关键词: 高速永磁电动机, 过盈配合, 合金护套, 强度分析, 超速试验

Abstract:

According to the analysis of rotor strength of high-speed permanent magnet motor for centrifuge, based on the theory of elastoplastic mechanics, the analytical expression of high-speed rotor strength design was derived, and the explicit stress evaluation criteria were given.In the process of calculating the interference,considering the influence of temperature factors,an effective calculation of the high-speed rotor interference and the minimum thickness calculation method of the sleeve were studied.The permanent magnet synchronous motor with rated speed of 40 000 r/min was used to calculate the radial stress, tangential stress and equivalent stress of the alloy sleeve and permanent magnet by the analytical algorithm and finite element method.The calculation of two methods was carried out and the maximum deviation of the results was less than 2%,which is suitable for engineering applications.The results of the over-speed test show that the high-speed permanent magnet rotor designed according to the proposed method has sufficient mechanical strength.

Key words: high-speed permanent magnet motor, interference fit, alloy sleeve, strength analysis, over-speed test