Hitachi, Ltd.

Izuru Yasuda

Kunio Miyashita

Hironori Okuda

A synchronous motor is provided with a rotor including magnetic poles composed of a permanent magnet fixed around a rotor shaft, a stator facing the outer periphery of the rotor with an air gap formed therebetween, and a guard ring made of a non-magnetic material of low resistivity and fitly disposed around the outer periphery of the permanent magnet to restrain the surface loss caused by the magnetic flux linking with the guard ring, thereby preventing the reduction of the efficiency of the synchronous motor.

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Hitachi, Japan

Izuru Yasuda