Rotary electric machine device and electric power steering device

Abstract

A rotary electric machine device according to the present disclosure comprises: a rotary electric machine with a rotating shaft; a control unit which is disposed alongside the rotary electric machine in the axial direction along the axis of the rotating shaft and which controls the rotary electric machine; and an electromagnetic shield covering the control unit. The control unit has: a control board which extends in the axial direction and to which an external connection terminal is connected; and a filter section that attenuates a noise component propagating to the external connection terminal. The electromagnetic shield covers the entire control board and is cylindrical in shape, with a first top section having a through-hole through which the external connection terminal is inserted and a second top section located more on the rotary electric machine side than the first top section. At least a portion of the filter section is mounted on the control board and is located between the first and second top sections in the axial direction.

Description

Rotating electric machine and electric power steering device

[0001] The present disclosure relates to a rotating electric machine device and an electric power steering device.

[0002] Conventionally, there has been known a rotating electric machine device in which a rotating electric machine and a control unit are integrated. For example, the rotating electric machine and the control unit are arranged side by side in the axial direction along the axis of the rotating shaft of the rotating electric machine. The control unit has a power module that supplies current to the windings of the rotating electric machine and a control board on which a control circuit unit that controls the power module is mounted. The rotating electric machine device disclosed in Patent Document 1 employs a so-called vertical arrangement in which the power module and the control board are arranged along the axial direction. The rotating electric machine device disclosed in Patent Document 2 employs a so-called horizontal arrangement in which the power module and the control board are arranged perpendicular to the axial direction.

[0003] Japanese Patent No. 6608555 International Publication No. 2018 / 047342 International Publication No. 2021 / 192202

[0004] In rotating electrical machines, noise is generated from the control unit. The rotating electrical machine disclosed in Patent Document 3 includes a filter and an electromagnetic shield to prevent noise generated in the control unit from propagating outside the rotating electrical machine. In the configuration disclosed in Patent Document 3, a portion of the control board penetrates the electromagnetic shield and protrudes outside the electromagnetic shield, and the filter is disposed on this protrusion. In this case, the through-hole formed in the electromagnetic shield becomes large, which may cause noise generated in the control unit to leak outside through the through-hole.

[0005] In view of the above circumstances, the present disclosure aims to provide a rotating electric machine device and an electric power steering device that can suppress an increase in the size of the rotating electric machine device while suppressing the propagation of noise generated in a control unit to the outside of the rotating electric machine device.

[0006] One aspect of a rotating electric machine device according to the present disclosure comprises a rotating electric machine having a rotating shaft, a control unit arranged alongside the rotating electric machine in an axial direction along the axis of the rotating shaft and controlling the rotating electric machine, and an electromagnetic shield covering the control unit, wherein the control unit has a control board extending in the axial direction and to which external connection terminals are connected, and a filter section that attenuates noise components propagating to the external connection terminals, the electromagnetic shield covering the entire control board and being formed in a cylindrical shape having a first top having a through hole through which the external connection terminals are inserted, and a second top arranged closer to the rotating electric machine than the first top, and at least a portion of the filter section is mounted on the control board and arranged between the first top and the second top in the axial direction.

[0007] One aspect of an electric power steering device according to the present disclosure includes the rotating electric machine device.

[0008] According to the present disclosure, it is possible to provide a rotating electric machine device and an electric power steering device that can suppress an increase in the size of the rotating electric machine device while suppressing the propagation of noise generated in the control unit to the outside of the rotating electric machine device.

[0009] 10 is a circuit diagram of a rotating electric machine device according to a first embodiment. FIG. 11 is a cross-sectional view showing the configuration of the rotating electric machine device according to the first embodiment. FIG. 12 is a plan view of an electromagnetic shield according to the first embodiment. FIG. 13 is a plan view of the rotating electric machine device according to the first embodiment, showing a state in which a housing and an electromagnetic shield have been removed. FIG. 14 is a partial cross-sectional view of the rotating electric machine device according to the first embodiment. FIG. 15 is a view of a control board according to the first embodiment, viewed from a first orthogonal direction. FIG. 16 is a plan view of an electromagnetic shield according to a modified example of the first embodiment. FIG. 17 is a partial cross-sectional view of a rotating electric machine device according to a second embodiment. FIG. 18 is a partial cross-sectional view of a rotating electric machine device according to a third embodiment. FIG. 19 is a view of a control board according to a fourth embodiment, viewed from the first orthogonal direction. FIG. 19 is a partial cross-sectional view of a rotating electric machine device according to a fifth embodiment. FIG. 19 is a partial cross-sectional view of a rotating electric machine device according to a sixth embodiment. FIG. 19 is a partial cross-sectional view of a rotating electric machine device according to a seventh embodiment. FIG. 19 is a circuit diagram of a rotating electric machine device according to an eighth embodiment. FIG. 19 is a cross-sectional view showing the configuration of a rotating electric machine device according to the eighth embodiment. FIG. 19 is a view of a control board according to the eighth embodiment, viewed from the first orthogonal direction. FIG. 19 is a view of a control board according to a modified example of the eighth embodiment, viewed from the first orthogonal direction.

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the scope of the present disclosure is not limited to the following embodiments and can be modified as desired within the scope of the technical concept of the present disclosure.

[0011] Embodiment 1. Fig. 1 is a circuit diagram of a rotating electric machine device 100 according to Embodiment 1. Fig. 2 is a cross-sectional view of the rotating electric machine device 100. As shown in Figs. 1 and 2, the rotating electric machine device 100 has a control unit 1 and a rotating electric machine 2. The control unit 1 and the rotating electric machine 2 are integrated. The rotating electric machine device 100 is used, for example, in an electric power steering device mounted on a vehicle. The rotating electric machine device 100 may have a function of generating power by driving a load and using the regenerative power to charge a battery.

[0012] 1, the control unit 1 includes an inverter circuit 3, a control circuit section 4, a power supply relay switching element 5, a filter section 17, etc. A battery 6 (power source), an ignition switch 7, and sensors 8 are connected to the control unit 1. The sensors 8 include, for example, a steering angle sensor provided near the steering wheel of the vehicle to detect the steering angle, a torque sensor to detect the steering torque, a speed sensor to detect the traveling speed of the vehicle, etc.

[0013] The rotating electric machine 2 is, for example, a three-phase brushless rotating electric machine. The three phases are U-phase, V-phase, and W-phase. The rotating electric machine 2 has three-phase windings. In FIG. 1 , the three-phase windings are represented by symbols Ua, Va, and Wa. The three-phase windings Ua, Va, and Wa are delta-connected. The three-phase windings Ua, Va, and Wa may also be Y-connected. The rotating electric machine 2 may also be a two-pole, two-pair brushed rotating electric machine. The rotating electric machine 2 is provided with a rotation sensor 9 for detecting the rotation angle of a rotating shaft 21 (see FIG. 2 ) of the rotating electric machine 2.

[0014] The inverter circuit 3 includes smoothing capacitors 30U, 30V, and 30W, upper-arm switching elements 31U, 31V, and 31W, lower-arm switching elements 32U, 32V, and 32W, shunt resistors 33U, 33V, and 33W, and rotating electric machine relay switching elements 34U, 34V, and 34W, which are provided corresponding to the three-phase windings Ua, Va, and Wa, respectively. Note that the circuit configurations corresponding to the U-phase, V-phase, and W-phase in the inverter circuit 3 are similar. Therefore, the following description will be given of the U-phase as a representative of these three phases. In other words, the following description also applies to the V-phase and W-phase.

