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

Claim 4:
5. An electric motor comprising:
a 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 fixedly mounted inside of the housing;
a rotor rotatably 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 provided with a non-rotationally symmetric shape;
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 to tubular wall and extends from the radially inner portion of the closure 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 the 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.