JP2015107036A - Motor control device and motor unit including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor control device in which a temperature of a power element is less likely to increase, and to provide a motor unit including the motor control device.SOLUTION: A motor control device 40 includes: a first housing 41 formed by a metal material; a second housing which forms a housing space with the first housing 41; a motor drive part 50 including a power substrate 51 disposed on a placement surface 41B of the first housing 41 and a laminate power element mounted on the power substrate 51; and a motor control part 60 disposed on the placement surface 41B and having a control board 70 which is in a standing posture relative to the power substrate 51. The control board 70 includes: a first plane part 71; a second plane part 72; and a first bending part 74. The first plane part 71 and the second plane part 72 enclose the power substrate 51.

Description

  The present invention relates to a motor control device and a motor unit including the device.

  The motor of Patent Literature 1 includes a circuit board, a holding member, a power element, and a housing. The housing is formed in a cylindrical shape. The housing accommodates a circuit board and a holding member. The holding member is formed in a triangular shape. The circuit board is wound around the holding member. The power element is mounted on the outer surface of the circuit board.

JP 2010-213451 A

  A circuit board is accommodated in the housing through a gap with the housing. For this reason, it is difficult for the heat of the power element to move to the housing. For this reason, there exists a possibility that the temperature of a power element may become high.

  The present invention has been created to solve the above-described problems, and an object of the present invention is to provide a motor control device in which the temperature of the power element is unlikely to increase and a motor unit including this device.

  The motor control device has a mounting surface, a first housing formed of a metal material, and a second housing fixed to the first housing and forming an accommodation space between the first housing. And a power board disposed on the placement surface in the accommodation space, a motor drive unit having a power element mounted on the power board, and disposed on the placement surface in the accommodation space, A motor control unit having a control board that stands in a standing position with respect to the power board, wherein the control board includes a first plane part, a second plane part, and the first plane part and the second plane part. The first flat part and the second flat part surround the power substrate. The first flat part and the second flat part are connected to each other.

  According to the configuration of the motor control device, the heat of the power element moves to the first housing via the power board. For this reason, it becomes difficult for the temperature of a power element to become high. Further, the motor control device can be miniaturized by taking a posture in which the control board stands with respect to the power board and surrounding the power board.

  In one form of the motor control device, the motor control device further includes a motor connector, the control board is parallel to the first plane part, and is disposed with a gap from the first plane part, and A second bent portion that connects the third plane portion and the second plane portion to each other; and the motor connector is surrounded by the first plane portion, the second plane portion, and the third plane portion. A connector housing in which a horizontally long insertion hole and a vertically long insertion hole are formed, and a plurality of relay terminals held in the connector housing, wherein the plurality of relay terminals are in the horizontally long insertion holes One of the plurality of relay terminals is disposed in the vertically long insertion hole, the horizontally long insertion hole corresponds to a bus bar terminal, and the longitudinal direction of the connector housing A shape extending the longitudinal through hole corresponds to the bus bar terminal, and a shape elongated in the lateral direction of the connector housing.

  In one form of the motor control device, the power control connector further includes a power connector, and at least a part of the power connector is disposed on the power substrate in the accommodation space, and sandwiches the power substrate and the power element together with the first housing. It is out.

  The power connector and the first housing sandwich the power board and the power element. For this reason, a motor control apparatus can be reduced in size compared with the structure assumed that the power connector and the first housing do not sandwich the power board and the power element.

  In one form of the motor control device, the second housing has a fitting portion fitted into the motor, and a housing portion formed on the opposite side of the fitting portion from the motor side, The accommodating portion has a larger diameter than the fitting portion, the control board has a substrate main body and a protruding portion protruding from the substrate main body, and the substrate main body is accommodated in the accommodating portion, The protruding portion is accommodated in the fitting portion.

  Since the control board has the protruding portion, the area can be increased. Moreover, since a protrusion part is accommodated in a fitting part, it is suppressed that an accommodating part enlarges. Therefore, it is possible to achieve both suppression of an increase in size of the motor control device and an increase in the area of the control board.

  The motor unit includes the motor control device.

  In the motor control device and the motor unit, the temperature of the power element is hardly increased.

The perspective view of the motor unit of an embodiment. The longitudinal cross-sectional view of a part of the motor unit of the embodiment. A part of bus bar unit of a motor unit of an embodiment, and a bottom part of a rotor. The top view of the motor control device of an embodiment. An exploded perspective view of a motor control device of an embodiment. The bottom view of the 2nd housing of the motor control device of an embodiment. The disassembled perspective view of a part of bus bar unit of the motor unit of the embodiment and the motor control device. The top view of the control board which shows the positional relationship of the control board and 2nd housing of the motor control apparatus of embodiment. The side view of a part of control board and 2nd housing which shows the positional relationship of the control board and 2nd housing of embodiment. The top view which shows the manufacture process of the control board of embodiment.

  The configuration of the motor unit 1 will be described with reference to FIGS. In FIG. 2, the speed reduction unit 30 and the internal structure of the power supply unit 80 and the motor connector 90 are omitted. Further, as shown in FIG. 3, the “first direction ZD” indicates a direction along the arrow Y1 in a plane direction orthogonal to the axial direction ZA. The “second direction ZE” is a direction along the arrow Y2 in the plane direction orthogonal to the axial direction ZA, and is orthogonal to the first direction ZD.