[0015] The upper arm switching element 31U is electrically connected to the positive electrode of the battery 6, and the lower arm switching element 32U is electrically connected to the negative electrode of the battery 6. The upper arm switching element 31U and the lower arm switching element 32U are connected in series. The rotary electric machine relay switching element 34U is connected between the upper arm switching element 31U and the lower arm switching element 32U. The rotary electric machine relay switching element 34U switches on and off the power supply from the portion between the upper arm switching element 31U and the lower arm switching element 32U to the winding Ua of the rotary electric machine 2. The smoothing capacitor 30U has the function of suppressing power supply voltage fluctuations and noise during switching. The shunt resistor 33U is connected between the lower arm switching element 32U and ground. The shunt resistor 33U is used to detect the current flowing through the winding Ua of the rotary electric machine 2.

[0016] The control circuit 4 controls the inverter circuit 3. The control circuit 4 includes a CPU (Central Processing Unit) 10, a drive circuit 11, an input circuit 12, a power supply circuit 13, and the like.

[0017] In response to an ignition signal from the ignition switch 7, power is supplied from the battery 6 to the power supply circuit 13. The power supply circuit 13 uses the power supplied from the battery 6 to generate a power supply voltage for normal operation of the electronic components constituting the control unit 1. The power from the battery 6 is also supplied to the inverter circuit 3 via a filter section 17 and a power relay switching element 5.

[0018] The sensors 8 are connected to the input circuit 12. Information from the sensors 8 is transmitted to the CPU 10 via the input circuit 12. Based on this information, the CPU 10 calculates and outputs control variables corresponding to the magnitude of current to be supplied to each of the three-phase windings Ua, Va, and Wa of the rotating electric machine 2. The output signal from the CPU 10 is transmitted to the drive circuit 11. The drive circuit 11 drives the inverter circuit 3 based on the calculation result of the CPU 10. Control by the drive circuit 11 is performed for each of the three phases (U phase, V phase, and W phase) of the rotating electric machine 2, and current is supplied independently from the inverter circuit 3 to each of the three-phase windings Ua, Va, and Wa.

[0019] The detection result by the rotation sensor 9 is fed back to the input circuit 12. The CPU 10 uses the rotation angle information obtained by the rotation sensor 9 to calculate the rotation angle of the rotating shaft 21 of the rotating electric machine 2, etc. Although not shown, the potential differences between both ends of the shunt resistors 33U, 33V, 33W and the voltages at the terminals of the three-phase windings Ua, Va, Wa of the rotating electric machine 2 are also fed back to the input circuit 12. Based on this information, the CPU 10 calculates the difference between the calculated value and the detected value of the current and performs feedback control.

[0020] The power supply relay switching element 5 is provided between the battery 6 and the inverter circuit 3. The power supply relay switching element 5 switches between supplying and cutting off current from the battery 6 to the inverter circuit 3 based on a drive signal from the drive circuit 11. The power supply relay switching element 5 can cut off the supply of current to the rotating electric machine 2.

[0021] The CPU 10 has an abnormality detection function that detects abnormalities in the sensors 8, the drive circuit 11, the inverter circuit 3, the three-phase windings Ua, Va, Wa, etc. of the rotating electric machine 2. When an abnormality is detected, the CPU 10 turns off the upper arm switching elements 31U, 31V, 31W, the lower arm switching elements 32U, 32V, 32W, or the rotating electric machine relay switching elements 34U, 34V, 34W of the corresponding phase in order to cut off the supply of current to the phase in which the abnormality is detected. Alternatively, the CPU 10 may turn off the power supply relay switching element 5 to cut off the supply of current to all phases.

[0022] The filter unit 17 suppresses noise generated in the inverter circuit 3. Specifically, switching noise is generated by PWM (Pulse Width Modulation) control of the inverter circuit 3. The filter unit 17 is provided to suppress transmission of this switching noise from the rotating electrical machine device 100 to the outside. A power supply line and a GND (Ground) line extending from the battery 6 are connected to the filter unit 17.

[0023] The filter unit 17 includes a normal mode coil 17a (coil) and capacitors 17b, 17c, and 17d. The normal mode coil 17a is a coil for normal mode noise. The capacitor 17b is an across-the-line capacitor or X capacitor. The capacitors 17c and 17d are line bypass capacitors or Y capacitors. The filter unit 17 is an EMI (Electromagnetic Interface) filter that suppresses conducted noise and radiated noise generated in the inverter circuit 3. A midpoint 17e between the capacitors 17c and 17d is a body ground, and is electrically connected to and grounded by the vehicle body via a part of the rotating electric machine 100. Depending on the noise generated in the rotating electric machine 100, the filter unit 17 may include a common mode coil for common mode noise, or the normal mode coil 17a may be omitted. The number of capacitors included in the filter unit 17 may be two or less, or four or more.

[0024] Next, the structure of each part of the rotating electric machine device 100 will be described with reference to FIGS. 2 to 7 . In this specification, the direction along the axis O of the rotating shaft 21 of the rotating electric machine 2 is referred to as the axial direction Z. As shown in FIG. 2 , the rotating electric machine 2 and the control unit 1 are arranged side by side in the axial direction Z and integrated. In the axial direction Z, the side on which the control unit 1 is arranged is referred to as the upper side, and the side on which the rotating electric machine 2 is arranged is referred to as the lower side. A view from the axial direction Z is referred to as a plan view. A view from the axial direction Z is referred to as a plan view. Note that the axial direction Z does not have to coincide with the vertical direction. A direction perpendicular to the axial direction Z is referred to as the first orthogonal direction X. A direction perpendicular to both the axial direction Z and the first orthogonal direction X is referred to as the second orthogonal direction Y. Along the first orthogonal direction X, the side away from the axis O of the rotating shaft 21 is referred to as the outside of the first orthogonal direction X, and the side toward the axis O of the rotating shaft 21 is referred to as the inside of the first orthogonal direction X. Along the second orthogonal direction Y, the side away from the axis O of the rotation shaft 21 is referred to as the outside of the second orthogonal direction Y, and the side toward the axis O of the rotation shaft 21 is referred to as the inside of the second orthogonal direction Y.

[0025] The rotating electric machine 2 has a rotor and a stator (not shown). The rotor and the stator are housed in a rotating electric machine case 25. The rotor is fixed to the rotating shaft 21. A plurality of permanent magnets are arranged on the outer peripheral surface of the rotor. The plurality of permanent magnets are arranged, for example, so that the polarities (south poles and north poles) on the outer peripheral surface of the rotor alternate along the circumferential direction. The stator is arranged on the outer peripheral side of the rotor with a gap therebetween. Three-phase windings Ua, Va, and Wa are wound around the stator. The three-phase windings Ua, Va, and Wa are wound in a distributed or concentrated manner around the stator. Ends (not shown) of the three-phase windings Ua, Va, and Wa extend toward the control unit 1.

[0026] Next, a description will be given of the structure of the control unit 1. The control unit 1 includes a control board 14, a power module 35, and a bus bar unit 36.

