PERMANENT MAGNET MOTOR

摘要

A permanent magnet motor includes a P-pole-implanted permanent magnet rotator containing a ferrite magnet in a laminated silicon steel sheet, wherein, at one pole, a U-shaped permanent magnet comprising three parts, and, at the outer periphery of the U-shaped magnet, one outer-periphery permanent magnet disposed longitudinally in the peripheral direction are provided to generate permanent magnet torque. At one pole, the permanent magnet rotator generates reluctance torque using two salient poles formed between the U-shaped permanent magnet and the outer-periphery permanent magnet. One central salient pole is formed between the adjacent poles. A stator comprises an M-phase stator winding that is a distributed winding, and a stator core having Ns slots. The ratio of Ns/P/M is a common fraction. When the width of the center salient pole is set to τcp and the slot pitch of the stator core is set to τs, τcp is smaller than τs.

主权项

1. A permanent magnet motor comprising:
a permanent magnet rotator of P-pole-implanted type having a ferrite permanent magnet contained in a laminated silicon steel sheet, in which a U-shaped permanent magnet including three parts and an outer-periphery permanent magnet disposed longitudinally in the peripheral direction at the outer periphery of the U-shaped permanent magnet are provided at one pole to generate permanent magnet torque, and two salient poles formed between the U-shaped permanent magnet and the outer-periphery permanent magnet, and one central salient pole formed between the U-shaped permanent magnets of adjacent poles are provided at one pole to generate reluctance torque; and a stator including a distributed M-phase stator winding and a laminated stator core having Ns slots for storing the stator winding, a ratio of Ns/M/P being a common fraction, wherein: when a width of the central salient pole is set to τcp and a slot pitch of the stator core is set to τs, the central salient pole width τcp is smaller than the slot pitch τs.