Patent ID: 6858961
Filing Date: 2005-02-22
Classification: B60L,H02K,Y02T

Abstract:
1. A motor comprising: a rotor including a permanent magnet type rotor unit having a plurality of permanent magnets, and a reluctance type rotor unit having a plurality of magnetic salient pole portions and a plurality of slits for preventing magnetic flux leakage, said permanent magnet type rotor unit and said reluctance type rotor unit being coupled to each other in an axial direction with a predetermined angle deviation in a direction of rotation; and a stator for generating a field for driving said rotor, wherein elongated holes or notches for preventing short-circuit of magnetic fluxes are arranged near edges of said permanent magnets of the permanent magnet type rotor unit, and the elongated holes or the notches are arranged within a range defined so that 0.95α≦θ≦1.05α with α={(360/S)−R}/2 (degrees), where θ is an angle formed between a magnetic pole boundary and a center of the elongated hole or the notch in a forward direction of rotation of the rotor with respect to a center of a rotating shaft, R is an angle formed by a tooth width of the stator with respect to the center of the rotating shaft, P is the number of rotor poles, and the number of stator slots is S=3P/2.