[0027] The control unit 1 is covered by a housing 40. The housing 40 covers the top and outer periphery of the control unit 1. The components that make up the control unit 1 are housed in the housing 40, which prevents damage to these components. A power connector 42 and a signal connector 43 are arranged on the top of the housing 40.

[0028] The power connector 42 has a first holding member 421 and a power connection terminal 422 (external connection terminal) extending downward from the first holding member 421. The signal connector 43 has a second holding member 431 and a signal connection terminal 432 extending downward from the second holding member 431. The first holding member 421, the second holding member 431, and the housing 40 are integrally molded from a resin material. The power connection terminal 422 and the signal connection terminal 432 are accommodated in the housing 40. The power connection terminal 422 and the signal connection terminal 432 are inserted into through holes (not shown) formed in the control board 14 and electrically connected to a circuit pattern formed on the control board 14. A relatively large current of the power supply system flows through the power connector 42, and a relatively small current of the signal system flows through the signal connector 43.

[0029] An electromagnetic shield 37 having a cylindrical shape with a top is provided inside the housing 40. The electromagnetic shield 37 covers the control board 14, the power module 35, and the bus bar unit 36. The electromagnetic shield 37 is made of metal. The electromagnetic shield 37 prevents noise generated in the control unit 1 from being emitted to the outside.

[0030] The electromagnetic shield 37 has a stepped shape. Specifically, the electromagnetic shield 37 has a first top portion 37 a, a second top portion 37 b located below the first top portion 37 a, and a connecting portion 37 c connecting the first top portion 37 a and the second top portion 37 b.

[0031] Fig. 3 is a top view of the electromagnetic shield 37. As shown in Fig. 3, the first top portion 37a has a through hole 371. The power connection terminal 422 of the power connector 42 and the signal connection terminal 432 of the signal connector 43 are inserted into the through hole 371. The second top portion 37b has a through hole 372 through which the second screw 60a (see Fig. 5) is inserted. The electromagnetic shield 37 may have a through hole or the like formed therein for positioning during assembly.

[0032] 2, the heat sink 34 is disposed inside the housing 40. The heat sink 34 has a cylindrical base 342 and a pillar 341 that protrudes upward from the center of the base 342.

[0033] The pillar portion 341 is disposed inside the electromagnetic shield 37. The pillar portion 341 extends in the axial direction Z. An end of the pillar portion 341 in the axial direction Z is fixed to the base portion 342. In other words, the pillar portion 341 is cantilevered by the base portion 342.

[0034] 4 is a plan view of the rotating electrical machine device 100, showing a state in which the housing 40 and the electromagnetic shield 37 have been removed. As shown in FIG. 4 , in a plan view, the pillar portion 341 has a rectangular shape that is long in the second orthogonal direction Y. The power module 35 is disposed on a side surface of the pillar portion 341 in the second orthogonal direction Y. The control board 14 is disposed on one side surface of the pillar portion 341 in the first orthogonal direction X. A screw fastening base 343 for fixing the control board 14 to the heat sink 34 is provided on one side surface of the pillar portion 341 in the first orthogonal direction X. The busbar unit 36 ​​is disposed on the other side surface of the pillar portion 341 in the first orthogonal direction X.

[0035] The base 342 has a large diameter portion 342a and a small diameter portion 342b that is located above the large diameter portion 342a and has a smaller diameter than the large diameter portion 342a. The rotating electric machine case 25 and the housing 40 are fixed to the outer peripheral surface of the large diameter portion 342a. The base 342 is supported by the rotating electric machine case 25. An electromagnetic shield 37 is fixed to the outer peripheral surface of the small diameter portion 342b. Insertion holes (not shown) are formed in the base 342, through which the ends of the three-phase windings Ua, Va, and Wa are inserted. Although not shown, the ends of the three-phase windings Ua, Va, and Wa extend upward through the insertion holes and are connected to the busbar unit 36.

[0036] The power module 35 is disposed vertically along a side surface of the column portion 341 in the second orthogonal direction Y. In FIG. 2 , the power module 35 is provided on the back side of the column portion 341 and is indicated by a two-dot chain line. The power module 35 includes upper arm switching elements 31U, 31V, and 31W of the inverter circuit 3, lower arm switching elements 32U, 32V, and 32W, shunt resistors 33U, 33V, and 33W, and rotating electric machine relay switching elements 34U, 34V, and 34W. As shown in FIG. 4 , a first terminal 351 connected to the control board 14 is provided at one end of the power module 35 in the first orthogonal direction X, and a second terminal 352 connected to the busbar unit 36 ​​is provided at the other end. For example, the control board 14 and the first terminal 351 are connected by soldering, and the bus bar unit 36 ​​and the second terminal 352 are connected by TIG (Tungsten Insert Gas) welding.

[0037] The busbar unit 36 ​​has a busbar base 361. The busbar base 361 has a busbar 362 and a resin busbar holder 363 in which the busbar 362 is embedded. The smoothing capacitors 30U, 30V, and 30W of the inverter circuit 3 and the normal mode coil 17a of the filter unit 17 are mounted on the busbar base 361. The busbar 362 is connected to ends of the three-phase windings Ua, Va, and Wa of the rotating electric machine 2, a second terminal 352 of the power module 35, terminals of the smoothing capacitors 30U, 30V, and 30W, a terminal of the normal mode coil 17a, and a power supply connection terminal 422 (a power supply terminal and a GND terminal) of the power supply connector 42.

[0038] The control board 14 is disposed vertically along one side surface of the column portion 341 in the first orthogonal direction X. That is, the control board 14 is disposed so as to extend in the axial direction Z and the second orthogonal direction Y. The control board 14 has a first surface 14a facing inward in the first orthogonal direction X and a second surface 14b facing outward in the first orthogonal direction X. The control circuit unit 4, the power relay switching element 5, and the capacitors 17b, 17c, and 17d of the filter unit 17 are mounted on the control board 14. Note that the control circuit unit 4 and the power relay switching element 5 are not shown in FIG. 2 . Circuit components (not shown) used to control the inverter circuit 3 are also mounted on the control board 14.

[0039] Since the current flowing through the drive circuit 11 is relatively small, the drive circuit 11 is mounted on the control board 14. However, the drive circuit 11 may also be disposed in the power module 35. Furthermore, since the current flowing through the power relay switching element 5 is relatively large, the power relay switching element 5 may also be disposed in the power module 35 rather than the control board 14.

[0040] FIG. 5 is a partial cross-sectional view showing the periphery of the upper portion 141 of the control board 14 of the rotating electrical machine device 100. As shown in FIG. 5, capacitors 17b, 17c, and 17d are arranged on the upper portion 141 of the control board 14. The capacitors 17b, 17c, and 17d are arranged between the first apex 37a and the second apex 37b in the axial direction Z. In this embodiment, the capacitors 17b, 17c, and 17d are all arranged above the second apex 37b (toward the first apex 37a). A power supply connection terminal 422 and a signal connection terminal 432 are connected to the upper portion 141. The filter unit 17 prevents noise generated in the inverter circuit 3 from leaking to the outside through the power supply connection terminal 422. In the example shown in FIG. 5, the capacitors 17b, 17c, and 17d are arranged on the second surface 14b of the control board 14. The capacitors 17 b , 17 c , and 17 d may be disposed on the first surface 14 a of the control board 14 .

