Stepping motor

Details Stepping motor Stepping motor

2005-03-22

2005-03-22

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S049030

Reexamination Certificate

active

06870291

ABSTRACT:
There is provided a stepping motor of low vibration realized by reducing cogging with a simple structure while maintaining the performances such as torque. A stepping motor of the invention is structured such that a stator unit18is composed of a pair of stator sub-assemblies5, 5attached to each other in a back to back manner, each stator sub-assembly having a plurality of pole teeth13formed at its inner circumference and housing a coil inside thereof, a rotor unit19is rotatably disposed with a small gap from the plurality of pole teeth13and having multiple magnetic poles formed on ah circumference thereof, the multiple magnetic poles of the rotor unit19being formed by magnetizing the rotor unit19alternately with an S pole and an N pole in a circumferential direction, and that while a magnetic pole width consisting of a width of the S pole and a width of the N pole in a pair is set to a predetermined constant value, the width of the S pole and the width of the N pole in each pair are set to be different from each other.

REFERENCES:
patent: 4703211 (1987-10-01), Yazaki et al.
patent: 4737674 (1988-04-01), Miyao
patent: 4968913 (1990-11-01), Sakamoto
patent: 5107159 (1992-04-01), Kordik
patent: 5705871 (1998-01-01), Suzuki et al.
patent: 5847483 (1998-12-01), Suzuki et al.
patent: 60043060 (1985-03-01), None

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