Hitachi, Ltd.

Keizi Noma

Akira Saruta

Masaharu Senoo

Masanori Yoshizaki

Kouei Yaegashi

Koichi Teshirogi

A novel rotor construction is disclosed, in which plural permanent magnets are arranged on the outer periphery of a rotor core, which are protected with a cover, and in which a member is placed at an axial end of the rotor core cast with end rings with a balance weight on the outside thereof. The protective cover protects the outer peripheries of the end rings and dampens the centrifugal force of the balance weight. Projections provided on the outer periphery of the member are located at the center of the permanent magnets to reduce the leakage magnetic fluxes between the permanent magnets.

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Funabashi, Japan

Keizi Noma