Rotating electrical machine device and electric power steering device

Abstract

The rotating electric machine device (100) according to the present application has the following structure: The power module (4) that supplies power to the winding (30) and the extension of the control substrate (19) on which its drive circuit (17) is mounted are connected to the connectors (1), (9) through the external connection opening (12) of the electromagnetic shield (3). A filter circuit (11) is mounted on the extension of the control substrate (19) to ensure noise removal ability. There is no need for an existing dedicated wiring substrate for mounting the filter circuit (11), so it helps to miniaturize and reduce costs. It can contribute to the miniaturization and cost reduction of the electric power steering device (150) equipped with the rotating electric machine device (100) according to the present application.

Description

Technical Field

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

[0002] In the existing rotating electrical machine device in which a control unit is integrated adjacent to the axial direction of the output shaft of the rotating electrical machine, there is a structure in which a stator, a rotor, etc. are built into a housing of the rotating electrical machine, and the control unit is assembled adjacent to the housing in a stacked manner. In addition, in consideration of redundancy, there is also a device disclosed in which the rotating electrical machine has two winding groups and the so-called inverter circuits driving them are also independently provided with two groups (for example, Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 5435284 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] In a rotating electric machine device for an electric power steering device in which a rotating electric machine and a control unit are integrated adjacent to the axial direction of the output shaft of the rotating electric machine, voltage noise is generated from an inverter, an inverter drive circuit, etc. for driving the rotating electric machine. The generated voltage noise propagates through the power supply, signal terminal, and substrate of the rotating electric machine device, and propagates from the connector to the outside of the rotating electric machine device. Alternatively, the generated voltage noise propagates through the heat sink and the housing of the rotating electric machine, and propagates to the outside of the rotating electric machine device through the flange of the rotating electric machine. Therefore, in order to prevent the noise from propagating to the outside of the rotating electric machine device, a filter circuit and an electromagnetic shielding member that attenuate the noise are required.

[0008] In order to shorten the wiring of the power module such as the inverter for driving the rotating motor and the drive circuit for driving the power module, it is preferred to arrange them near the rotating motor. Therefore, the power module and the control substrate on which the drive circuit for driving the power module is installed are arranged adjacent to each other. In addition, in order to prevent the noise from being superimposed on the wiring after the noise is attenuated, the filter circuit needs to be arranged near the opening of the shield. Therefore, the filter circuit needs to be configured with a dedicated wiring substrate near the opening of the shield, and the dedicated wiring substrate is installed with the filter circuit separate from the control substrate on which the inverter drive circuit is installed. The provision of this dedicated wiring substrate becomes an obstacle to the miniaturization and low cost of the rotating motor device. Therefore, it becomes an obstacle to the miniaturization and low cost of the electric power steering device equipped with the rotating motor device.

[0009] Therefore, the object of the rotating electrical machine device involved in the present application is to obtain a rotating electrical machine device and an electric power steering device including the rotating electrical machine device, which do not require a dedicated wiring board for mounting a filter circuit and include a filter circuit with high noise removal ability.

[0010] Technical means for solving technical problems

[0011] The rotating electrical machine device involved in the present application includes:

[0012] A rotating electrical machine having a rotating shaft and a winding;

[0013] A power module disposed on one side in the axial direction of the rotating shaft with respect to the rotating electrical machine and fixed to the rotating electrical machine, for supplying power to the winding of the rotating electrical machine;

[0014] A control board on which a drive circuit for driving the power module is mounted and having an extension extending toward one side in the axial direction of the rotating shaft;

[0015] An electromagnetic shielding member surrounding the power module and the drive circuit and having an external connection opening through which the extension of the control board passes;

[0016] External connection terminals disposed outside the electromagnetic shielding member and connected to the extension of the control board; and

[0017] A filter circuit mounted on the extension of the control board for attenuating noise components propagating to the external connection terminals.

[0018] The electric power steering device involved in the present application includes the above-mentioned rotating electrical machine device.

