COMPACT THREE-PHASE PERMANENT MAGNET ROTARY MACHINE HAVING LOW WIBRATION AND HIGH PERFORMANCE

57 ABSTRACT A compact three-phase permanent magnet rotary ma chine having minimal reluctance torque and electro magnetic torque ripple, and maximum energy efficiency and starting torque per unit volume of winding, com prises an armature having 3(2n+1) ferromagnetic poles and slots and a permanent magnet assembly having 3(2n+1)1 permanent magnet poles, where n is an integer of 1 or more. Each of the three phases of the winding comprises multiple coils, each wound about a respective ferromagnetic pole and occupying a pair of slots located immediately on each side of a respective pole. The coils of a particular phase are located within a sector of the circular array of ferromagnetic poles encompassing 2n+1 poles.