  The motor unit 1 is mounted on an electric power steering device (not shown). The electric power steering device controls the motor unit 1 so that an assist torque corresponding to a steering torque is generated when the driver operates a steering member (not shown). The electric power steering device transmits the rotation of the steering member to the rack and pinion mechanism (not shown) via the steering shaft 2 and converts it into a linear motion of the rack shaft (not shown).

  The motor unit 1 includes a motor 10, a speed reduction unit 30, and a motor control device 40. The motor 10, the speed reduction unit 30, and the motor control device 40 are arranged side by side in the axial direction ZA along the central axis J of the motor 10. The motor control device 40 is disposed between the motor 10 and the speed reduction unit 30 in the axial direction ZA.

  As shown in FIG. 2, the motor 10 is a three-phase motor. The motor 10 includes a rotor 11, a stator 14, a housing 16, and a bus bar unit 20. The motor 10 is an inner rotor type in which the rotor 11 is disposed inside the stator 14 in the radial direction ZB. The rotor 11 has an output shaft 12 and a permanent magnet 13. The output shaft 12 and the permanent magnet 13 rotate integrally. The stator 14 has a coil 15. The housing 16 is formed in a bottomed cylindrical shape. The housing 16 accommodates the rotor 11, the stator 14, and the bus bar unit 20.

  The bus bar unit 20 has six bus bar terminals 21 and a terminal holding part 22. The bus bar terminal 21 is formed of a copper plate. Two six bus bar terminals 21 are connected to each phase coil. The bus bar terminal 21 is electrically connected to the motor control device 40. The terminal holding part 22 is formed of a resin material. The terminal holding part 22 holds the bus bar terminal 21. In the terminal holding portion 22, a protruding portion 22 </ b> A extending in the axial direction ZA is formed in a part of the circumferential direction ZC. A connecting portion 21A that is a tip portion of the bus bar terminal 21 protrudes in the axial direction ZA from the protruding portion 22A.

  As shown in FIG. 3, the two connecting portions 21A at the center in the second direction ZE among the connecting portions 21A of the six bus bar terminals 21 have a longitudinal direction parallel to the second direction ZE in plan view. The short direction is a shape parallel to the first direction ZD. Of the connection portions 21A of the six bus bar terminals 21, the four connection portions 21A on both sides in the second direction ZE have a longitudinal direction parallel to the first direction ZD and a short side direction in the second direction ZE in plan view. The shape is parallel to

  As shown in FIG. 1, the speed reduction unit 30 includes a housing 31 and a worm gear (not shown). The housing 31 is made of a metal material. An example of the metal material is aluminum. The worm gear is accommodated in the housing 31. The worm gear includes a worm shaft and a worm wheel (both not shown) meshed with each other. The worm shaft is connected to the output shaft 12 (see FIG. 2) of the motor 10. The worm wheel is fixed to the steering shaft 2.

  The motor control device 40 controls driving of the motor 10. The motor control device 40 includes a first housing 41 and a second housing 42. Each housing 41, 42 is made of a metal material. An example of the metal material is aluminum. The first housing 41 is fixed to the housing 31 of the speed reduction unit 30. The second housing 42 is fixed to the first housing 41. The second housing 42 is fixed to the motor 10 on the side opposite to the first housing 41 in the axial direction ZA.

The detailed configuration of the motor control device 40 will be described with reference to FIGS. In FIG. 5, the relay terminal 98 is shown in a simplified manner.
As shown in FIG. 4, the motor control device 40 includes a motor drive unit 50, a motor control unit 60, a power supply unit 80, and a motor connector 90 in addition to the first housing 41 and the second housing 42 (see FIG. 5). have. The motor drive unit 50, the motor control unit 60, the power supply unit 80, and the motor connector 90 are accommodated in an accommodation space SA (see FIG. 2) formed by the first housing 41 and the second housing 42. The power supply unit 80 and the motor connector 90 are arranged side by side with a gap in the first direction ZD. The motor control unit 60 outputs a motor control signal to the motor driving unit 50. When a motor control signal is input, the motor drive unit 50 drives the motor 10 by supplying a predetermined voltage and current to the motor 10 based on the power from the power supply unit 80.

  In the following description, “front direction ZD1” indicates a direction from the motor connector 90 toward the power supply unit 80 in the first direction ZD. The “rear direction ZD2” indicates a direction from the power supply unit 80 toward the motor connector 90 in the first direction ZD.

  The first housing 41 is disposed coaxially with the output shaft 12. The first housing 41 has a fitting portion 41A and a through hole 41C. A mounting surface 41B is formed at the end of the fitting portion 41A in the axial direction ZA. The placement surface 41B is a plane that intersects the axial direction ZA. The output shaft 12 (see FIG. 2) of the motor 10 passes through the through hole 41C.

  As shown in FIG. 5, the second housing 42 is disposed coaxially with the output shaft 12. The second housing 42 has a housing part 42A and a fitting part 42B. The accommodating portion 42A and the fitting portion 42B are integrated by being molded from the same material.

  The accommodating portion 42A is formed in a substantially cylindrical shape. The outer diameter of the accommodating portion 42A is slightly larger than the outer diameter of the housing 16 of the motor 10 (see FIG. 2). The accommodating portion 42 </ b> A is fitted into the fitting portion 41 </ b> A of the first housing 41.