[0019] Advantages of the invention

[0020] According to the rotating electrical machine device and the electric power steering device involved in the present application, a dedicated wiring board for mounting a filter circuit is not required, and a filter circuit with noise removal ability can be provided near the external connection opening of the electromagnetic shielding member. Thus, the dedicated wiring board for mounting the filter circuit can be eliminated, which contributes to miniaturization and cost reduction. Therefore, it can contribute to the miniaturization and cost reduction of the electric power steering device including the rotating electrical machine device involved in the present application. Brief description of the drawings

[0021] Figure 1 It is an overall structure diagram of the rotating electrical machine device according to Embodiment 1.

[0022] Figure 2 It is a circuit diagram of the rotating electrical machine device according to Embodiment 1.

[0023] Figure 3 It is an overall structural diagram of the rotating electrical machine device according to Embodiment 2.

[0024] Figure 4 It is a circuit diagram of the rotating electrical machine device according to Embodiment 2.

[0025] Figure 5 It is a structural diagram of the electric power steering device according to Embodiment 3.

[0026] Figure 6 It is an overall structural diagram of an existing rotating electrical machine device. Detailed Embodiments

[0027] Hereinafter, embodiments of the present application will be described with reference to the drawings.

[0028] 1. Embodiment 1

[0029] Embodiment 1 will be described. Figure 1 It is an overall structural diagram of the rotating electrical machine device 100 in Embodiment 1. Figure 2 It is a circuit diagram of the rotating electrical machine device 100 according to Embodiment 1.

[0030] <Overall Structure>

[0031] Figure 1 It is a cross-sectional view for explaining the overall structure of the rotating electrical machine device 100. A power terminal 2 is built in a power connector 1 for supplying power from a vehicle battery to the rotating electrical machine device 100, and current is supplied to a power module 4. In addition, a signal terminal 10 is built in a signal connector 9 for performing signal exchange with the vehicle, and is connected to a control board 19. In addition, the power terminal 2 is also connected to the control board 19, and power supply current is supplied to a power circuit 15 mounted on the control board. The rotating electrical machine device 100 can be a device of an integrated control circuit type of a three-phase brushless motor with Y connection or Δ connection, and can also have a function of generating electricity by driving a load and using the regenerative power for battery charging. The rotating electrical machine device 100 is used not only for the electric power steering device 150, but also for various uses including driving of vehicle wheels.

[0032] Here, the control substrate 19 is a printed wiring board, on which a power supply circuit 15, an input / output circuit 14, a CPU 16, a drive circuit 17, and a filter circuit 11 are mounted. A power supply current is supplied from a power supply terminal 2 connected to the control substrate 19, and the power supply circuit 15 supplies a current of a constant voltage to each circuit mounted on the control substrate 19. Information of the vehicle such as steering angle information, steering torque information, and vehicle speed information is supplied from a vehicle sensor 31 via a signal terminal 10. The input signal is transmitted to the CPU 16 via the input / output circuit 14. The CPU 16 calculates the information to be output based on the input information and controls the drive circuit 17. The output signal of the drive circuit 17 is transmitted from a drive signal terminal 18 connected to the control substrate 19 to a power module 4, and the power module 4 supplies power to a winding 30 of a rotating electric machine 20 via a power supply terminal 6.

[0033] When driving the rotating electric machine device 100, noise is generated from the power module 4 and the drive circuit 17 that drives the power module 4. To reduce this noise, an electromagnetic shielding member 3 is provided. In the bottomed cylindrical electromagnetic shielding member 3, a cylindrical peripheral portion is connected to the rotating electric machine 20 and surrounds the power module 4 and the drive circuit 17 that drives the power module 4. An externally connecting opening 12 is provided at the bottom of the electromagnetic shielding member 3.

[0034] The control substrate 19 has an extending portion that extends on the side opposite to the output shaft 21 of the rotating electric machine 20. The extending portion of the control substrate 19 is connected to the power supply terminal 2 and the signal terminal 10 through the externally connecting opening 12 of the electromagnetic shielding member 3. A filter circuit 11 is installed before the connecting portion between the control substrate 19 and the power supply terminal 2 and the signal terminal 10 to cut off the transmission of noise to the outside.

[0035] In addition, the power module 4 is cooled by a radiator 7. The power module 4 and the radiator 7 are in close contact via a mica sheet or the like, ensuring heat conduction while being electrically insulated. The radiator 7 is electrically connected to the rotating electric machine 20 and has the same potential.