[0041] A through hole 143 through which the first screw 60b is inserted is formed in the control board 14. A GND pattern 142 is formed on the second surface 14b of the control board 14 around the outer periphery of the through hole 143. The GND pattern 142 constitutes a part of a wiring pattern electrically connected to the capacitors 17b, 17c, and 17d and the power supply connection terminal 422. The GND pattern 142, together with the capacitors 17b, 17c, and 17d, constitutes the filter unit 17. Because the filter unit 17 is constituted by the GND pattern 142, it is possible to reduce costs and improve the reliability of the connection with the power supply connection terminal 422.

[0042] A grounding bus bar 38 is provided between the control board 14 and the electromagnetic shield 37. The grounding bus bar 38 electrically connects the GND pattern 142 and the electromagnetic shield 37. The grounding bus bar 38 is formed in an L-shape having a first plate portion 38a and a second plate portion 38b.

[0043] The second plate portion 38b contacts the underside of the second apex 37b. A through hole 382 through which the second screw 60a is inserted is formed in the second plate portion 38b. A fastening portion 39 into which the second screw 60a is fastened is provided on the underside of the second plate portion 38b. The fastening portion 39 is provided so as to sandwich the second plate portion 38b between itself and the second apex 37b. The fastening portion 39 is, for example, a hexagonal nut. A resin holder 61 (a resin member) is provided on the underside of the second plate portion 38b. The second plate portion 38b is supported from below by the resin holder 61. The resin holder 61 is attached to the grounding bus bar 38 by press-fitting or the like. The resin holder 61 holds the fastening portion 39 so that it cannot rotate.

[0044] The second apex 37b, the second plate 38b, and the fastened portion 39 are arranged in this order from above along the axis of the second screw 60a. In this state, the second screw 60a is inserted from above through the through hole 372 and the through hole 382 and fastened to the fastened portion 39. This secures the second plate 38b and the second apex 37b in close contact with each other, electrically connecting the second plate 38b and the second apex 37b. The axis of the second screw 60a is perpendicular to the second apex 37b. This configuration allows the electromagnetic shield 37 and the grounding bus bar 38 to be secured to each other without providing a securing part above the second screw 60a. Therefore, there is no need to ensure a distance in the axial direction Z between the electromagnetic shield 37 and the housing 40 for securing the grounding bus bar 38, thereby minimizing an increase in the size of the control unit 1 in the axial direction Z.

[0045] 7, the second top portion 37b may be provided with a cutout hole 373 that surrounds the through-hole 372. The provision of the cutout hole 373 makes the second top portion 37b more easily deformable, and the second plate portion 38b and the second top portion 37b can be more reliably fixed together.

[0046] The first plate portion 38a contacts the second surface 14b of the control board 14. The first plate portion 38a contacts the GND pattern 142 of the control board 14. A through hole 381 through which the first screw 60b is inserted is formed in the first plate portion 38a. A protrusion 61a that protrudes downward is provided in the resin holder 61. The second plate portion 38b is covered from the outside in the first orthogonal direction X by the protrusion 61a. A through hole 611 through which the first screw 60b is inserted is formed in the protrusion 61a. The outer periphery of the through hole 143 on the first surface 14a of the control board 14 is supported by a screw-fastening base 343 of the heat sink 34.

[0047] In the direction along the axis of the first screw 60b, the protrusion 61a, the first plate 38a, the control board 14, and the screw-fastening base 343 are arranged in this order facing inward in the first orthogonal direction X. In this state, the first screw 60b is inserted from the outside in the first orthogonal direction X through the through hole 611, the through hole 381, and the through hole 143 and fastened to the screw-fastening base 343. As a result, the first plate 38a and the control board 14 are fixed to the screw-fastening base 343 with the first plate 38a and the control board 14 in close contact with each other, and the first plate 38a and the GND pattern 142 are electrically connected. In addition, at this time, the axis of the first screw 60b is arranged perpendicular to the control board 14. Because the first plate portion 38a is disposed outside the control board 14 in the first orthogonal direction X and the first screw 60b is fastened from outside in the first orthogonal direction X, the grounding bus bar 38 and the control board 14 can be fixed to the heat sink 34 without providing any fixing parts above the heat sink 34, for example. Therefore, an increase in the size of the control unit 1 in the axial direction Z can be suppressed.

[0048] With the above configuration, the GND pattern 142 and the electromagnetic shield 37 are electrically connected via the grounding bus bar 38. Furthermore, when the first screw 60b is fastened to the screw fastening base 343, the first screw 60b is electrically connected to the heat sink 34. However, the electromagnetic shield 37 and the GND pattern 142 are not electrically connected to the first screw 60b and the heat sink 34. That is, the protruding portion 61a of the resin holder 61, which serves as an insulating material, is sandwiched between the head of the first screw 60b and the first plate portion 38a. Furthermore, the shank of the first screw 60b does not contact the inner surface of the through hole 381 in the first plate portion 38a or the inner surface of the through hole 143 in the control board 14. For example, resin collars, which serve as an insulating material, may be disposed on the inner surface of the through hole 381 in the first plate portion 38a and the inner surface of the through hole 143 in the control board 14. As a result, the first screw 60b is electrically insulated from the grounding bus bar 38 and the control board 14. Furthermore, the first surface 14a of the control board 14 is electrically insulated from the screw fastening base 343. Therefore, the capacitors 17b, 17c, and 17d of the filter unit 17 are grounded via the grounding bus bar 38 and the electromagnetic shield 37, without passing through the heat sink 34 to which the power module 35, which is a noise source, is attached. This allows the filter unit 17 to effectively suppress noise generated in the power module 35 (inverter circuit 3).

[0049] 6 is a view of the control board 14 as viewed from the first orthogonal direction X. In FIG. 6, the first apex 37a and the second apex 37b of the electromagnetic shield 37 are indicated by two-dot chain lines, and the second screw 60a is indicated by a dotted line.

[0050] 6 , when viewed from the first orthogonal direction X, the grounding bus bar 38 is disposed at a position overlapping the center of the control board 14 in the second orthogonal direction Y. When viewed from the first orthogonal direction X, the screws 60a and 60b are also disposed at a position overlapping the center of the control board 14 in the second orthogonal direction Y. The screws 60a and 60b are disposed so that the axis of the second screw 60a, the axis of the first screw 60b, and the axis O of the rotation shaft 21 are located on the same plane. This allows the control board 14 to be fixed to the electromagnetic shield 37 at the center in the second orthogonal direction Y using the screws 60a and 60b, thereby improving the vibration resistance and durability of the control board 14.

[0051] As described above, the rotating electric machine device 100 according to this embodiment includes the rotating electric machine 2 having the rotating shaft 21, the control unit 1 arranged alongside the rotating electric machine 2 in the axial direction Z and controlling the rotating electric machine 2, and the electromagnetic shield 37 covering the control unit 1. The control unit 1 extends in the axial direction Z and includes the control board 14 to which the power supply connection terminals 422 of the power connector 42 are connected, and the filter unit 17 that attenuates noise components propagating to the power supply connection terminals 422. The electromagnetic shield 37 covers the entire control board 14 and is formed in a cylindrical shape having a first top portion 37a having a through hole 371 through which the power supply connection terminals 422 are inserted, and a second top portion 37b arranged closer to the rotating electric machine 2 than the first top portion 37a. The capacitors 17b, 17c, and 17d of the filter unit 17 are mounted on the control board 14 and arranged between the first top portion 37a and the second top portion 37b in the axial direction Z.

