to the motor terminal connection hole 32 can be brought close to the connection portion between the wiring terminal 17 and the motor terminal connection hole 32 through the cutout portion 43. Therefore, the wiring terminal 17 and the motor terminal connection hole 32 can be easily connected through the cutout portion 43. Therefore, the manufacturing of the rotating electric machine 100 becomes easier.

[0074] Furthermore, when viewed from the axial direction, the outer shape of the head of the fastening member 26 is substantially the same as the outer shape of the spacer 54 . According to this structure, it is possible to suppress an increase in the space in which the head of the fastening member 26 is provided, and at the same time, the force generated when the fastening member 26 is fastened can be more reliably received by the spacer 54 .

[0075] In addition, the control unit 2 further includes a connector assembly 27, and the connector assembly 27 has a press-fit terminal 74 connected to the first circuit substrate 21. The first circuit substrate 21 has a connector terminal connection hole 35, and the connector terminal connection hole 35 is provided at one end of the first direction D1 of the first circuit substrate 21, and is connected to the press-fit terminal 74. When the substrate unit 20 is observed from the second circuit substrate 22 side along the axial direction, the length of the first direction D1 of the second circuit substrate 22 is shorter than the length of the first direction D1 of the first circuit substrate 21, so that one end of the first direction D1 of the first circuit substrate 21 is exposed from the second circuit substrate 22. According to this structure, the connector assembly 27 can be easily connected to the first circuit substrate 21 using the press-fit terminals 74. Therefore, the manufacture of the rotary electric machine 100 becomes easier. Furthermore, when the press-fit terminal 74 is connected to the connector terminal connection hole 35, a pushing force is applied to one end portion of the first circuit substrate 21 in the first direction D1. Since the above-mentioned one end portion of the first circuit substrate 21 is exposed from the second circuit substrate 22, a force-bearing fixture supporting the above-mentioned one end portion can be easily provided on the first circuit substrate 21. By bearing the pushing force applied to the first circuit substrate 21 by the force-bearing fixture, deformation of the first circuit substrate 21 can be suppressed. Furthermore, poor connection of the press-fit terminal 74 due to insufficient insertion amount of the press-fit terminal 74 toward the connector terminal connection hole 35 can be prevented.

[0076] Furthermore, the connector assembly 27 includes a connector positioning protrusion 75 that is inserted through the first circuit board 21 . According to this structure, since the connector assembly 27 is positioned relative to the first circuit substrate 21 by the connector positioning protrusions 75 , it is possible to more reliably connect the press-fit terminals 74 to the connector terminal connection holes 35 .

[0077] That is, the front end of the connector positioning protrusion 75 is located closer to the first circuit substrate 21 than the front end of the press-fit terminal 74 . According to this structure, the press-fit terminal 74 can be connected to the connector terminal connection hole 35 in a state where the connector assembly 27 is positioned relative to the first circuit substrate 21 by the connector positioning protrusion 75. Therefore, the press-fit terminal 74 can be connected to the connector terminal connection hole 35 more reliably.

[0078] Furthermore, the substrate unit 20 further includes an inter-substrate connector 23 that electrically connects the first circuit substrate 21 and the second circuit substrate 22 . According to such a configuration, the first circuit board 21 and the second circuit board 22 can be easily electrically connected via the inter-board connector 23 .

[0079] Implementation Method 2 Next, a rotating electrical machine 100A according to Embodiment 2 will be described. Since the basic structure of the rotating electrical machine 100A according to the present embodiment is the same as that of Embodiment 1, the description will be mainly focused on the differences.

[0080] Fig.10 This is a perspective view of an intermediate structure of the rotating electrical machine 100A as seen from below. Fig.11 yes Fig.10 AA section view. The present embodiment is different from the first embodiment in that a connector assembly 27A is connected to the first circuit board 21A and the second circuit board 22A.

[0081] like Fig.10 as well as Fig.11As shown, the connector assembly 27A has first press-fit terminals 81 connected to the first circuit substrate 21A and second press-fit terminals 82 connected to the second circuit substrate 22A, instead of the press-fit terminals 74 . The first press-fit terminal 81 is arranged at the center of the second direction D2 of the connector assembly 27A. The second press-fit terminal 82 is arranged on both sides of the first press-fit terminal 81 in the second direction D2. The height of the second press-fit terminal 82 is higher than that of the first press-fit terminal 81. That is, the front end of the second press-fit terminal 82 is located closer to the second circuit substrate 22A side than the front end of the first press-fit terminal 81.