[0036] The control unit of the rotating electric machine 20 mainly composed of the control substrate 19, various circuits and components mounted on the control substrate 19, the power module 4, and the radiator 7 is covered by a frame 5 of the rotating electric machine 20 and is connected to the outside through a power connector 1 and a signal connector 9. The rotating electric machine 20 is provided with a flange 8, and the rotating electric machine device 100 is assembled to the vehicle through the flange 8.

[0037] <Existing Example>

[0038] Here, an existing noise countermeasure is involved. Figure 6 It is an overall structure diagram of an existing rotating electric machine device 102.

[0039] Previously, through Figure 6Implement noise countermeasures with such a structure. In order to reduce the noise propagated from the power supply terminal 2 to the outside of the rotating electrical machine device 102 via the power connector 1, a filter circuit mounting substrate 22 is required, and the filter circuit mounting substrate 22 mounts a filter circuit 11 separate from the control substrate 19.

[0040] In addition, the filter circuit 11 for reducing the noise propagated from the signal terminal 10 to the outside of the rotating electrical machine device 102 via the signal connector 9 is mounted on the control substrate 19, and it is difficult to be arranged near the external connection opening 12 of the electromagnetic shielding member 3. Therefore, magnetic noise and the like overlap on the signal terminal 10 after the noise is attenuated by the filter circuit 11, and the noise cannot be sufficiently attenuated.

[0041] <Propagation mechanism of noise>

[0042] The propagation mechanism of the noise generated from the rotating electrical machine device 100 will be described. The main noise source of the rotating electrical machine device 100 is the power module 4 for driving the rotating electrical machine 20.

[0043] Figure 1 In this case, the power supply supplied to the power connector 1 from the outside of the rotating electrical machine device 100 is supplied to the power module 4 via the power supply terminal 2. The signal related to the information of the vehicle transmitted from the vehicle sensor 31 via the signal connector 9 is transmitted to the CPU 16 via the input / output circuit 14. The CPU 16 that calculates and outputs according to the input information controls the drive circuit 17, and the drive signal of the drive circuit 17 is transmitted to the power module 4 via the drive signal terminal 18, and the power module 4 supplies current to the rotating electrical machine 20 according to the inverter drive signal. When driving the rotating electrical machine 20, the power supply voltage supplied to the power module 4 changes, and the changes in voltage and current generated by the change in the supply current to the rotating electrical machine 20 become voltage noise and magnetic noise respectively and propagate to the periphery.

[0044] The voltage noise propagates from the power connector 1 and the signal connector 9 to the outside of the rotating electrical machine device 100 via the power supply terminal 2, the signal terminal 10, the control substrate 19, etc. In addition, the voltage noise propagated from the power supply terminal 6 propagates from the flange 8 of the mounting portion of the rotating electrical machine device 100 to the outside of the rotating electrical machine device 100 via the rotating electrical machine 20. In addition, since the power module 4 is mounted on the radiator 7 for heat dissipation, the voltage noise propagated from the power module 4 to the radiator 7 due to capacitive coupling propagates from the flange 8 of the motor mounting portion to the outside of the rotating electrical machine device 100 via the rotating electrical machine 20.

[0045] Magnetic noise generated by the supply current of the rotating electric machine 20 is released to the periphery of the power module 4. Noise generated in the drive circuit 17, the CPU 16, and the power supply circuit 15, which are noise sources other than the power module 4, is propagated from the signal terminal 10 and the control substrate 19 through the signal connector 9 to the outside of the rotating electric machine device 100.

[0046] <Reduction of Noise>

[0047] The rotating electric machine device 100 according to the present application includes a rotating electric machine 20 having an output shaft 21 and a winding 30. Further, the rotating electric machine device 100 includes a power module 4 that is disposed on the anti-output side in the axial direction of the output shaft 21 with respect to the rotating electric machine 20 and is fixed to the rotating electric machine 20 to supply power to the winding 30 of the rotating electric machine 20. Further, the rotating electric machine device 100 includes a control substrate 19 on which a drive circuit 17 for driving the power module 4 is mounted and which has an extension portion extending toward the anti-output side in the axial direction of the output shaft 21. And, the rotating electric machine device 100 includes an electromagnetic shielding member 3 that surrounds the power module 4 and the drive circuit 17 and has an external connection opening 12 through which the extension portion of the control substrate 19 passes. Then, the rotating electric machine device 100 includes a power supply terminal 2 and a signal terminal 10 that are disposed outside the electromagnetic shielding member 3 and are connected to the extension portion of the control substrate 19. Further, the rotating electric machine device 100 includes a filter circuit 11 that is mounted on the extension portion of the control substrate 19 and attenuates noise components propagated to the power supply terminal 2 and the signal terminal 10.

