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

Claim 10:
11. 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
an inner diameter of the circular cylinder portion is greater than an outer diameter of the magnet, the rotor has a rotor core in which an engagement hole extending in an axial direction is arranged and which is mounted between a magnet mounting portion of the shaft and the magnet, the engagement latch portion extends in the axial direction from the turned-back portion, and
in the insertion process, the engagement latch portion is engaged with an inner surface in a circumferential direction of the engagement hole,
wherein a press-fitted portion which is press-fitted into an inner peripheral surface of the engagement hole is arranged in a base end portion of the engagement latch portion; and a guide portion is arranged in a top end portion of the engagement latch portion, wherein the guide portion has a width in the circumferential direction smaller than that of the press-fitted portion, and guides the engagement latch portion when the engagement latch portion is inserted into the engagement hole.