Kabushiki Kaisha Tokai Rika Denki Seisakusho

Toshio Tanase

Tomohisa Kuwako

Naoshi Sasase

A miniature electric motor with a rotor having pole teeth simultaneously magnetizable in opposite polarities upon energization of an exciting coil, being provided with high magnetic reluctance grooves for magnetically separating each pole tooth from the adjacent ones.

Miniature electric motor

A miniature self-starting electric motor includes a rotor shaft rotatably disposed in a casing. Two rotors fixed to said rotor shaft each have a circular body portion of soft magnetic material, said circular body portion having a periphery with pole teeth extending therefrom and spaced from each other at equal angular spacings. Two exciting coils each are disposed to face the pole teeth. Two magnets each provide radially north and south poles alternating at an equal angle with axially same polarities as the other magnet and facing the pole teeth, the number of poles on each permanent magnet being an even multiple of the number of pole teeth. The two rotors are in an opposite relation each other, the pole teeth of one of said two rotors being staggered from the pole teeth of the other by a predetermined electric angle. A condenser is selectively connectible to either one of said two exciting coils. Such miniature self-starting motor rotates reliably in a predetermined direction at the time of starting. Further, the direction of rotation can be selectively determined by operating a switch.

Growing community of inventors

Beppu, Japan

Toshio Tanase