[0052] Because capacitors 17b, 17c, and 17d are mounted on control board 14, an increase in size of rotating electric machine device 100 can be suppressed compared to a case in which dedicated boards and support structures are provided for mounting capacitors 17b, 17c, and 17d, thereby reducing the cost of rotating electric machine device 100. Furthermore, because capacitors 17b, 17c, and 17d are disposed between first top portion 37a and second top portion 37b in axial direction Z, capacitors 17b, 17c, and 17d can be disposed in proximity to power supply connection terminals 422, and noise components propagating to power supply connection terminals 422 can be effectively attenuated by filter unit 17. The entire control board 14 is covered by electromagnetic shield 37, and through holes 371 through which power supply connection terminals 422 are inserted are formed in first top portion 37a of electromagnetic shield 37. This allows the size of the through hole 371 to be reduced compared to, for example, a case where a portion of the control board 14 penetrates the electromagnetic shield 37 and protrudes outside the electromagnetic shield 37, thereby preventing noise generated in the control unit 1 from leaking to the outside through the through hole 371. Therefore, it is possible to prevent noise generated in the control unit 1 from propagating to the outside of the rotating electrical machine device 100. The electromagnetic shield 37 has a stepped shape having a first apex 37a and a second apex 37b. By forming the through hole 371 in the first apex 37a and using the second apex 37b to fasten the electromagnetic shield 37 to the control board 14, for example, the size of the through hole 371 in the first apex 37a can be further reduced.

[0053] The filter section 17 also has a GND pattern 142 that is formed on the control board 14 and electrically connected to the power supply connection terminal 422. The control unit 1 has a grounding bus bar 38 that electrically connects the GND pattern 142 to the electromagnetic shield 37. This allows the filter section 17 to be grounded via the grounding bus bar 38 and the electromagnetic shield 37.

[0054] The rotating electrical machine 100 further includes a heat sink 34 disposed inside the electromagnetic shield 37. The control unit 1 includes a first screw 60b that secures the ground bus bar 38 and the control board 14 to the heat sink 34 and a resin holder 61 disposed between the ground bus bar 38 and the first screw 60b. The first screw 60b secures the ground bus bar 38 and the control board 14 to the heat sink 34. The resin holder 61 is disposed between the ground bus bar 38 and the first screw 60b, providing insulation between the ground bus bar 38 and the first screw 60b. This allows the filter unit 17 to be grounded via the ground bus bar 38 and the electromagnetic shield 37, without passing through the heat sink 34 to which the power module 35, which is a noise source, is attached. This allows the filter unit 17 to more effectively attenuate noise components propagating to the power supply connection terminal 422.

[0055] Furthermore, in the direction along the axis of the first screw 60b, the resin holder 61, the grounding bus bar 38, the control board 14, and the heat sink 34 are arranged in this order toward the axis O of the rotating shaft 21. This makes it possible to easily fix the grounding bus bar 38 and the control board 14 to the heat sink 34 using the first screw 60b.

[0056] The control unit 1 also has second screws 60a that fix the grounding bus bar 38 to the second apex 37b. The second screws 60a enable the grounding bus bar 38 to be fixed to the second apex 37b.

[0057] The control unit 1 also has a fastening portion 39 to which the second screw 60a is fastened, which is disposed to sandwich the grounding bus bar 38 between the control unit 1 and the second top portion 37b. This allows the grounding bus bar 38 to be more securely fixed to the second top portion 37b.

[0058] Furthermore, the grounding bus bar 38 and the second apex 37b are arranged side by side in the axial direction Z. This allows the second screw 60a to be fastened from above in the axial direction Z, making it easier to fix the grounding bus bar 38 to the second apex 37b.

[0059] The control unit 1 also has a grounding bus bar 38, a first screw 60b that attaches the grounding bus bar 38 to the control board 14, and a second screw 60a that attaches the grounding bus bar 38 to the second top portion 37b. The axial centers of the first screw 60b and the second screw 60a are arranged on the same plane that includes the axial center O of the rotating shaft 21. This allows the control board 14 to be reliably fixed to the electromagnetic shield 37 using the screws 60a and 60b, improving the vibration resistance and durability of the control board 14.

[0060] Furthermore, the axis of the first screw 60b is disposed perpendicular to the control board 14, and the axis of the second screw 60a is disposed perpendicular to the second apex 37b. This allows the grounding bus bar 38 and the control board 14 to be securely fixed together using the first screw 60b without loosening, and the grounding bus bar 38 and the electromagnetic shield 37 to be securely fixed together using the second screw 60a without loosening. This improves the vibration resistance and durability of the control board 14.

[0061] The rotating electrical machine 100 further includes a housing 40 that houses the power supply connection terminals 422 and covers the electromagnetic shield 37. The components that make up the control unit 1 are housed in the housing 40, preventing damage to these components. Furthermore, by arranging the control board 14 and the electromagnetic shield 37 inside the housing 40, an increase in the size of the rotating electrical machine 100 can be suppressed.

[0062] Second Embodiment Next, a description will be given of a rotating electrical machine device according to a second embodiment. The basic configuration of the rotating electrical machine device according to this embodiment is similar to that of the rotating electrical machine device according to the first embodiment, and therefore differences will be mainly described.

[0063] FIG. 8 is a partial cross-sectional view of a rotating electric machine device 101 according to a second embodiment. As shown in FIG. 8 , in this embodiment, the fastened portion 39 is not provided, and the second screw 60 a is threaded into a female thread portion 383 formed in the ground bus bar 38. The female thread portion 383 is formed by performing burring and threading on the ground bus bar 38. By threading the second screw 60 a into the female thread portion 383, the electromagnetic shield 37 and the ground bus bar 38 are connected. Furthermore, a recess 612 is formed in the resin holder 61 to accommodate the tip end of the shank of the second screw 60 a. In this case, the electromagnetic shield 37 and the ground bus bar 38 can be electrically connected without providing the fastened portion 39. This reduces the cost of the rotating electric machine device 101.

[0064] Embodiment 3 Next, a description will be given of a rotating electrical machine device according to embodiment 3. The rotating electrical machine device according to this embodiment has the same basic configuration as the rotating electrical machine device according to embodiment 1, and therefore the following description will focus on the differences.

[0065] FIG. 9 is a partial cross-sectional view of a rotating electrical machine device 102 according to a third embodiment. As shown in FIG. 9 , in this embodiment, screws 60 a, 60 b are not used to fasten the ground bus bar 38, and through-holes 381, 382 are not formed in the ground bus bar 38. A through-hole 143 is not formed in the control board 14. The first plate portion 38 a is joined to the GND pattern 142 of the control board 14 by soldering. For example, the first plate portion 38 a is surface-mounted to the GND pattern 142 by reflow soldering. The second plate portion 38 b is in pressure contact with the second top portion 37 b. For example, during assembly, the second top portion 37 b may deflect the ground bus bar 38, and the lower surface of the second top portion 37 b may be in contact with the second plate portion 38 b. Alternatively, the ground bus bar 38 may be formed of an elastic member such as a leaf spring. In this case, the elastic force of the grounding bus bar 38 can cause the second plate portion 38b to abut more firmly against the second top portion 37b.

