D.C. motors with unequal pole spacing
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United States of America Patent
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-
Oct 13, 1987
Grant Date -
N/A
app pub date -
Dec 27, 1985
filing date -
Dec 28, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary electric apparatus comprising a field magnet having different magnetic poles arranged alternately on a circumferential surface, an armature including an armature core having slots formed therein as distributed on a circumferential surface opposed to the magnetic circumferential surface, to provide salient poles between the slots, each of the salient poles having an armature winding wound therearound, and a shaft supporting either the armature or the field magnet rotatably, relative to the other. The magnetic poles of the field magnet or the slots of the armature core are formed at unequal spacings determined by some equations, so that positions where cogging occurs can be distributed.
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