This paper proposes new-shaped pole pieces for a low-speed rotor of a magnetic-geared generator, which unify a magnetic gear and a generator and can realize downsizing and maintenance-free operation for large output power machines such as a 2-MW class used for wind power generations. The concept of the new-shaped pole pieces is described, and its effectiveness is verified by finite element analysis and measurements on a prototype downsized in 1-kW class.
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