Electric driving device, and electric power steering device

Abstract

To provide an electric driving device capable of suppressing length in an axial direction while facilitating connection of each system with a first circuit substrate and a second circuit substrate, and an electric power steering device.SOLUTION: An electric driving device comprises a motor, and an electronic control device for controlling rotation of the motor. The electronic control device has a second housing, a first circuit substrate, a second circuit substrate, and two inter-substrate connectors for connecting the first circuit substrate and the second circuit substrate. The first circuit substrate is partitioned into a first power system area and a second power system area by a power system partition line. The second circuit substrate is partitioned into a first control system area and a second control system area by a control system partition line. As viewed in an axial direction, the first power system area overlaps with both the first control system area and the second control system area. The second power system area overlaps with both the first control system area and the second control system area.SELECTED DRAWING: Figure 29

Description

Technical Field

[0001] The present disclosure relates to an electric drive device and an electric power steering device including an electronic control device that controls the rotation of a motor.

Background Art

[0002] An electric power steering device that generates an assist steering torque by a motor includes an electronic control device that is a device for controlling the motor. For example, Patent Document 1 describes a drive device in which a motor and a control unit that controls the motor are integrated.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The electric drive device of Patent Document 1 has a structure in which a first power module and a second power module are sandwiched between a control board and a power board. Since the first power module and the second power module have a large axial length in which the shaft extends, the axial size of the electric drive device becomes large.

[0005] The present disclosure has been made in view of the above problems, and an object thereof is to provide an electric drive device and an electric power steering device that can suppress the axial length while facilitating the connection for each system between a first circuit board and a second circuit board.

Means for Solving the Problems

[0006] To achieve the above object, an electric drive device according to one aspect includes a shaft extending axially from the load side to the counter-load side, a motor rotor interlocked with the shaft, a stator core for rotating the motor rotor, a plurality of coil groups divided into two systems of at least a first coil group and a second coil group for each of the three phases and exciting the stator core with three-phase alternating current, a motor stator including the plurality of coil groups, a motor including the motor rotor, the motor stator, and a first housing for accommodating the plurality of coil groups therein, a magnet provided at an end of the shaft on the counter-load side for driving and controlling the motor, and an electronic control device for controlling the rotation of the motor. The electronic control device includes a second housing, a transistor for outputting a current for exciting the first coil group and the second coil group, and a detection circuit disposed on the axial extension line of the shaft. A first circuit board is disposed on the load side of the second housing, a second circuit board disposed on the counter-load side of the second housing and having a control circuit for controlling a power circuit having the transistor, two inter-board connectors for connecting the first circuit board and the second circuit board, and a lid for accommodating the second circuit board between the second circuit board and the second housing and covering the second housing. The first circuit board is partitioned by a power system dividing line into a first power system region where wiring for outputting a current for exciting the first coil group is disposed and a second power system region where wiring for outputting a current for exciting the second coil group is disposed. The second circuit board is partitioned by a control system dividing line into a first control system region where wiring for constituting a control circuit for controlling a current for exciting the first coil group is disposed and a second control system region where wiring for constituting a control circuit for controlling a current for exciting the second coil group is disposed. In the axial direction, the first power system region overlaps both the first control system region and the second control system region, and in the axial direction, the second power system region overlaps both the first control system region and the second control system region.

[0007] As a result, among the connectors between the two substrates, one connector between the substrates can connect the first control system region and the first power system region, and the other connector between the substrates can connect the second control system region and the second power system region. As a result, large axial intervening components such as the first power module and the second power module are replaced by the connectors between the substrates, reducing the axial size.

[0008] As a desirable aspect, a first connector attached to the lid body for inputting and outputting a first signal from the outside, a second connector attached to the lid body for inputting and outputting a second signal from the outside, and a plurality of connection terminals of the first connector are connected to a first through hole near a first edge of the second circuit board so as to be distributed for each system with the control system division line interposed therebetween, and a plurality of connection terminals for each system of the second connector are connected to a second through hole near a second edge of the second circuit board so as to be distributed for each system with the control system division line interposed therebetween, and the first edge and the second edge are located at positions sandwiching a reference point on the extension line in the axial direction of the shaft. As a result, it is not necessary to prepare a plurality of connectors for each system, and the number of connectors attached to the lid body is reduced.

[0009] Desirably, a power wiring module further includes: two sets of third connectors each having a first power connector terminal and a second power connector terminal, which are attached to the lid body and to which power is input from the outside; a first lead frame having a first power input portion connected to the output piece of the first power connector terminal; and a second lead frame having a second power input portion connected to the output piece of the second power connector terminal, and the power wiring module is molded with resin. The first lead frame has a first power terminal of the first system and a second power terminal of the first system, and the second lead frame has a first power terminal of the second system and a second power terminal of the second system. The second circuit board has a plurality of notches. The first power terminal of the first system and the first power terminal of the second system pass through the notches. The first power terminal of the first system is connected to the third through hole in the first power system area, and the first power terminal of the second system is connected to the fourth through hole in the second power system area. The second power terminal of the first system is connected to the fifth through hole in the first control system area at a position adjacent to the first edge, and the second power terminal of the second system is connected to the sixth through hole in the second control system area at a position adjacent to the second edge. Thereby, the power input from the outside is branched by the power wiring module into the power supplied to the first circuit board and the power supplied to the second circuit board.

[0010] As a desirable aspect, the first circuit board has a first bus bar region to which a first bus bar of the first coil group is connected and a second bus bar region to which a second bus bar of the second coil group is connected. In the axial direction, the first bus bar region is disposed on an extension line of the control system division line and outside the second edge, and the second bus bar region is disposed on an extension line of the control system division line and outside the first edge. Thereby, by setting the first bus bar region and the second bus bar region on the extension line of the control system division line, signals output from the first power system region and the second power system region to the motor and signals input to the first control system region and the second control system region are arranged in the vicinity of the first edge and the second edge. Thereby, in the axial direction, a layout arrangement in which the first power system region overlaps both the first control system region and the second control system region and the second power system region overlaps both the first control system region and the second control system region becomes easy.

[0011] As a desirable aspect, the detection circuit has two rotation angle sensors, the reference point overlaps the detection circuit, the detection circuit is disposed across the power system division line, a first terminal group exposed from one side of the detection circuit is connected to the first power system region, and a second terminal group exposed from the other side of the detection circuit is connected to the second power system region. Thereby, wiring for each system from the two rotation angle sensors can be drawn out separately to the first power system region and the second power system region.

[0012] As a desirable aspect, a part of the power system division line straddled by the detection circuit is parallel to the control system division line. Thereby, the arrangement of the terminal groups of the detection circuit can be arranged parallel or orthogonal to the terminal groups of the integrated circuits mounted on the first circuit board and the second circuit board, and the wiring design becomes easy.

[0013] Desirably, the control circuit that controls the current for exciting the first coil group includes a first control arithmetic circuit and a first power management circuit, and the control circuit that controls the current for exciting the second coil group includes a second control arithmetic circuit and a second power management circuit. When a virtual circle is drawn connecting the area center of the first control arithmetic circuit and the area center of the second control arithmetic circuit around the extension line in the axial direction of the shaft, the first power management circuit and the second power management circuit are arranged at positions where they overlap on the virtual circle. When a virtual straight line orthogonal to the control system division line is drawn around the extension line in the axial direction of the shaft, the first control arithmetic circuit and the first power management circuit are divided by the virtual straight line in the first control system area, and the second control arithmetic circuit and the second power management circuit are divided by the virtual straight line in the second control system area. Thereby, the heat generation generated by the two control arithmetic circuits and the two power management circuits is dispersed, and the reliability of the operation of the two control arithmetic circuits is enhanced.

[0014] Desirably, on the second circuit board, the direction in which the through hole near the first edge of the second circuit board to which power is supplied, the first power management circuit, and the first control arithmetic circuit are arranged in this order, and the direction in which the through hole near the second edge of the second circuit board to which power is supplied, the second power management circuit, and the second control arithmetic circuit are arranged in this order are opposite to each other. Thereby, the component layout of the second circuit board becomes efficient, and the size of the second circuit board is suppressed.

[0015] Desirably, the electric power steering apparatus includes the above-described electric drive apparatus, and the electric drive apparatus generates an assist steering torque. As described above, the electric drive apparatus can improve reliability. As a result, the reliability of the electric power steering apparatus with enhanced vibration resistance is also improved.

Advantages of the Invention

[0016] According to the present disclosure, it is possible to provide an electric drive apparatus and an electric power steering apparatus that can facilitate the connection for each system between the first circuit board and the second circuit board and suppress the axial length.

Brief Description of the Drawings

[0017]

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Mode for Carrying Out the Invention

[0018] The mode (embodiment) for carrying out the present disclosure will be described in detail with reference to the drawings. The present disclosure is not limited by the content described in the following embodiments. Further, the constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the constituent elements described below can be combined as appropriate.

[0019] (Embodiment 1) Figure 1 is a perspective view schematically showing a vehicle equipped with an electric power steering apparatus according to Embodiment 1. Figure 2 is a schematic diagram of the electric power steering apparatus according to Embodiment 1. As shown in Figure 1, the vehicle 101 is equipped with an electric power steering apparatus 100. The outline of the electric power steering apparatus 100 will be described with reference to Figure 2.

[0020] The electric power steering apparatus 100 includes, in the order in which the force given by the driver (operator) is transmitted, a steering wheel 191, a steering shaft 192, a universal joint 196, an intermediate shaft 197, a universal joint 198, a first rack and pinion mechanism 199, and a tie rod 172. Further, the electric power steering apparatus 100 includes a torque sensor 194 that detects the steering torque of the steering shaft 192, a motor 30, an electronic control unit (hereinafter referred to as ECU (Electronic Control Unit)) 10 that controls the motor 30, and a power transmission mechanism 173. A vehicle speed sensor 182, a power supply device 183 (for example, an in-vehicle battery), and an ignition switch 184 are provided on the vehicle body. The vehicle speed sensor 182 detects the traveling speed of the vehicle 101. The vehicle speed sensor 182 outputs the detected vehicle speed signal SV to the ECU 10 by CAN (Controller Area Network) communication. Power is supplied to the ECU 10 from the power supply device 183 when the ignition switch 184 is in the on state.

[0021] The electric drive device 1 includes a motor 30 and an ECU 10 fixed to the anti-load side of the shaft 31 of the motor 30. Further, the electric drive device 1 may include an adapter that connects the ECU 10 and the motor 30.

[0022] As shown in FIG. 2, the steering shaft 192 includes an input shaft 192A, an output shaft 192B, and a torsion bar 192C. One end of the input shaft 192A is connected to the steering wheel 191, and the other end is connected to the torsion bar 192C. One end of the output shaft 192B is connected to the torsion bar 192C, and the other end is connected to the universal joint 196. Note that the torque sensor 194 detects the steering torque applied to the steering shaft 192 by detecting the twist of the torsion bar 192C. The torque sensor 194 outputs a steering torque signal T corresponding to the detected steering torque to the ECU 10. The steering shaft 192 rotates by the steering force applied to the steering wheel 191.

[0023] The intermediate shaft 197 has an upper shaft 197A and a lower shaft 197B, and transmits the torque of the output shaft 192B. The upper shaft 197A is connected to the output shaft 192B via a universal joint 196. On the other hand, the lower shaft 197B is connected to the first pinion shaft 199A of the first rack and pinion mechanism 199 via a universal joint 198. The upper shaft 197A and the lower shaft 197B are, for example, spline-coupled.

[0024] The first rack and pinion mechanism 199 has a first pinion shaft 199A, a first pinion gear 199B, a rack shaft 199C, and a first rack 199D. One end of the first pinion shaft 199A is connected to the lower shaft 197B via a universal joint 198, and the other end is connected to the first pinion gear 199B. The first rack 199D formed on the rack shaft 199C meshes with the first pinion gear 199B. The rotational movement of the steering shaft 192 is transmitted to the first rack and pinion mechanism 199 via the intermediate shaft 197. This rotational movement is converted into a linear movement of the rack shaft 199C by the first rack and pinion mechanism 199. The tie rods 172 are respectively connected to both ends of the rack shaft 199C.

[0025] The motor 30 is a motor that generates an auxiliary steering torque for assisting the driver's steering. The motor 30 may be a brushless motor or a brushed motor having a brush and a commutator.

[0026] The ECU 10 is provided with a rotation angle sensor 23a. The rotation angle sensor 23a detects the rotation phase of the motor 30. The ECU 10 acquires the rotation phase signal of the motor 30 from the rotation angle sensor 23a, acquires the steering torque signal T from the torque sensor 194, and acquires the vehicle speed signal SV of the vehicle 101 from the vehicle speed sensor 182. The ECU 10 calculates an auxiliary steering command value of the assist command based on the rotation phase signal, the steering torque signal T, and the vehicle speed signal SV. The ECU 10 supplies current to the motor 30 based on the calculated auxiliary steering command value.

[0027] The electric power steering apparatus 100 is of the rack parallel type. The shaft 31 of the motor 30 is connected to the power transmission mechanism 173. The power transmission mechanism 173 has a pulley 176 and a belt 177. The rotation of the belt 177 rotates the nut of the ball screw device 178. Thereby, an assist force is applied to the rack shaft 199C based on the rotation of the shaft 31 of the motor 30.

[0028] The steering force of the driver input to the steering wheel 191 is transmitted to the first rack and pinion mechanism 199 via the steering shaft 192 and the intermediate shaft 197. The first rack and pinion mechanism 199 transmits the transmitted steering force to the rack shaft 199C as a force applied in the axial direction of the rack shaft 199C. At this time, the ECU 10 acquires the steering torque signal T input to the steering shaft 192 from the torque sensor 194. The ECU 10 acquires the vehicle speed signal SV from the vehicle speed sensor 182. The ECU 10 acquires the rotation phase signal of the motor 30 from the rotation angle sensor 23a. Then, the ECU 10 outputs a control signal to control the operation of the motor 30. The belt 177 rotates according to the auxiliary steering torque created by the motor 30, and the nut of the ball screw device 178 rotates. Thereby, an assist force is applied to the rack shaft 199C based on the rotation of the shaft 31 of the motor 30. In this way, the steering of the driver's steering wheel 191 is assisted by the electric power steering apparatus 100.