[0082] In this embodiment, the length of the second circuit board 22A in the first direction D1 is substantially the same as the length of the first circuit board 21A in the first direction D1. The second circuit board 22A is provided to overlap one end of the first circuit board 21 in the first direction D1 in a plan view.

[0083] Fig.12 2 is a perspective view of the first circuit substrate 21A as viewed from above. Fig.12 As shown, a first connector terminal connection hole 38 (first connector connection portion) for connecting the first press-fit terminal 81 is provided in the first circuit substrate 21A, replacing the connector terminal connection hole 35. The first connector terminal connection hole 38 is provided at one end of the first circuit substrate 21A in the first direction D1. The first connector terminal connection hole 38 is provided in the central portion of the first circuit substrate 21A in the second direction D2.

[0084] A connector terminal through hole 39 for inserting the second press-fit terminal 82 is provided on the first circuit substrate 21A. The connector terminal through hole 39 is provided at one end of the first circuit substrate 21A in the first direction D1. The connector terminal through holes 39 are arranged on both sides of the first connector terminal connection hole 38 in the second direction D2. When viewed from above, the size of the connector terminal through hole 39 is larger than the size of the second press-fit terminal 82. Therefore, it is possible to prevent the second press-fit terminal 82 from contacting the connector terminal through hole 39 when the second press-fit terminal 82 is inserted into the connector terminal through hole 39. In addition, a cutout portion for preventing interference between the first circuit substrate 21A and the second press-fit terminal 82 may be formed on the first circuit substrate 21A instead of the connector terminal through hole 39.

[0085] Fig.13 2 is a perspective view of the second circuit substrate 22A as viewed from above. Fig.13 As shown, the second circuit substrate 22A is provided with a second connector terminal connection hole 45 (second connector connection portion) to which the second press-fit terminal 82 is connected. The second connector terminal connection hole 45 is provided at one end of the second circuit substrate 22A in the first direction D1.

[0086] Fig.14 24A is a three-dimensional view of the retaining member 24A as viewed from above. Fig.14 As shown, in the present embodiment, the retaining member 24A further includes a support portion 58. The support portion 58 is frame-shaped with an inner space. The support portion 58 is connected to one end portion of the base 51 in the first direction D1. The support portion 58 abuts against the first circuit substrate 21A and the second circuit substrate 22A. The support portion 58 is arranged in a manner to surround the first connector terminal connection hole 38 of the first circuit substrate 21A when viewed from above. The support portion 58 supports the periphery of the first connector terminal connection hole 38 of the first circuit substrate 21A. The front end of the first press-fit terminal 81 connected to the first connector terminal connection hole 38 is accommodated in the inner space of the support portion 58. Thus, the first press-fit terminal 81 can be prevented from coming into contact with the retaining member 24A.

[0087] In the manufacturing method of the rotating electrical machine 100A of the present embodiment, in the connector installation step, the connector assembly 27A is connected to the first circuit substrate 21A and the second circuit substrate 22A. In addition, since the other steps (substrate unit assembly step, substrate unit fixing step, and cover installation step) are the same as those in the first embodiment, they are omitted here.

[0088] In the connector installation process, first, the intermediate structure of the rotating electric machine 100A after the substrate unit fixing process is performed is turned upside down. The connector assembly 27A is placed opposite to the second surface 21b of the first circuit substrate 21A. The connector positioning protrusion 75 is inserted into the connector positioning through hole 37 of the first circuit substrate 21A. At this time, the second press-fit terminal 82 is inserted into the connector terminal through hole 39 of the first circuit substrate 21A. A load-bearing clamp 200 is set on the fourth surface 22b of the second circuit substrate 22A. A load is applied to the connector assembly 27A toward the first circuit substrate 21A side. As a result, the first press-fit terminal 81 is pressed into the first connector terminal connection hole 38 of the first circuit substrate 21A, and the second press-fit terminal 82 is pressed into the second connector terminal connection hole 45 of the second circuit substrate 22A.

