Patent ID: 11870326
Assignee: HITACHI ASTEMO, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. An electric drive apparatus comprising:
a motor housing configured to house an electric motor, wherein the electric motor includes a stator, a rotor, and a rotating shaft fixed to the rotor, and is configured to drive a controlled object of a mechanical system;
a permanent magnet provided at an axial end of a rotating shaft of the electric motor;
a board arranged to face the axial end of the rotating shaft, and provided with a first electrical component and a sensing part for sensing rotation of the rotating shaft in cooperation with the permanent magnet, wherein the first electrical component constitutes a power supply circuit part; and
a second electrical component that generates heat;
wherein the motor housing includes an axial end part having an outer face facing away form the electric motor, wherein the outer face of the axial end part includes a step between a first level and a second level of the outer face of the axial end part such that the second region is higher in an axial direction of the motor housing than the first level;
the permanent magnet projects toward the board with respect to the first level of the axial end part of the motor housing;
the first electrical component corresponds in position to the second level of the axial end part of the motor housing;
the second electrical component is placed on the first level of the axial end part of the motor housing and apart from the board such that heat generated by the second electrical component is transferred to the first level of the axial end part of the motor housing.