[0029] As shown in FIG. 2, the electric power steering apparatus 100 is of the rack parallel type, but is not limited thereto. The electric power steering apparatus 100 may be of a single pinion assist type in which assist force is applied only to the first pinion gear 199B. The electric power steering apparatus 100 may be of a dual pinion type in which assist force is applied to the second rack and pinion mechanism 170. Without being limited thereto, the electric power steering apparatus 100 may be of a column assist type in which assist force is applied to the steering shaft 192, for example.

[0030] FIG. 3 is an exploded perspective view showing the electric drive device according to Embodiment 1. As shown in FIG. 3, the electric drive device 1 includes a motor 30 and an ECU 10 disposed on the anti-load side of the motor 30. A gear 30G is provided at the load side end of the shaft 31 of the motor 30, and the gear 30G is inserted into the speed reduction device 175 described above. In the present embodiment, the axial direction AX refers to a direction parallel to the extending direction of the shaft 31 (see FIG. 4) of the motor 30.

[0031] The motor 30 includes a first housing 930. The first housing 930 is cylindrical. The first housing 930 is also called a motor housing. The first housing 930 has a tool insertion hole 36H, and includes a side cover 36 that closes the tool insertion hole 36H and is detachable from the first housing 930. When the side cover 36 is removed from the first housing 930, the terminal block 80 is exposed from the tool insertion hole 36H.

[0032] The motor stator 931 includes a first motor coil wiring 321 connected to the first coil group Gr1 and a second motor coil wiring 322 connected to the second coil group Gr2. Here, one terminal block 80 electrically connects the first motor coil wiring 321 and the first circuit board 60, and the other terminal block 80 electrically connects the second motor coil wiring 322 and the first circuit board 60.

[0033] In addition, a waterproof breathing filter 10B is provided in the second housing 11 which is the housing of the ECU 10. The waterproof breathing filter 10B is breathable but waterproof and can prevent the intrusion of moisture. For example, when the pressure difference between the inside and outside of the ECU 10 increases due to a temperature change, air moves through the waterproof breathing filter 10B to reduce the pressure difference.

[0034] FIG. 4 is a cross-sectional view schematically showing a cross-section of the motor according to Embodiment 1. FIG. 5 is a schematic diagram showing the wiring of the motor according to Embodiment 1. In the present embodiment, the circumferential direction is the direction along the concentric circles centered on the shaft 31. The radial direction is the direction away from the shaft 31 in a plane perpendicular to the axial direction AX. As shown in FIG. 4, the motor 30 includes a first housing 930, a motor stator 931, and a motor rotor 932. The motor stator 931, which is cylindrical, includes a plurality of first motor coils 37 and a plurality of second motor coils 38. The motor stator 931 includes an annular back yoke 931a and a plurality of teeth 931b protruding from the inner peripheral surface of the back yoke 931a. Twelve teeth 931b are arranged in the circumferential direction. The motor rotor 932 includes a rotor yoke 932a and a magnet 932b. The magnet 932b is provided on the outer peripheral surface of the rotor yoke 932a. The number of magnets 932b is, for example, eight. The rotation of the motor rotor 932 is interlocked with the rotation of the shaft 31.

[0035] As shown in FIG. 4, the first motor coil 37 is concentrically wound around each of the plurality of teeth 931b. The first motor coil 37 is concentrically wound around the outer periphery of the tooth 931b via an insulator. All the first motor coils 37 are included in the first coil system. The first coil system according to Embodiment 1 is supplied with current and excited by an inverter circuit 251 (see FIG. 6) included in the first power circuit 25A. The first coil system includes, for example, six first motor coils 37. The six first motor coils 37 are arranged such that two first motor coils 37 are adjacent to each other in the circumferential direction. Three first coil groups Gr1, each having an adjacent first motor coil 37 as one group, are arranged at equal intervals in the circumferential direction. That is, the first coil system includes three first coil groups Gr1 arranged at equal intervals in the circumferential direction. Note that the number of the first coil groups Gr1 is not necessarily three, and may be 3n arranged at equal intervals in the circumferential direction, where n is a natural number. Further, it is desirable that n be an odd number. As described above, in the present embodiment, there are a plurality of coil groups, which are divided into at least two systems, i.e., the first coil group Gr1 and the second coil group Gr2 for each three-phase, and the stator core is excited by three-phase alternating current.

[0036] As shown in FIG. 4, the second motor coil 38 is concentrically wound around each of a plurality of teeth 931b. The second motor coil 38 is concentrically wound around the outer periphery of the teeth 931b via an insulator. The teeth 931b around which the second motor coil 38 is concentrically wound are different from the teeth 931b around which the first motor coil 37 is concentrically wound. All the second motor coils 38 are included in the second coil system. The second coil system is supplied with current and excited by an inverter circuit 251 (see FIG. 6) included in the second power circuit 25B. The second coil system includes, for example, six second motor coils 38. The six second motor coils 38 are arranged such that two second motor coils 38 are adjacent to each other in the circumferential direction. Three second coil groups Gr2, each having an adjacent pair of second motor coils 38 as one group, are arranged at equal intervals in the circumferential direction. That is, the second coil system includes three second coil groups Gr2 arranged at equal intervals in the circumferential direction. Note that the number of second coil groups Gr2 does not necessarily have to be three, and it may be arranged in 3n equal intervals in the circumferential direction, where n is a natural number. Also, it is desirable that n be an odd number.

[0037] As shown in FIG. 5, the six first motor coils 37 include two first U-phase motor coils 37Ua and 37Ub excited by the first U-phase current I1u, two first V-phase motor coils 37Va and 37Vb excited by the first V-phase current I1v, and two first W-phase motor coils 37Wa and 37Wb excited by the first W-phase current I1w. The first U-phase motor coil 37Ub is connected in series to the first U-phase motor coil 37Ua. The first V-phase motor coil 37Vb is connected in series to the first V-phase motor coil 37Va. The first W-phase motor coil 37Wb is connected in series to the first W-phase motor coil 37Wa. The winding directions of the first motor coils 37 around the teeth 931b are all the same. Also, the first U-phase motor coil 37Ub, the first V-phase motor coil 37Vb, and the first W-phase motor coil 37Wb are joined in a star connection (Y connection).

[0038] As shown in FIG. 5, the six second motor coils 38 include two second U-phase motor coils 38Ua and 38Ub excited by a second U-phase current I2u, two second V-phase motor coils 38Va and 38Vb excited by a second V-phase current I2v, and two second W-phase motor coils 38Wa and 38Wb excited by a second W-phase current I2w. The second U-phase motor coil 38Ub is connected in series with the second U-phase motor coil 38Ua. The second V-phase motor coil 38Vb is connected in series with the second V-phase motor coil 38Va. The second W-phase motor coil 38Wb is connected in series with the second W-phase motor coil 38Wa. The winding directions of the teeth 931b of the second motor coil 38 are all in the same direction, which is the same as the winding direction of the first motor coil 37. Also, the second U-phase motor coil 38Ub, the second V-phase motor coil 38Vb, and the second W-phase motor coil 38Wb are joined in a star connection (Y connection).

[0039] As shown in FIG. 4, the three first coil groups Gr1 are composed of a first UV coil group Gr1UV, a first VW coil group Gr1VW, and a first UW coil group Gr1UW. The first UV coil group Gr1UV includes the first U-phase motor coil 37Ub and the first V-phase motor coil 37Va that are adjacent to each other in the circumferential direction. The first VW coil group Gr1VW includes the first V-phase motor coil 37Vb and the first W-phase motor coil 37Wa that are adjacent to each other in the circumferential direction. The first UW coil group Gr1UW includes the first U-phase motor coil 37Ua and the first W-phase motor coil 37Wb that are adjacent to each other in the circumferential direction.

[0040] As shown in Fig. 4, the three second coil groups Gr2 are composed of a second UV coil group Gr2UV, a second VW coil group Gr2VW, and a second UW coil group Gr2UW. The second UV coil group Gr2UV includes second U-phase motor coils 38Ub and second V-phase motor coils 38Va that are adjacent to each other in the circumferential direction. The second VW coil group Gr2VW includes second V-phase motor coils 38Vb and second W-phase motor coils 38Wa that are adjacent to each other in the circumferential direction. The second UW coil group Gr2UW includes second U-phase motor coils 38Ua and second W-phase motor coils 38Wb that are adjacent to each other in the circumferential direction.

[0041] The first motor coil 37 excited by the first U-phase current I1u faces the second motor coil 38 excited by the second U-phase current I2u in the radial direction of the motor stator 931. In the following description, the radial direction of the motor stator 931 is simply referred to as the radial direction. For example, as shown in Fig. 4, in the radial direction, the first U-phase motor coil 37Ua faces the second U-phase motor coil 38Ua, and the first U-phase motor coil 37Ub faces the second U-phase motor coil 38Ub.

[0042] The first motor coil 37 excited by the first V-phase current I1v faces the second motor coil 38 excited by the second V-phase current I2v in the radial direction. For example, as shown in Fig. 4, in the radial direction, the first V-phase motor coil 37Va faces the second V-phase motor coil 38Va, and the first V-phase motor coil 37Vb faces the second V-phase motor coil 38Vb.

[0043] The first motor coil 37 excited by the first W-phase current I1w faces the second motor coil 38 excited by the second W-phase current I2w in the radial direction. For example, as shown in Fig. 4, in the radial direction, the first W-phase motor coil 37Wa faces the second W-phase motor coil 38Wa, and the first W-phase motor coil 37Wb faces the second W-phase motor coil 38Wb.

[0044] FIG. 6 is an explanatory diagram showing the relationship between the motor and the ECU according to Embodiment 1. As shown in FIG. 6, the ECU 10 includes a first circuit board 60 (see FIG. 7), a second circuit board 20 (see FIG. 7), a power wiring module 90 (see FIG. 11), and a connector CNT (see FIG. 3). The first circuit board 60 is mounted with a detection circuit 23, a first power circuit 25A, a second power circuit 25B, a first motor drive circuit 26A, a second motor drive circuit 26B, a cutoff drive circuit 243, a power relay drive circuit 246, a backflow prevention circuit 257, and a capacitor 253. The second circuit board 20 is mounted with a control arithmetic circuit 24IC and a power management circuit 24PM. The power wiring module 90 electrically connects the connector CNT and the first circuit board 60 via a first power terminal 93, and electrically connects the connector CNT and the second circuit board 20 via a second power terminal 96. Further, input / output signals such as a steering torque signal T and a vehicle speed signal SV are transmitted to the control arithmetic circuit 24IC of the second circuit board 20 via the connector CNT. In FIG. 6, circuits that are not necessary for the explanation are appropriately omitted.

[0045] The first circuit board 60 is a multilayer resin board provided with a plurality of conductive layers. The detection circuit 23 includes two rotation angle sensors 23a and a sensor control unit 23b. The first motor drive circuit 26A and the second motor drive circuit 26B each include a gate drive circuit 242, a plurality of current detection circuits 244, and a boost circuit 245. The first power circuit 25A includes an inverter circuit 251 and a current cutoff circuit 255. The second power circuit 25B includes an inverter circuit 251 and a current cutoff circuit 255. The boost circuit 245 supplies the boosted power to the gate drive circuit 242, the cutoff drive circuit 243, and the power relay drive circuit 246.

[0046] In addition, the inverter circuit 251 has a plurality of drive elements 252. The drive element 252 is a field effect transistor (FET), also referred to as a switching element. The drive element 252 connected to the high potential side constitutes the upper arm, and the drive element 252 connected to the low potential side constitutes the lower arm. The shunt resistor SR is connected to each of the three drive elements 252 of the lower arm. Note that although one shunt resistor SR is connected to each of the three drive elements 252, it is also possible to connect only one shunt resistor SR to the three drive elements 252.

[0047] The control arithmetic circuit 24IC sends out control signals for each system and controls the first motor drive circuit 26A or the second motor drive circuit 26B. For example, the control arithmetic circuit 24IC calculates a motor current command value and controls the first motor drive circuit 26A or the second motor drive circuit 26B with a command signal including the calculated motor current command value. The sensor control unit 23b calculates the motor electrical angle θm and outputs it to the control arithmetic circuit 24IC. The gate drive circuit 242 receives the command signal output from the control arithmetic circuit 24IC. The gate drive circuit 242 controls the first power circuit 25A and the second power circuit 25B based on the command signal. The gate drive circuit 242 includes a capacitor 256, which will be described later, in the power supply line. Note that, among the two control arithmetic circuits 24IC, the one that controls the first motor drive circuit 26A may be described as the first control arithmetic circuit, and the one that controls the second motor drive circuit 26B may be described as the second control arithmetic circuit.

[0048] As shown in FIG. 6, the ECU 10 includes two rotation angle sensors 23a. The detection circuit 23 can continue to function even if one of the rotation angle sensors 23a fails. The rotation angle sensor 23a is, for example, a magnetic sensor. The detection value of the rotation angle sensor 23a is supplied to the sensor control unit 23b. The sensor control unit 23b calculates the motor electrical angle θm based on the detection value of the rotation angle sensor 23a and outputs it to the control arithmetic circuit 24IC.

[0049] The control arithmetic circuit 24IC receives the steering torque signal T detected by the torque sensor 194, the vehicle speed signal SV detected by the vehicle speed sensor 182, and the motor electrical angle θm output from the sensor control unit 23b. The control arithmetic circuit 24IC calculates a motor current command value based on the steering torque signal T, the vehicle speed signal SV, and the motor electrical angle θm, and outputs a command signal to the gate drive circuit 242.

[0050] The gate drive circuit 242 (the first gate drive circuit) calculates a first pulse width modulation signal based on the motor current command value, and outputs a gate drive signal to the inverter circuit 251 of the first power circuit 25A. The gate drive signal is a pulse signal generated based on the gate voltage boosted by the boost circuit 245. The inverter circuit 251 switches the drive element 252 according to the duty ratio of the first pulse width modulation signal to generate a three-phase alternating current including a first U-phase current I1u, a first V-phase current I1v, and a first W-phase current I1w. The first U-phase current I1u excites the first U-phase motor coils 37Ua and 37Ub, the first V-phase current I1v excites the first V-phase motor coils 37Va and 37Vb, and the first W-phase current I1w excites the first W-phase motor coils 37Wa and 37Wb.

