Patent ID: 7839043
Filing Date: 2010-11-23
Classification: H02K

Abstract:
1. A rotary structure of a permanent magnet electric machine, comprising: a stator having K salient teeth peripherally spaced with equal intervals for forming K winding slots, wherein K is a natural number greater than 1; and a rotor having an annular inner surface, having P pairs of permanent magnets peripherally spaced with equal intervals along the inner surface for rotating around the stator, wherein P is a natural number, wherein each permanent magnet having two sides along a peripheral direction of the rotor comprises a pair of inclined surfaces on the two sides, the pair of inclined surfaces is symmetric with respect to a radial plane of the each permanent magnet and an inclined angle α between the inclined surface and the radial plane is selected from a range of 90(1−1/(4P))<α<90(1+1/(4P)).