[APP2] Magnets, Electric power devices, Rotating machines

[APP2-17] Thermal performance of the cryo-rotary joint for cooling system of the HTS rotating machine under 2000 rpm

Kota Yamaguchi¹, *Kosei Hisada¹, Taiki Kobayashi¹ (1. National Institute of Technology, Toba college (Japan))

Keywords:

Cryogenic,HTS rotating machine,cooling system

High Temperature Superconducting (HTS) rotating machines are widely used in an electric propulsion system for aircraft and a transfer pump for cryogenic cargo at ships. According to the development of HTS rotating machines, a cooling system for them is required to maintain the operating temperature at high-speed rotating conditions such as over 4000 rpm. A cryo-rotary joint is one component of the cooling system for HTS rotating machines, and it is necessary to provide the coolant for the HTS part in the rotor. It can also has a function to separate the static part and rotating part such as a bearing. Moreover, the cryo-rotary joint maintains the airtight because the inside of HTS rotating machine have to maintain the evacuation condition from standard point of preventing the heat invasion. However, high-speed rotating makes a huge heat in the cryo-rotary joint, and it affects cooling performance and maintaining the airtight. To solve this problem, we have developed the cryo-rotary joint. In this presentation, we made new cryo-rotary joint. And it was tested under high-speed rotation. Firstly, the heat invasion from heat generation part to cryogenic part was analyzed by COMSOL and confirmed by the experiment using the liquefied nitrogen. As a result, the heat invasion of the new cryo-rotary joint was determined 1 W. The new cryo-rotary joint was evaluated with a rotating test up to 2000 rpm using liquid nitrogen.