To ensure the safe and stable operation of high-speed permanent magnet machines (HSPMMs) under the constraints of multiphysics performances, a 160kw, 21000rpm HSPMM was used as an example. The 2D electromagnetic model and 3D mechanical model was established. The sensitivity analysis of rotor parameters to multiphysics performances is performed based on the finite element method (FEM). On this basis, a multi-objective optimization scheme of the rotor for the HSPMM based on Kriging model was proposed. The multi-objective genetic algorithm (MOGA) is chosen as the optimization method to obtain the design scheme of the high efficiency and low temperature. Compared with the initial scheme of the HSPMM, the eddy current loss of the rotor is reduced by 49%, the maximum temperature of the rotor is decreased by 7.6℃, and the efficiency of the machines is increased by 0.3%. This paper provides a reference for the multiphysics optimization design of HSPMMs.

Kriging model,High-speed permanent magnet machine,Multiphysics,Optimization,Sensitivity analysis