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

Claim 11:
12. A method for manufacturing an electric motor, wherein the electric motor comprises: 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 method for manufacturing the electric motor comprises:
a working process in which a press working is performed on a magnet cover which has a circular cylinder portion, a turned-back portion that is integrally arranged in one end portion of the circular cylinder portion and protrudes inward in a radial direction, and an engagement latch portion that is integrally arranged on the turned-back portion;
an assembly process in which the rotor which comprises the rotor body portion having the magnet and the shaft is assembled; and
an insertion process in which the rotor is inserted into the magnet cover, and the engagement latch portion is engaged with the rotor to prevent rotation of the magnet cover with respect to the rotor, wherein
the engagement latch portion extends inward in the radial direction from the turned-back portion, an engagement surface is arranged on an outer peripheral surface of the rotor, and
in the insertion process, the engagement latch portion is engaged with the engagement surface,
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.