  The fitting portion 42B is formed in a bottomed cylindrical shape. The fitting portion 42B is formed on the side opposite to the first housing 41 with respect to the accommodating portion 42A. The outer diameter of the fitting part 42B is smaller than the outer diameter of the accommodating part 42A. The fitting portion 42 </ b> B is fitted to the housing 16.

  As shown in FIG. 6, the fitting portion 42B is formed with a bus bar insertion hole 42C, a through hole 42E, and three recesses 42D. The three concave portions 42D are formed on the peripheral wall of the fitting portion 42B. The recess 42D is formed in a curved shape that is recessed from the inner peripheral surface of the peripheral wall of the fitting portion 42B to the outside in the radial direction ZB. As shown in FIG. 2, the protruding portion 22A of the bus bar unit 20 and the connecting portion 21A of the bus bar terminal 21 are inserted into the bus bar insertion hole 42C. The output shaft 12 is inserted into the through hole 42E.

  As shown in FIG. 4, the motor drive unit 50 includes two motor drive units 50A and 50B. Each motor drive unit 50A, 50B constitutes a drive circuit that drives a part of the power supply circuit and the motor 10 (see FIG. 2). In the present embodiment, when one of the motor drive units 50A and 50B drives the motor 10 in a normal state and one of the motor drive units 50A and 50B breaks down, instead of one of the motor drive units 50A and 50B, The other of the motor drive units 50A and 50B drives the motor 10. Each motor drive unit 50 </ b> A, 50 </ b> B is fixed to the placement surface 41 </ b> B of the first housing 41. The motor driving units 50A and 50B are arranged with a gap in the second direction ZE.

  As shown in FIG. 5, the motor driving unit 50 </ b> A includes a power board 51, three laminated power elements 52 as power elements, two capacitors 53, a plurality of connection pins 54, and three motor side connection terminals 55. And three power supply side connection terminals (not shown).

The power substrate 51 is formed in a flat plate shape. The power substrate 51 is disposed on the placement surface 41B.
The three laminated power elements 52 are mounted on the main surface 51 </ b> A of the power board 51. The three laminated power elements 52 are arranged in a portion of the power board 51 on the front direction ZD1 side. Each laminated power element 52 has two switching elements (not shown) connected in series with each other. Each laminated power element 52 constitutes a switching arm of each phase coil.

  The two capacitors 53 are mounted on the main surface 51 </ b> A of the power board 51. The two capacitors 53 extend in the axial direction ZA from the main surface 51A. The capacitor 53 constitutes a part of the power supply circuit and has a function of removing noise of power supplied to the laminated power element 52.

  The plurality of connection pins 54 are mounted on the outer edge in the second direction ZE on the main surface 51 </ b> A of the power board 51. The plurality of connection pins 54 electrically connect the motor drive unit 50A and the motor control unit 60.

  The motor side connection terminal 55 is mounted on the main surface 51 </ b> A of the power board 51 at the end on the back direction ZD <b> 2 side. The motor side connection terminal 55 electrically connects the power board 51 and the motor connector 90. The power supply side connection terminal is mounted on the main surface 51 </ b> A of the power board 51 on the front side ZD <b> 1 side. The power supply side connection terminal electrically connects the laminated power element 52 and the power supply unit 80. The motor driving unit 50B has the same configuration as the motor driving unit 50A.

As shown in FIG. 4, the motor control unit 60 includes a sensor connector 61, a plurality of electronic components 62, and a control board 70.
The control board 70 is formed in a U shape in plan view. The control board 70 is a multilayer printed board. The multilayer printed circuit board has an opening on the front direction ZD1 side. The control board 70 is configured by thermocompression bonding in a state where a thermoplastic film on which a conductor pattern (not shown) is formed is laminated. The control board 70 includes a first plane part 71, a second plane part 72, a third plane part 73, a first bent part 74, and a second bent part 75.

  As FIG. 5 shows, the 1st plane part 71, the 2nd plane part 72, and the 3rd plane part 73 are formed in flat form. The 1st plane part 71 and the 3rd plane part 73 are mutually arrange | positioned in parallel. The 1st plane part 71, the 3rd plane part 73, and the 2nd plane part 72 are arrange | positioned mutually orthogonally. The first bent portion 74 and the second bent portion 75 are portions where the control board 70 is bent. The first bent portion 74 connects the first flat portion 71 and the second flat portion 72 to each other. The second bent portion 75 connects the second plane portion 72 and the third plane portion 73 to each other.

  The first plane portion 71 has a first inner surface 71X and a first outer surface 71Y. The first inner surface 71X and the first outer surface 71Y are planes along the axial direction ZA and the first direction ZD. A connection pin 54 of the motor drive unit 50B is connected to an end of the first inner surface 71X on the first housing 41 side in the axial direction ZA.

  As shown in FIG. 5, the first plane portion 71 has a substrate body 71A and a protruding portion 71C. The substrate body 71A is formed in a rectangular shape in which the first direction ZD is the longitudinal direction. A screw insertion hole 71B is formed at the center of the substrate body 71A in the first direction ZD. A fixing screw 43 is inserted into the screw insertion hole 71B. The protruding portion 71C is formed in a rectangular shape in which the first direction ZD is the longitudinal direction. The protruding portion 71C protrudes from the end of the substrate body 71A opposite to the first housing 41 toward the opposite side of the first housing 41. The protruding portion 71C is formed in a portion on the back surface direction ZD2 side of the substrate body 71A.

