100 krpm~10 kW高速永磁电机转子系统的设计与校核研究

A Study on Design and Check for a Rotor System of a 100 krpm~10 kW High-Speed Permanent Magnet Motor

本文研究的目的是开发一台额定功率为10 kW、最高转速为100 krpm的燃料电池空压机用高速永磁同步电机。针对永磁电机在超高转速下存在的离心应力过大导致永磁体拉伸变形失磁,以及细长转子在高速下容易发生扭转共振问题,本文重点研究高速转子系统的设计与校核。通过有限元分析研究了护套过盈量和厚度对转子部件应力应变的影响,确定了永磁体与护套之间的最佳过盈量与保护套厚度。转子系统的高速模态分析结果表明,转子系统的一、二阶临界转速远大于电机的最高工作转速,设计的电机转子系统在高速运行时不会发生扭转共振现象。

The purpose of this paper is to develop a high-speed permanent magnet synchronous motor for a fuel cell air compressor with a rated 10 kW, maximum speed of 100,000 rpm. Aiming at the excessive centrifugal stress of permanent magnet motor at ultra-high speed, the permanent magnet tensile magnetization deformation and the torsion resonance of slender rotor at high speed, this paper focuses on the design and calibration of high-speed rotor system. The effect of the sheath surplus and thickness on the stress strain of the rotor component is studied by finite element analysis, and the optimal surplus and the sheath thickness between the permanent magnet and the sheath are determined. The results of high speed modal analysis of the rotor system show that the first and second critical speeds of the rotor system are much greater than the highest operating speed of the motor, designed motor rotor system will not have torsional resonance phenomenon at high speed.