The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 2019
Filed:
Nov. 13, 2015
Fuji Electric Co., Ltd., Kawasaki-shi, JP;
Toshiharu Mochida, Fujimi, JP;
Takashi Sakiyama, Kuwana, JP;
Masao Shuto, Suzuka, JP;
Toshiya Sasaki, Suzuka, JP;
Hirofumi Nishimura, Suzuka, JP;
Takeshi Iwamoto, Suzuka, JP;
Yuji Nakazaki, Suzuka, JP;
Takasumi Chikazawa, Tsu, JP;
Keizou Kato, Nagoya, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, JP;
Abstract
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.