Mabuchi Motor Co., Ltd.

Kazutoshi Yoshimura

Isao Shibuya

Kenji Hagiwara

Kenji Tsuyama

A miniature motor comprising a case made of a metallic material, formed into a bottomed hollow tubular shape and having a permanent magnet fixedly fitted to the inner circumferential surface thereof, a rotor having an armature facing the permanent magnet and a commutator, and a case cap fitted to an open end of the case, and having brushes for making sliding contact with the commutator and input terminals electrically connected to the brushes; the rotor being rotatably supported by bearings provided on the bottom of the case and the case cap, in which an internal space defined by the case and the case cap is filled with an atmosphere of a polymer having a weight-average molecular weight of 50-5000.

Miniature motor

A miniature motor comprising a case made of a metallic material, formed into a bottomed hollow cylindrical shape and having permanent magnets on the inner circumferential surface thereof, a rotor consisting of an armature facing the permanent magnets and a commutator, and a case cap fitted to an open end of the case and having brushes making sliding contact with the commutator and input terminals electrically connected to the brushes; the rotor being rotatably supported by bearings provided on the bottom of the case and the case cap, in which an internal space defined by the case and the case cap is filled with an atmosphere of one or more than two types of polymethacrylate, polyacrylate, polyisobutylene, low molecular weight polyethylene, low molecular weight polypropylene, ethylene-propylene copolymer, polyvinyl acetate, and polybutene.

A miniature d-c motor comprising a case on the inner circumferential surface of which a permanent magnet is mounted, a rotor consisting of an armature and a commutator, and a case cap on which brushes and input terminals are mounted; the rotor being supported via bearings provided on the case and the case cap, in which the miniature d-c motor is housed in a hermetically-sealed internal space defined by the hermetic case formed into a bottomed hollow cylindrical shape and the hermetic case cap fitted to an open end of the hermetic case, and an output shaft connected to a rotor shaft via a magnetic coupling is rotatably provided outside the bottom of the hermetic case.

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Matsudo, Japan

Kazutoshi Yoshimura