[0089] Here, when the first press-fit terminal 81 is pressed into the first connector terminal connection hole 38, a pushing force is applied to the first circuit substrate 21A. In addition, when the second press-fit terminal 82 is pressed into the second connector terminal connection hole 45, a pushing force is applied to the second circuit substrate 22A. In the present embodiment, the support portion 58 is disposed between the first circuit substrate 21A and the second circuit substrate 22A in a manner that surrounds the first connector terminal connection hole 38. Therefore, the first connector terminal connection hole 38 of the first circuit substrate 21A is supported around the support portion 58. In addition, a load-bearing clamp 200 is provided on the fourth surface 22b of the second circuit substrate 22A. Thus, the pushing force applied to the first circuit substrate 21A can be borne via the support portion 58 and through the load-bearing clamp 200. In addition, the pushing force applied to the second circuit substrate 22A can be borne through the load-bearing clamp 200. Therefore, the deformation of the first circuit substrate 21A can be suppressed, and the poor connection of the first press-fit terminal 81 due to insufficient insertion of the first press-fit terminal 81 into the first connector terminal connection hole 38 can be prevented. In addition, the deformation of the second circuit substrate 22A can be suppressed, and the poor connection of the second press-fit terminal 82 due to insufficient insertion of the second press-fit terminal 82 into the second connector terminal connection hole 45 can be prevented. Then, the connector assembly 27 is screwed and fixed to the heat sink 25 by the second fastening member 77 .

[0090] As described above, in the rotary electric machine 100A of the present embodiment, the connector assembly 27A further includes the second press-fit terminal 82 connected to the second circuit substrate 22A. The second circuit substrate 22A includes the second connector terminal connection hole 45, which is provided at one end portion of the second circuit substrate 22A in the first direction D1 and is connected to the second press-fit terminal 82. The holding member 24A further includes the support portion 58, which is provided in a manner to surround the first connector terminal connection hole 38 when viewed from the axial direction, and abuts against the first circuit substrate 21A and the second circuit substrate 22A. According to this structure, the signal etc. from the external sensor can be directly inputted from the connector assembly 27A to the second circuit substrate 22A. It is no longer necessary to provide the inter-substrate connector 23 with a terminal etc. for transmitting the above-mentioned signal etc. from the first circuit substrate 21A to the second circuit substrate 22A, and the inter-substrate connector 23 can be miniaturized. Therefore, the mounting area of ​​the electronic components in the first circuit substrate 21A and the second circuit substrate 22A can be expanded. In addition, the first connector terminal connection hole 38 of the first circuit substrate 21A is supported by the support portion 58. When the first press-fit terminal 81 and the second press-fit terminal 82 are connected to the first connector terminal connection hole 38 and the second connector terminal connection hole 45, respectively, a pushing force acts on the first circuit substrate 21A and the second circuit substrate 22A. Since the support portion 58 can be used to withstand the above-mentioned pushing force, deformation of the first circuit substrate 21A and the second circuit substrate 22A can be suppressed. In addition, poor connection of the first press-fit terminal 81 due to insufficient insertion amount of the first press-fit terminal 81 toward the first connector terminal connection hole 38 can be suppressed, and poor connection of the second press-fit terminal 82 due to different insertion amounts of the second press-fit terminal 82 toward the second connector terminal connection hole 45 can be suppressed.

[0091] Modification of Implementation Example 2 Fig.15 This is a perspective view of a holding member 24A according to a modified example of the second embodiment, as viewed from below. In this modification, the retaining member 24A further includes a guide portion 84. The guide portion 84 includes a guide through hole 84a that penetrates the guide portion 84 in the axial direction. The plurality of guide through holes 84a are arranged at positions overlapping with the plurality of second connector terminal connection holes 45 when viewed from above. The lower end portion (the end portion on one side) of the guide through hole 84a is formed into a tapered shape that gradually expands in diameter as it moves downward (on one side). In the connector installation process, the second press-fit terminal 82 is inserted into the guide through hole 84a from below (one side). Since the lower end of the guide through hole 84a is formed in a tapered shape, the second press-fit terminal 82 can be smoothly inserted into the guide through hole 84a. The second press-fit terminal 82 is guided toward the second connector terminal connection hole 45 through the guide through hole 84a, and is pressed into the second connector terminal connection hole 45. In addition, in a plan view, the size of the guide through hole 84a is larger than the size of the second press-fit terminal 82. Therefore, when the second press-fit terminal 82 is inserted into the guide through hole 84a, the second press-fit terminal 82 is prevented from contacting the guide through hole 84a.

