Active magnetic bearing for a liquid nitrogen pump

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Kamioka, Yasuharu^1 ; Kajikawa, Kazuhiro^2 ; Hirai, Hirokazu^3 ; Ozaki, Shinsuke^3 ; Nakamura, Taketsune^4 ; Imagawa, Shinsaku^5 ; Ishiyama, Atsushi^1

Waseda University, Shinjuku-ku, Tokyo

169-8555, Japan^1

Kyushu University, Nishi-ku, Fukuoka

819-0395, Japan^2

Taiyo Nippon Sanso Corp, Ibaragi, Tsukuba

300-2611, Japan^3

Kyoto University, Nishikyo-ku, Kyoto

615-8520, Japan^4

National Institute for Fusion Science, Toki, Gifu

509-5292, Japan^5

关键词: Active Magnetic Bearing;    Design speed;    High speed motors;    HTS cable;    HTS motors;    Maintenance intervals;    Radial bearings;    Rotation speed;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012153/pdf
DOI  :  10.1088/1757-899X/502/1/012153

来源: IOP

【 摘 要 】

The development of a liquid nitrogen submerged pump for HTS applications is underway. A cryogenic active magnetic bearing is the main component of the pump. The bearing makes the maintenance interval of the pump longer than 3years such interval is essential for the pump in commercial use of HTS applications such as long HTS cable. The bearing will be set in a HTS motor shaft of the pump. In experiments, a shaft without an HTS motor is used and the bearing was immersed in liquid nitrogen. The rotation of the shaft is made by a high-speed motor at room temperature. The bearing consists of two radial bearings and one axial bearing. The shaft was floating by the bearing and was rotated by the motor at room temperature. The steady rotation speed of 2,000, 3,000, 4,000 and 5,000 rpm were achieved, and the rotation speed satisfied the design speed of the pump which is 5,000rpm.