Patent ID: 8269390
Filing Date: 2012-09-18
Classification: H02K,H02P

Abstract:
1. A permanent-magnet-type rotating electrical machine comprising: a rotor with first and second permanent magnets of different magnetic characteristics embedded in a rotor core symmetrically with respect to a rotation center; a stator arranged to surround the rotor with a magnetic air gap interposing between them; and an armature coil formed on an inner circumferential part of the stator facing the magnetic air gap, the magnetic characteristics of the first permanent magnet in the rotor being a coercive force of 100 kA/m to 300 kA/m, a remanent flux density of 0.6 T or over, and a knickpoint of 0.6 T or over, the knickpoint being a point on a hysteresis curve where a reversible magnetizing range shifts to an irreversible magnetizing range, the magnetic characteristics of the second permanent magnet in the rotor being a coercive force larger than that of the first permanent magnet and a remanent flux density of 0.6 T or over, the product of the coercive force and magnetizing direction thickness of the first permanent magnet being equal to or larger than the product of the field strength and magnetizing direction thickness of the second permanent magnet at a no-load operating point, a magnetic field created by a current of the armature coil at a magnetic pole magnetizing the first permanent magnet so as to irreversibly change a flux amount of the first permanent magnet.