Motor and electric power steering system

摘要

The invention provides a motor including: a cylindrical motor case having a bottom that supports an outer circumferential surface of a stator core by an inner circumferential surface thereof; and a bracket that supports an output shaft side bearing and closes an opening of the motor case; wherein the stator core is press-fitted into the motor case from the opening such that a part of the stator core is exposed from the motor case, and a part of the stator core that is not press-fitted to the motor case forms a sliding fitting wall capable of providing a sliding fitting connection with the bracket.

主权项

1. A motor comprising:
a stator core; a rotor comprising a plurality of magnets and an integral rotation shaft; an output side bearing that engages and rotationally supports an output side of the rotation shaft; a cylindrical motor case having a bottom that supports an outer circumferential surface of the stator core by an inner circumferential surface thereof; and a bracket that directly supports the output side bearing and closes an opening of the motor case; an end housing that press-fits into the cylindrical motor case, the end housing including a through hole that directly supports another bearing at a side of the rotor opposite the output side bearing; and a cover that overlaps the bottom of the motor case and that covers the end housing, wherein the stator core includes a first portion that press-fits into the motor case from the opening and a second portion that extends from the first portion beyond an end of the motor case, the second portion including a sliding fitting connection with the bracket to align a center of the bracket to a center of the rotation shaft based on the stator core, and wherein the motor is a brushless motor.