Compact cylindrical stepping motor and advancing device

Details Compact cylindrical stepping motor and advancing device Compact cylindrical stepping motor and advancing device

1997-04-02

1998-11-03

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310266, H02K 3710

Patent

active

058313567

ABSTRACT:
An ultra compact motor, comprises a magnet which is formed in a cylindrical shape and is circumferentially divided into n portions and alternately magnetized into different magnetic poles at least on the external periphery thereof. A first coil, a rotor and a second coil are arranged in this order along the axial direction of the rotor, and first external and internal magnetic poles magnetized by the first coil are arranged so as to oppose respectively the external and internal peripheries of the magnet at an end of the magnet while second external and internal magnetic poles magnetized by the second coil are arranged so as to oppose respectively the external and internal peripheries of the magnet at the other end of the magnet.

REFERENCES:
patent: 3479539 (1969-11-01), Brion
patent: 4767958 (1988-08-01), Sasaki
patent: 4999559 (1991-03-01), Katz
patent: 5153626 (1992-10-01), Yamamoto
European Search Report dated Aug. 1, 1997.

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