关键词: 隐极式高速永磁电机, 过盈, 实心磁钢, 转子强度, 超速实验

Abstract: Aiming at the rotor strength problem of non-salient pole high speed permanent magnet motor, the analytical expression for the strength design of high speed solid magnet rotor were derived, and an effective engineering calculation method for the interference of such high-speed rotors was proposed. Taking a 10 kW permanent magnet synchronous motor with rated speed of 60 000 r/min as the research object, the stress of each part of the rotor was analyzed and calculated by the analytical method and the finite element method respectively, and the calculation deviation of the two methods was less than 2%. The results showed that the radial and tangential stresses of the solid magnet rotor increased with the increase of the radius of the magnet.At the center of the permanent magnet, the radial and tangential stresses were equal. With the increase of the radius, the tangential stress began to be less than the radial stress.The no-load overspeed test of the prototype was carried out, and the results showed that the strength of the high-speed permanent magnet rotor based on this method met the design requirements.

Key words: non-salient pole high speed permanent magnet motor, interference fit, solid magnet, rotor strength, over-speed test