[0066] As described above, in the rotating electric machine device 102 according to this embodiment, the ground bus bar 38 is joined to the GND pattern 142 by soldering and is in pressure contact with the second apex 37b. In this case, the GND pattern 142 and the electromagnetic shield 37 can be electrically connected via the ground bus bar 38 without providing screws or the like. Therefore, the cost of the rotating electric machine device 102 can be reduced.

[0067] Furthermore, the grounding bus bar 38 is elastically deformed to be in pressure contact with the second apex 37b, thereby ensuring a more reliable electrical connection between the electromagnetic shield 37 and the grounding bus bar 38.

[0068] Embodiment 4 Next, a description will be given of a rotating electrical machine device according to embodiment 4. The rotating electrical machine device according to this embodiment has the same basic configuration as the rotating electrical machine device according to embodiment 1, and therefore the following description will focus on the differences.

[0069] 10 is a view of the control board 14 of the rotating electrical machine device 103 according to the fourth embodiment, viewed from the first orthogonal direction X. In FIG. 10, the first apex 37a and the second apex 37b of the electromagnetic shield 37 are indicated by two-dot chain lines. The second screw 60a is also indicated by a dotted line.

[0070] As shown in FIG. 10 , in this embodiment, when viewed from the first orthogonal direction X, the second screw 60a is positioned so as to overlap the center of the control board 14 in the second orthogonal direction Y, and the first screw 60b is positioned away from the center of the control board 14 in the second orthogonal direction Y. The axis of the second screw 60a is positioned on a first plane including the axis O of the rotating shaft 21, and the axis of the first screw 60b is positioned on a second plane parallel to the first plane. Even in this case, the screws 60a and 60b can be used to fix the grounding bus bar 38 to the control board 14 and the electromagnetic shield 37, and the GND pattern 142 and the electromagnetic shield 37 can be electrically connected via the grounding bus bar 38. Furthermore, adjusting the positions of the screws 60a and 60b improves design flexibility. Therefore, an increase in the size of the rotating electric machine device 103 can be suppressed, and the cost of the rotating electric machine device 103 can be reduced. In addition, when viewed from the first orthogonal direction X, the first screw 60b may be positioned at a position overlapping with the center of the control board 14 in the second orthogonal direction Y, and the second screw 60a may be positioned away from the center of the control board 14 in the second orthogonal direction Y.

[0071] Embodiment 5 Next, a rotating electrical machine device according to embodiment 5 will be described. The rotating electrical machine device according to this embodiment has the same basic configuration as the rotating electrical machine device according to embodiment 1, and therefore the following description will focus on the differences.

[0072] 11 is a partial cross-sectional view of a rotating electric machine device 104 according to Embodiment 5. As shown in FIG. 11 , in this embodiment, the normal mode coil 17a is provided on an upper portion 141 of the control board 14. That is, the capacitors 17b, 17c, and 17d and the normal mode coil 17a are mounted on the control board 14 and are disposed between the first top portion 37a and the second top portion 37b in the axial direction Z. This allows the noise to be absorbed by the electromagnetic shield 37 and then more effectively reduced by the filter unit 17.

[0073] Sixth Embodiment Next, a rotating electrical machine device according to a sixth embodiment will be described. The rotating electrical machine device according to this embodiment has the same basic configuration as the rotating electrical machine device according to the first embodiment, and therefore the following description will focus on the differences.

[0074] 12 is a partial cross-sectional view of a rotating electrical machine device 105 according to Embodiment 6. As shown in FIG. 12 , in this embodiment, capacitors 17b, 17c, and 17d are provided such that the positions of the side surfaces of capacitors 17b, 17c, and 17d coincide with the position of the upper surface (outer surface) of second top portion 37b in axial direction Z. This allows noise to be absorbed by electromagnetic shield 37 and then immediately reduced by filter unit 17.

[0075] Seventh Embodiment Next, a rotating electrical machine device according to a seventh embodiment will be described. The rotating electrical machine device according to this embodiment has the same basic configuration as the rotating electrical machine device according to the first embodiment, and therefore the following description will focus on the differences.

[0076] 13 is a partial cross-sectional view of a rotating electric machine device 106 according to a seventh embodiment. As shown in FIG. 13 , in this embodiment, capacitors 17b, 17c, and 17d are provided so as to overlap the upper surface (outer surface) of second apex 37b in the axial direction Z. That is, portions of capacitors 17b, 17c, and 17d are disposed below the upper surface of second apex 37b. In this case, too, after noise is absorbed by electromagnetic shield 37, it is possible to immediately reduce the noise by filter unit 17.

[0077] Eighth Embodiment Next, a rotating electrical machine device according to an eighth embodiment will be described. The rotating electrical machine device according to this embodiment has the same basic configuration as the rotating electrical machine device according to the first embodiment, and therefore the following description will focus on the differences.

[0078] Fig. 14 is a circuit diagram of a rotating electrical machine device 107 according to embodiment 8. Fig. 15 is a cross-sectional view of the rotating electrical machine device 107.

[0079] As shown in FIGS. 14 and 15 , in this embodiment, the rotating electric machine 2 has two sets of three-phase windings. Specifically, the rotating electric machine 2 has second three-phase windings Ub, Vb, and Wb in addition to the three-phase windings Ua, Va, and Wa. The rotating electric machine device 100 also has two sets of control units 1A and 1B. The control units 1A and 1B each have a configuration similar to that of the control unit 1 described in the first embodiment. Therefore, in this embodiment, the suffix "A" is added to the reference numerals of the components of the first control unit 1A that are the same as those of the corresponding components in the first embodiment. Furthermore, the suffix "B" is added to the reference numerals of the components of the second control unit 1B that are the same as those of the corresponding components in the first embodiment.

[0080] In the following, a description of the same structure as in embodiment 1 will be omitted, and differences will be mainly described. For example, control unit 1A includes an inverter circuit 3A, a control circuit section 4A, a power relay switching element 5A, and a filter section 17A. The configurations of inverter circuit 3A, control circuit section 4A, power relay switching element 5A, and filter section 17A are similar to the configurations of inverter circuit 3, control circuit section 4, power relay switching element 5, and filter section 17 described in embodiment 1. Control unit 1B also includes an inverter circuit 3B, a control circuit section 4B, a power relay switching element 5B, and a filter section 17B.

[0081] The first control unit 1A operates the control circuit 4A and the inverter circuit 3A based on input information from the sensors 8, the rotation sensor 9, etc., thereby driving the rotating shaft 21 via the three-phase windings Ua, Va, and Wa. The second control unit 1B operates the control circuit 4B and the inverter circuit 3B based on input information from the sensors 8, the rotation sensor 9, etc., thereby driving the rotating shaft 21 via the three-phase windings Ub, Vb, and Wb. In this way, the two control units 1A and 1B are configured to be able to drive the rotating electric machine 2 independently of each other, thereby ensuring system redundancy.