[0048] The filter circuit 11 is installed to attenuate voltage noise propagated to the outside of the rotating electric machine device 100 via the power supply connector 1, the signal connector 9, and the rotating electric machine 20. The generation and propagation of the generated noise can be reduced from being released to the outside of the rotating electric machine device 100.

[0049] Thus, by providing the electromagnetic shielding member 3, the control substrate 19, and the filter circuit 11, noise can be effectively removed without using another substrate for the filter circuit.

[0050] Further, the rotating electric machine device 100 according to the present application includes a radiator 7 that is located between the power module 4 and the rotating electric machine 20, performs heat transfer with the power module 4, and is at the same potential as the rotating electric machine 20. Then, the electromagnetic shielding member 3 has a bottomed cylindrical shape, and the cylindrical peripheral portion is connected to the rotating electric machine 20, and the bottom has an external connection opening 12.

[0051] Since the electromagnetic shielding member 3 is connected to the rotating electric machine 20, noise radiation from the electromagnetic shielding member 3 can be reduced, and a high shielding effect can be obtained.

[0052] In addition, in the rotating electrical machine device 100 according to the present application, the cylindrical peripheral portion of the electromagnetic shielding member 3 is connected to the rotating electrical machine 20 or the radiator 7 at a portion closer to the output direction of the output shaft 21 than the heat transfer portion between the radiator 7 and the power module 4.

[0053] The mounting position of the electromagnetic shielding member 3 with respect to the power module 4 and the radiator 7 is connected to the radiator 7 or the rotating electrical machine 20 at the same potential as the rotating electrical machine 20 at a position closer to the rotating electrical machine 20. The noise propagated from the power module 4 to the radiator 7 does not flow through the electromagnetic shielding member 3. Therefore, a stable potential regeneration path can be obtained, and a high filtering effect can be obtained.

[0054] In addition, in the rotating electrical machine device 100 according to the present application, the power supply terminal 2 and the signal terminal 10 are connected to the extension portion of the control substrate 19 at a position closer to the outside than the external connection opening 12 of the electromagnetic shielding member 3.

[0055] The electromagnetic shielding 3 is arranged to reduce the influence of the magnetic noise released from the power module 4 on the power supply terminal 2, the signal terminal 10, and the control substrate 19, which are located closer to the power supply connector 1 and the signal connector 9 than the filter circuit 11 inside the rotating electrical machine device 100, and to reduce the influence on the outside of the rotating electrical machine device 100.

[0056] Thereby, noise can be effectively removed.

[0057] 2. Embodiment 2

[0058] Embodiment 2 will be described. Figure 3 FIG. is an overall structural diagram of a rotating electrical machine device 101 according to Embodiment 2. Figure 4 FIG. is a circuit diagram of a rotating electrical machine device 101 according to Embodiment 2.

[0059] The circuit diagram of the rotating electrical machine device 101 according to Embodiment 2 Figure 4 Compared with the circuit diagram of the rotating electrical machine device 100 according to Embodiment 1 Figure 2 The difference is only that one end of the relay member 13 is connected to the electromagnetic shielding member 3, and the other end is connected to the ground portion of the control substrate 19.

[0060] The structural diagram of the rotating electrical machine device 101 according to Embodiment 2 Figure 3 Compared with the structural diagram of the rotating electrical machine device 100 according to Embodiment 1 Figure 1 There are differences in the following three points.

[0061] (1) The relay member 13 is connected near the external connection opening 12 of the electromagnetic shielding member 3 and the filter circuit 11 of the extension portion of the control substrate 19.

[0062] (2) The filter circuit 11 is disposed at the position of the external connection opening 12 of the extension portion of the control substrate 19 passing through the electromagnetic shielding member 3.

