Magnetic field analysis and structure optimization of high speed EEFS machine

The structure of the motor and the pattern of windings have great influence on the electrical excitation flux-switching (EEFS) motor. This paper developed a 200KW EEFS machine in the light of drive motors of the high power air conditioning compressor, and introduced the operate principle and basic parameters of the motor. The EEFS machine was optimized through FEM analysis and simulated with Maxwell 2D in a comprehensive consideration of performance indexes such as rated voltage and power. By changing basic sizes of the motor, electromagnetic performances, loss and efficiency of different structures of EEFS machine were compared to get the most suitable structure, and a proposal of radial distribution was given. The performance included the phase flux-linkage, back electromotive force (EMF) waveforms, no load characteristics and load characteristics, etc. The results provided theoretical basis of the development of high reliability of the doubly salient motor.