[0051] The gate drive circuit 242 (the second gate drive circuit) calculates a second pulse width modulation signal based on the motor current command value, and outputs a gate drive signal to the inverter circuit 251 of the second power circuit 25B. The gate drive signal is generated based on the voltage boosted by the boost circuit 245. The inverter circuit 251 switches the drive element 252 according to the duty ratio of the second pulse width modulation signal to generate a three-phase alternating current including a second U-phase current I2u, a second V-phase current I2v, and a second W-phase current I2w. The second U-phase current I2u excites the second U-phase motor coils 38Ua and 38Ub, the second V-phase current I2v excites the second V-phase motor coils 38Va and 38Vb, and the second W-phase current I2w excites the second W-phase motor coils 38Wa and 38Wb.

[0052] The inverter circuit 251 is a power conversion circuit that converts DC power into AC power. As described above, the inverter circuit 251 has a plurality of drive elements 252. The drive element 252 is, for example, a field effect transistor. A smoothing capacitor 253 is connected in parallel to the inverter circuit 251. The capacitor 253 is, for example, an electrolytic capacitor. In other words, the second circuit board 20 includes a plurality of electrolytic capacitors connected in parallel.

[0053] Also, the current detection circuit 244 is connected to, for example, a shunt resistor SR. The shunt resistor SR is an example of a current detection element. The current detection element may be a Hall element or the like. The current detection circuit 244 includes a differential amplifier circuit and a low-pass filter using an operational amplifier. The differential amplifier circuit of the current detection circuit 244 amplifies the detected value detected by the shunt resistor SR, attenuates components higher than the cut-off frequency of the detected value after signal amplification through the low-pass filter, and sends the detected value detected by the shunt resistor SR to the control arithmetic circuit 24IC as a current value.

[0054] The current cut-off circuit 255 is arranged between the inverter circuit 251 and the first motor coil 37 or the second motor coil 38. When it is determined that the current value detected by the current detection circuit 254 is abnormal, the control arithmetic circuit 24IC drives the current cut-off circuit 255 via the cut-off drive circuit 243, and can cut off the current flowing from the inverter circuit 251 to the first motor coil 37. Also, the control arithmetic circuit 24IC drives the current cut-off circuit 255 via the cut-off drive circuit 243, and can cut off the current flowing from the inverter circuit 251 to the second motor coil 38. The reverse current prevention circuit 257 includes an FET. Note that the reverse current prevention circuit 257 may connect two FETs in reverse. When it is determined that the current value detected by the current detection circuit 254 is abnormal, the control arithmetic circuit 24IC turns off the reverse current prevention circuit 257 via the power relay drive circuit 246 to protect the inverter circuit 251. Thus, the current flowing through the first motor coil 37 and the current flowing through the second motor coil 38 are independently controlled by the control arithmetic circuit 24IC, respectively.

[0055] FIG. 7 is an exploded perspective view showing the electric drive device according to Embodiment 1. As shown in FIG. 7, the power wiring module 90 is fastened and fixed to the lid body 40 by a fixing member B9 such as a bolt. As shown in FIG. 7, the second circuit board 20 is fastened and fixed to the lid body 40 by a fixing member B7 such as a bolt. As shown in FIG. 7, the heat sink 29 is fastened and fixed to the lid body 40 by a fixing member B8 such as a bolt. Thereby, the power wiring module 90, the heat sink 29, and the second circuit board 20 are combined via the lid body 40 to form an upper assembly.

[0056] As shown in FIG. 7, the heat sink 29 is sandwiched between the power wiring module 90 and the second circuit board 20. The heat sink 29 is made of a metal such as aluminum or copper with high heat dissipation, and can dissipate the heat of the second circuit board 20.

[0057] As shown in FIG. 3, a magnet 32 is attached to the end of the shaft 31 on the anti-load side via a magnet holder 32A. Half of the magnet 32 is magnetized to the S pole and half to the N pole. Alternatively, the magnet 32 may have S poles and N poles alternately arranged in the circumferential direction on its outer peripheral surface.

[0058] As described above, the ECU 10 includes a first circuit board 60 (see FIG. 7), a second circuit board 20 (see FIG. 7), a second housing 11 (see FIG. 3), a lid body 40 (see FIG. 3), a power wiring module 90 (see FIG. 11), and a connector CNT (see FIG. 3). The second housing 11 is made of a metal such as aluminum or copper with high heat dissipation. The second housing 11 acts as a heat sink for dissipating the heat generated by the first circuit board 60 and the second circuit board 20. The lid body 40 is made of a metal such as aluminum or copper with high heat dissipation and is joined to the second housing 11. Thereby, even if the heat generated by the first circuit board 60 and the second circuit board 20 is transmitted from the second housing 11, it is efficiently dissipated to the outside from the lid body 40.

[0059] As shown in Fig. 3, a flange 39 is provided at the end of the first housing 930 of the motor 30 on the non-load side. A female screw portion 39H is provided on the flange 39 in the axial direction AX. A flange 111 is provided at the end of the second housing 11 on the load side. A through hole 111H is provided in the flange 111 in the axial direction AX. A fixing member B1 such as a screw passes through the through hole 111H and is fastened to the female screw portion 39H to fix the first housing 930 and the second housing 11.

[0060] As shown in Fig. 3, a plurality of flanges 131 are provided at the end of the second housing 11 on the non-load side. A female screw portion is provided on the flange 131 in the axial direction AX. A plurality of flanges 441 are provided on the outer edge of the lid body 40. A through hole 441H (see Fig. 21) is provided in the flange 441 in the axial direction AX described later. A fixing member B6 such as a screw passes through the through hole 441H and is fastened to the female screw portion to fix the lid body 40 and the second housing 11.

[0061] The second circuit board 20 has a plurality of electronic components mounted on both sides of the board body. The board body of the second circuit board 20 is, for example, a printed circuit board formed of resin or the like. The plurality of electronic components mounted on one board body include, for example, a central processing unit (CPU), an application specific integrated circuit (ASIC), a power management integrated circuit, a capacitor, a resistance element, a diode, a thermistor, a receptacle 61, and the like. The control circuit 24 shown in Fig. 6 is constituted by these plurality of electronic components.

[0062] The second circuit board 20 is housed in a housing space 11R (see Fig. 7) provided in the second housing 11. Thereby, the size of the electric drive device 1 in the axial direction AX is reduced.

[0063] The second housing 11 and the support 70 are connected by a fixing member B2 such as a screw. As a result, even when the terminal block 80 is pressed by a fixing member BM such as a screw, the stress associated with the pressing is transmitted to the support 70, the fixing member B2, and the second housing 11. Consequently, the stress applied to the first circuit board 60 is further reduced.

[0064] The second housing 11 has a bottom portion 115 and a side wall portion 116 surrounding the bottom portion 115. There is an accommodation space 11R inside the side wall portion 116.

[0065] As shown in FIG. 7, the second housing 11 sandwiches the first circuit board 60 between itself and the support 70. The support 70 is made of a metal such as highly heat - dissipative aluminum or copper and is a heat sink with excellent heat dissipation. There are two terminal blocks 80, and one terminal block 80 and the other terminal block 80 are arranged at positions sandwiching the support 70. Two terminal blocks 80 are attached to the side surface of the support 70. Thus, even if the motor coil wiring is made redundant, by utilizing a plurality of side surfaces of the support 70, the radial size of the motor 30 is suppressed.

[0066] As shown in FIG. 7, a through - hole 119 and a through - hole 118 penetrate the bottom portion 115 of the second housing 11 in the axial direction AX. A part of the power wiring module 90 is inserted into the through - hole 118, and the first power terminal 93 reaches the first circuit board 60. In the present embodiment, a receptacle 61 is provided on the first circuit board 60, and a plug (not shown) corresponding to the receptacle 61 is provided on the second circuit board 20. The plug and the receptacle 61 are inserted into the through - hole 119 to form an inter - board connector 63. This inter - board connector 63 transmits signals between the first circuit board 60 and the second circuit board 20. The inter - board connector 63 allows displacement of the position of the plug with respect to the receptacle 61. Also, the inter - board connector 63 is called a floating connector, has a movable part, and can absorb misalignment during fitting.

[0067] The second circuit board 20 is disposed on the non-load side of the second housing 11. The first circuit board 60 and the second circuit board 20 are electrically connected by an inter-board connector 63 inserted into a through-hole 119 in the axial direction AX opened in the second housing 11. Thereby, both axial surfaces of the second housing 11 are used as heat dissipation surfaces, and the second housing acts as a heat sink.

[0068] As shown in FIG. 7, on the second surface 60B of the first circuit board 60, a field effect transistor TR and a shunt resistor SR, which are heat-generating electronic components, are arranged. The field effect transistor TR is provided not only on the drive element 252 shown in FIG. 6, but also on the current cutoff circuit 255, the cutoff drive circuit 243, and the wiring for supplying the power supply voltage Vdc. As shown in FIG. 6, the shunt resistor SR is connected to the current detection circuit 254.

[0069] The field effect transistor TR and the shunt resistor SR are in contact with the heat dissipation surface of the second housing 11 via a heat dissipation material called TIM (Thermal Interface Material). The heat dissipation material is, for example, a material in which a thermally conductive filler is mixed with a silicone polymer, and any material other than the above material may be used as long as it has a higher thermal conductivity than the substrate body of the first circuit board 60.

[0070] FIG. 8 is a perspective view showing a power board according to Embodiment 1. FIG. 9 is a perspective view showing a configuration example in which a terminal block according to Embodiment 1 is attached to the power board. FIG. 10 is a perspective view showing the terminal block according to Embodiment 1.

[0071] As shown in FIG. 8, the terminal block 80 has a base 81, a mounting bracket 82, and a conductive terminal 83. The base 81 is formed of an insulating material to ensure insulation between the terminals. One end of the conductive terminal 83 is inserted into the first circuit board 60 and electrically connected to the first circuit board 60.

[0072] The other end of the conductive terminal 83 is electrically connected to the mounting bracket 82. The mounting bracket 82 is provided with a through hole 82H through which a fixing member BM such as a screw shown in FIG. 7 passes. The first motor coil wiring 321 or the second motor coil wiring 322 of the motor 30 has a through hole. The first motor coil wiring 321 or the second motor coil wiring 322 is inserted into the insertion hole 81H of the base 81, the fixing member BM passes through, and is fastened to a nut (not shown) on the back surface of the first motor coil wiring 321 or the second motor coil wiring 322. Thereby, one terminal block 80 electrically connects the first circuit board 60 and the first motor coil wiring 321 of the motor 30, and the other terminal block 80 electrically connects the first circuit board 60 and the second motor coil wiring 322 of the motor 30. Note that the mounting bracket 82 may be closely fixed to the conductive terminal 83, or the mounting bracket 82 may be integrated with the conductive terminal 83 to form one component.

[0073] As shown in FIG. 8, the support 70 has a first top plate 71 and a second top plate 79 having different heights. The first top plate 71 and the second top plate 79 are different in size according to the heights of the capacitors 253, 256 (see FIG. 9) between them and the first circuit board 60. A heat dissipation material is interposed between the capacitors 253, 256 and the first top plate 71 and the second top plate 79, and the heat of the capacitors 253, 256 is transmitted to the first top plate 71 and the second top plate 79, so that deterioration of the capacitors 253, 256 is suppressed. The capacitors 253, 256 are, for example, electrolytic capacitors.

[0074] The support body 70 has a first top plate 71 that covers the capacitor 253, and a magnet 32 is inserted into an axial through-hole 76 opened in the top plate at a position that does not overlap with the capacitor 253. Thereby, the cooling of the capacitor 253 is promoted by heat conduction to the first top plate 71. And the first side surface 74 of the support body 70 generated by the size in the axial direction AX of the capacitor 253 can be used as a contact surface 73 with the terminal block 80. Also, at a position that does not overlap with the capacitor 253, since the magnet 32 is inserted, the space outside the radial direction of the magnet 32 can also be used as an arrangement area for the capacitor 253. As a result, the size in the axial direction AX of the electric drive device 1 becomes smaller.

[0075] There is a step between the first top plate 71 and the second top plate 79. Thereby, the support body 70 becomes a heat sink with a minimum volume according to the sizes of the capacitors 253 and 256, contributing to the weight reduction of the electric drive device 1.

[0076] As shown in FIG. 10, legs 84 extend toward the support body 70 on both sides of the base 81 of the terminal block 80, and through-holes 85H are opened at the ends 85 of the legs 84. A fixing member B4 such as a screw is fastened through the through-hole 85H to a female screw portion 73H on the contact surface 73 of the first side surface 74.

[0077] The contact surface 73 of the first side surface 74 shown in FIG. 10 and the contact surface of the fixing member BM of the mounting bracket 82 shown in FIG. 8 are parallel. For this reason, even when the terminal block 80 is pressed by a fixing member BM such as a screw, the stress accompanying the pressing is received by the contact surface 73 of the first side surface 74 via the end 85 of the leg 84. As a result, deformation of the conductive terminal 83 and stress applied to the first circuit board 60 are suppressed.

[0078] As shown in FIG. 9, the support 70 is provided with four female screw portions 77 that open to the anti-load side. Among the plurality of female screw portions 77, some of the female screw portions 77 face the support 70 within the notch 60N of the first circuit board 60. Some of the other female screw portions 77 face the notch 60NN of the first circuit board 60 shown in FIG. 9. The fixing member B2 such as a screw shown in FIG. 7 passes through the notch 60N of the first circuit board 60 or the notch 60NN of the first circuit board 60 and is fastened to the second housing 11.

[0079] As shown in FIG. 9, the support 70 has a base portion 72 and a first top plate 71 that protrudes from the base portion 72 toward the load side. The support 70 also has two first side surfaces 74 and two second side surfaces 75. The first side surface 74 and the second side surface 75 are respectively connected between the base portion 72 and the first top plate 71. The support 70 has two second top plates 79 that extend in the second direction so as to be separated from the two second side surfaces 75 respectively.

[0080] A through hole 76 that penetrates in the axial direction AX is formed in the first top plate 71 of the support 70. A magnet 32 (see FIG. 3) at the anti-load side end of the shaft 31 is inserted into the through hole 76. As a result, the magnet 32 is disposed in the vicinity of the rotation angle sensor 23a mounted on the first circuit board 60.

[0081] As shown in FIG. 9, the support 70 is provided with four female screw portions 78 that open to the anti-load side. When a fixing member B3 such as a screw passes through the through hole of the first circuit board 60 and is fastened to the female screw portion 78, as shown in FIG. 8, the support 70 and the first circuit board 60 are fixed in a state of being in close contact with each other. It is desirable that the female screw portions 78 that open to the anti-load side and are located diagonally are point-symmetrical to each other. This makes it easier to assemble the support 70 and the first circuit board 60.