[0063] (3) The cylindrical peripheral portion of the bottomed cylindrical electromagnetic shielding member 3 is connected to the radiator 7, and is not directly connected to the rotating electric machine 20.

[0064] <Reduction of Noise in Embodiment 2>

[0065] In the rotating electric machine device 101 according to the present application, the filter circuit is mounted at the position of the external connection opening 12 of the extension portion of the control substrate 19 passing through the electromagnetic shielding member 3.

[0066] The filter circuit 11 is mounted to attenuate voltage noise propagated to the outside of the rotating electric machine device 101 via the power connector 1, the signal connector 9, and the rotating electric machine 20. Further, the filter circuit 11 is mounted near the external connection opening 12 of the control substrate 19 that is arranged in parallel with the output shaft 21 and extended closer to the power connector 1 and the signal connector 9 with respect to the external connection opening 12. Thus, magnetic noise does not overlap with the control substrate 19, the power terminal 2, and the signal terminal 10 on the side of the power connector 1 and the signal connector 9 where the filter circuit 11 after attenuating the noise is disposed. The front and rear of the filter circuit 11 and the inside and outside of the external connection opening 12 can be separated by the filter circuit 11 and the electromagnetic shielding member 3. Therefore, a high filtering effect can be obtained.

[0067] In the rotating electric machine device 101 according to the present application, the filter circuit 11 is connected to the electromagnetic shielding member 3 via the relay member 13.

[0068] By electrically connecting the filter circuit 11 and the electromagnetic shielding member 3 using the relay member 13, the relay member 13 operates as a path for regenerating voltage noise propagated from the power module 4 via the radiator 7, the rotating electric machine 20, and the flange 8 to the outside of the rotating electric machine device 101, or voltage noise propagated from the power supply terminal 6 via the rotating electric machine 20 and the flange 8 to the outside of the rotating electric machine device 101 to the filter circuit 11.

[0069] Thereby, noise transmission to the outside can be suppressed.

[0070] In the rotating electric machine device 101 according to the present application, the relay member 13 is connected to the external connection opening 12 of the electromagnetic shielding member 3.

[0071] The relay member 13 is used to electrically connect the filter circuit 11 and the electromagnetic shielding member 3 by the shortest path. Thus, the relay member 13 operates efficiently as the shortest path for regenerating the voltage noise propagated to the outside of the rotating electric machine device 101 to the filter circuit 11.

[0072] Thus, the transmission of noise to the outside can be effectively suppressed.

[0073] In the rotating electric machine device 101 according to the present application, the potential of the electromagnetic shielding member 3 is used as the ground potential of the filter circuit 11.

[0074] The filter circuit 11 and the electromagnetic shielding member 3 are electrically connected by using the relay member 13. Thus, the electromagnetic shielding member 3 can be used as the ground potential of the filter circuit 11. Thus, the relay member 13 operates as a path for regenerating the voltage noise propagated from the power module 4 via the radiator 7, the rotating electric machine 20, and the flange 8 to the outside of the rotating electric machine device 101, or the voltage noise propagated from the power supply terminal 6 via the rotating electric machine 20 and the flange 8 to the outside of the rotating electric machine device 101 to the filter circuit 11.

[0075] Thus, the transmission of noise to the outside can be suppressed more effectively.

[0076] In addition, even when the cylindrical peripheral portion of the bottomed cylindrical electromagnetic shielding member 3 is connected to the radiator 7 and not directly connected to the rotating electric machine 20, since the radiator 7 is electrically connected to the rotating electric machine 20 and maintained at the same potential, the same effect as the case where the cylindrical peripheral portion of the electromagnetic shielding member 3 is directly connected to the rotating electric machine 20 can be obtained.

[0077] 3. Embodiment 3

[0078] Figure 5 It is a structural diagram of the electric power steering device 150 according to Embodiment 3. An example in which the rotating electric machine device 100 is applied to the electric power steering device 150 mounted on a vehicle will be described.

