Patent ID: 8227952
Filing Date: 2012-07-24
Classification: H02K

Abstract:
1. A synchronous machine comprising: a stator having a cylindrical shape having an axial direction, a radial direction, and a circumferential direction; a rotor that faces the stator and rotates on a shaft thereof in the circumferential direction, the rotor having magnetic salient poles that generate reluctance torque and magnet-originating magnetic poles that generate magnet torque by using permanent magnets embedded in the rotor; and means for shifting a substantial central position of magnetic flux emanating from the permanent magnets in the circumferential direction by a predetermined angle Δθ of 5 - 25 degrees, from a reference position taken as a central position between each respective pair of adjacent magnetic salient poles, such that a maximum amplitude of a sum between a harmonic component of the magnet torque and the reluctance torque is changed from a maximum amplitude of a sum between the harmonic component of the magnet torque and the reluctance torque both obtained at the reference position without the shift.