  As shown in FIG. 4, the second flat surface portion 72 has a second inner surface 72X and a second outer surface 72Y. The second inner surface 72X and the second outer surface 72Y are planes along the axial direction ZA and the second direction ZE.

  As shown in FIG. 5, the second planar portion 72 has a substrate body 72A and a protruding portion 72B. The substrate body 72A is formed in a rectangular shape in which the second direction ZE is the longitudinal direction. The protrusion 72B is formed in a rectangular shape in which the second direction ZE is the longitudinal direction. The protruding portion 72B protrudes from the end of the substrate body 72A opposite to the first housing 41 toward the opposite side of the first housing 41. The protrusion 72B is formed at the center of the substrate body 72A in the second direction ZE.

  As shown in FIG. 4, the third plane portion 73 has a third inner surface 73X and a third outer surface 73Y. The third inner surface 73X and the third outer surface 73Y are planes along the axial direction ZA and the first direction ZD.

  As shown in FIG. 5, the third plane portion 73 has a substrate body 73A and a protruding portion 73C. The substrate body 73A is formed in a rectangular shape in which the first direction ZD is the longitudinal direction. A screw insertion hole 73B is formed at the end of the third plane portion 73 on the side in the front direction ZD1. A fixing screw 43 is inserted into the screw insertion hole 73B. The protrusion 73C is formed in a rectangular shape in which the second direction ZE is the longitudinal direction. The protruding portion 73C protrudes from the end of the substrate body 73A opposite to the first housing 41 toward the opposite side of the first housing 41. The protruding portion 73C is formed at the center of the substrate body 73A in the first direction ZD.

A conductive pattern (not shown) is formed on each of the bent portions 74 and 75.
The sensor connector 61 is mounted on the end portion on the front direction ZD1 side in the first outer surface 71Y of the first flat surface portion 71. A torque sensor (not shown) for detecting torque applied to the steering shaft 2 (see FIG. 1) and a rotation angle detecting means (not shown) of the motor 10 are electrically connected to the sensor connector 61. An example of the rotation angle detection means is a resolver.

  The electronic component 62 includes a first inner surface 71X and a first outer surface 71Y of the first plane portion 71, a second inner surface 72X and a second outer surface 72Y of the second plane portion 72, and a third inner surface 73X of the third plane portion 73 and It is mounted on the third outer surface 73Y. The electronic component 62 is not mounted on the bent portions 74 and 75. The electronic component 62 constitutes a control circuit that controls driving of the motor 10 (see FIG. 2).

The power supply unit 80 includes a power supply connector 81 and a choke coil 85. The power supply unit 80 is electrically connected to a vehicle battery (not shown).
The power connector 81 has a connector housing 82. The connector housing 82 is fixed to the first housing 41. The connector housing 82 has a housing main body 83 and two fixing portions 84. The fixing portion 84 is formed in a columnar shape. The two fixing portions 84 are formed on the back surface direction ZD2 side of the housing body 83 and on both sides of the housing body 83 in the second direction ZE.

  The choke coil 85 is accommodated in the housing body 83. The choke coil 85 is electrically connected to each of a connection terminal (not shown) of the power connector 81, a power supply side connection terminal (not shown) of the motor drive unit 50A, and a power supply side connection terminal (not shown) of the motor drive unit 50B. Connected. The choke coil 85 constitutes a part of the power supply circuit and has a function of reducing noise of power supplied to the six laminated power elements 52 (see FIG. 5).

The motor connector 90 has a connector housing 90A and six relay terminals 98.
Connector housing 90A is formed of a resin material. The connector housing 90A has a first holding member 91 and a second holding member 94 formed as individual parts. The first holding member 91 and the second holding member 94 are combined with each other.

The first holding member 91 has a terminal holding portion 92 and a pair of leg portions 93. The terminal holding portion 92 and the pair of leg portions 93 are integrated by being molded from the same material.
The terminal holding portion 92 is formed in a T shape in plan view. The terminal holding part 92 has six holding holes 92A.

  The six holding holes 92A are arranged with a gap therebetween in the second direction ZE. The holding hole 92A is formed in a rectangular shape in plan view. The longitudinal direction of the four holding holes 92A on both sides of the second direction ZE is a direction along the first direction ZD, and the short direction of the four holding holes 92A on both sides of the second direction ZE is the second direction ZE. It becomes the direction along. The short direction of the two holding holes 92A in the center of the second direction ZE is a direction along the first direction ZD, and the long direction of the two holding holes 92A in the center of the second direction ZE is the second direction ZE. It becomes the direction along. A relay terminal 98 is accommodated in each holding hole 92A.

  The leg portions 93 are formed at both ends of the terminal holding portion 92 in the second direction ZE. The leg portion 93 extends from the terminal holding portion 92 to the first housing 41 side. Each leg portion 93 is formed with two substrate holding portions 93A.

  The second holding member 94 has a terminal cover portion 95 and a pair of leg cover portions 97. The terminal cover portion 95 and the pair of leg cover portions 97 are integrated by being molded from the same material.

  The terminal cover portion 95 is formed in a T shape in plan view. The terminal cover portion 95 is formed with two horizontally long insertion holes 96A and four vertically long insertion holes 96B. The terminal cover 95 covers the relay terminal 98 in the axial direction ZA.

