Patent ID: 8022588

Claim:
A single-phase motor comprising: a stator iron core formed by laminating a plurality of electromagnetic steel sheets and provided with N slots, where N/2 is odd, a part of which are large slots and others are small slots having a shallower depth in a radial direction; a main winding of 2-pole single-phase concentric winding arrangement inserted to the large slots or the small slots; and an auxiliary winding of 2-pole single-phase concentric winding arrangement inserted to the large slots or the small slots, wherein a magnetic pole angle, which is an angle formed by a main winding magnetic pole generated by flowing electric current to the main winding and an auxiliary winding magnetic pole generated by flowing electric current to the auxiliary winding, is made (90−360/2N) degrees or (90+360/2N) degrees, and wherein an occupying rate of winding is defined as a rate of cross section area of winding occupied in a slot area, and those of the N slots having an occupying rate of winding which is smaller than would otherwise be the case if the magnetic pole angle were instead 90 degrees, are made the small slots, and the other slots are made the large slots.