Permanent magnet type stepping motor

Details Permanent magnet type stepping motor Permanent magnet type stepping motor

1996-07-23

1998-01-13

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 67R, 310254, 310156, H02K 3700

Patent

active

057083100

ABSTRACT:
A permanent magnet type stepping motor wherein and that at least one pitch formed by two adjacent small pole teeth of each of stator magnetic poles is different from other pitch formed by other two adjacent small pole teeth of each of the stator magnetic poles, wherein the tooth width of at least one of the two adjacent small pole teeth forming the different pitch is made different from that of the remaining small pole teeth, each stator magnetic poles having at least four small pole teeth and wherein a rotor has a rotor magnetic pole having a plurality of small pole teeth arranged at equal pitches, facing said stator magnetic poles through a gap. A permanent magnet type stepping motor has a stator having n pieces of stator magnetic pole each having m pieces of pole tooth, and a rotor having a plurality of pole teeth arranged at equal pitches n is an integer not less than three, m is an even number not less than four, a pitch of the rotor pole teeth is 2.pi., a pitch formed between (m/2)th stator pole (.tau..+-..theta..sub.0), and the other pitch is set to .tau., where .vertline.2.pi.-.tau..vertline.<.pi./12, .pi./5.ltoreq..theta..sub.0 <.pi./2, and .tau. and .theta..sub.0 are each electrical angle.

REFERENCES:
patent: 4112319 (1978-09-01), Field
patent: 4385250 (1983-05-01), Welburn
patent: 4516048 (1985-05-01), Brigham
patent: 4642494 (1987-02-01), Lundin et al.
patent: 5032747 (1991-07-01), Sakamoto
patent: 5128570 (1992-07-01), Isozaki
patent: 5410200 (1995-04-01), Sakamoto et al.

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