Patent ID: 7583003
Filing Date: 2009-09-01
Classification: H02K

Abstract:
1. A stator for motors comprising: a stator core including an annular yoke and a magnetic pole constituent member arranged inside the annular yoke; and N excitation winding sections (N is an integer of three or more) arranged at the magnetic pole constituent member, the magnetic pole constituent member including: the yoke and the magnetic pole constituent members being respectively formed by overlaying a plurality of magnetic steel plates; the yoke having an inner peripheral surface portion in which N fitted recesses are formed to be open toward both sides of an overlaying direction of the plurality of magnetic steel plates and also toward the magnetic pole constituent member, and are respectively fitted with the one ends of the N pole columns, wherein a pair of flat-surface portions are formed continuously with an inner surface of the fitted recess, the flat-surface portions being respectively disposed on either side of the fitted recess in the circumferential direction; wherein the pair of flat-surface portions are located on the same virtual plane, having a side of an identical dimension that extends in the circumferential direction, wherein a cross-sectional shape of the inner peripheral portion of the yoke, as taken in a direction orthogonal to the overlaying direction of the magnetic steel plates, is a polygon having N sides, with the N fitted recesses respectively formed in substantially a center of each respective side of the N-side polygon; wherein the one end of the pole column is a triangle in shape; and wherein the excitation winding section includes a bobbin to be fitted with the pole column in such a manner that a part of the bobbin is fitted into a space formed between the fitted recess and the pole column fitted into the fitted recess.