Patent ID: 7064466
Filing Date: 2006-06-20
Classification: H02K

Abstract:
1. A brushless rotary electric machine including a stator having an armature winding, a rotor disposed to face said stator at an air gap for providing a rotating magnetic field, a shaft rotatably supporting said rotor and an annular field coil, wherein said rotor comprises: a pair of rotary cores disposed tandem, each said rotary core having a pole surface facing said stator, a center core portion carried by said shaft and an annular space around said center core portion for accommodating said field coil; a plurality of permanent magnets disposed on said pole surface of each said rotary core at equal intervals in the circumferential direction thereof so that each of said permanent magnets on one of said rotary core is disposed at an angular position between two of said permanent magnets on the other rotary core; a permanent magnet disposed between said rotary cores near said pole surface magnetized to prevent leakage of magnetic flux of the rotating magnetic field.