Patent ID: 9564779
Date: 2017-02-07
CPC Classifications: H02K

Claim:
1. A permanent magnet motor comprising: a rotor including a rotor iron core and a plurality of permanent magnets provided to the rotor iron core; and a stator including a stator iron core having a plurality of teeth, and two sets of three-phase armature windings provided in a plurality of slots formed in the stator iron core, a first armature winding being supplied with current from a first inverter and a second armature winding being supplied with current from a second inverter, wherein in the case where the two sets of three-phase armature windings are defined such that the first armature winding corresponds to U the U a slot opening width Ws of the stator iron core is set so as to satisfy Ws/(2πRs/Ns)≦0.15, where Rs is an inner radius of the stator iron core and Ns is a slot number of the stator iron core, and a core back thickness Wc of the stator iron core is set so as to satisfy 0.18≦Wc/(2πRs/M)≦0.50, where M is a pole number of the rotor, whereby cogging torque whose order number coincides with the slot number Ns and a 6-th order component of torque ripple are reduced.