Patent ID: 6512317
Filing Date: 2003-01-28
Classification: H02K

Abstract:
A permanent magnet rotor comprising:a) a rotor iron core including a plurality of circular steel plates stacked one upon the other, the iron core including: a periphery; a plurality of arcuate openings located inwardly of the periphery, each arcuate opening having rounded corners so as to form areas having generally triangular cross-sections between adjacent arcuate openings and the periphery; a central shaft hole; a plurality of vacant, arcuate holes located between inner boundaries of the plurality of arcuate openings and the central shaft hole, the arcuate holes being circumferentially displaced from the arcuate openings; and a plurality of V-shaped cutouts located in the generally triangular areas and each extending inwardly from the periphery to a location between adjacent arcuate openings; and, b) an arcuate shaped permanent magnet located in each arcuate opening, adjacent magnets having opposite polarities, each magnet having outer rounded corners and filling each of the arcuate openings, whereby the V-shaped cutouts prevent magnetic flux leakage by raising magnetic impedance in the generally triangular areas.