Anisotropic magnet brushless motor having a rotor with elastic insulating support structure
AssigneesHitachi, Ltd., Hitachi Car Engineering Co., Ltd.
InventorsYoshinori Fukasaku, Mitsuaki Mirumachi, Hideo Tatsumi
Life of this patent
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Abstract
A permanent-magnet type brushless motor has a rotor which is made by integrally forming a rotating magnetic pole comprising a cylindrical multi-pole anisotropic magnet, a shaft and an elastic insulating supporting member having rigidity lower than at least that of the shaft. The multi-pole anisotropic magnet causes its magnetic flux to flow to form the closed magnetic circuit, thereby eliminating the necessity of forming the closed magnetic circuit using an inner stator core in the magnet required for the radial anisotropic magnet. A cylindrical casing holding therein a stator core.
Claims8
A permanent-magnet brushless motor comprising:
- a rotor having a rotating magnetic pole formed by a cylindrical multi-pole anisotropic magnet fixedly coupled and integrally molded to a shaft by means of insert molding of an integrally formed elastic insulating supporting member made of an electrically insulated material which has a rigidity which is lower than at least a rigidity of the shaft;
- and
- a cylindrical casing having a stator core mounted therein;
- wherein,
- said cylindrical casing is made of a resin;
- a stator coil wound around the stator core is of a coil insulating kind, and has a flash point temperature that is lower than a flash point temperature of an insulating resin member provided between a lowest layer of the coil and the stator core, and lower than a flash point temperature of the cylindrical resin casing;
- and
- said rotor shaft has an irregularly contoured circumferentially disposed surface area on which said rotating magnetic pole is integrally molded.
A permanent-magnet brushless motor comprising:
- a rotor having a rotating magnetic pole formed by a cylindrical multi-pole anisotropic magnet fixedly coupled and integrally molded to a shaft by means of insert molding of an integrally formed elastic insulating supporting member made of an electrically insulated material which has a rigidity which is lower than at least a rigidity of the shaft;
- and
- a cylindrical casing having a stator core mounted therein;
- wherein,
- said cylindrical casing is made of a resin;
- and
- a stator coil wound around the stator core is of a coil insulating kind, and has a flash point temperature that is lower than a flash point temperature of an insulating resin member provided between a lowest layer of the coil and the stator core, and lower than a flash point temperature of the cylindrical resin casing.
Dependencies are inferred from the claim text.