  As shown in FIG. 4, the horizontally long insertion hole 96 </ b> A and the vertically long insertion hole 96 </ b> B are long holes. The horizontally long insertion hole 96A extends in the second direction ZE, that is, the longitudinal direction of the connector housing 90A. The two horizontally long insertion holes 96 </ b> A are formed in the center portion of the terminal cover portion 95 in the second direction ZE and the end portion of the terminal cover portion 95 on the back surface direction ZD <b> 2 side. The two horizontally long insertion holes 96A are formed with a gap in the second direction ZE.

  The vertically long insertion hole 96B extends in the first direction ZD, that is, the short direction of the connector housing 90A. Of the four vertically long insertion holes 96B, two vertically long insertion holes 96B are formed in the terminal cover portion 95 at a portion on one side in the second direction ZE than the two horizontally long insertion holes 96A. The two vertically long insertion holes 96B are formed with a gap in the second direction ZE. Of the four vertically long insertion holes 96B, the remaining two vertically long insertion holes 96B are formed in the terminal cover 95 on the other side in the second direction ZE than the two horizontally long insertion holes 96A. The remaining two vertically long insertion holes 96B are formed with a gap in the second direction ZE.

  As shown in FIG. 7, the direction of each insertion hole 96A, 96B and the direction of the connecting portion 21A of the bus bar terminal 21 are equal to each other. The connection portion 21A of the bus bar terminal 21 is inserted through each of the insertion holes 96A and 96B. Thereby, the connection portion 21 </ b> A of the bus bar terminal 21 is connected to the relay terminal 98.

The leg cover part 97 is formed at both ends of the terminal cover part 95 in the second direction ZE. Each leg cover portion 97 is formed with two substrate holding portions 97A.
By the two substrate holding portions 93A of the first holding member 91 and the two substrate holding portions 97A of the second holding member 94, the boundary portion between the first flat portion 71 and the first bent portion 74, the second flat portion 72. And a boundary portion between the third flat portion 73 and the second bent portion 75, and a boundary portion between the second flat portion 72 and the second bent portion 75 are sandwiched in the axial direction ZA. It is.

With reference to FIG. 4 and FIG. 5, the arrangement configuration of each component of the motor control device 40 will be described.
As shown in FIG. 4, the motor control unit 60 surrounds the motor driving unit 50. The first plane portion 71 of the control board 70 extends along the outer edge of the power board 51 of the motor drive section 50B in the second direction ZE. The second flat surface portion 72 extends along the outer edge on the back direction ZD2 side in the power board 51 of the motor driving portion 50. The third plane portion 73 extends along the outer edge of the power board 51 of the motor drive unit 50A in the second direction ZE.

The motor drive unit 50, the power supply unit 80, and the motor connector 90 are disposed in a space surrounded by the first plane unit 71, the second plane unit 72, and the third plane unit 73.
The motor connector 90 is disposed across the power board 51 of the motor driving unit 50A and the power board 51 of the motor driving unit 50B in the second direction ZE. The terminal holding portion 92 is disposed with a gap in the axial direction ZA with respect to the power board 51. A motor side connection terminal 55 is disposed between the terminal holding portion 92 and the power board 51. As shown in FIG. 5, the two leg portions 93 are disposed on the main surface 51A of the power board 51 of the motor drive unit 50A and the motor drive unit 50B. The leg portion 93 is fixed to the first housing 41 by a fixing screw 44. The power boards 51 of the motor drive unit 50A and the motor drive unit 50B are fixed to the first housing 41 by the fixing screws 44 while being sandwiched between the first housing 41 and the two leg portions 93.

  As shown in FIG. 4, the motor connector 90 is disposed at a position adjacent to the second planar portion 72 with a gap in the first direction ZD. Further, the motor connector 90 is disposed at a position adjacent to the ends of the first flat surface portion 71 and the third flat surface portion 73 in the back surface direction ZD2 with a gap in the second direction ZE.

  The four capacitors 53 of the motor drive unit 50 are disposed between the power supply unit 80 and the motor connector 90 in the first direction ZD. The capacitor 53 on the back side ZD2 side is disposed at a position adjacent to the motor connector 90 in the first direction ZD and the second direction ZE. The four capacitors 53 are disposed inside the radial direction ZB of the fitting portion 42 </ b> B of the second housing 42.

  The power board 51 of the motor driving unit 50A and the power board 51 of the motor driving unit 50B are fixed by a fixing screw 45 in a state of being sandwiched between the first housing 41 and the power connector 81 in the axial direction ZA. The laminated power element 52 of each motor drive unit 50 </ b> A, 50 </ b> B is sandwiched between the power board 51 and the power connector 81.

  The power connector 81 and the control board 70 are fixed by the fixing screw 43 with one of the fixing parts 84 supporting the first flat part 71 of the control board 70, and the other of the fixing parts 84 is the third flat part of the control board 70. It is fixed by a fixing screw 43 in a state where 73 is supported.

