The authors designed a rotor structure of permanent magnet synchronous machine (PMSM) to develop a large output power by the proposed topology optimization method. As the obtained magnet shape is complex and less practical, this paper proposes a rotor topology of PMSM considering ease of manufacturing. Finite element simulation confirms that the average output power of the designed machine is higher than that of a generator used in Prius under the condition of the same stator, the same weight of rotor and the same permanent magnet volume.
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