[0082] As shown in FIGS. 9 and 10, the first circuit board 60 has a plurality of electronic components mounted on both sides of the board body. The board body of the first circuit board 60 is, for example, a printed circuit board formed of resin or the like. The plurality of electronic components mounted on one board body include FETs, magnetic sensors, electrolytic capacitors, resistance elements, diodes, thermistors, application specific integrated circuits (ASICs), and the like. These plurality of electronic components constitute the detection circuit 23, the first power circuit 25A, and the second power circuit 25B shown in FIG. 6.

[0083] As shown in FIG. 9, capacitors 253 and 256 are mounted on the first surface 60A of the first circuit board 60. As shown in FIG. 8, when the support 70 is attached to the first circuit board 60, the capacitors 253 and 256 are covered by the support 70. A through hole PWPH penetrating from the first surface 60A to the second surface 60B is formed in the first circuit board 60. A first power terminal 93 (see FIG. 11) is inserted into the through hole PWPH of the first circuit board 60.

[0084] As shown in FIG. 9, a rotation angle sensor 23a is mounted on the first surface 60A of the first circuit board 60. The rotation angle sensor 23a is, for example, a spin valve sensor. The spin valve sensor is an element in which a non-magnetic layer is sandwiched between a pinned layer of a ferromagnetic material with the magnetization direction fixed by an antiferromagnetic layer or the like and a free layer of a ferromagnetic material, and is a sensor capable of detecting a change in the direction of magnetic flux. Spin valve sensors include GMR (Giant Magneto Resistance) sensors and TMR (Tunnel Magneto Resistance) sensors. Note that the rotation angle sensor 23a may be any sensor capable of detecting the rotation of the magnet 32. The rotation angle sensor 23a may be, for example, an AMR (Anisotropic Magneto Resistance) sensor or a Hall sensor.

[0085] As described above, the ECU 10 includes a first circuit board 60, a second housing 11, a support 70 serving as a heat sink, and a terminal block 80. On the first circuit board 60, a field effect transistor TR that outputs a current for exciting the first motor coil 37 or the second motor coil 38, and a rotation angle sensor 23a disposed on an extension line of the axial direction AX of the shaft 31 are mounted. The second housing 11 is provided on the anti-load side of the first circuit board 60. The support 70 is provided on the load side of the first circuit board 60 and sandwiches the first circuit board 60 between the support 70 and the second housing 11. The terminal block 80 is fixed to a contact surface 73 of a first side surface 74 of the support 70 serving as a heat sink, and electrically connects the first motor coil wiring 321 or the second motor coil wiring 322 and the first circuit board 60.

[0086] Thereby, the first circuit board 60 is sandwiched in the axial direction AX by the second housing 11 and the support 70 serving as a heat sink. For this reason, the size in the axial direction AX parallel to the shaft 31 of the motor 30 is suppressed, and the electric drive device 1 becomes smaller. The terminal block 80 is fixed to and supported by the contact surface 73 of the first side surface 74 of the support 70. For this reason, even when the terminal block 80 is pressed by a fixing member BM such as a screw, the stress associated with the pressing is applied to the support 70, and the stress applied to the first circuit board 60 is reduced. As a result, the life of the first circuit board 60 is extended, and the reliability of the electric drive device 1 is improved.

[0087] The first housing 930 has a tool insertion hole 36H. The motor 30 includes a side cover 36 that closes the tool insertion hole 36H and is detachable from the first housing 930. Thereby, electrical connection or disconnection between the motor 30 and the ECU 10 can be easily achieved by attaching and detaching the side cover 36.

[0088] On the second surface 60B on the second housing 11 side of the first circuit board 60, the field effect transistor TR is mounted, and on the first surface 60A on the support 70 side, capacitors 253 and 256 which are electrolytic capacitors are mounted. Thereby, both surfaces of the first circuit board 60 are effectively utilized, and the radial direction of the first circuit board 60 can also be made smaller.

[0089] The support 70 has a first top plate 71 that covers the capacitor 253. A magnet 32 is inserted into an axial through-hole 76 formed in the top plate at a position that does not overlap with the capacitor 253. As a result, the cooling of the capacitor 253 is promoted by heat conduction to the first top plate 71. Then, the first side surface 74 of the support 70 generated by the size of the capacitor 253 in the axial direction AX can be used as the contact surface 73 with the terminal block 80. Also, at a position that does not overlap with the capacitor 253, since the magnet 32 is inserted, the space outside the magnet 32 in the radial direction can also be used as the arrangement area of the capacitor 253. As a result, the size of the electric drive device 1 in the axial direction AX is reduced.

[0090] There is a step between the first top plate 71 and the second top plate 79. As a result, the support 70 becomes a heat sink with a minimum volume according to the sizes of the capacitors 253 and 256, contributing to the weight reduction of the electric drive device 1.

[0091] FIG. 11 is a perspective view of the load side of the power wiring module according to Embodiment 1. FIG. 12 is a plan view of the load side of the power wiring module according to Embodiment 1. FIG. 13 is a perspective view of the non-load side of the power wiring module according to Embodiment 1. FIG. 14 is a plan view of the non-load side of the power wiring module according to Embodiment 1. As shown in FIGS. 11 to 14, the power wiring module 90 connects a power wiring PW (see FIG. 2) that transmits power from a power supply device 183 connected to a connector CNT2 (see FIG. 24) to a lead frame in the module and transmits it to the first circuit board 60 and the second circuit board 20.

[0092] The first resin 90P of the power wiring module 90 is, for example, polybutylene terephthalate (PBT). The lead frame embedded in the first resin 90P is formed of, for example, a copper alloy.

[0093] The greater the power for driving the motor, the larger the power supply wiring within the substrate needs to be, and the area of the substrate increases. Therefore, it is desired to reduce the power supply wiring within the substrate. Since there is a lead frame within the power supply wiring module 90, the area of the power supply wiring on the first circuit board 60 is suppressed. As a result, the area of the first circuit board 60 is suppressed, and the ECU 10 becomes smaller in the radial size.

[0094] The power supply wiring module 90 is attached with a choke coil 91 shown in FIG. 13 and a capacitor 92 shown in FIG. 11. The choke coil 91 and the capacitor 92 constitute a noise filter, and the noise filter removes the noise of the high-frequency component superimposed on the power wiring PW. The capacitor 92 is an electronic component with a lead 92L.

[0095] As shown in FIG. 13, a through hole 92H is opened in the first resin 90P of the power supply wiring module 90 from the second surface 90B to the first surface 90A (see FIG. 11). As shown in FIG. 11, the power supply wiring module 90 has a wall portion 92W protruding from the first surface 90A to the load side. The space surrounded by the wall portion 92W shown in FIG. 12 is connected to the through hole 92H shown in FIG. 13.

[0096] The side surface of the capacitor 92 is surrounded by the wall portion 92W. The length of the wall portion 92W from the first surface is larger than the length in the axial direction AX of the capacitor 92. For this reason, since the capacitor 92 does not protrude from the wall portion 92W, the capacitor 92 is protected even if the position in the axial direction AX of the capacitor 92 varies.

[0097] The through hole 92H is filled with a second resin 99. The second resin 99 is, for example, an ultraviolet curable silicone resin (silicone rubber). The second resin 99 has more elasticity than the first resin 90P of the power supply wiring module 90. Thereby, the vibration transmitted to the capacitor 92 is suppressed. Instead of silicone rubber, other ultraviolet curable acrylic resins or ultraviolet curable epoxy resins may be used for the second resin 99. The second resin 99 enters at least a part of the side surface of the capacitor 92 and the wall portion 92W. The filling amount of the second resin 99 is such that about half of the length of the capacitor 92 main body in the axial direction AX is filled.

[0098] Thereby, after the power supply wiring module 90 is molded, the capacitor 92 can be easily electrically connected to the lead frame by inserting the capacitor 92 into the through hole 92H. The lead 92L of the capacitor 92 is bent at approximately 90 degrees. Further, since the second resin 99 fixes between the capacitor 92 and the inner wall of the through hole 92H, the capacitor 92 is less likely to shake due to the vibration transmitted to the electric drive device 1, and stress is less likely to be transmitted to the electrical connection portion between the capacitor 92 and the region C wiring. As a result, the vibration resistance of the electric drive device 1 can be enhanced and the reliability can be improved.

[0099] As shown in FIG. 13, at the edge of the through hole 92H, there is a first protruding portion 92P that protrudes in the anti-load direction from the second surface 90B along the edge. A slit 92S is cut out in a part of the first protruding portion 92P. The lead 92L of the capacitor 92 passes through the slit 92S of the first protruding portion 92P, and the lead 92L of the capacitor 92 is electrically connected to the lead frame and a low melting point metal such as solder outside the first protruding portion 92P. Thereby, the spread of the second resin 99 beyond the through hole 92H is suppressed.

[0100] As shown in FIG. 13, in the first resin 90P of the power supply wiring module 90, a recess 91H is recessed from the second surface 90B toward the first surface 90A (see FIG. 11). The choke coil 91 is inserted into the recess 91H. A second resin 99 is filled between the inner wall of the recess 91H and the choke coil 91. Thus, since the second resin 99 fixes between the choke coil 91 and the recess 91H, the choke coil 91 is less likely to shake due to the vibration transmitted to the electric drive device 1, and stress is less likely to be transmitted to the electrical connection portion between the choke coil 91 and the lead frame. As a result, the vibration resistance of the electric drive device 1 can be enhanced and the reliability can be improved.

[0101] At the edge of the recess 91H, there is a second protruding portion 91P protruding from the second surface 90B in the anti-load direction along the edge of the recess 91H, and a part of the second resin 99 is between the second protruding portion 91P and the choke coil 91. Thereby, the spread of the second resin beyond the recess 91H is suppressed. For example, the second resin 99 may be only on one side between the second protruding portion 91P and the choke coil 91 and not on the other side.

[0102] As shown in FIG. 11, the power supply wiring module 90 includes a first power supply terminal 93 and a second power supply terminal 96 protruding from the first surface 90A. In the power supply wiring module 90, the resin of the base portions 97 of the first power supply terminal 93 and the second power supply terminal 96 is thicker than the periphery of the base portions 97. Thereby, the first power supply terminal 93 and the second power supply terminal 96 are less likely to tilt with respect to the axial direction.

[0103] On the load side of the lid body 40, the input / output terminals of the connector CNT1, the power supply connector terminals PWCH1 and PWCH2 of the connector CNT2, and the input / output terminals of the connector CNT3 penetrate the lid body 40 in the axial direction and protrude from the main body of the lid body 40 (see FIGS. 21, 23, and 26).

[0104] As shown in FIG. 14, in the space adjacent to the first power input portion PWin1 and the second power input portion PWin2 of the lead frame, a through hole INH for power input is opened in the resin. When the power supply wiring module 90 is attached to the lid 40, the power supply connector terminals PWCH1 and PWCH2 are inserted into the through hole INH. The first power input portion PWin1 and the power supply connector terminal PWCH1 are electrically connected by a low melting point metal such as solder or welding, and the second power input portion PWin2 and the power supply connector terminal PWCH1 are electrically connected by a low melting point metal such as solder or welding. Thereby, while ensuring insulation and suppressing the thickness in the axial direction AX, the connector CNT2 and the power supply wiring module 90 can be electrically connected.

[0105] The second circuit board 20 is attached to the power supply wiring module 90. The second power terminals 96 are inserted into and electrically connected to the through holes PWCIN1 and PWCIN2 (see FIG. 27A) of the second circuit board 20 described later. Also, the input / output terminals of the connector CNT1 are inserted into and electrically connected to the through hole CNTIN1 (see FIG. 27A) of the second circuit board 20 described later. Similarly, the input / output terminals of the connector CNT3 are inserted into and electrically connected to the through hole CNTIN3 (see FIG. 27A) of the second circuit board 20 described later.

[0106] The first power terminal 93 shown in FIG. 11 is longer than the second power terminal 96. Thereby, power is supplied from the power supply wiring module 90 to both the first circuit board 60 and the second circuit board 20 that are different in position in the axial direction AX.

[0107] FIG. 15 is a circuit diagram showing an equivalent circuit of the power supply wiring module of Embodiment 1. As shown in FIG. 15, independent first and second power supply circuits 90R and 90L receive power from different first and second power supply input parts PWin1 and PWin2, respectively. The circuits of choke coil 91 and capacitor 92 constitute a noise filter. The circuits of choke coil 91 and capacitor 92 are also separate for each of the first and second power supply circuits 90R and 90L. Then, the noise-removed power is branched in the power supply wiring module 90 into a first power supply terminal 93 that supplies power to the first circuit board 60 and a second power supply terminal 96 that supplies power to the second circuit board 20.

[0108] The first power supply terminal 93 of the first power supply circuit 90R is connected to the first power circuit 25A (see FIG. 6). The first power supply terminal 93 of the second power supply circuit 90L is connected to the second power circuit 25B (see FIG. 6).

[0109] The second power supply terminal 96 of the first power supply circuit 90R is connected to one control arithmetic circuit 24IC (see FIG. 6). The first power supply terminal 93 of the second power supply circuit 90L is connected to the other control arithmetic circuit 24IC (see FIG. 6).

[0110] In this way, the electric drive device 1 of the embodiment independently receives two systems of power and drives them separately into two systems, namely the first coil group Gr1 and the second coil group Gr2, so that the functional continuity is improved.

[0111] FIG. 16 is a plan view showing a lead frame of the power supply wiring module of Embodiment 1. As shown in FIG. 16, the first lead frame 500A and the second lead frame 500B are separated by a power supply system dividing line LB3. The first lead frame 500A and the second lead frame 500B are molded with an insulating resin to form the power supply wiring module 90.

[0112] As shown in FIG. 16, the first lead frame 500A and the second lead frame 500B each include a first positive electrode frame 51A, a second positive electrode frame 51B, and a first negative electrode frame 52. A set of the first positive electrode frame 51A, the second positive electrode frame 51B, and the first negative electrode frame 52 are each of the same shape and are arranged rotationally symmetrically about the axial direction AX of the shaft 31 described above. That is, when one of the first positive electrode frames 51A rotates about a reference point on the extension line of the axial direction AX of the shaft 31, they overlap. The same applies to the second positive electrode frame 51B and the first negative electrode frame 52. The first lead frame 500A and the second lead frame 500B are partitioned by a power supply system dividing line LB3. The power supply system dividing line LB3 passes through the extension line of the center of the shaft 31 (see FIG. 4) extending in the axial direction AX. There are no conductors such as lead frames on the power supply system dividing line LB3, and it will be filled with resin, so that the first power supply circuit 90R and the second power supply circuit 90L are separated and partitioned by the power supply system dividing line LB3.

