Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-12-02
1993-08-03
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310179, H02K 106, H02K 304
Patent
active
052332535
ABSTRACT:
A first multi-phase dc motor comprising: a field-magnet portion having P field magnetic poles positioned as a circular array at angularly equally spaced intervals; and an armature having cores as angularly equally spaced N protruding poles providing N slots therebetween with .phi.-phase coils disposed therein, either said field magnet portion or said armature being rotatable with respect to the other; and P, N, and .phi. being defined by P=2n, N=2n.+-.1, and N is not m times .phi. wherein n and m are natural numbers.
A second multi-phase dc motor comprising: a field-magnet portion having P field magnetic poles positioned as a circular array at angularly equally spaced intervals; and an armature having cores as angularly equally spaced N protruding poles providing N slots therebetween with .phi.-phase coils disposed therein, either said field magnet portion or said armature being rotatable with respect to the other; and P, N, and .phi. being defined by P=2n, N=2(n.+-.1), and N is not m times .phi.. According to the invention, frequency of cogging per one turn is more than that of the conventional motor with the same number of magnet poles, so that degree of cogging torque is reduced.
REFERENCES:
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patent: 4719378 (1988-01-01), Katsuma et al.
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patent: 4833355 (1989-05-01), Kawashima
patent: 4847712 (1989-07-01), Crapo
patent: 4967464 (1990-11-01), Stephens
patent: 5006745 (1991-04-01), Nishio et al.
Kumazawa Masaru
Nishio Akira
Haszko D. R.
Stephan Steven L.
Victor Company of Japan Ltd.
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