[0092] As described above, the holding member 24A of the present modification has the guide portion 84 having the guide through-hole 84a through which the second press-fit terminal 82 is inserted from one side. The end portion on one side of the guide through-hole 84a is formed in a tapered shape. According to this structure, the second press-fit terminal 82 is guided toward the second connector terminal connection hole 45 by the guide portion 84, so that the displacement between the position of the second press-fit terminal 82 and the position of the second connector terminal connection hole 45 can be prevented. As a result, the second press-fit terminal 82 can be reliably inserted into the second connector terminal connection hole 45. In addition, the second press-fit terminal 82 can be prevented from being bent or the second connector terminal connection hole 45 is damaged due to the displacement between the position of the second press-fit terminal 82 and the position of the second connector terminal connection hole 45. In addition, since the end of one side of the guide through hole 84a is formed into a tapered shape, the second press-fit terminal 82 can be smoothly inserted into the guide through hole 84a. Therefore, the reliability of the connection portion of the second press-fit terminal 82 can be improved without increasing the number of components.

[0093] Implementation 3 Next, a rotating electrical machine 100B according to Embodiment 3 will be described. Since the basic structure of the rotating electrical machine 100B according to the present embodiment is the same as that of Embodiment 1, the description will be mainly focused on the differences.

[0094] In the third embodiment, the difference from the first embodiment is that the control unit 2 further includes a third circuit substrate 91, a second holding member 92, and a second substrate-to-substrate connector 93. The substrate unit 20A is composed of the first circuit substrate 21, the second circuit substrate 22, the substrate-to-substrate connector 23, the holding member 24, the third circuit substrate 91, the second holding member 92, and the second substrate-to-substrate connector 93.

[0095] The third circuit board 91 is arranged above the second circuit board 22. The second inter-board connector 93 is arranged between the second circuit board 22 and the third circuit board 91 in the axial direction. The second inter-board connector 93 electrically connects the second circuit board 22 and the third circuit board 91.

[0096] In this embodiment, the second positioning protrusion 56 of the holding member 24 axially penetrates the second circuit board 22 and the third circuit board 91. The second positioning protrusion 56 positions the second circuit board 22 and the third circuit board 91 relative to the holding member 24.

[0097] The second holding member 92 is disposed between the second circuit substrate 22 and the third circuit substrate 91 in the axial direction. The second holding member 92 holds the second circuit substrate 22 and the third circuit substrate 91. Similar to the holding member 24 of the first embodiment, the second holding member 92 has a third locking portion (not shown) that locks the second circuit substrate 22 from the third surface 22a of the second circuit substrate 22 and a fourth locking portion (not shown) that locks the third circuit substrate 91 from the upper surface of the third circuit substrate 91.

[0098] The second holding member 92 has a second spacer 92 a and a second load transmitting portion 92 b . The second spacer 92a is cylindrical and extends in the axial direction. The plurality of second spacers 92a are arranged at positions overlapping with the plurality of spacers 54 when viewed from above. One end of the second spacer 92a in the axial direction abuts against the second circuit substrate 22, and the other end of the second spacer 92a in the axial direction abuts against the third circuit substrate 91. The second spacer 92a can ensure the spacing between the second circuit substrate 22 and the third circuit substrate 91. The second spacer 92a has a fourth fastening through hole that penetrates the second spacer 92a in the axial direction. The fourth fastening through hole is for the fastening member 26 to be inserted through. The load transfer portion 92b is arranged at a position overlapping with the thermal paste 29 when viewed from above. The second load transfer portion 92b contacts the second circuit substrate 22 and the third circuit substrate 91. When manufacturing the rotary electric machine 100, the load applied to the third circuit substrate 91 is transferred to the first circuit substrate 21 via the second load transfer portion 92b, the second circuit substrate 22, and the load transfer portion 57. As a result, the first circuit substrate 21 is also pressed toward the heat sink 25, and the thermal paste 29 applied between the heat sink 25 and the electronic component 28 mounted on the first circuit substrate 21 is pressed open.

