PERMANENT MAGNET EMBEDDED MOTOR

PROBLEM TO BE SOLVED: To solve the problem of a conventional permanent magnet embedded motor that it can not be downsized since torque up is not achieved, for the quantity of effective magnetic flux is saturated by the influence of the magnetic saturation at the periphery of a rotor core when an overhang part becomes a measure of length in a permanent magnet embedded motor. SOLUTION: In the permanent magnet embedded motor 1 where magnetic substances are arranged at the rotor end faces which have second rotors 6 where second permanent magnets 7 where the same magnetic poles as the magnetic poles at the periphery of the first rotor core 4 are so magnetized axially as to be on the side of the first rotor core 4 which has a first permanent magnet 5 opposed to the stator core via an air gap, the axial dimension 72 between the magnetic poles of the second permanent magnet 7 is shorter than the axial dimension 71 at the center of the magnetic pole, and for the axial dimension of the magnetic substance arranged at the end face of the permanent magnet, the axial dimension 81 between the magnetic poles is larger than the axial dimension 82 at the center of the magnetic pole between the permanent magnet poles. COPYRIGHT: (C)2007,JPO&INPIT