Electric drive apparatus, and electric power steering apparatus
First Claim
1. An electric drive apparatus comprising:
- a motor housing configured to house an electric motor, wherein the motor housing includes an axial end part opposite to an output part of a rotating shaft of the electric motor, and wherein the electric motor is configured to drive a controlled object of a mechanical system; and
an electronic control section arranged at the axial end part of the motor housing, and configured to drive the electric motor, wherein the electronic control section includes a control circuit part, a power supply circuit part, and a power conversion circuit part, and whereinthe axial end part of the motor housing includes a power conversion part thermal radiation region and a power supply part thermal radiation region;
the power conversion circuit part is mounted to the power conversion part thermal radiation region in a manner to allow heat to be transferred from the power conversion circuit part to the motor housing via the power conversion part thermal radiation region;
the power supply circuit part is mounted to the power supply part thermal radiation region in a manner to allow heat to be transferred from the power supply circuit part to the motor housing via the power supply part thermal radiation region, andthe axial end part of the motor housing includes a step between the power supply part thermal radiation region and the power conversion part thermal radiation region such that one of the power supply part thermal radiation region and the power conversion part thermal radiation region projects outwardly in an axial direction of the motor housing with respect to another one of the power supply part thermal radiation region and the power conversion part thermal radiation region.
2 Assignments
0 Petitions
Accused Products
Abstract
In an electric power steering apparatus, a motor housing includes an axial end part opposite to an output part of an electric motor. An electronic control section is arranged at the axial end part of the motor housing. The electronic control section includes a control circuit part, a power supply circuit part, and a power conversion circuit part. The axial end part of the motor housing includes a power conversion part thermal radiation region and a power supply part thermal radiation region. The power conversion circuit part is mounted to the power conversion part thermal radiation region to allow heat to be transferred from the power conversion circuit part to the motor housing. The power supply circuit part is mounted to the power supply part thermal radiation region to allow heat to be transferred from the power supply circuit part to the motor housing.
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Citations
18 Claims
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1. An electric drive apparatus comprising:
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a motor housing configured to house an electric motor, wherein the motor housing includes an axial end part opposite to an output part of a rotating shaft of the electric motor, and wherein the electric motor is configured to drive a controlled object of a mechanical system; and an electronic control section arranged at the axial end part of the motor housing, and configured to drive the electric motor, wherein the electronic control section includes a control circuit part, a power supply circuit part, and a power conversion circuit part, and wherein the axial end part of the motor housing includes a power conversion part thermal radiation region and a power supply part thermal radiation region; the power conversion circuit part is mounted to the power conversion part thermal radiation region in a manner to allow heat to be transferred from the power conversion circuit part to the motor housing via the power conversion part thermal radiation region; the power supply circuit part is mounted to the power supply part thermal radiation region in a manner to allow heat to be transferred from the power supply circuit part to the motor housing via the power supply part thermal radiation region, and the axial end part of the motor housing includes a step between the power supply part thermal radiation region and the power conversion part thermal radiation region such that one of the power supply part thermal radiation region and the power conversion part thermal radiation region projects outwardly in an axial direction of the motor housing with respect to another one of the power supply part thermal radiation region and the power conversion part thermal radiation region. - View Dependent Claims (2, 3, 4)
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5. An electric power steering apparatus comprising:
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an electric motor configured to apply a steering assist force to a steering shaft, depending on an output from a torque sensor, wherein the torque sensor is configured to sense a direction of rotation of the steering shaft and a rotating torque applied to the steering shaft; a motor housing configured to house the electric motor, wherein the motor housing includes an axial end part opposite to an output part of a rotating shaft of the electric motor; and an electronic control section arranged at the axial end part of the motor housing, and configured to drive the electric motor, wherein the electronic control section includes a control circuit part, a power supply circuit part, and a power conversion circuit part, and wherein the axial end part of the motor housing includes a power conversion part thermal radiation region and a power supply part thermal radiation region; the power conversion circuit part is mounted to the power conversion part thermal radiation region in a manner to allow heat to be transferred from the power conversion circuit part to the motor housing via the power conversion part thermal radiation region; the power supply circuit part is mounted to the power supply part thermal radiation region in a manner to allow heat to be transferred from the power supply circuit part to the motor housing via the power supply part thermal radiation region; and the axial end part of the motor housing includes a step between the power supply part thermal radiation region and the power conversion part thermal radiation region such that one of the power supply part thermal radiation region and the power conversion part thermal radiation region projects outwardly in an axial direction of the motor housing with respect to another one of the power supply part thermal radiation region and the power conversion part thermal radiation region. - View Dependent Claims (6, 7, 8)
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9. An electric drive apparatus comprising:
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a motor housing configured to house an electric motor, wherein the motor housing includes an axial end part opposite to an output part of a rotating shaft of the electric motor, and wherein the electric motor is configured to drive a controlled object of a mechanical system; and an electronic control section arranged at the axial end part of the motor housing, and configured to drive the electric motor, wherein the electronic control section includes a control circuit part, a power supply circuit part, and a power conversion circuit part, wherein the axial end part of the motor housing includes a power conversion part thermal radiation region and a power supply part thermal radiation region; the power conversion circuit part is mounted to the power conversion part thermal radiation region in a manner to allow heat to be transferred directly from the power conversion circuit part to the motor housing via the power conversion part thermal radiation region; the power supply circuit part is mounted to the power supply part thermal radiation region in a manner to allow heat to be transferred directly from the power supply circuit part to the motor housing via the power supply part thermal radiation region; and the power conversion circuit part and the power supply circuit part are arranged to be closer to the motor housing in an axial direction of the motor housing than the control circuit part. - View Dependent Claims (10, 11, 12, 13)
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14. An electric power steering apparatus comprising:
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an electric motor configured to apply a steering assist force to a steering shaft, depending on an output from a torque sensor, wherein the torque sensor is configured to sense a direction of rotation of the steering shaft and a rotating torque applied to the steering shaft; a motor housing configured to house the electric motor, wherein the motor housing includes an axial end part opposite to an output part of a rotating shaft of the electric motor; and an electronic control section arranged at the axial end part of the motor housing, and configured to drive the electric motor, wherein the electronic control section includes a control circuit part, a power supply circuit part, and a power conversion circuit part, wherein the axial end part of the motor housing includes a power conversion part thermal radiation region and a power supply part thermal radiation region; the power conversion circuit part is mounted to the power conversion part thermal radiation region in a manner to allow heat to be transferred directly from the power conversion circuit part to the motor housing via the power conversion part thermal radiation region; the power supply circuit part is mounted to the power supply part thermal radiation region in a manner to allow heat to be transferred directly from the power supply circuit part to the motor housing via the power supply part thermal radiation region; and the power conversion circuit part and the power supply circuit part are arranged to be closer to the motor housing in an axial direction of the motor housing than the control circuit part. - View Dependent Claims (15, 16, 17, 18)
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Specification