The positional relationship between the second housing 42 and the control board 70 will be described with reference to FIGS.
As shown in FIG. 8, both end portions of the first plane portion 71 and the third plane portion 73 in the first direction ZD, both end portions of the second plane portion 72 in the second direction ZE, and each bent portion 74, 75 is located on the outer side in the radial direction ZB from the inner peripheral surface of the fitting portion 42B of the second housing 42. The protrusions 71C, 72B, and 73C of the flat portions 71 to 73 are located on the inner side in the radial direction ZB than the inner peripheral surface of the fitting portion 42B. The protrusions 71C, 72B, 73C are accommodated in the recesses 42D in the circumferential direction ZC. The protrusions 71C, 72B, 73C and the recesses 42D form a gap in the radial direction ZB.

  As shown in FIG. 9, the substrate main body 71A of the first flat surface portion 71 is accommodated in the accommodating portion 42A and not accommodated in the fitting portion 42B. Although not shown, the same applies to the substrate main body 72A of the second flat surface portion 72, the substrate main body 73A of the third flat surface portion 73, and the bent portions 74 and 75.

  The protruding portion 71C of the first flat surface portion 71 is accommodated in the fitting portion 42B. Although not shown, the same applies to the protruding portion 72B of the second flat surface portion 72 and the protruding portion 73C of the third flat surface portion 73.

With reference to FIG. 10, the manufacturing method of the control board 70 is demonstrated.
The sheet-like substrate 100 is formed with a plurality of control substrates (hereinafter referred to as “control substrates 70A, 70B...”) Before being bent. The control boards 70A, 70B... Extend in the lateral direction ZF of the board 100. The control substrates 70A, 70B,... Are formed side by side in the longitudinal direction ZG of the substrate 100.

  As an example, the control boards 70A and 70B adjacent in the vertical direction ZG are opposite to each other in the vertical direction ZG and the horizontal direction ZF. The control board 70 </ b> A is formed in the order of the third plane portion 73, the second bent portion 75, the second plane portion 72, the first bent portion 74, and the first plane portion 71. The control board 70 </ b> B is formed in the order of the first flat part 71, the first bent part 74, the second flat part 72, the second bent part 75, and the third flat part 73.

  A protrusion 71C of the control board 70B is located between the lateral directions ZF of the protrusions 72B and 73C of the control board 70A. The protrusion 72B of the control board 70B is located between the protrusions 72B and 71C of the control board 70A in the lateral direction ZF. Further, the protrusion 73C of the control board 70B is located at a position adjacent to the protrusion 71C of the control board 70A on the opposite side of the protrusion 72B in the lateral direction ZF. The protrusions 71C, 72B, and 73C of the control board 70A are positions that overlap the protrusions 71C, 72B, and 73C of the control board 70B in the vertical direction ZG. In FIG. 9, the control boards 70C and 70D have the same arrangement relationship as the control boards 70A and 70B.

  The operation of the motor unit 1 will be described. The “first assumption configuration” indicates a configuration in which the longitudinal direction of the connection portion 21A of the six bus bar terminals 21 is parallel to the first direction ZD. The “second hypothetical configuration” indicates a configuration in which the longitudinal direction of the connection portion 21A of the six bus bar terminals 21 is parallel to the second direction ZE. Further, in the description regarding the first hypothetical configuration and the second hypothetical configuration, the same reference numerals as those of the motor control device 40 are given for convenience.

  As shown in FIG. 5, the heat of the laminated power element 52 moves to the first housing 41 via the power substrate 51. Therefore, the temperature of the laminated power element 52 is unlikely to increase. In addition, the heat of the laminated power element 52 that has moved to the first housing 41 moves to the housing 31 of the speed reduction unit 30. Therefore, the effect of preventing the temperature of the laminated power element 52 from becoming high is enhanced.

  As shown in FIG. 4, the motor connector 90 is disposed in a space surrounded by the flat portions 71 to 73 of the control board 70. For this reason, the motor connector 90 is brought close to the rotor 11 (see FIG. 3) of the motor 10 in the radial direction ZB.

  As shown in FIG. 7, the protruding portion 22 </ b> A of the bus bar unit 20 faces the motor connector 90 in order to connect to the motor connector 90. For this reason, the protrusion 22 </ b> A needs to be close to the rotor 11.

  On the other hand, in the first hypothetical configuration, since the longitudinal direction of the connecting portion 21A is parallel to the first direction ZD, the dimension of the protruding portion 22A in the first direction ZD is increased. For this reason, if the protrusion 22A is to be disposed corresponding to the motor connector 90, the protrusion 22A may interfere with the rotor 11.

  Therefore, as shown in FIG. 3, in the motor control device 40 of the present embodiment, the two connection portions 21 </ b> A at the center in the second direction ZE among the connection portions 21 </ b> A of the six bus bar terminals 21 are viewed in plan view. In FIG. 5, the longitudinal direction of the connecting portion 21A is parallel to the second direction ZE. For this reason, the dimension of the 1st direction ZD of the center part of 22 A of protrusion parts can be made small. For this reason, it is avoided that 22 A of protrusion parts interfere with the rotor 11. FIG.

  In the second hypothetical configuration, the distance in the second direction ZE from the connection portion 21A of the bus bar terminal 21 at one end in the second direction ZE to the connection portion 21A of the bus bar terminal 21 at the other end in the second direction ZE is increased. . In the case of the second hypothetical configuration, the motor connector 90 has a horizontally long insertion hole 96A instead of the vertically long insertion hole 96B. As a result, the dimension of the motor connector 90 in the second direction ZE increases. For this reason, in order to arrange the motor connector 90 in the space surrounded by the flat portions 71 to 73 of the control board 70, it is necessary to increase the dimension of the control board 70 in the second direction ZE. For this reason, it is difficult to reduce the size of the motor control device 40 in the second direction ZE.