[0099] In the manufacturing method of the rotary electric machine 100B of the present embodiment, in the substrate unit assembly process, the substrate unit 20A is assembled by holding the first circuit substrate 21, the second circuit substrate 22, and the third circuit substrate 91 by the holding member 24 and the second holding member 92. At this time, since the second circuit substrate 22 and the third circuit substrate 91 are positioned relative to the holding member 24 by the second positioning protrusion 56, the substrate unit 20A can be assembled with the same accuracy as in the first embodiment. In addition, since other steps (substrate unit assembling step, connector mounting step, and cover mounting step) are the same as those in Embodiment 1, description thereof is omitted here.

[0100] As described above, in the rotating electrical machine 100B of the present embodiment, the substrate unit 20A further includes the third circuit substrate 91 and the second holding member 92 , which is disposed between the second circuit substrate 22 and the third circuit substrate 91 and holds the second circuit substrate 22 and the third circuit substrate 91 . According to this structure, even if the number of circuit substrates of the control unit 2 is increased, the same effect as that of the first embodiment can be obtained. That is, the substrate unit 20A is assembled by holding the first circuit substrate 21, the second circuit substrate 22, and the third circuit substrate 91 by the holding member 24 and the second holding member 92. Then, the substrate unit 20A is fixed to the heat sink 25 by the fastening member 26, so that the first circuit substrate 21, the second circuit substrate 22, and the third circuit substrate 91 can be assembled to the heat sink 25 at one time with high precision. Since it is no longer necessary to assemble the circuit substrates 21, 22, and 91 one by one, the manufacture of the rotating electric machine 100B becomes easy. In addition, since the manufacturing line of the rotating electric machine 100B can be shared with the manufacturing line of the rotating electric machine whose control unit is composed of one circuit substrate, the manufacturing cost can be reduced. In addition, even when the number of circuit boards of the control unit 2 is four or more, the same effect can be obtained.

[0101] In addition, the various embodiments may be combined, or the various embodiments may be appropriately modified or omitted.

[0102] The heat sink 25 may be formed integrally with the motor case 14 of the rotary electric machine 100 . For example, the fastening members 26 only need to fix the substrate unit 20 to the heat sink 25 , and are not limited to screws. The number and configuration of the fastening member 26, the first locking portion 52, the second locking portion 53 of the retaining member 24, the spacer 54, the first positioning protrusion 55 and the second positioning protrusion 56, and the press-fit terminal 74 of the connector assembly 27 can be appropriately changed according to the specifications of the rotating electrical machine 100. Explanation of symbols

[0103] 1 motor; 2 control unit; 11 rotating shaft; 12 rotor; 13 stator; 15 armature winding; 16 annular wiring portion; 17 wiring terminal; 20, 20A substrate unit; 21, 21A first circuit substrate; 22, 22A second circuit substrate; 23 substrate-to-substrate connector; 24, 24A retaining member; 25 heat sink; 26 fastening member; 27, 27A connector assembly; 28 electronic component; 29 heat dissipation paste; 32 motor terminal connection hole (motor connection portion); 35 connector terminal connection hole (first connector connection portion); 38 first connector terminal connection hole (first Connector connecting portion); 39 connector terminal through hole; 43 cutout portion; 45 second connector terminal connecting hole (second connector connecting portion); 51 base; 52 first locking portion; 53 second locking portion; 54 spacer; 55 first positioning protrusion; 56 second positioning protrusion; 57 load transfer portion; 58 supporting portion; 74 press-fit terminal (first press-fit terminal); 75 connector positioning protrusion; 81 first press-fit terminal; 82 second press-fit terminal; 84 guide portion; 84a guide through hole; 91 third circuit substrate; 92 second retaining member; 100, 100A, 100B rotating motor.

Claims

1. A rotating electrical machine, comprising: An electric motor having a rotating shaft; as well as a control unit, wherein the control unit controls the electric motor, The control unit comprises: a substrate unit including a first circuit substrate and a second circuit substrate and a holding member, wherein the holding member is disposed between the first circuit substrate and the second circuit substrate and holds the first circuit substrate and the second circuit substrate; a heat sink disposed between the motor and the substrate unit so as to face the first circuit substrate in the axial direction of the rotating shaft; and a fastening member that fixes the substrate unit to the heat sink, The retaining member comprises: base; a first locking portion connected to the base portion and locking the first circuit substrate from a second surface of the first circuit substrate that is located on the opposite side of the first surface that faces the base portion; and a second locking portion connected to the base portion and locking the second circuit substrate from a fourth surface of the second circuit substrate located on the opposite side of the third surface facing the base portion, The fastening member penetrates the base plate unit in the axial direction and is fastened to the heat sink.

