Patent ID: 8487497

Claim:
A motor system comprising a motor and an inverter, wherein the motor includes a rotor and a stator that is disposed to face the rotor with a gap formed therebetween, the rotor includes a plurality of magnet poles, which have the same polarity at a periphery of the rotor facing the stator, and a plurality of consequent poles that have an opposite polarity to the magnet poles at the periphery of the rotor, each of the magnet poles is formed of at least one permanent magnet, and each of the consequent poles is formed of a soft magnetic material, the magnet poles are alternately arranged with the consequent poles in a circumferential direction of the rotor, the stator includes a stator core and a stator coil mounted on the stator core, the stator core has a plurality of slots that are formed in a surface of the stator core facing the rotor and arranged in a circumferential direction of the stator core at predetermined intervals, the stator coil is comprised of first and second m-phase coils that are electrically insulated from each other, where m is an integer greater than 1, the number of the slots of the stator core provided per circumferentially-adjacent pair of the magnet and consequent poles is equal to 4m, each of the first and second m-phase coils is comprised of m phase windings, the first and second m-phase coils are received in the slots of the stator core so that the phase windings of the first m-phase coil are alternately arranged with the phase windings of the second m-phase coil in the circumferential direction of the stator core, and the inverter energizes the first and second m-phase coils to cause them to respectively create first and second spatial magnetic fluxes in the gap between the rotor and the stator, and variation in a resultant spatial magnetic flux, which is the resultant of the first and second spatial magnetic fluxes, is less than variations in the first and second spatial magnetic fluxes in the circumferential direction of the rotor.