Mitsuba Corporation

Mitsuba Electric Manufacturing Co., Ltd.

Atsushi Shimura

Masashi Fukui

Takayoshi Sakamoto

Yutaka Hoshino

Hirobumi Matsumura

Hideaki Noguchi

A fan motor has an end case having an annular recess. An air passage hole is formed in the annular recess defined by axially outer and inner tubular guide walls formed on the end case. A cover member covering the air passage hole is provided on a fan shroud. First and second ring-shaped ribs are integrally formed on the side of the cover member facing the end case, so as to form a labyrinth structure in cooperation with an open end of a motor yoke and with the radially outer peripheral surface of the annular recess.

Cooling structure of fan motor

In a multi-pole electric motor, the terminal pieces of same polarities are placed adjacent to each other while the terminal pieces of different polarities are placed remote from each other, and the terminal pieces of common polarities are connected by shunt tabs which can be selectively cut apart. For instance, when a four-pole electric motor is to be used as a one-speed motor, the shunt tabs connected across associated terminal pieces are not cut apart, and the terminal pieces are appropriately connected to external power lines. When the motor is to be used as a two-speed motor, the shunt tabs connected across associated terminal pieces are cut apart, and the terminal pieces are appropriately connected to external power lines. Thus, the electric motor can be readily adapted either as a one-speed motor or a two-speed motor by using standardized component parts. Furthermore, even when the motor should overheat, there would be no short-circuiting, and the reliability of the motor can be improved.

Multi-pole electric motor with brush holder device having two terminal

Method of fusing commutator risers to armature coil in electric motor

Growing community of inventors

Gunma-machi, Japan

Atsushi Shimura