2. The rotating electrical machine according to claim 1, characterized in that The holding member further includes a spacer connected to the base, extending in the axial direction, and abutting against the first circuit substrate and the second circuit substrate. The fastening member is inserted through the spacer.

3. The rotating electrical machine according to claim 1 or 2, characterized in that: The retaining member has: a first positioning protrusion, the first positioning protrusion being connected to the base, penetrating the first circuit substrate in the axial direction and being inserted into the heat sink; as well as A second positioning protrusion is connected to the substrate and penetrates the second circuit substrate in the axial direction.

4. The rotating electrical machine according to any one of claims 1 to 3, characterized in that Electronic components are mounted on the first circuit substrate. A heat dissipation paste is provided between the heat sink and the electronic component. The holding member further includes a load transmission portion that is disposed at a position overlapping the thermal grease when viewed from the axial direction and that abuts against the first circuit substrate and the second circuit substrate.

5. The rotating electrical machine according to any one of claims 1 to 4, characterized in that The motor includes a rotor fixed to the rotating shaft, a stator arranged on the outer circumference of the rotor, an armature winding wound on the stator, and a wiring terminal electrically connected to the armature winding and connected to the first circuit substrate. The first circuit substrate has a motor connection portion to which the wiring terminal is connected. The second circuit substrate has a cutout portion that exposes the motor connection portion when the substrate unit is viewed from the second circuit substrate side along the axial direction.

6. The rotating electrical machine according to claim 2, wherein: When viewed from the axial direction, the outer shape of the head of the fastening member is substantially the same as the outer shape of the spacer.

7. The rotating electrical machine according to any one of claims 1 to 6, characterized in that The control unit further includes a connector assembly having a first press-fit terminal connected to the first circuit substrate. The first circuit substrate has a first connector connection portion, which is disposed at an end portion of the first circuit substrate in a first direction orthogonal to the axial direction and is connected to the first press-fit terminal. The length of the second circuit substrate in the first direction is shorter than the length of the first circuit substrate in the first direction, so that when the substrate unit is observed from the second circuit substrate side along the axial direction, the one end portion of the first circuit substrate in the first direction is exposed from the second circuit substrate.

8. The rotating electrical machine according to claim 7, characterized in that The connector assembly also has a second press-fit terminal connected to the second circuit substrate. The second circuit substrate has a second connector connection portion, which is disposed at one end of the second circuit substrate in the first direction and is connected to the second press-fit terminal. The holding member further includes a support portion that is provided so as to surround the first connector connecting portion when viewed from the axial direction and that abuts against the first circuit substrate and the second circuit substrate.

9. The rotating electrical machine according to claim 8, characterized in that The holding member has a guide portion, and the guide portion has a guide through hole through which the second press-fit terminal is inserted from one side. The end portion on the one side of the guide through hole is formed in a tapered shape.

10. The rotating electrical machine according to any one of claims 7 to 9, characterized in that The connector assembly has a connector positioning protrusion inserted through the first circuit substrate.

11. The rotating electrical machine according to claim 10, characterized in that The front end of the connector positioning protrusion is located closer to the first circuit substrate than the front end of the first press-fit terminal.

12. The rotating electrical machine according to any one of claims 1 to 11, characterized in that The substrate unit further includes a third circuit substrate and a second holding member that is disposed between the second circuit substrate and the third circuit substrate and holds the second circuit substrate and the third circuit substrate.

13. The rotating electrical machine according to any one of claims 1 to 12, characterized in that The substrate unit further includes an inter-substrate connector that electrically connects the first circuit substrate and the second circuit substrate.

14. A method for manufacturing a rotating electrical machine, comprising: a substrate unit assembling step in which the substrate unit is assembled by holding the first circuit substrate and the second circuit substrate by a holding member; as well as A substrate unit fixing step is performed in which a fastening member is passed through the substrate unit in the axial direction of the rotation shaft of the motor and the fastening member is fastened to the heat sink, thereby fixing the substrate unit to the heat sink.

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