  On the other hand, as shown in FIG. 7, in the motor control device 40 of the present embodiment, four connection portions 21 </ b> A on both sides in the second direction ZE among the connection portions 21 </ b> A of the six bus bar terminals 21. Is a shape in which the longitudinal direction of the connecting portion 21A is parallel to the first direction ZD in plan view. For this reason, the distance in the second direction ZE from the connection portion 21A of the bus bar terminal 21 at one end in the second direction ZE to the connection portion 21A of the bus bar terminal 21 at the other end in the second direction ZE is reduced. For this reason, four vertically long insertion holes 96B are formed on both sides of the motor connector 90 in the second direction ZE. Therefore, since the dimension of the motor connector 90 in the second direction ZE is reduced, the dimension of the control board 70 in the second direction ZE can be reduced. Therefore, the motor control device 40 can be reduced in size in the second direction ZE.

According to the motor unit 1 of the present embodiment, the following effects can be obtained.
(1) The power board 51 of the motor drive unit 50 is fixed to the mounting surface 41 </ b> B of the first housing 41. A laminated power element 52 is mounted on the main surface 51 </ b> A of the power substrate 51. According to this configuration, since the heat of the laminated power element 52 moves to the first housing 41, the temperature of the laminated power element 52 is unlikely to increase.

  (2) The control board 70 takes a standing posture with respect to the power board 51 and surrounds the power board 51. According to this configuration, the motor control device 40 can be downsized in the radial direction ZB.

  (3) The two horizontally long insertion holes 96A of the motor connector 90 have a shape extending in the second direction ZE. The four vertically long insertion holes 96B have a shape extending in the first direction ZD. According to this configuration, the motor control device 40 can be downsized in the second direction ZE.

  In addition, the two connecting portions 21A at the center portion in the second direction ZE among the connecting portions 21A of the bus bar terminal 21 have a shape in which the longitudinal direction is parallel to the second direction ZE. Of the connection portions 21A of the six bus bar terminals 21, the four connection portions 21A on both sides in the second direction ZE have a shape in which the longitudinal direction is parallel to the first direction ZD. According to this configuration, the protruding portion 22 </ b> A of the terminal holding portion 22 can be brought close to the rotor 11. For this reason, the motor 10 can be reduced in size in the radial direction ZB.

  (4) The motor drive unit 50 includes two motor drive units 50A and 50B in order to provide redundancy of the motor control device 40. For this reason, six bus bar terminals 21 are required. In the motor connector 90 of the present embodiment, an increase in the size of the motor connector 90 in the second direction ZE is suppressed by the arrangement configuration of the two horizontally long insertion holes 96A and the four vertically long insertion holes 96B. Therefore, even if the number of bus bar terminals 21 is large and the motor connector 90 is disposed in a space surrounded by the flat portions 71 to 73, an increase in the dimension of the control board 70 in the second direction ZE is suppressed. .

(5) The power connector 81 and the power board 51 sandwich the laminated power element 52. According to this configuration, the motor control device 40 can be downsized in the radial direction ZB.
(6) The protrusions 71 </ b> C, 72 </ b> B, 73 </ b> C of the control board 70 are accommodated in the fitting portion 42 </ b> B of the second housing 42. Each of the substrate bodies 71 </ b> A to 73 </ b> A is accommodated in the accommodating portion 42 </ b> A of the second housing 42. According to this configuration, the dimension in the axial direction ZA of the accommodating portion 42 </ b> A of the second housing 42 can be reduced. Further, the area of the control board 70 is increased by the protrusions 71C, 72B, and 73C. Therefore, both the downsizing of the motor control device 40 in the axial direction ZA and the increase in the area of the control board 70 can be achieved.

  (7) A recess 42D is formed in the fitting portion 42B of the second housing 42. According to this configuration, since gaps are formed between the protrusions 71C, 72B, 73C and the recesses 42D of the flat surface portions 71 to 73, the space between the protrusions 71C, 72B, 73C and the second housing 42 is formed. The insulation distance can be increased.

  (8) The motor connector 90 is disposed in a space surrounded by the flat portions 71 to 73 of the control board 70. According to this configuration, the dimension of the first planar portion 71 in the first direction ZD and the third planar portion 73 are compared with the configuration in which the motor connector 90 is assumed to be disposed on the back direction ZD2 side with respect to the control board 70. The dimension in the first direction ZD can be increased. For this reason, the area of the control board 70 can be increased.

  (9) The motor connector 90 sandwiches the control board 70 between the board holding portions 93A and 97A. According to this configuration, the number of screw insertion holes formed in the control board 70 can be reduced as compared with a configuration that is assumed to be fixed to the first housing 41 with a fixing screw in order to fix the position of the control board 70. Can do. Therefore, it is possible to take a wide area in the control substrate 70 where the conductive pattern can be formed.

  (10) In the control boards 70A and 70B, the directions of the control boards 70A are opposite to each other in the vertical direction ZG and the horizontal direction ZF. According to this configuration, the number of control boards 70 in the board 100 can be increased.

