Patent ID: 8247940
Filing Date: 2012-08-21
Classification: B60L,H02K,Y02T

Abstract:
1. A rotary electric machine comprising: a stator having stator windings; and a rotor rotatably disposed in the stator, said rotor having a rotor core provided with a plurality of magnets and a plurality of magnetic auxiliary salient poles formed linearly along an axial direction of the rotor between poles of the magnets, wherein a magnetic air gap is provided in an axial direction of the rotor in a position shifted in a circumferential direction from a q axis passing through a center of the magnetic auxiliary salient pole within the magnetic auxiliary salient pole, wherein the magnetic air gap is a concave portion formed at the surface of the rotor core, where a circumferential angle of the concave portion is set equal to or less than one half a circumferential angle of an auxiliary salient pole, and an amount of shifting the magnetic air gap from the q axis in the circumferential direction differs according to a position of the magnetic air gap in the axial direction so as to cancel torque pulsation in energization caused due to the magnetic air gap, wherein the rotor core is divided into a plurality of division cores provided in the axial direction, each of said division cores having the magnet, the magnet auxiliary salient pole and the magnetic air gap, and wherein circumferential positions of the magnets in the division cores are constant regardless of the axial positions of the magnets.