[0082] Next, the structure of each part of the rotating electrical machine device 107 will be described. As shown in Fig. 15, the control unit 1A has a control board 14A, a power module 35A, and a bus bar unit 36A. The control unit 1B has a control board 14B, a power module 35B, and a bus bar unit 36B.

[0083] The control units 1A and 1B are covered by a housing 40. A power connector 42A and a signal connector 43A connected to the control unit 1A, and a power connector 42B and a signal connector 43B connected to the control unit 1B are arranged on the upper part of the housing 40. The power connector 42A has a first holding member 421A and a power connection terminal 422A (external connection terminal) extending downward from the first holding member 421A. The signal connector 43A has a second holding member 431A and a signal connection terminal 432A extending downward from the second holding member 431A. The power connector 42B has a third holding member 421B and a power connection terminal 422B (external connection terminal) extending downward from the third holding member 421B. The signal connector 43B has a fourth holding member 431B and a signal connection terminal 432B extending downward from the fourth holding member 431B. The first holding member 421A, the second holding member 431A, the third holding member 421B, the fourth holding member 431B, and the housing 40 are integrally molded from a resin material. The power supply connection terminal 422A, the signal connection terminal 432A, the power supply connection terminal 422B, and the signal connection terminal 432B are accommodated in the housing 40.

[0084] An electromagnetic shield 37 that covers the control units 1A and 1B is provided inside the housing 40. In this embodiment, the electromagnetic shield 37 has a first top portion 37a, two second top portions 37b located below the first top portion 37a, and two connection portions 37c that connect the first top portion 37a to the two second top portions 37b, respectively. A power supply connection terminal 422A, a signal connection terminal 432A, a power supply connection terminal 422B, and a signal connection terminal 432B are inserted into through holes 371 formed in the first top portion 37a.

[0085] A heat sink 34 is disposed inside the housing 40. A power module 35A is disposed on one side surface of a pillar portion 341 of the heat sink 34 in the second orthogonal direction Y. A power module 35B is disposed on the other side surface of the pillar portion 341 in the second orthogonal direction Y. That is, the power modules 35A and 35B are disposed in the second orthogonal direction Y with the pillar portion 341 sandwiched therebetween. Note that in FIG. 15 , the positions at which the power modules 35A and 35B are disposed are indicated by two-dot chain lines. Also, although not shown, a first terminal connected to the control board 14A is provided at one end of the power module 35A in the first orthogonal direction X, and a second terminal connected to the bus bar unit 36A is provided at the other end. A first terminal connected to the control board 14B is provided at one end of the power module 35B in the first orthogonal direction X, and a second terminal connected to the bus bar unit 36B is provided at the other end.

[0086] The control board 14A is arranged on one side surface of the pillar portion 341 in the first orthogonal direction X. The control board 14B is arranged on the other side surface of the pillar portion 341 in the first orthogonal direction X. In other words, the control boards 14A and 14B are arranged with the pillar portion 341 sandwiched between them in the first orthogonal direction X.

[0087] The capacitors 17b, 17c, and 17d of the filter unit 17A are disposed on the upper portion 141A of the control board 14A. The capacitors 17b, 17c, and 17d of the filter unit 17A are disposed between the first top portion 37a and the second top portion 37b in the axial direction Z. The capacitors 17b, 17c, and 17d of the filter unit 17B are disposed on the upper portion 141B of the control board 14B. The capacitors 17b, 17c, and 17d of the filter unit 17B are disposed between the first top portion 37a and the second top portion 37b in the axial direction Z.

[0088] A ground bus bar 38A is provided between the control board 14A and the electromagnetic shield 37. The ground bus bar 38A electrically connects the GND pattern 142A of the control board 14A to the electromagnetic shield 37. As in the first embodiment, the ground bus bar 38A is attached to the control board 14A with a first screw 60b and is attached to one of the two second apexes 37b with a second screw 60a. The ground bus bar 38A may be fixed in the same manner as in the second and third embodiments.

[0089] A ground bus bar 38B is provided between the control board 14B and the electromagnetic shield 37. The ground bus bar 38B electrically connects the GND pattern 142B of the control board 14B to the electromagnetic shield 37. As in the first embodiment, the ground bus bar 38B is attached to the control board 14B with a first screw 60b and is attached to the other of the two second apexes 37b with a second screw 60a. The ground bus bar 38B may be fixed in the same manner as in the second and third embodiments.

[0090] The busbar unit 36A is disposed outward of the control board 14A in the first orthogonal direction X. A busbar base 361A of the busbar unit 36A is disposed parallel to the control board 14A. The busbar unit 36B is disposed outward of the control board 14B in the first orthogonal direction X. A busbar base 361B of the busbar unit 36B is disposed parallel to the control board 14B.

[0091] FIG. 16 is a view of the control board 14A as viewed from the first orthogonal direction X. In FIG. 16 , the first apex 37a and the second apex 37b of the electromagnetic shield 37 are indicated by two-dot chain lines. The second screw 60a is indicated by a dotted line, and the busbar unit 36A is indicated by a dashed line. As shown in FIG. 16 , the busbar unit 36A is positioned to overlap the control board 14A when viewed from the first orthogonal direction X. The busbar unit 36A is positioned apart from the connection portion between the grounding busbar 38A and the control board 14A (i.e., the first screw 60b) in the first orthogonal direction X, and is positioned apart from the connection portion between the grounding busbar 38A and the electromagnetic shield 37 (i.e., the second screw 60a) in the axial direction Z. Similarly, the busbar unit 36B is positioned to overlap the control board 14B when viewed from the first orthogonal direction X. The bus bar unit 36B is disposed at a distance in the first orthogonal direction X from the connection portion between the grounding bus bar 38B and the control board 14B, and at a distance in the axial direction Z from the connection portion between the grounding bus bar 38B and the electromagnetic shield 37. This prevents the bus bar units 36A, 36B from contacting the connection portions between the grounding bus bars 38A, 38B and the control boards 14A, 14B, and the connection portions between the grounding bus bars 38A, 38B and the electromagnetic shield 37, and allows the bus bar units 36A, 36B to be efficiently disposed inside the electromagnetic shield 37.

[0092] 16, the screws 60a, 60b are arranged so that the axis of the second screw 60a, the axis of the first screw 60b, and the axis O of the rotation shaft 21 are located on the same plane. This allows the control boards 14A, 14B to be fixed to the electromagnetic shield 37 at the center in the second orthogonal direction Y using the screws 60a, 60b, thereby improving the vibration resistance and durability of the control boards 14A, 14B.

[0093] As shown in FIG. 17 , the connection portion between the ground bus bar 38A and the control board 14A (i.e., the first screw 60b) and the connection portion between the ground bus bar 38A and the electromagnetic shield 37 (i.e., the second screw 60a) may be positioned at different positions in the second orthogonal direction Y. Similarly, the connection portion between the ground bus bar 38B and the control board 14B and the connection portion between the ground bus bar 38B and the electromagnetic shield 37 may be positioned at different positions in the second orthogonal direction Y. Even in this case, the bus bar units 36A and 36B are positioned away from the connection portions between the ground bus bars 38A and 38B and the control boards 14A and 14B, and the connection portions between the ground bus bars 38A and 38B and the electromagnetic shield 37. This prevents the bus bar units 36A and 36B from coming into contact with these connection portions. Adjusting the positions of the screws 60a and 60b as described above also improves design flexibility. Therefore, the busbar units 36A and 36B can be arranged more efficiently inside the electromagnetic shield 37, and an increase in the size of the rotating electrical machine 107 can be suppressed.