  The motor control device and the motor unit include an embodiment different from the above embodiment. Hereinafter, modifications of the above embodiment corresponding to other embodiments of the motor control device and the motor unit will be described. Note that the following modifications can be combined with each other within a technically feasible range.

-At least one of the protrusions 71C, 72B, 73C of the control board 70 can be omitted.
The protrusions 71C, 72B, 73C of the control board 70 can be accommodated in the accommodating portion 42A.
One of the first plane part 71 and the third plane part 73 of the control board 70 can be omitted.

  The motor driving unit 50B of the motor driving unit 50 can be omitted. When the motor drive unit 50B is omitted, the total of the horizontally long insertion holes 96A and the vertically long insertion holes 96B of the second holding member 94, the relay terminal 98, and the holding holes 92A of the first holding member 91 are three. In addition, there are three bus bar terminals 21.

All of the connection portions 21A of the six bus bar terminals 21 can be changed to a shape whose longitudinal direction is parallel to the first direction ZD or the second direction ZE.
The motor 10 and the motor control device 40 can be arranged apart from each other. When the motor 10 and the motor control device 40 are separated from each other, the motor 10 and the speed reduction unit 30 are fixed to each other, and the motor control device 40 is also arranged away from the speed reduction unit 30.

The entire power connector 81 can be accommodated in the accommodating portion 42 </ b> A of the second housing 42.
-The deceleration part 30 of the motor unit 1 can be abbreviate | omitted.
The motor unit 1 can be applied to devices other than the electric power steering device.

Next, the technical idea that can be grasped from the above embodiment will be described below.
(Supplementary note 1) The motor connector is configured by combining a first holding member and a second holding member formed as individual components in the axial direction, and the control board includes the first holding member and the The motor control device according to claim 2, wherein the motor control device is sandwiched between second holding members.

  (Supplementary Note 2) A concave portion is formed in a portion of the fitting portion of the second housing that faces the protruding portion, and a space is formed between the inner surface of the concave portion and the protruding portion. 4. The motor control device according to 4.

  (Additional remark 3) The said motor drive part has two motor drive parts which drive the said motor, The said two motor drive parts have the power board formed separately, and one of the said motor drive parts The power board and the power board of the other motor driving unit are arranged in the surface direction of the mounting surface of the first housing, and the connector housing and the first housing are the power board of the one motor driving unit. The motor control device according to claim 1, wherein each of the power boards of the other motor drive unit is sandwiched.

  DESCRIPTION OF SYMBOLS 1 ... Motor unit, 10 ... Motor, 21 ... Busbar terminal, 40 ... Motor control apparatus, 41 ... 1st housing, 41B ... Mounting surface, 42 ... 2nd housing, 42A ... Storage part, 42B ... Fitting part, 50 DESCRIPTION OF SYMBOLS Motor drive part 51 ... Power board 52 ... Laminated power element (power element) 60 ... Motor control part 70 ... Control board 71 ... First plane part 71A ... Substrate body 71C ... Projection part 72 ... 2nd plane part, 72A ... Board body, 72B ... Projection part, 73 ... 3rd plane part, 73A ... Board body, 73C ... Projection part, 74 ... 1st bending part, 75 ... 2nd bending part, 81 ... Power supply connector , 90 ... Motor connector, 90A ... Connector housing, 96A ... Horizontally long insertion hole, 96B ... Longitudinal insertion hole, 98 ... Relay terminal, SA ... Storage space, ZE ... Second direction.

Claims (5)

A first housing having a mounting surface and formed of a metal material;
A second housing fixed to the first housing and forming a housing space with the first housing;
A power board disposed on the placement surface in the accommodation space, and a motor drive unit having a power element mounted on the power board;
A motor controller having a control board disposed on the placement surface in the housing space and taking a standing posture with respect to the power board;
The control board includes a first plane part, a second plane part, and a first bent part that connects the first plane part and the second plane part to each other.
The first planar portion and the second planar portion surround the power board. Motor control device. A motor connector;
The control board is parallel to the first plane part, and is arranged with a gap from the first plane part, and a third plane part that connects the third plane part and the second plane part to each other. Has two bends,
The motor connector is disposed in a space surrounded and formed by the first plane part, the second plane part, and the third plane part, and a connector housing in which a horizontally long insertion hole and a vertically long insertion hole are formed, And having a plurality of relay terminals held in the connector housing,
One of the plurality of relay terminals is disposed in the horizontally long insertion hole,
One of the plurality of relay terminals is disposed in the vertically long insertion hole,
The horizontally long insertion hole corresponds to the bus bar terminal and has a shape extending in the longitudinal direction of the connector housing,
The motor control device according to claim 1, wherein the vertically long insertion hole corresponds to the bus bar terminal and has a shape extending in a short direction of the connector housing. A power connector,
3. The motor control device according to claim 1, wherein at least a part of the power connector is disposed on the power board in the accommodation space and sandwiches the power board and the power element together with the first housing. The second housing has a fitting portion to be fitted to the motor, and a housing portion formed on the opposite side of the fitting portion from the motor side,
The accommodating portion has a larger diameter than the fitting portion,
The control board has a board body and a protruding part protruding from the board body,
The substrate body is housed in the housing portion,
The motor control device according to claim 1, wherein the protruding portion is accommodated in the fitting portion.   A motor unit provided with the motor control apparatus as described in any one of Claims 1-4.