[0113] The first lead frame 500A includes a first ground frame 53A. The second lead frame 500B includes a second ground frame 53B. The first ground frame 53A and the second ground frame 53B have different shapes. Although there is a portion where the first positive electrode frame 51A and the first negative electrode frame 52 overlap in the axial direction AX, an insulating resin enters between the first positive electrode frame 51A and the first negative electrode frame 52 and they are insulated.

[0114] As shown in FIG. 16, an inductor 91 is connected between a first positive electrode frame 51A and a second positive electrode frame 51B. A capacitor 92 is connected between the first positive electrode frame 51A and a first negative electrode frame 52. A capacitor 92 is connected between a first ground frame 53A and the first negative electrode frame 52. A capacitor 92 is connected between the first ground frame 53A and the first positive electrode frame 51A. A capacitor 92 is connected between a second ground frame 53B and the first positive electrode frame 51A. As a result, power with reduced noise is supplied to the first circuit board 60 and the second circuit board 20 in a state where the lengths of the power supply paths of the first system and the second system are equal.

[0115] When the inductor 91 and the capacitor 92 of the first system of the first lead frame 500A are rotated 180 degrees about a reference point on the extension line of the axial direction AX of the shaft 31, they overlap with the inductor 91 and the capacitor 92 of the second system. Thereby, the path lengths of the first power supply circuit 90R and the second power supply circuit 90L are made equal even via the noise filter circuit.

[0116] As shown in FIG. 16, a first power input section PWin1 has a positive electrode PWin1+ and a negative electrode PWin1-. A second power input section PWin2 has a positive electrode PWin2+ and a negative electrode PWin2-. When viewed in a first direction AD1 orthogonal to the axial direction AX, the polarities of the first power input section PWin1 and the second power input section PWin2 are arranged in the order of positive electrode PWin1+, negative electrode PWin1-, negative electrode PWin2-, and positive electrode PWin2+.

[0117] FIG. 17 is an explanatory diagram for explaining the input side of the connector according to Embodiment 1. The first power connector terminals of the connector of the first system are arranged in the order of a positive electrode input terminal 55A and a negative electrode input terminal 56A when viewed in a second direction AD2. The second power connector terminals of the connector of the second system are arranged in the order of a positive electrode input terminal 55B and a negative electrode input terminal 56B when viewed in the second direction AD2.

[0118] FIG. 18 is a perspective view showing a state in which the input terminals of the connector according to Embodiment 1 are connected to the lead frame of the power wiring module. The positive input terminal 55A includes an input piece 551A, an output piece 553A, and a connection piece 552A that connects the input piece 551A and the output piece 553A. The negative input terminal 56A includes an input piece 561A, an output piece 563A, and a connection piece 562A that connects the input piece 561A and the output piece 563A. The positive input terminal 55B includes an input piece 551B, an output piece 553B, and a connection piece 552B that connects the input piece 551B and the output piece 553B. The negative input terminal 56B includes an input piece 561B, an output piece 563B, and a connection piece 562B that connects the input piece 561B and the output piece 563B. The connection piece 552B draws an arc and, as viewed from AD2, reverses the order of the input side and the output side of the positive input terminal 55B and the negative input terminal 56B.

[0119] FIG. 19 is a perspective view showing a state in which the input terminals of the connector according to Embodiment 1 are connected to the lead frame of the power wiring module. FIG. 19 shows a state on the opposite side of the axial direction AX of FIG. 18. FIG. 20 is a plan view showing a state in which the input terminals of the connector according to Embodiment 1 are connected to the lead frame of the power wiring module. As shown in FIGS. 18, 19, and 20, the positive electrode PWin1+ and the output piece 553A are joined and electrically conductive. The negative electrode PWin1- and the output piece 563A are joined and electrically conductive. The positive electrode PWin2+ and the output piece 553B are joined and electrically conductive. The negative electrode PWin2- and the output piece 563B are joined and electrically conductive. As shown in FIG. 20, the first direction AD1 and the second direction AD2 are parallel. Note that the first direction AD1 and the second direction AD2 may be different directions.

[0120] FIG. 21 is a perspective view showing the upper surfaces of the lid body and the connector according to Embodiment 1. FIG. 22 is a perspective view showing the back surface of the lid body according to Embodiment 1. FIG. 23 is a cross-sectional view showing a cross-section of the electric drive device according to Embodiment 1. FIG. 24 is a perspective view showing the back surface of the connector according to Embodiment 1.

[0121] As shown in FIG. 21, the connector CNT is divided into a connector CNT1, a connector CNT2, and a connector CNT3 according to function. The connector CNT1, the connector CNT2, and the connector CNT3 are respectively attached to the lid 40 via sealing members CNO1, CNO2, and CNO3 such as O-rings. The sealing members CNO1, CNO2, and CNO3 are so-called O-rings formed of rubber or elastomer. The sealing members CNO1, CNO2, and CNO3 may be collectively referred to as the sealing member CNO. Connector holes CNTH penetrating in the axial direction AX are respectively formed in the connector CNT1, the connector CNT2, and the connector CNT3. The connector CNT1, the connector CNT2, and the connector CNT3 each have a socket portion 49 for receiving a plug of a harness.

[0122] The input / output terminals of the connector CNT1 pass outside the power wiring module 90 and outside the heat sink 29, and are inserted into and electrically connected to the through holes of the second circuit board 20. Similarly, the input / output terminals of the connector CNT3 pass outside the power wiring module 90 and outside the heat sink 29, and are inserted into and electrically connected to the through holes of the second circuit board 20.

[0123] As shown in FIG. 22, recessed positioning holes 421H, 422H, 423H, 424H and support protrusions 422, 423, 424 protruding to the load side are arranged with respect to the reference surface 490 on the load side of the lid 40. The positioning convex portion 95PD (see FIG. 13) of the power wiring module 90 is inserted into the positioning hole 421H, and the position of the power wiring module 90 with respect to the lid 40 is determined. As shown in FIG. 11, a cylindrical body 94 covering the support protrusion 422 is integrally formed on the power wiring module 90. A through hole is provided at the center of the cylindrical body 94, and there is a hollow space inside the cylindrical body. The support protrusion 422 is inserted into the hollow spaces inside the three cylindrical bodies 94. A fixing member B9 (see FIG. 7) such as a bolt penetrates the cylindrical body 94 and is fastened to the female screw portion provided in the positioning hole 422H of the support protrusion 422. As shown in FIG. 22, a metal fixing member B8 passing through the heat sink 29 (see FIG. 7) is fastened to the positioning hole 424H of the support protrusion 423.

[0124] The second circuit board 20 shown in FIG. 7 abuts against and is supported by the support convex portion 423 shown in FIG. 22. As shown in FIG. 7, a fixing member B7 such as a bolt passes through the second circuit board 20 and is fastened to the female screw portion provided in the positioning hole 423H of the support convex portion 423 shown in FIG. 22.

[0125] The back surface of the lid body 40 has a reference surface 490 on the load side of the lid body 40. A choke coil 91 is inserted into a recess 491 recessed from the reference surface 490. The bottom surface of the recess 491 serves as a heat dissipation surface of the choke coil 91 and one capacitor 92 via a heat dissipation material called TIM (Thermal Interface Material).

[0126] On the side of the lid body 40 opposite to the load side, there are a first surface 44 and a connector pedestal portion protruding from the first surface 44 toward the side opposite to the load side. The connector pedestal portion has a second surface 45 formed by a part of the lid body 40 protruding from the first surface 44 and a side surface 451 between the first surface 44 and the second surface 45. In Embodiment 1, there are three connector pedestals according to the shapes of the connectors CNT1, CNT2, and CNT3, respectively.

[0127] A plurality of female screw portions 45H are formed on the second surface 45. Fixing members B5 such as bolts pass through the connector holes CNTH and are respectively fastened to the female screw portions 45H. As a result, the connectors CNT1, CNT2, and CNT3 are respectively fixed to the lid body 40. Then, the connector terminals 484 (see FIG. 24) of the connectors CNT1, CNT2, and CNT3 respectively pass through through-holes 41H, 42H, and 43H formed in the lid body 40 in the axial direction AX and reach the opposite side of the lid body 40. The through-holes 41H, 42H, and 43H are provided on the second surface 45 of the connector pedestal and penetrate from the second surface 45 to the back surface of the lid body 40.

[0128] When viewed in the axial direction, the second circuit board 20, the heat sink 29, and the power wiring module 90 are sized to be arranged inside the outer shape of the lid 40. When the lid 40 is assembled so as to close the accommodation space 11R (see FIG. 7) of the second housing 11, the second circuit board 20, the heat sink 29, and the power wiring module 90 are accommodated in the accommodation space 11R.

[0129] As shown in FIG. 23, when the lid 40 covers the accommodation space 11R (see FIG. 7) of the second housing 11 via the above-described sealing member CNO (see FIG. 21), the accommodation space 11R of the second housing 11 is sealed. The sealing support portion 400 has a base portion 402 facing the inner wall 13 of the second housing 11, a tip portion 403 on the load side with respect to the base portion 402, and an annular groove portion 401 that is between the base portion 402 and the tip portion 403 and a part of the outer periphery is recessed. As in the enlarged portion Q3 of FIG. 23, the tip portion 403 has an inclined surface 403T whose outer periphery becomes larger outward as it goes from the load side to the anti-load side.

[0130] As shown in FIG. 23, the second housing 11 and the lid 40 are sealed via a sealing member OR2 (second sealing member). The sealing member OR2 is a so-called O-ring formed of rubber or an elastomer.

[0131] As shown in FIGS. 22 and 23, the lid 40 has a sealing support portion 400 that protrudes annularly from the back surface 411 to the anti-load side and is inserted into the second housing 11.

[0132] The sealing member OR2 fits into the groove portion 401 and is sandwiched between the inner wall 13 of the second housing 11 and the groove portion 401 of the sealing support portion 400. The diameter of the sealing member OR2 is larger than the distance between the inner wall 13 and the sealing support portion 400. For this reason, the sealing member OR2 deforms in the axial direction AX.

[0133] The sealing member OR2 is housed in the space surrounded by the base portion 402, the inner wall 13, the tip portion 403, and the groove portion 401. In the axial direction AX of the sealing member OR2, at least one of the gap with the base portion 402 and the gap with the tip portion 403 is generated. Thereby, the deformation of the sealing member OR2 does not widen the space between the back surface 411 of the lid body 40 and the end surface 12 on the anti-load side of the second housing 11, so that the adhesion between the second housing 11 and the lid body 40 can be maintained.

[0134] In the groove portion 401, together with the sealing member OR2, grease for suppressing the deterioration of the sealing member OR2 is enclosed. Due to the presence of the tip portion 403, the grease is less likely to leak into the interior of the second housing 11 in the groove portion 401. Further, in the axial direction AX, there is a step 14 on the inner wall 13 of the second housing 11 at a position on the load side rather than the tip portion 403. Even if the grease leaks from the groove portion 401, the step 14 stores the grease, so that the grease is less likely to enter the second housing and have an adverse effect on the second circuit board 20 or the like.

[0135] The distance between the inner wall 13 of the second housing 11 and the base portion 402 is smaller than the distance between the inner wall 13 of the second housing 11 and the tip portion 403. Thereby, the gap between the inner wall 13 of the second housing 11 and the base portion 402 becomes small, and high-pressure water is less likely to penetrate.

[0136] Reducing the gap between the inner wall 13 of the second housing 11 and the base 402 improves waterproof performance, but makes it difficult to insert the sealing support portion 400 into the second housing 11. In Embodiment 1, the end face 12 on the anti-load side of the second housing 11 and the inner wall 13 of the second housing 11 have a chamfered inclined surface 12T at the corner where they intersect. When inserting the sealing support portion 400 into the second housing 11, part of the inclined surface 403T abuts against part of the inclined surface 12T, making it easier for the tip portion 403 of the sealing support portion 400 to penetrate into the second housing 11. The angle formed by the inclined surface 12T with respect to the axial direction AX is smaller than the angle formed by the inclined surface 403T with respect to the axial direction AX. This reduces the contact area between the tip portion 403 and the inclined surface 12T, facilitating the insertion of the sealing support portion 400 into the second housing 11. Note that the inclined surfaces 12T and 403T are tapered, but may also be curved surfaces. If the inclined surface 12T is a curved surface, the contact area between the tip portion 403 and the inclined surface 12T is reduced, facilitating the insertion of the sealing support portion 400 into the second housing 11.

[0137] Even if high-pressure water attempts to penetrate from the outside, the opposing portion between the back surface 411 and the end face 12 suppresses water intrusion. Even if water penetrates beyond the opposing portion between the back surface 411 and the end face 12, the opposing portion between the base 402 and the inner wall 13 suppresses water intrusion. Furthermore, the sealing member OR2 sandwiched between the inner wall 13 and the sealing support portion 400 suppresses water intrusion. As a result, the waterproof level of the electric drive device 1 is improved, and sufficient waterproof performance can be maintained even under high water pressure. And the electric drive device 1 can meet IPx9K of the standard JIS D 5020.

[0138] Also, the inner peripheral surface of the first housing 930 and the outer peripheral surface of the second housing 11 are sealed via a sealing member OR1 (first sealing member). The sealing member OR1 is a so-called O-ring formed of rubber or elastomer.

[0139] The sealing members OR1, OR2, and CNO enhance the sealing performance of the electric drive device. When the sealing performance is enhanced, heat from the electronic components on the first circuit board 60 and the second circuit board 20 is less likely to be released to the outside, and it is necessary to suppress the temperature rise inside the electric drive device.

[0140] On one surface of the lid body 40 on the load side, the second circuit board 20 and the power wiring module 90 are attached. On the other surface of the lid body 40 on the opposite side of the load, the connector CNT is attached. When the lid body 40 is attached to the second housing 11, the second circuit board 20 and the power wiring module 90 are accommodated in the accommodation space 11R of the second housing 11. As a result, the size of the ECU 10 in the axial direction AX becomes smaller.