[0094] Ninth Embodiment The rotating electric machine devices according to the first to eighth embodiments can be applied to an electric power steering device for a vehicle. An electric power steering device 150 according to the ninth embodiment will be described below with reference to FIG. 18. Note that components having the same functions and actions as those in the first embodiment will be given the same reference numerals and their description will be omitted.

[0095] 18 is a schematic configuration diagram of an electric power steering device 150 according to embodiment 9. In the illustrated example, the electric power steering device 150 is a rack-type electric power steering device. The electric power steering device 150 includes the rotating electrical machine 100, a steering wheel 151, a torque sensor 152, and a speed sensor 153.

[0096] When the driver operates the steering wheel 151 to generate a steering torque in the steering mechanism of the vehicle, the torque sensor 152 detects the steering torque and outputs it to the rotary electric machine device 100. The speed sensor 153 detects the traveling speed of the vehicle and outputs it to the rotary electric machine device 100. The rotary electric machine device 100 generates an assist torque that assists the steering torque based on inputs from the torque sensor 152 and the speed sensor 153, and transmits it to the steering mechanism of the front wheels 154 of the vehicle. The torque sensor 152 and the speed sensor 153 are part of the sensors 8 in FIG. 1 . The rotary electric machine device 100 may generate an assist torque based on information other than that from the torque sensor 152 and the speed sensor 153.

[0097] By reducing the size of the rotating electric machine device 100 applied to the electric power steering device 150, it is possible to improve the ease of mounting it on a vehicle. By reducing the cost of the rotating electric machine device 100, it is possible to reduce the cost of the entire electric power steering device 150. The same applies when the rotating electric machine devices 101 to 107 are used instead of the rotating electric machine device 100.

[0098] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure.

[0099] For example, the rotating electrical machine device 100 may be used for purposes other than the electric power steering device 150. In addition, the above-described embodiments and modifications may be combined as appropriate.

[0100] DESCRIPTION OF SYMBOLS 1, 1A, 1B...Control unit 2...Rotating electric machine 17, 17A, 17B...Filter section 17a...Normal mode coil (coil) 17b, 17c, 17d...Capacitor 21...Rotating shaft 34...Heat sink 36, 36A, 36B...Bus bar unit 37...Electromagnetic shield 37a...First top portion 37b...Second top portion 38, 38A, 38B...Grounding bus bar 39...Fastened portion 40...Housing 60a...Second screw 60b...First screw 61...Resin holder (resin member) 100, 101, 102, 103, 104, 105, 106, 107...Rotating electric machine device 142, 142A, 142B...GND pattern (wiring pattern) 150...Electric power steering device 361, 361A, 361B... Busbar base 422, 422A, 422B... Power supply connection terminal (external connection terminal) O... Shaft center

Claims

1. A rotating electrical machine having a rotating shaft, A control unit that is arranged side by side with the rotating electrical machine in the axial direction along the axis of the rotating shaft and controls the rotating electrical machine, An electromagnetic shield that covers the control unit, Comprising, The control unit, A control board that extends in the axial direction and to which external connection terminals are connected, A filter unit that attenuates noise components propagating to the external connection terminals, Having, The electromagnetic shield is formed in a cylindrical shape having a first top portion that covers the entire control board and has a through hole through which the external connection terminal is inserted, and a second top portion that is arranged closer to the rotating electrical machine side than the first top portion, At least a part of the filter unit is mounted on the control board and is arranged between the first top portion and the second top portion in the axial direction, Rotating electrical machine device.

2. The filter unit is formed on the control board and has a wiring pattern that is electrically connected to the external connection terminal, The control unit has a grounding bus bar that electrically connects the wiring pattern and the electromagnetic shield, The rotating electrical machine device according to claim 1.

3. Further comprising a heat sink arranged inside the electromagnetic shield, The control unit, A first screw that fixes the grounding bus bar and the control board to the heat sink, A resin member arranged between the grounding bus bar and the first screw, Having, The rotating electrical machine device according to claim 2.

4. In the direction along the axis of the first screw, the resin member, the grounding bus bar, the control board, and the heat sink are arranged in this order toward the axis of the rotating shaft, The rotating electrical machine device according to claim 3.

5. The control unit has a second screw that fixes the grounding bus bar to the second top portion, The rotating electrical machine device according to claim 2.

6. The control unit is provided so as to sandwich the grounding bus bar between it and the second top portion, and has a fastened portion to which the second screw is fastened, The rotating electrical machine device according to claim 5.

7. The grounding bus bar and the second top portion are arranged side by side in the axial direction, The rotating electrical machine device according to claim 5.

8. The grounding bus bar is joined to the wiring pattern by soldering and is in pressing contact with the second top portion, The rotating electrical machine device according to claim 2.

9. The grounding bus bar is in pressing contact with the second top portion by elastically deforming. The rotating electrical machine device according to claim 8.

10. The control unit a grounding bus bar, a first screw for attaching the grounding bus bar to the control board, a second screw for attaching the grounding bus bar to the second top portion, and has the axis of the first screw and the axis of the second screw are arranged on the same plane including the axis of the rotating shaft. The rotating electrical machine device according to claim 1.

11. The control unit a grounding bus bar, a first screw for attaching the grounding bus bar to the control board, a second screw for attaching the grounding bus bar to the second top portion, and has the axis of the second screw is arranged on a first plane including the axis of the rotating shaft, and the axis of the first screw is arranged on a second plane parallel to the first plane. The rotating electrical machine device according to claim 1.

12. The axis of the first screw is arranged perpendicular to the control board, and the axis of the second screw is arranged perpendicular to the second top portion. The rotating electrical machine device according to claim 10.

13. The control unit has a bus bar base portion that is arranged in parallel with the control board and on which a part of the filter portion is mounted. The bus bar base portion is arranged at a distance from the connection portion between the grounding bus bar and the control board. The rotating electrical machine device according to claim 2.

14. Further provided with a housing that houses the external connection terminal and covers the electromagnetic shield. The rotating electrical machine device according to claim 1.

15. The filter portion includes a capacitor. The capacitor is mounted on the control board and is arranged between the first top portion and the second top portion in the axial direction. The rotating electrical machine device according to claim 1.

16. The filter portion includes a capacitor and a coil. The capacitor and the coil are mounted on the control board and are arranged between the first top portion and the second top portion in the axial direction. The rotating electrical machine device according to claim 1.

17. The capacitor is provided such that the entire capacitor is arranged on the first top portion side rather than the second top portion. The rotating electrical machine device according to claim 15.

18. The capacitor is provided such that, in the axial direction, the position of the side surface of the capacitor coincides with the position of the outer surface of the second top portion. The rotating electrical machine device according to claim 15.

19. The capacitor is provided so as to overlap the outer surface of the second top portion in the axial direction. The rotating electrical machine device according to claim 15.

20. An electric power steering device including the rotating electrical machine device according to any one of claims 1 to 19.