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A three-phase direct-current motor has a field magnet having P field poles positioned as a circular array at angularly equally spaced intervals, and an armature having cores providing N slots with three-phase coils disposed therein, either the field magnet or the armature being rotatable with respec

A three-phase direct-current motor has a field magnet having P field poles positioned as a circular array at angularly equally spaced intervals, and an armature having cores providing N slots with three-phase coils disposed therein, either the field magnet or the armature being rotatable with respect to the other. P and N are defined by P=2(4n+3) and N=3(2n+1) where n is an integer of 1 or more, and being selected such that the least common multiple of N and P is equal to N×P. Alternatively, P and N are defined by P=2(3n±1) and N=6n where n is an integer of 2 or more.

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A three-phase direct-current motor comprising: a field magnet having P field poles positioned as a circular array at angularly equally spaced intervals; an armature having cores as angularly equally spaced N protruding poles providing N slots therebetween the three-phase coils disposed therein; eith

A three-phase direct-current motor comprising: a field magnet having P field poles positioned as a circular array at angularly equally spaced intervals; an armature having cores as angularly equally spaced N protruding poles providing N slots therebetween the three-phase coils disposed therein; either said field magnet or said armature being rotatable with respect to the other; and P and N being defined by P=2(4n+3) and N=3(2n+1) wherein n is an integer of 1 or more, and being selected such that the least common multiple of N and P is equal to N x P.