RING MAGNET, ITS MANUFACTURING METHOD, AND ROTOR AND MOTOR USING THIS RING MAGNET

摘要

PROBLEM TO BE SOLVED: To provide a ring magnet capable of realizing both of the reluctance torque and low cogging torque of a polar anisotropy magnet by using the difference between magnetic reluctance, by providing the difference of the magnetic reluctance in a circumferential direction of the ring magnet, and to provide its manufacturing method, and a rotor and a rotating machine using the ring magnet.

SOLUTION: In this ring magnet, a plurality of soft magnetic materials are integrally formed in annular rigid magnetic material of which the easy magnetization direction periodically varies in a circumferential or diametrical direction at a certain interval in the circumferential direction. This manufacturing method of the ring magnet has a forming process of a compound body in which the plurality of soft magnetic materials are disposed at a certain interval in the peripheral direction in the rigid magnetic material particulates disposed in a ring shape, a pressure forming process in which a pressure forming body is formed while the compound body is disposed in a magnetic field, and a sintered process in which the press forming body is sintered.

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