The temperature rise of the high-speed permanent magnet synchronous machine ( PMSM ) for aviation aircraft supplied by PWM voltage might be significant because of its high loss density and poor heat dissipation condition. What's worse, high temperature increases the demagnetization risk of Halbach-array magnets, which impairs the reliability of operation. In allusion to above problems, a multi-objective optimization method of high-speed PMSM based on Nelder-Mead algorithm is proposed. The loss and temperature rise are selected as optimization objectives. Field-circuit coupled finite element analysis method is used to calculate the loss of the machine powered by T-type three-level converter, thus calculating the temperature rise. The optimal design areas are searched by using the optimization algorithm, and the optimal solution is achieved. The flux density distribution and eddy current loss in the Halbach-array magnet are analyzed, and then the design of magnets is optimized to suppress eddy current loss and demagnetization. A 300 kW, 30000 r/min high-speed PMSM was designed and manufactured. Simulated and experimental results show that the proposed design method could realize multi-objective optimization and suppress demagnetization effectively.
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