Patent ID: 8283833
Filing Date: 2012-10-09
Classification: H02K,Y10T

Abstract:
1. A rotor for an electric rotary machine comprising: a pair of field iron cores fixed to a rotary shaft and having pluralities of claw-shaped magnetic poles meshing with each other with a given distance between circumferentially adjacent claw-shaped magnetic poles in a circumferential direction of the rotor, each of the claw-shaped magnetic poles having circumferentially facing side walls with outer circumferential portions formed with engaging stop portions circumferentially protruding in flanged shapes, respectively; a field winding wound on the pair of field iron cores; a plurality of permanent magnets each disposed between sidewalls of the circumferentially adjacent claw-shaped magnetic poles and magnetized in a direction to reduce leakage of magnetic flux between the circumferentially adjacent claw-shaped magnetic poles; and a non-magnetic magnet support ring configured to support the permanent magnets such that the permanent magnets are movable with respect to the magnet support ring, the magnet support ring being disposed on the plurality of permanent magnets on inner peripheral sides thereof; the magnet support ring including support means for supporting the permanent magnets to allow each permanent magnet to be disposed between the sidewalls of the circumferentially adjacent claw-shaped magnetic poles while permitting the magnet support ring to be disposed on the claw-shaped magnetic poles on the inner peripheral sides thereof under which the inner peripheral sides of the permanent magnets are supported with the magnet support ring so as to allow the engaging stop portions of the circumferentially adjacent claw-shaped magnetic poles to restrict each permanent magnet from moving radially outward; and positional displacement restricting means provided on the magnet support ring for restricting a positional displacement of each permanent magnet with respect to the magnet support ring in a longitudinal direction thereof along the sidewalls of each claw-shaped magnetic pole, wherein the positional displacement restricting means includes one of a concaved portion and an apertured portion formed on at least one of the magnet support ring and each permanent magnet and a convexed portion formed on the other one of the magnet support ring and each permanent magnet, the convexed portion being held in fitting engagement with the one of the concaved portion and the apertured portion.