Dynamoelectric machine

摘要

In a two-phase, half-wave drive brushless motor or other dynamoelectric machine, a cogging torque reduction effect can be achieved without any reduction in motor output by reducing the number of auxiliary slots on the main pole surface or auxiliary pole surface and the number of winding slots provided between the main poles and the auxiliary poles. A dynamoelectric machine, comprising: a permanent-magnet field portion having 2 n magnetic poles (where n is an even number); an armature core portion having 2 n main poles disposed facing each other at prescribed intervals in relation to the field portion, and 2 n auxiliary poles disposed between the main poles; and auxiliary slots provided on the surfaces of the main poles or auxiliary poles that face the field portion; wherein, assuming that nk (where k is an integer of 4 or greater) is the combined number of the winding slots provided between the main poles and auxiliary poles and of the auxiliary slots provided on the surfaces of the main poles or commutating poles, all the winding slots and auxiliary slots are divided into two groups of nk/2 slots each; the slots of the first group occupy positions phi i that satisfy, in terms of electrical angle, the relation phi i=(2 pi /k)i+2 pi p (i=0, 1, 2, . . . , (nk/2)-1; p is an integer of 0