Patent ID: 9030072
Filing Date: 2015-05-12
Classification: H02K

Abstract:
1. A rotor for an electric rotating machine, the rotor comprising: a rotor core having a plurality of slots formed therein, the rotor core also having a circumferential surface that extends in a circumferential direction of the rotor core; and a plurality of permanent magnets each of which is received in a corresponding one of the slots of the rotor core, wherein the rotor is configured to be rotatably disposed in the electric rotating machine with the circumferential surface of the rotor core facing a stator of the electric rotating machine, when viewed along an axial direction of the rotor core, each of the permanent magnets has a plurality of corner portions among which a first corner portion is positioned closest to the circumferential surface of the rotor core, each of the permanent magnets also has a plurality of side surfaces including a first side surface that intersects an imaginary line, faces toward the stator side and makes up part of the first corner portion of the permanent magnet, the imaginary line extending in a magnetization direction of the permanent magnet through a center of the permanent magnet, for each of the permanent magnets, there are formed, between the first side surface of the permanent magnet and an inner surface of the corresponding slot of the rotor core, a first gap, a second gap and an abutment area from the first corner portion side in this order, the first and second gaps both separate the first side surface of the permanent magnet from the inner surface of the corresponding slot of the rotor core and communicate with each other, at the abutment area, the first side surface of the permanent magnet and the inner surface of the corresponding slot of the rotor core abut each other, portions of the inner surface of the slots, which define the first gap, the second gap and the abutment area, are all parallel to the first side surface of the permanent magnet; and the first gap has a smaller width than the second gap in a direction perpendicular to the first side surface of the permanent magnet.