Patent ID: 9484790
Filing Date: 2016-11-01
CPC Classification: H02K,Y10T

Claim Text:
1. A rotor for an electric rotating machine, the rotor comprising: a hollow cylindrical rotor core having a plurality of magnet-receiving holes formed therein, each of the magnet-receiving holes having a plurality of wall surfaces including a radially innermost wall surface which is positioned radially innermost among the plurality of wall surfaces; and a plurality of magnets each of which is received in a corresponding one of the magnet-receiving holes of the rotor core, wherein each of the magnets is arranged in the corresponding magnet-receiving hole so that among thermal resistances between the magnet and the plurality of wall surfaces of the corresponding magnet-receiving hole, the thermal resistance between the magnet and the radially innermost wall surface of the corresponding magnet-receiving hole is lowest, wherein each of the magnets is retained by a corresponding retaining member in the corresponding magnet-receiving hole of the rotor core so as to abut the radially innermost wall surface of the corresponding magnet-receiving hole, and wherein the rotor core comprises n rotor core pieces, each of the magnets comprises n magnet pieces, and each of the retaining members corresponding to the magnets comprises n retaining member pieces, where n is an integer greater than or equal to 2, each of the rotor core pieces has formed therein a plurality of magnet piece-receiving holes each of which makes up part of one of the magnet-receiving holes of the rotor core, the rotor core, the magnets and the retaining members are together provided in the form of an assembly, the assembly comprises n sub-assemblies that are stacked in an axial direction of the rotor core, each of the sub-assemblies includes one of the rotor core pieces and a plurality of the magnet pieces each of which is retained in a corresponding one of the magnet piece-receiving holes of the rotor core piece by a corresponding one of the retaining member pieces.