[0141] As shown in FIG. 23, the input / output terminals for inputting / outputting data of the torque sensor 194 (see FIG. 2) connected to the connector CNT1 are directly connected to the second circuit board 20 without passing through the power wiring module 90. Similarly, the communication terminals for performing CAN communication connected to the connector CNT3 are also directly connected to the second circuit board 20 without passing through the power wiring module 90.

[0142] As shown in FIG. 24, sealing members CNO1, CNO2, and CNO3 are respectively arranged on the outer periphery of the sealing support portion 483. The sealing support portion 483 protrudes toward the load side from the back surface 482 of the base portion and has a cylindrical shape. The outer diameter of the sealing support portion 483 is larger than the inner diameter of the sealing member CNO2. The sealing support portion 483 is arranged around the connector terminal 484. As a result, the resin molding accuracy is improved and the shape of the sealing support portion 483 is stabilized. Consequently, the sealing performance of the seal accommodation space is enhanced.

[0143] As shown in FIG. 24, the two positioning convex portions 46 protrude toward the load side from the back surface 482 of the base portion. As shown in FIG. 21, two recesses 46H are formed in the second surface 45. When the positioning convex portion 46 is inserted into the recess 46H, the temporary position of the connector CNT2 with respect to the connector pedestal portion is determined. Then, the fixing member B5 passes through the connector hole CNTH and is fastened to the female screw portion 45H respectively.

[0144] FIG. 25 is an exploded cross-sectional view of the lid body and the connector according to Embodiment 1. FIG. 26 is a cross-sectional view of the assembled lid body and the connector according to Embodiment 1. The connector CNT2 has a base portion 48, a socket portion 49 protruding from the base portion 48 toward the non-load side, a connector terminal 484 inserted into the through-hole 42H, and a sealing member CNO2. The base portion 48 has a cover portion 481 and a sealing support portion 483, the outer edge of which protrudes toward the load side from the back surface 482 of the base portion 48, surrounds the outer edge of the connector pedestal portion, and covers a part of the side surface 451 of the connector pedestal portion. The sealing support portion 483 is disposed around the connector terminal 484. In FIG. 25, the power connector terminal PWCH1 and the power connector terminal PWCH2 are exposed from the tip of the connector terminal 484.

[0145] The through-hole 42H has a first inner wall 452 having a first diameter L31, a second inner wall 454 having a second diameter L32 smaller than the first diameter L31, and a first bottom portion 453 between the first inner wall 452 and the second inner wall 454. The through-hole 42H further has a third inner wall 456 having a third diameter L33 smaller than the second diameter L32, and a second bottom portion 455 between the second inner wall 454 and the third inner wall 456.

[0146] The diameter of the sealing support portion 483 is equal to the second diameter L32. The maximum width L34 of the connector terminal 484 is smaller than the second diameter L32, and there is a gap 489 between the sealing support portion 483 and the connector terminal 484. The sealing member CNO2 has a diameter φ.

[0147] As shown in FIG. 26, the sealing member CNO2 is inserted into the through-hole 42H together with the connector terminal 484. The sealing member CNO2 is sandwiched between the first inner wall 452 of the through-hole 42H and the side surface 483S of the sealing support portion 483.

[0148] The diameter φ of the sealing member CNO2 is larger than the distance L22 between the first inner wall 452 of the through hole 42H and the sealing support portion 483. For this reason, although the sealing member CNO2 deforms in the axial direction AX, it does not become larger than the distance L21 between the back surface 482 of the base portion 48 and the first bottom portion 453. For this reason, the sealing member CNO2 is accommodated in a seal accommodation space surrounded by the back surface 482 of the base portion 48, the first inner wall 452, the first bottom portion 453, and the side surface 483S of the sealing support portion 483, and at least one of the gap G1 and the gap G2 is generated in the axial direction AX of the sealing member CNO2. Thereby, since the deformation of the sealing member CNO2 does not widen the space between the back surface 482 of the base portion 48 and the second surface 45 of the lid body 40, the contact surface between the back surface 482 of the base portion 48 and the second surface 45 of the lid body 40 can be maintained.

[0149] The side surface 483S of the sealing support portion 483 is in contact with the second inner wall 454. Thereby, even if grease for suppressing deterioration of the sealing member CNO2 is enclosed inside the seal accommodation space, the grease is less likely to leak. The end portion 483P on the load side of the sealing support portion 483 is not in contact with the second bottom portion 455. For this reason, a distance L23 is formed between the end portion 483P of the sealing support portion 483 and the second bottom portion 455. The distance L23 is, for example, about 2 mm.

[0150] Even if high-pressure water tries to penetrate from the outside, the eaves portion 481 suppresses the penetration of water. Even if water penetrates beyond the eaves portion 481, the sealing member CNO2 sandwiched between the first inner wall 452 of the through hole 42H and the sealing support portion 483 suppresses the penetration of water. As a result, the waterproof level of the electric drive device 1 is improved, and sufficient waterproofness can be maintained even under high water pressure.

[0151] The back surface 482 of the base portion 48 and the second surface 45 of the lid body 40 are in close contact. The second surface 45 of the lid body 40 is a milled surface, and the surface roughness is small. The gap between the back surface 482 of the base portion 48 and the second surface 45 of the lid body 40 is smaller than the distance L11 described above. Thereby, even if water penetrates beyond the eaves portion 481, the contact surface between the back surface 482 of the base portion 48 and the second surface 45 of the lid body 40 suppresses the penetration of water.

[0152] As shown in FIG. 26, the load-side end portion 481P of the eaves portion 481 protrudes toward the first surface 44 side rather than the mating surface SS between the back surface 482 of the base portion 48 and the second surface 45 of the lid body 40.

[0153] The distance L11 between the load-side end portion 481P of the eaves portion 481 and the first surface 44 of the lid body 40 is narrower than the distance between the inner wall 481S of the eaves portion 481 and the side surface 451 of the connector pedestal portion. The distance L11 is, for example, 1 mm or more and 1.5 mm or less. The distance L12 between the eaves portion 481 and the side surface 451 of the connector pedestal portion is larger than the distance L11 between the eaves portion 481 and the first surface 44 of the lid body 40. For example, the distance L12 is 2 mm or more and 3 mm or less. And the space between the eaves portion 481 and the side surface 451 of the connector pedestal portion is larger than the space between the eaves portion 481 and the first surface 44 of the lid body 40. Thus, even if water intrudes beyond the eaves portion 481, since the space between the eaves portion 481 and the side surface 451 of the connector pedestal portion is larger than the space between the eaves portion 481 and the first surface 44 of the lid body 40, it is difficult for water to reach between the back surface 482 of the lid body 40 and the second surface 45 of the lid body 40. As a result, the waterproof level of the electric drive device 1 is improved, and sufficient waterproofness can be maintained even under high water pressure.

[0154] As described above, the structure of the connector CNT2 has been explained. Since the connectors CNT1 and CNT3 also have the same structure, the description of the structures of the connectors CNT1 and CNT3 is omitted. The same applies to the embodiments described later.

[0155] The support 70, which is a heat sink, has an outer shape that enters inside the sealing member OR1 when viewed in the axial direction. Thereby, the support 70 can be accommodated inside the first housing 930. The heat sink 29 has an outer shape that enters inside the sealing member OR2 when viewed in the axial direction. Thereby, the heat sink 29 can be accommodated inside the second housing 11. As a result, while suppressing the temperature rise inside the electric drive device, the electric drive device is miniaturized.

[0156] Here, since the support 70 and the heat sink 29 are to be accommodated inside the first housing 930 or inside the second housing 11, there is an upper limit to the volume. Therefore, the volume of the second housing 11 (heat sink) is made larger than the volume of the support 70 (heat sink), and the heat capacity of the second housing 11 (heat sink) is increased. The support 70 is fixed to the second housing 11 (heat sink) by a metal fixing member B2 (first fixing member). In the first circuit board 60 and the second circuit board 20, electronic components can be mounted on both sides. As shown in FIG. 23, the heat of the electronic components mounted on one surface of the first circuit board 60 is transferred to the second housing 11 (heat sink) through the heat path via the support 70 and the fixing member. As a result, the support 70 is less likely to reach thermal saturation. Also, the heat of the electronic components mounted on the other surface of the first circuit board 60 is transferred to the second housing 11 (heat sink).

[0157] Also, the volume of the lid 40 is made larger than the volume of the heat sink 29, and the heat capacity of the lid 40 is increased. As shown in FIG. 7, the heat of the heat sink 29 is transferred to the lid 40 through the heat path via the metal fixing member B8 (second fixing member). As a result, the heat sink 29 is less likely to reach thermal saturation.

[0158] FIG. 27A is a plan view seen from the load side of the second circuit board according to Embodiment 1. FIG. 27B is a plan view seen from the anti-load side of the second circuit board according to Embodiment 1. FIG. 27C is a side view seen from the side of the second circuit board according to Embodiment 1.

[0159] As shown in FIG. 27A, the second circuit board 20 is provided with through holes PWCIN1, PWCIN2, CNTIN1, and CNTIN3 that penetrate the substrate body of the second circuit board 20 in the axial direction AX.

[0160] The outer shape of the second circuit board 20 has a circular circular edge 20E, a first edge 20E1, and a second edge 20E2. The first edge 20E1 and the second edge 20E2 are linear. The first edge 20E1 and the second edge 20E2 are located at positions sandwiching a reference point on the extension line of the axial direction AX of the shaft 31.

[0161] In FIGS. 27A and 27B, a control system division line LB1 is shown. The control system division line LB1 indicates a division line that divides the first control system region 200A and the second control system region 200B for each system, and is not an actual line. The first control system region 200A is a region where the ground pattern and wiring of the first system are located, and the second control system region is a region where the ground pattern and wiring of the second system are located.

[0162] As shown in FIGS. 27A and 27C, control arithmetic circuits 24IC are respectively arranged in the first control system region 200A and the second control system region 200B. As shown in FIG. 27A, power management circuits 24PM are respectively arranged in the first control system region 200A and the second control system region 200B. Also, as shown in FIGS. 27B and 27C, receptacles 61 are respectively arranged in the first control system region 200A and the second control system region 200B.

[0163] The through-hole PWCIN1 is arranged near the second edge 20E2 and is arranged in the first control system region 200A. The second power supply terminal 96 (see FIG. 11) of the first system is electrically connected to the through-hole PWCIN1. The through-hole PWCIN2 is arranged near the first edge 20E1 and is arranged in the second control system region 200B. The second power supply terminal 96 (see FIG. 11) of the second system is electrically connected to the through-hole PWCIN2.

[0164] As shown in FIG. 27A, in the first control system region 200A, the power management circuit 24PM is arranged in the region between the through-hole PWCIN1 and the control arithmetic circuit 24IC. The power supplied from the second power supply terminal 96 (see FIG. 11) of the first system is voltage-adjusted by the power management circuit 24PM to a voltage suitable for the control arithmetic circuit 24IC.

[0165] As shown in FIG. 27A, in the second control system area 200B, the power management circuit 24PM is arranged in the area between the through hole PWCIN2 and the control arithmetic circuit 24IC. The power supplied from the second power supply terminal 96 (see FIG. 11) of the second system is voltage-adjusted by the power management circuit 24PM to a voltage suitable for the control arithmetic circuit 24IC.

[0166] When a virtual circle CQQ is drawn connecting the area center 24ICX of the control arithmetic circuit 24IC (the first control arithmetic circuit 24IC) in the first control system area 200A and the area center 24ICX of the control arithmetic circuit 24IC (the second control arithmetic circuit 24IC) in the second control system area 200B, with the center on the extension line of the axial direction AX of the shaft 31, the two power management circuits 24PM are arranged at positions overlapping the virtual circle CQQ.

[0167] When a virtual straight line LB4 perpendicular to the control system division line LB1 is drawn with the center on the extension line of the axial direction AX of the shaft 31, the control arithmetic circuit 24IC (the first control arithmetic circuit 24IC) in the first control system area 200A and the power management circuit 24PM (the first power management circuit 24PM) in the first control system area 200A are divided by the virtual straight line LB4.

[0168] The control arithmetic circuit 24IC (the second control arithmetic circuit 24IC) in the second control system area 200B and the power management circuit 24PM (the second power management circuit 24PM) in the second control system area 200B are divided by the virtual straight line LB4.

[0169] As shown in FIG. 27A, the input / output terminals of the connector CNT1 (see FIG. 24) are electrically connected to the through hole CNTIN1. The through hole CNTIN1 is arranged near the first edge 20E1. As shown in FIGS. 27A and 27B, the through hole CNTIN1 is arranged so as to straddle the control system division line LB1.

[0170] As shown in FIG. 27A, the input / output terminals of the connector CNT3 (see FIG. 24) are electrically connected to the through hole CNTIN3. The through hole CNTIN3 is disposed in the vicinity of the second edge portion 20E2. As shown in FIGS. 27A and 27B, the through hole CNTIN3 is disposed so as to straddle the control system division line LB1.

[0171] As shown in FIG. 27A, a part of the circular edge portion 20E of the second circuit board 20 is provided with a notch 20S. The first power supply terminals 93 of the first system and the first power supply terminals 93 of the second system respectively pass through the space surrounded by the extension line 20EL of the circular edge portion 20E of the second circuit board 20 and the notch 20S.

[0172] On the extension line of the axial direction AX of the shaft 31, assuming a virtual straight line LB4 orthogonal to the control system division line LB1, two control arithmetic circuits 24IC and two power management circuits 24PM are dispersedly arranged in the four regions partitioned by the control system division line LB1 and the virtual straight line LB4. Thereby, the heat generated by the two control arithmetic circuits 24IC and the two power management circuits 24PM is dispersed, and the reliability of the operation of the two control arithmetic circuits 24IC is enhanced.

[0173] In the second circuit board 20, the direction CD1 in which the through hole PWCIN1 to which power is supplied, the power management circuit 24PM (the first power management circuit 24PM) in the first control system region 200A, and the control arithmetic circuit 24IC (the first control arithmetic circuit 24IC) in the first control system region 200A are arranged in this order, and the through hole PWCIN2 to which power is supplied, the power management circuit 24PM (the second power management circuit 24PM) in the second control system region 200B, and the control arithmetic circuit 24IC (the second control arithmetic circuit 24IC) in the second control system region 200B are arranged in this order are in opposite directions. In the first control system region 200A, the direction CD1 can be said to be the direction of the current path to which power is supplied. In the second control system region 200B, the direction CD2 can be said to be the direction of the current path to which power is supplied. Thereby, the component layout of the second circuit board 20 becomes efficient, and the size of the second circuit board 20 is suppressed.

