Patent ID: 11929658
Assignee: NIDEC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  A  Y | IPC H

Claim 11:
12. An electric motor comprising:
housing including a tubular wall extending in an axial direction of the housing and closures positioned at opposite axial ends of the tubular wall;
a stator fixed; mounted inside of the housing;
a rotor rotatable mounted inside of the housing;
a bearing rotatably supporting the rotor; wherein
at least one of the closures includes a rotor supporting portion that includes a through hole to receive a portion of the rotor;
the through hole is defined by a closed shape including at least three or more straight sides;
at least another one of the closures is separate from the tubular wall, and includes a radially inner portion which includes the rotor supporting portion and a radially outer flange which is in physical contact with a radially inner surface of the tubular wall and extends from the radially inner portion of the at least another one of the closures towards an opposite axial end of the tubular wall;
the radially inner portion of the at least another one of the closures which is separate from the tubular wall includes:
a rotor supporting portion including an annularly shaped circumferential wall extending in the axial direction;
an axial end wall including another through hole;
a bearing insertion opening at an axial end thereof opposite to the axial end wall;
the axial end wall is provided at an end on an inner side of the housing with respect to the annularly shaped circumferential wall; and
the bearing insertion opening is provided at the axial end on an outer side of the housing with respect to the annularly shaped circumferential wall.