Kabushiki Kaisha Meidensha

Kandenko Co., Ltd.

Sumitomo Wiring Systems, Limited

Masanori Miyamoto

Kenichi Okada

Hirotugu Kinoshita

Fumihiro Itano

Yoshinao Okawa

Yoshihiro Murano

Kiyohito Mizuide

Takeshi Uesugi

Kazuo Funabashi

Isao Ito

Yasuhiko Onishi

Makoto Noda

Shuzo Tanigaki

Masaaki Hoko

Kiyoshi Nagasawa

Yoshiyuki Ema

The invention relates to a rotating electric machine including a coil of a wire having thereon an insulating coating comprising a polybenzimidazole. This rotating electric machine is stably maintained for a long time in dielectric strength even under a highly radioactive environment, due to the use of the special insulating coating. With this, the rotating electric machine can be driven stably for a long time. The invention further relates to another rotating electric machine including (a) a rotor having a rotating shaft; (b) a bearing for supporting the rotating shaft; and (c) a grease applied to the bearing. This grease contains (1) a polyphenyl ether having at least three aromatic rings in the molecule and (2) a urea. The rotor of this rotating electric machine is stably supported in the bearing for a long time even under a highly radioactive environment, due to the use of the special grease. Thus, this rotating electric machine can also be rotated stably for a long time.

Rotating electric machine usable in radioactive environment

The invention relates to a rotating electric machine including (a) a rotor having a rotating shaft; (b) a bearing for supporting the rotating shaft; (c) a radiation resistant grease applied to the bearing; and (d) a shield layer for shielding the grease from radiation. The shield layer is made of lead and surrounds the bearing. The shield layer includes (1) a first cylindrical shield member that is positioned to cover the bearing, such that the bearing is shielded from a first radiation that is in a direction substantially perpendicular to an axis of the rotating shaft, and (2) second and third disk shield members that are positioned to interpose therebetween the bearing in a direction along the axis of the rotating shaft, such that the bearing is shielded from a second radiation that is in a direction substantially along the axis of the rotating shaft. Thus, the rotor of this rotating electric machine is stably supported in the bearing for a long time even under a highly radioactive environment. That is, the rotating electric machine can be rotated stably for a long time.

Growing community of inventors

Ibaraki, Japan

Masanori Miyamoto