Patent ID: 11962198
Assignee: MITSUBA CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 8:
9. An electric motor comprising: a stator which is housed in a motor case, and a rotor which comprises a shaft being rotatably supported by the motor case and a rotor body portion having a magnet disposed inside the stator, wherein
the electric motor has a magnet cover comprising: a circular cylinder portion which covers an outer peripheral surface of the magnet; a turned-back portion which is arranged in one end portion of the circular cylinder portion and is in contact with one end surface of the rotor body portion; and a fastening end portion which is fastened to a flange portion arranged on the shaft so as to cover the other end surface of the rotor body portion; and
an engagement latch portion engaged with the rotor is arranged on the turned-back portion, wherein
the engagement latch portion extends inward in a radial direction from the turned-back portion,
two engagement surfaces being flat surfaces are formed in parallel to each other and being flat on the outer peripheral surface of the rotor, and
the engagement latch portion has top end surfaces extending along a width direction on the engagement surfaces and being parallel to each other to engage with the engagement surfaces,
when a guide surface is arranged closer to one end surface side of the rotor body portion than the engagement surface, and when the engagement latch portion is moved toward the engagement surface, the guide surface guides the engagement latch portion,
wherein a plurality of protrusions are arranged on a top end of the engagement latch portion, and the protrusions are engaged with the flat surface.