Patent ID: 9627936
Date: 2017-04-18
CPC Classifications: H02K

Claim:
1. A permanent magnet motor comprising: a rotor including a rotor iron core and a plurality of permanent magnets provided in the rotor iron core; and a stator including a stator iron core and two sets of three-phase armature windings provided in a plurality of slots formed in the stator iron core, wherein one set of the armature windings is supplied with current from a first inverter, and the other set of the armature windings is supplied with current from a second inverter, in the case where a pole number of the rotor is M and a slot number of the stator iron core is Q, M and Q satisfy a relationship of M <Q and a greatest common divisor of M and Q is equal to or greater than 3, in the rotor, the rotor iron core is located on the stator side beyond a radius intermediate between the maximum outer radius and the minimum inner radius of the permanent magnets, a phase difference between three-phase currents supplied from the first inverter and three-phase currents supplied from the second inverter is controlled to fall within a range of electric angles of 20 to 40 degrees, a M number of the permanent magnets are arranged along the circumferential direction of the rotor, where M is the pole number of the rotor, and are provided at a surface of the rotor iron core, and a protruding portion made of magnetic material is present between the adjacent permanent magnets of the rotor, and an outer side of the protruding portion in a radial direction protrudes toward the stator side beyond a radius intermediate between the maximum outer radius and the minimum inner radius of the permanent magnets.