Mabuchi Motor Co., Ltd.

Shotaro Hayakawa

Takanobu Lee

Hitoshi Fujiwara

A field magnet for miniature motors of a type having a stator comprising a field magnet fixedly fitted to a motor housing, an end plate fitted to an open end of the motor housing; an a rotor comprising a rotor winding wound on a rotor core; electric current being fed to the rotor winding via a commutator making sliding contact with current feeding brushes that are held by brush holders fixedly fitted to the end plate; in which cogging during motor rotation is reduced to make motor rotation smooth by forming a magnet that has at the magnetic poles thereof higher maximum magnetic energy product than any other regions.

Field magnet for miniature motors

A field magnet for miniature motors of a type having a stator comprising a field magnet fixedly fitted to a motor housing, an end plate fitted to an open end of the motor housing; and a rotor comprising a rotor winding wound on a rotor core; electric current being fed to the rotor winding via a commutator making sliding contact with current feeding brushes that are held by brush holders fixedly fitted to the end plate; in which cogging during motor rotation is reduced to make motor rotation smooth by forming a magnet that has at the magnetic poles thereof higher maximum magnetic energy product than any other regions.

A miniature motor using a rubber magnet for the permanent magnet for creating a field, in which a coating film is formed on the rubber magnet. The coating film is gas-impermeable, possibly of suitable synthetic resin, to prevent any harmful gas generated in the rubber magnet from escaping therefrom and damaging the contact surfaces of the motor.

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Matsudo, Japan

Shotaro Hayakawa