关键词: 低温泵, 高速永磁电机, 多物理场, 转子强度分析

Abstract: The rotor of a high-speed and low-temperature centrifugal pump motor is immersed in low-temperature fluid during operation. In addition to the centrifugal force caused by rotation, it also withstands the influence of low-temperature fluid. The design method of a conventional motor dosen ’ t consider the influence of low-temperature fluid. An electromagnetic model of the motor was established and the losses of the motor rotor in low-temperature environments were
analyzed. A three-dimensional model of the low-temperature pump motor rotor and external flow field was constructed, and thermal fluid-structure coupling analysis was carried out from multiple physical fields. The temperature distribution of the fluid inside the motor cavity and the stress distribution of the rotor in the low-temperature immersion environment were obtained. The coupling analysis of multiple physical fields had obtained the fluid distribution law in the air gap and the force and temperature distribution law of the motor rotor in a low-temperature environment, which has reference significance for the design of low-temperature rotors.

Key words: cryopump, high-speed permanent magnet motor, multi-physics fields, rotor strength analysis