[0174] FIG. 28A is a plan view of the first circuit board according to Embodiment 1 as viewed from the load side. FIG. 28B is a plan view of the first circuit board according to Embodiment 1 as viewed from the anti-load side. FIG. 28C is a side view of the first circuit board according to Embodiment 1 as viewed from the side surface side.

[0175] In FIGS. 28A and 28B, a power system division line LB2 is shown. The power system division line LB2 indicates a division line that divides the first power system region 600A and the second power system region 600B for each system, and is not an actual line. The first power system region 600A is a region where the ground pattern and wiring of the first system are located, and the second power system region is a region where the ground pattern and wiring of the second system are located. The power system division line LB2 is formed by connecting division lines LB21, LB22, LB23, LB24, LB25, LB26, and LB27. The division line LB22 and the division line LB26 are parallel. The extending direction of the division line LB24 is different from the extending directions of the division line LB22 and the division line LB26. The division line LB23 connects the division line LB22 and the division line LB24. The division line LB25 connects the division line LB26 and the division line LB24. The division lines LB21 and LB27 are arranged near the edge of the first circuit board 60.

[0176] As shown in FIG. 28A, in the first power system region 600A, a first power circuit 25A, a first motor drive circuit 26A, a shunt resistor SR, a through hole PWPH1, and a through hole of the first bus bar region PWOUT1 are arranged. As shown in FIG. 28A, in the second power system region 600B, a second power circuit 25B, a second motor drive circuit 26B, a shunt resistor SR, a through hole PWPH2, and a through hole of the second bus bar region PWOUT2 are arranged. As shown in FIGS. 28A and 28C, in the first power system region 600A and the second power system region 600B, plugs 62 connected to the receptacle 61 (see FIGS. 27B and 27C) are arranged for each system. Also, as shown in FIGS. 28B and 28C, capacitors 253 and 256 are arranged in the first power system region 600A and the second power system region 600B, respectively.

[0177] As shown in FIG. 28B, the reference point on the extension line of the axial direction AX of the shaft 31 overlaps with the detection circuit 23. The detection circuit 23 is arranged across the power system division line LB2. Thereby, the first terminal group 23p1 of the detection circuit 23 is connected to the first power system region 600A. The first terminal group 23p1 of the detection circuit 23 is the terminal group of one of the rotational angle sensors 23a shown in FIG. 6. The second terminal group 23p2 of the detection circuit 23 is connected to the second power system region 600B. The second terminal group 23p2 of the detection circuit 23 is the terminal group of the other rotational angle sensor 23a shown in FIG. 6. Thereby, the wiring for each system from the two rotational angle sensors 23a can be drawn out separately to the first power system region 600A and the second power system region 600B.

[0178] A partial division line LB24 of the power system division line LB2 straddled by the detection circuit 23 is parallel to the control system division line LB1. Thereby, the arrangement of the terminal groups of the detection circuit 23 can be arranged parallel or orthogonal to the terminal groups of the integrated circuits mounted on the first circuit board 60 and the second circuit board 20, facilitating the wiring design.

[0179] FIG. 29 is a plan view showing the positional relationship between the power system division line and the control system division line when the first circuit board and the second circuit board according to Embodiment 1 are overlapped. As shown in FIG. 29, when the first circuit board 60 and the second circuit board 20 are overlapped, the power system division line LB2 and the control system division line LB1 coincide at the division line LB24, but do not overlap in other parts. As a result, when viewed in the axial direction, the first power system region 600A overlaps both the first control system region 200A and the second control system region 200B. Similarly, when viewed in the axial direction, the second power system region 600B overlaps both the first control system region 200A and the second control system region 200B.

[0180] As described above, the electric drive device 1 according to Embodiment 1 includes a motor 30 and an ECU 10 provided on the anti-load side of the shaft 31 for driving and controlling the motor 30. The motor 30 has a shaft 31, a motor rotor 932, a motor stator 931, and a first housing 930. The shaft 31 extends in the axial direction AX from the load side to the anti-load side. The rotation of the motor rotor 932 is interlocked with the rotation of the shaft 31. The motor stator 931 has a first motor coil 37 and a second motor coil 38, and a first motor coil wiring 321 and a second motor coil wiring 322 for supplying power to each of the first motor coil 37 and the second motor coil 38, and rotates the motor rotor 932. The first housing 930 houses the motor rotor 932 and the motor stator 931 inside. On the anti-load side of the shaft 31, there is a magnet 32 provided for driving and controlling the motor 30.

[0181] The ECU 10 includes a first circuit board 60 (see FIG. 7), a second circuit board 20 (see FIG. 7), a second housing 11 (see FIG. 3), a lid body 40 (see FIG. 3), a power wiring module 90 (see FIG. 11), a connector CNT (see FIG. 3), and a two-board connector 63 (FIG. 7). The first circuit board 60 is partitioned by a power system dividing line LB2 into a first power system region 600A where wiring for outputting a current for exciting the first coil group Gr1 is arranged, and a second power system region 600B where wiring for outputting a current for exciting the second coil group Gr2 is arranged. The second circuit board 20 is partitioned by a control system dividing line LB1 into a first control system region 200A where wiring constituting a control circuit for controlling a current for exciting the first coil group Gr1 is arranged, and a second control system region 200B where wiring constituting a control circuit for controlling a current for exciting the second coil group Gr2 is arranged. When viewed in the axial direction, the first power system region 600A overlaps both the first control system region 200A and the second control system region 200B. When viewed in the axial direction, the second power system region 600B overlaps both the first control system region 200A and the second control system region 200B.

[0182] As a result, among the two inter-board connectors 63, one inter-board connector 63 can connect the first control system area 200A and the first power system area 600A, and the other inter-board connector 63 can connect the second control system area 200B and the second power system area 600B. As a result, large axially intervening components such as the first power module and the second power module described in Patent Document 1 are replaced by the inter-board connector 63, reducing the axial size.

[0183] The ECU 10 is further attached to the lid body 40 and has a connector CNT1 attached to the lid body 40 for inputting and outputting a first signal from the outside, and a connector CNT3 attached to the lid body 40 for inputting and outputting a second signal from the outside. A plurality of connection terminals of the connector CNT1 are connected to a through hole CNT1IN near the first edge 20E1 of the second circuit board 20 so as to be distributed for each system with the control system division line LB1 interposed therebetween. A plurality of connection terminals for each system of the connector CNT3 are connected to a through hole CNTIN3 near the second edge 20E2 of the second circuit board 20 so as to be distributed for each system with the control system division line LB1 interposed therebetween. The first edge 20E1 and the second edge 20E2 are located at positions sandwiching a reference point on the axial extension line of the shaft 31. As a result, it is not necessary to prepare a plurality of connectors for each system, and the number of connectors attached to the lid body is reduced.

[0184] The first lead frame 500A (see FIG. 6) has a first power supply terminal 93 of the first system and a second power supply terminal 96 of the first system (see FIG. 13), and the second lead frame 500B (see FIG. 6) has a first power supply terminal 93 of the second system and a second power supply terminal 96 of the second system (see FIG. 13). As shown in FIG. 27A, the second circuit board 20 has a plurality of notches 20S, and the first power supply terminal 93 of the first system and the first power supply terminal 93 of the second system pass through the notches 20S and reach the first circuit board 60. The first power supply terminal 93 of the first system is connected to the through hole PWPH1 in the first power supply system area 600A. The first power supply terminal 93 of the second system is connected to the through hole PWPH2 in the second power supply system area 600B. As shown in FIG. 28A, the second power supply terminal 96 of the first system is connected to the through hole PWCHIN1 in the first control system area 200A at a position adjacent to the second edge 20E2. The second power supply terminal 96 of the second system is connected to the through hole PWCHIN2 in the second control system area 200B at a position adjacent to the second edge 20E2. Thereby, the power supplied from the outside by the power wiring module 90 is branched into the power supplied to the first circuit board 60 and the power supplied to the second circuit board 20.

[0185] The first circuit board 60 has through-holes in a first bus bar region PWOUT1 to which a first bus bar of a first coil group Gr1 is connected, and through-holes in a second bus bar region PWOUT2 to which a second bus bar of a second coil group Gr2 is connected. When viewed in the axial direction, the through-holes in the first bus bar region PWOUT1 are arranged on an extension line of the control system division line LB1 and are outside the second edge portion 20E2 (see FIG. 27A). The through-holes in the second bus bar region PWOUT2 are arranged on an extension line of the control system division line LB1 and are outside the first edge portion 20E1. By arranging the through-holes in the first bus bar region PWOUT1 and the through-holes in the second bus bar region PWOUT2 on the extension line of the control system division line LB1, signals output from the first power system region 600A and the second power system region 600B to the motor 30 and signals input to the first control system region 200A and the second control system region 200B are arranged in the vicinity of the first edge portion 20EL1 and the second edge portion 20EL2. As a result, when viewed in the axial direction, a layout is facilitated in which the first power system region 600A overlaps both the first control system region 200A and the second control system region 200B, and the second power system region 600B overlaps both the first control system region 200A and the second control system region 200B.

[0186] As a result, the first circuit board 60 is sandwiched in the axial direction AX between the second housing 11 and the support 70 which is a second heat sink. For this reason, the size in the axial direction AX parallel to the shaft 31 of the motor 30 is suppressed, and the electric drive device 1 becomes smaller. The terminal block 80 is fixed to and supported by the contact surface 73 of the first side surface 74 of the support 70. For this reason, even when the terminal block 80 is pressed by a fixing member BM such as a screw, the stress accompanying the pressing is applied to the support 70, and the stress applied to the first circuit board 60 is reduced. As a result, the life of the first circuit board 60 is extended, and the reliability of the electric drive device 1 is improved.

[0187] It has a second circuit board 20 having a control circuit 24 that controls a first power circuit 25A and a second power circuit 25B each having a field effect transistor TR. The second circuit board 20 is disposed on the anti-load side of the second housing 11, and the first circuit board 60 and the second circuit board 20 are electrically connected by an inter-board connector 63 inserted into a through hole 119 in the axial direction AX opened in the second housing 11. Thereby, both axial surfaces of the second housing 11 can be used as heat dissipation surfaces.

[0188] The second circuit board 20 is accommodated in an accommodation space 11R which is a recess provided in the second housing 11. Thereby, the size of the electric drive device 1 in the axial direction AX becomes smaller.

[0189] The motor stator 931 includes a first motor coil wiring 321 connected to the first coil group Gr1 and a second motor coil wiring 322 connected to the second coil group Gr2. There are two terminal blocks 80, and one terminal block 80 and the other terminal block 80 are disposed at positions sandwiching the support 70. Here, one terminal block 80 electrically connects the first motor coil wiring 321 and the first circuit board 60, and the other terminal block 80 electrically connects the second motor coil wiring 322 and the first circuit board 60. Thereby, even if the coil wiring is made redundant, by using a plurality of side surfaces of the support 70, the radial size of the motor 30 is suppressed.

[0190] The second housing 11 and the support 70 are connected by a fixing member B2 such as a screw. Thereby, even if the terminal block 80 is pressed by a fixing member BM such as a screw, the stress accompanying the pressing is transmitted to the support 70, the fixing member B2, and the second housing 11. As a result, the stress applied to the first circuit board 60 is further reduced.

[0191] The ECU 10 includes a first circuit board 60, a second circuit board 20, a second housing 11 that houses the second circuit board 20 and has a through hole 119 penetrating in the axial direction AX, a lid 40 that covers the second housing 11, and an inter-board connector 63. The first circuit board 60 has a plurality of drive elements 252 which are field effect transistors that output a current for exciting a motor coil, and a rotation angle sensor 23a disposed on an extension line of the shaft 31 in the axial direction AX. The first circuit board is disposed on the anti-load side of the shaft 31. The second circuit board 20 has a control circuit 24 that controls the current supplied to the plurality of drive elements 252. The inter-board connector 63 connects the second circuit board 20 disposed on the anti-load side of the second housing 11 and the first circuit board 60 disposed on the load side of the second housing 11, and is disposed in the through hole 119.

[0192] Thereby, while the inter-board connector 63 ensures the transmission of control signals, the second heat sink enhances the heat dissipation performance of the first circuit board and the second circuit board.

[0193] The second housing 11 houses the second circuit board 20 and is sandwiched between the first circuit board 60 and the second circuit board 20, serving as a heat sink that receives the heat of the electronic components of the first circuit board 60 and the electronic components of the second circuit board 20. The support 70 is provided on the anti-load side of the first circuit board 60 and serves as a heat sink that receives the heat of the electronic components of the first circuit board 60. The heat sink 29 is provided on the load side of the second circuit board 20 and receives the heat of the electronic components of the second circuit board 20. The lid 40 covers the anti-load side of the second housing 11, and the lid 40 and the second housing 11 surround the second circuit board 20, the heat sink 29, and the power wiring module 90.

[0194] Thereby, in the axial direction, the support 70 which is a heat sink, the first circuit board 60, the second housing 11 which is a heat sink, the second circuit board 20, the heat sink 29, the power wiring module 90, and the lid 40 are arranged in this order. As a result, while suppressing the volume inside the housing, the sealing performance inside the housing can be enhanced, and the temperature rise inside the housing can be suppressed.

[0195] The ECU 10 includes a first circuit board 60, a second circuit board 20, a second housing 11 that houses the second circuit board 20, a metal lid 40 that covers the second housing 11, a connector CNT2 having a power connector terminal PWCH1 and a power connector terminal PWCH2 that penetrate the lid 40, a power wiring module 90, and a heat sink 29. The first circuit board 60 has a plurality of drive elements 252 that are field effect transistors for outputting a current for exciting a motor coil, and a rotation angle sensor 23a disposed on an extension line of the axial direction AX of the shaft 31. The first circuit board is disposed on the non-load side of the shaft 31. The second circuit board 20 has a control circuit 24 for controlling the current supplied to the plurality of drive elements 252.

