Patent ID: 7619332
Filing Date: 2009-11-17
Classification: F03D,F05B,H02K,Y02E

Abstract:
1. A permanent magnet type electric rotating machine comprising a stator having a distributed winding, a permanent magnet rotor, an air cooler covering the stator, and a fan connected to a shaft, wherein the permanent magnet rotor is provided with at least one axial air passage in an axial direction thereof, and a plurality of duct pieces arranged to support a plurality of permanent magnets, and form a plurality of radial air flow passages extending in a radial direction connected to the at least one axial air passage so as to enable flow of cooling air from the at least one axial air passage into the air cooler and to enable cooling of the electric rotating machine by the cooling air driven by the fan, wherein each duct piece of the plurality of duct pieces is sandwiched in the axial direction between the permanent magnets of the plurality of permanent magnets so that the duct pieces prevent displacement of the permanent magnets in the axial direction.