Fuji Electric Co., Ltd.

Yuji Nakazaki

Hirofumi Nishimura

Toshiharu Mochida

Masao Shuto

Toshiya Sasaki

Keizou Kato

Takashi Sakiyama

Takeshi Iwamoto

Takasumi Chikazawa

Cracking and flying around of permanent magnets in a permanent magnet embedded-type rotating electric machine is prevented. Thermally hardening FRP is used as a reinforcement sheet, and the reinforcement sheet is wrapped around the periphery of a permanent magnet and caused to adhere to the surface of the permanent magnet by being thermally hardened. Subsequently, the permanent magnet to which the reinforcement sheet is adhering is embedded in magnet embedding holes of the rotor. The surface of the reinforcement sheet after thermal hardening is in a state of not being attached to the inner wall surface of the magnet embedding holes. Consequently, no stress caused by the difference between the linear expansion coefficients of the rotor and permanent magnets acts on the permanent magnets when the temperature of the rotor rises, and cracking of the permanent magnets can thus be prevented.

Permanent magnet embedded-type rotating electric machine and manufacturing method thereof

Growing community of inventors

Suzuka, Japan

Yuji Nakazaki