[0079] Figure 5 It is an overall structural diagram of the electric power steering device 150, which is an example of a rack-type electric power steering device 150. When a driver generates a steering torque on the steering mechanism of the vehicle by the steering wheel 151, the torque sensor 152 detects the steering torque and outputs it to the rotating electric machine device 100. In addition, the speed sensor 153 detects the traveling speed of the vehicle and outputs it to the rotating electric machine device 100. The rotating electric machine device 100 generates an auxiliary torque for assisting the steering torque based on the inputs from the torque sensor 152 and the speed sensor 153, and supplies the auxiliary torque to the steering mechanism of the front wheels 154 of the vehicle. The torque sensor 152 and the speed sensor 153 are Figure 2Part of the vehicle sensor 31 therein. The rotary electric machine device 100 can also generate auxiliary torque based on inputs other than the torque sensor 152 and the speed sensor 153.

[0080] By miniaturizing the rotary electric machine device 100 applied to the electric power steering device 150, the mountability on the vehicle is improved. Cost reduction of the rotary electric machine device 100 also contributes to cost reduction of the entire electric power steering device 150. The same applies to the case of using the rotary electric machine device 101 instead of the rotary electric machine device 100.

[0081] Although this application describes various exemplary embodiments and examples, the various features, modes, and functions described in one or more embodiments are not limited to the application of a specific embodiment and can be applied alone or in various combinations to the embodiments. Therefore, it can be considered that countless unillustrated variations are also included in the technical scope disclosed in this application specification. For example, it is assumed to include cases of deforming, adding, or omitting at least one component, and cases of extracting at least one component and combining it with components of other embodiments.

[0082] Reference Numeral Explanation

[0083] 2 Power terminal

[0084] 3 Electromagnetic shield

[0085] 4 Power module

[0086] 7 Radiator

[0087] 10 Signal terminal

[0088] 11 Filter circuit

[0089] 12 Opening for external connection

[0090] 13 Relay component

[0091] 17 Drive circuit

[0092] 19 Control board

[0093] 20 Rotary electric machine

[0094] 21 Output shaft

[0095] 100, 101 Rotary electric machine device

[0096] 150 Electric power steering device.

Claims

1. A rotary electric machine device, characterized in that, comprising: a rotary electric machine having a rotating shaft and windings; a power module disposed on the anti-output side of the axial direction of the rotating shaft with respect to the rotary electric machine and fixed to the rotary electric machine to supply power to the windings of the rotary electric machine; a control substrate on which a drive circuit for driving the power module is mounted and having an extension portion extending toward the anti-output side of the axial direction of the rotating shaft; an electromagnetic shielding member surrounding the power module and the drive circuit and having an external connection opening through which the extension portion of the control substrate passes; an external connection terminal disposed outside the electromagnetic shielding member and connected to the extension portion of the control substrate; and a filter circuit mounted on the extension portion of the control substrate to attenuate noise components propagating to the external connection terminal.

2. The rotary electric machine device according to claim 1, characterized in that, the filter circuit is mounted at a position of the extension portion of the control substrate that passes through the external connection opening of the electromagnetic shielding member.

3. The rotary electric machine device according to claim 1 or 2, characterized in that, it includes a radiator located between the power module and the rotary electric machine, performing heat transfer with the power module, and having the same potential as the rotary electric machine, the electromagnetic shielding member is in the shape of a bottomed cylinder, the cylindrical peripheral portion is connected to the rotary electric machine or the radiator, and the bottom has the external connection opening.

4. The rotary electric machine device according to claim 3, characterized in that, the cylindrical peripheral portion of the electromagnetic shielding member is connected to the rotary electric machine or the radiator at a portion on the other side of the heat transfer portion between the radiator and the power module and closer to the axial direction of the rotating shaft.

5. The rotary electric machine device according to claim 1 or 2, characterized in that, the filter circuit is connected to the electromagnetic shielding member via a relay member.

6. The rotary electric machine device according to claim 5, characterized in that, the relay member is connected to the external connection opening of the electromagnetic shielding member.

7. The rotary electric machine device according to claim 5, characterized in that, the potential of the electromagnetic shielding member is used as the ground potential of the filter circuit.

8. The rotary electric machine device according to claim 1 or 2, characterized in that, the external connection terminal is connected to the extension portion of the control substrate at a position more outside with respect to the external connection opening of the electromagnetic shielding member.

9. An electric power steering device, characterized in that, it includes the rotary electric machine device according to any one of claims 1 to 8.

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