[0196] Power is input from the outside to the two systems of the connector CNT2 for each system. The two systems of the connector CNT2 each have a first power connector terminal and a second power connector terminal. The power wiring module has a first lead frame 500A, and the first lead frame 500A has a first power input portion PWin1 connected to output pieces 553A and 563A of the first power connector terminal. The power wiring module 90 has a second lead frame 500B, and the second lead frame 500B has a second power input portion PWin2 connected to output pieces 553 and 563B of the second power connector terminal. And the order of arrangement of the polarities of the input pieces 551A and 561A of the first power connector terminal arranged in the second direction AD2 orthogonal to the axial direction AX is the same as the order of arrangement of the polarities of the input pieces 551B and 561B of the second power connector terminal arranged in the second direction AD2, and the order of arrangement of the input polarities of the first power input portions PWin1+ and PWin1- arranged in the first direction AD1 orthogonal to the axial direction AX of the power wiring module 90 is opposite to the order of arrangement of the input polarities of the second power input portions PWin2+ and PWin2- arranged in the first direction AD.

[0197] As a result, when viewed in the second direction AD2, the order of the polarities of the first power connector terminals 551A and 561A is the same as the order of the polarities of the input pieces 551B and 561B of the second power connector terminals. In contrast, when viewed in the second direction AD2, the order of the polarities of the output pieces 553A and 563A of the first power connector terminals is different from the order of the polarities of the output pieces 553B and 563B of the second power connector terminals. Depending on the order of the polarities of the output pieces of the first power connector terminals and the order of the polarities of the output pieces of the second power connector terminals, the first lead frame 500A and the second lead frame 500B can use frames of the same shape (the first positive electrode frame 51A, the second positive electrode frame 51B, and the first negative electrode frame 52), so the cost can be reduced.

[0198] Also, since the first lead frame 500A and the second lead frame 500B can use frames of the same shape (the first positive electrode frame 51A, the second positive electrode frame 51B, and the first negative electrode frame 52), the positions of the first power terminal 93 and the second power terminal 96 are rotationally symmetric for each system. Specifically, the first power terminal 93 of the first system overlaps with the first power terminal 93 of the second system when rotated 180 degrees about a reference point on the extension line of the axial direction AX of the shaft 31, and the second power terminal 96 of the first system overlaps with the second power terminal 96 of the second system when rotated 180 degrees about this reference point.

[0199] The power wiring module 90 is molded with resin together with a choke coil 91 and a capacitor 92 for noise removal, a lead frame having one end connected to the power connector terminal PWin and supplying power to the first circuit board 60 and the second circuit board, a first power terminal connected to the first circuit board, and a second power terminal connected to the second circuit board. The heat sink 29 is sandwiched between the power wiring module 90 and the second circuit board 20, and sandwiches the power wiring module 90 between itself and the lid 40.

[0200] As a result, since there is power supply wiring in the power supply wiring module 90, the area of the power supply wiring on the first circuit board 60 is suppressed. Consequently, the area of the first circuit board 60 is suppressed, and the ECU 10 becomes smaller in the radial size. Also, since the power supply wiring module 90 is sandwiched between the second housing 11 and the heat sink 29, the heat dissipation performance of the choke coil 91 can be enhanced. As a result, the temperature rise within the second housing 11 is suppressed.

[0201] Among the connectors CNT, the connector CNT2 will be described as an example. The connector CNT2 has a base portion 48, a socket portion 49 that protrudes from the base portion 48 toward the anti-load side, a connector terminal 484 that is inserted into the through hole 42H of the lid body 40, and two sealing members CNO2. The outer edge of the base portion 48 protrudes toward the load side from the back surface 482 of the base portion 48, surrounds the outer edge of the connector pedestal portion of the lid body 40, and has a shielding portion 481 that covers a part of the side surface 451 of the connector pedestal portion. Together with the connector terminal 484, it has a sealing support portion 483 that protrudes toward the load side from the back surface 482 of the base portion 48 and is inserted into the through hole 42H of the lid body 40. The sealing member CNO2 is sandwiched between the first inner wall 452 of the through hole 42H and the sealing support portion 483.

[0202] Thereby, even when high-pressure water attempts to penetrate from the outside, the shielding portion 481 suppresses the penetration of water. Even if water penetrates beyond the shielding portion 481, the sealing member CNO2 sandwiched between the first inner wall 452 of the through hole 42H and the sealing support portion 483 suppresses the penetration of water. As a result, the waterproof level of the electric drive device 1 is improved, and sufficient waterproofness can be maintained even under high water pressure. And the electric drive device 1 can satisfy IPx9K of the standard JIS D 5020.

[0203] Since the lid body 40 is made of metal, the heat dissipation performance of the lid body 40 is high, the deterioration of the sealing member CNO2 is suppressed, and the waterproofness at high temperatures is also improved.

[0204] In addition, the electric power steering apparatus 100 includes the above-described electric drive device 1, and the electric drive device 1 generates an auxiliary steering torque. As described above, the electric drive device 1 can improve waterproof performance even under high water pressure. As a result, the reliability of the electric drive device 1 is improved, and thus the reliability of the electric power steering apparatus 100 is also improved.

[0205] (Embodiment 2) FIG. 30 is a schematic diagram of an electric power steering apparatus according to Embodiment 2. The same components as those described in the above-described Embodiment 1 are denoted by the same reference numerals, and redundant descriptions are omitted.

[0206] As shown in FIG. 30, the electric power steering apparatus 100A according to Embodiment 2 is of a pinion assist type that applies an auxiliary steering torque to the steering shaft 192. As shown in FIG. 30, the steering shaft 192 includes an input shaft 192A and an output shaft 192B. One end of the input shaft 192A is connected to the steering wheel 191, and the other end is connected to a torsion bar. One end of the output shaft 192B is connected to the torsion bar, and the other end is connected to a universal joint 196. The torque sensor 194 detects the steering torque applied to the steering shaft 192 by detecting the twist of the torsion bar. The torque sensor 194 outputs a steering torque signal T corresponding to the detected steering torque to the ECU 10 by CAN communication. The steering shaft 192 rotates by the steering force applied to the steering wheel 191.

[0207] The intermediate shaft 197 transmits the torque of the output shaft 192B. The first rack and pinion mechanism 199 includes a first pinion shaft 199A, a first pinion gear 199B, a rack shaft 199C, and a first rack 199D. One end of the first pinion shaft 199A is connected to the intermediate shaft 197 via a universal joint 198, and the other end is connected to the first pinion gear 199B. The first rack 199D formed on the rack shaft 199C meshes with the first pinion gear 199B. The rotational movement of the steering shaft 192 is transmitted to the first rack and pinion mechanism 199 via the intermediate shaft 197. This rotational movement is converted into a linear movement of the rack shaft 199C by the first rack and pinion mechanism 199. The tie rods 172 are respectively connected to both ends of the rack shaft 199C.

[0208] (Embodiment 3) FIG. 31 is a schematic diagram of an electric power steering apparatus according to Embodiment 3. Note that the same components as those described in Embodiments 1 and 2 are denoted by the same reference numerals, and redundant descriptions are omitted. The electric power steering apparatus 100B shown in FIG. 31 is of a pinion assist type that applies auxiliary steering torque to the first pinion shaft 199A. In the electric power steering apparatus 100B, the torque sensor 194 is connected to the first pinion shaft 199A.

[0209] The motor 30 rotates the worm shaft reduction gear 175. The worm wheel of the reduction gear 175 rotates integrally with the first pinion shaft 199A. Therefore, the motor 30 can rotate the first pinion gear 199B. The first pinion gear 199B meshes with the first rack 199D. As a result, the electric drive device 1 applies an assist force to the first rack 199D via the reduction gear 175. Note that the first pinion gear 199B may be arranged orthogonally to the first rack 199D or may be arranged obliquely offset from the orthogonal direction. As described above, the electric power steering apparatus 100B of Embodiment 3 is of a single pinion assist type.

[0210] (Embodiment 4) FIG. 32 is a schematic diagram of an electric power steering apparatus according to Embodiment 4. Note that the same components as those described in Embodiments 1 to 3 are denoted by the same reference numerals, and redundant descriptions are omitted. The electric power steering apparatus 100C includes an output shaft 192B and a second pinion gear 171B in addition to a first pinion shaft 199A and a first pinion gear 199B. The electric power steering apparatus 100C is of a dual pinion assist type. The torque sensor 194 detects the torque between the pinion shaft 195 and the first pinion gear 199B.

[0211] The motor 30 rotates the worm shaft reduction gear 175. The worm wheel of the reduction gear 175 rotates integrally with the output shaft 192B. Therefore, the motor 30 can rotate the second pinion gear 171B. The second pinion gear 171B meshes with the second rack 171C. As a result, the electric drive device 1 applies an assist force to the second rack 171C via the reduction gear 175. Note that the second pinion gear 171B may be arranged orthogonally to the second rack 171C or may be arranged obliquely offset from the orthogonal direction. The electric power steering apparatus 100C of Embodiment 2 is of a dual pinion assist type.

Description of Reference Numerals

[0212] 1 Electric drive device 10 ECU 11 Second housing 20 Second circuit board 23 Detection circuit 23a Rotation angle sensor 23b Sensor control unit 24 Control circuit 25A First power circuit 25B Second power circuit 29 Heat sink 30 Motor 30G Gear 31 Shaft 32 Magnet 40 Cover 44 First surface 45 Second surface 60 First circuit board 70 Support 80 Terminal block 90 Power wiring module 91 Choke coil 91H Recess 92 Capacitor 92H Through-hole 99 Second resin 100, 100A, 100B, 100C Electric power steering device 930 First housing 931 Motor stator 932 Motor rotor AX Axial direction

Claims

1. A shaft extending axially from the load side to the anti-load side, a motor rotor interlocked with the shaft, a stator core for rotating the motor rotor, and a plurality of coil groups divided into at least two systems of a first coil group and a second coil group for each of the three phases and exciting the stator core with three-phase alternating current, and a motor stator, a motor including the motor rotor, the motor stator, and a first housing for accommodating the plurality of coil groups therein, a magnet provided at an end of the shaft on the anti-load side for driving and controlling the motor, an electric drive device comprising an electronic control device for controlling the rotation of the motor, wherein the electronic control device comprises a second housing, a transistor for outputting a current for exciting the first coil group and the second coil group, and a detection circuit arranged on the axial extension line of the shaft, and a first circuit board arranged on the load side of the second housing, a second circuit board arranged on the anti-load side of the second housing and having a control circuit for controlling a power circuit having the transistor, two inter-board connectors for connecting the first circuit board and the second circuit board, a lid for accommodating the second circuit board between the second housing and covering the second housing, and includes, the first circuit board is partitioned by a power system dividing line into a first power system region where wiring for outputting a current for exciting the first coil group is arranged and a second power system region where wiring for outputting a current for exciting the second coil group is arranged, the second circuit board is partitioned by a control system dividing line into a first control system region where wiring for constituting a control circuit for controlling a current for exciting the first coil group is arranged and a second control system region where wiring for constituting a control circuit for controlling a current for exciting the second coil group is arranged, when viewed in the axial direction, the first power system region overlaps both the first control system region and the second control system region, when viewed in the axial direction, the second power system region overlaps both the first control system region and the second control system region, an electric drive device.

2. a first connector attached to the lid and for inputting and outputting a first signal from the outside, a second connector attached to the lid and for inputting and outputting a second signal from the outside, and further includes, The plurality of connection terminals of the first connector are connected to a first through-hole near a first edge of the second circuit board so as to be distributed for each system with the control system division line therebetween. The plurality of connection terminals for each system of the second connector are connected to a second through-hole near a second edge of the second circuit board so as to be distributed for each system with the control system division line therebetween. The first edge and the second edge are located at positions sandwiching a reference point on the extension line in the axial direction of the shaft. The electric drive device according to claim 1.

3. Two systems of third connectors each having a first power connector terminal and a second power connector terminal, which are attached to the lid body and to which power is input from the outside. A power supply wiring module in which a first lead frame having a first power input portion connected to an output piece of the first power connector terminal and a second lead frame having a second power input portion connected to an output piece of the second power connector terminal are molded with resin. further includes The first lead frame has a first power supply terminal of the first system and a second power supply terminal of the first system. The second lead frame has a first power supply terminal of the second system and a second power supply terminal of the second system. The second circuit board has a plurality of notches, and the first power supply terminal of the first system and the first power supply terminal of the second system pass through the notches. The first power supply terminal of the first system is connected to a third through-hole in the first power system region. The first power supply terminal of the second system is connected to a fourth through-hole in the second power system region. The second power supply terminal of the first system is connected to a fifth through-hole in the first control system region at a position adjacent to the first edge. The second power supply terminal of the second system is connected to a sixth through-hole in the second control system region at a position adjacent to the second edge. The electric drive device according to claim 2.

4. The first circuit board has a first bus bar region to which a first bus bar of the first coil group is connected and a second bus bar region to which a second bus bar of the second coil group is connected. When viewed in the axial direction, the first bus bar region is disposed on the extension line of the control system division line and outside the second edge, and the second bus bar region is disposed on the extension line of the control system division line and outside the first edge. The electric drive device according to claim 2.

5. The detection circuit has two rotation angle sensors. The reference point overlaps with the detection circuit. The detection circuit is arranged across the power system dividing line, A first terminal group exposed from one side of the detection circuit is connected to the first power system region, A second terminal group exposed from the other side of the detection circuit is connected to the second power system region, The electric drive device according to claim 4.

6. A part of the power system dividing line straddled by the detection circuit is parallel to the control system dividing line. The electric drive device according to claim 1.

7. The control circuit for controlling the current for exciting the first coil group has a first control arithmetic circuit and a first power management circuit, The control circuit for controlling the current for exciting the second coil group has a second control arithmetic circuit and a second power management circuit, When a virtual circle connecting the area center of the first control arithmetic circuit and the area center of the second control arithmetic circuit is drawn with the extension line of the shaft in the axial direction as the center, the first power management circuit and the second power management circuit are arranged at positions overlapping the virtual circle, When a virtual straight line orthogonal to the control system dividing line is drawn with the extension line of the shaft in the axial direction as the center, The first control arithmetic circuit and the first power management circuit are separated by the virtual straight line in the first control system region, The second control arithmetic circuit and the second power management circuit are separated by the virtual straight line in the second control system region. The electric drive device according to claim 1.

8. In the second circuit board, the direction in which the through holes near the first edge of the second circuit board to which power is supplied, the first power management circuit, and the first control arithmetic circuit are arranged in this order, and the direction in which the through holes near the second edge of the second circuit board to which power is supplied, the second power management circuit, and the second control arithmetic circuit are arranged in this order are opposite. The electric drive device according to claim 7.

9. An electric drive device according to any one of claims 1 to 8 is provided, The electric power steering device in which the electric drive device generates auxiliary steering torque.

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