Asmo Co., Ltd.

Hisashi Masui

Toshiyasu Ishizuka

Takahiro Yamada

Akihiro Suzuki

Kazushi Sugishima

Noriyuki Suzuki

Takashi Saito

Hirozumi Nishizaki

Norikazu Taguchi

Mitsuo Odagiri

A brush holding device includes a dielectric resin circuit board and at least one metal brush holder secured to the circuit board at its base portion. Each brush holder includes a receiving recess that receives a brush and a spring for urging the brush against a commutator. A side wall of the brush holder located at a radially outer side of the brush holder includes an engaging piece that resiliently engages against an inner peripheral surface of an outer peripheral wall of the circuit board.

Brush holding device capable of reducing noise

In a commutator of an armature of an electric motor, a plurality of segments are arranged on the outer peripheral surface of a commutator ring at equal angular intervals. The segments which are in the same phase and oppose with 180&deg; angular interval are connected through a conductive plate. Each conductive plate is spaced apart a predetermined distance from adjacent ones in the axial direction not to short, and molded within the commutator ring. Each of brushes is shaped to have a width which is sufficient to bridge over three segments. Alternatively, the commutator ring may be shaped to have a tapering protrusion part (,) and the same-phase segments may be directly connected by a shorting wire along the tapering protrusion part.

Electric motor having brushes and commutator of armature

A stator of an electric motor provides pole retaining portions which retain the poles therein and are radially project at their end portions towards the outer periphery in a ring shape, whereby winding operations around the outer surface of the pole retaining portion are performed from the outside without any restriction, thus allowing a small-sized motor stator to be easily manufactured.

Stator of electric motor

Growing community of inventors

Kosai, Japan

Hisashi Masui