Stepping motor

Details Stepping motor Stepping motor

2007-02-06

2007-02-06

Nguyen, Tran N. (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S049030

Reexamination Certificate

active

11080416

ABSTRACT:
A stepping motor includes a magnet ring1whose outer peripheral surface is circumferentially divided to form radial protrusions and recesses and whose outer peripheral surface consists of a cylindrical permanent magnet magnetized to the same polarity, first and second cylindrical coils2and3, a first outer magnetic pole portion8excited by the first coil, a second outer magnetic pole portion9excited by the second coil, and an output shaft10formed of a soft magnetic material and fixed to the inner peripheral portion of the magnet ring, the output shaft10being opposed to at least one of the first outer magnetic pole portion and the second outer magnetic pole portion in a predetermined axial range and equipped with an inner magnetic pole portion excited by at least one of the first coil and the second coil. Accordingly, a low-cost, high output, and high resolution stepping motor can be provided without hindering miniaturization.

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