Patent ID: 9583999
Date: 2017-02-28
CPC Classifications: H02K

Claim:
1. A permanent magnet rotating machine comprising: a housing which houses a rotation shaft, at least two rotors connected to the rotation shaft in an axial direction of the shaft with a gap therebetween and configured to rotate together with the rotation shaft, at least one stator provided in the gap, and permanent magnets fastened to the at least two rotors or the at least one stator; an air intake port provided at a first end of the housing and an air exhaust port provided at an opposite second end of the housing, the air intake port and the air exhaust port being configured to allow cooling air to flow through the housing and through holes formed inside of the at least two rotors and/or inside the at least one stator and along the rotation axis of the rotation shaft; and a blower external to the housing for feeding the cooling air to the air intake port such that the cooling air flows through the housing from the housing first end to the housing second end through the holes formed inside of the at least two rotors and/or inside the at least one stator and along the rotation axis of the rotation shaft and exits the housing via the air exhaust port, wherein the permanent magnet rotating machine is an axial gap type and configured to be driven by magnetic force of the permanent magnets, and among the permanent magnets, each permanent magnet near the housing second end has a higher coercivity than each permanent magnet near the housing first end.