1. China University of Petroleum(East China) Qingdao 266580 China 2.Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China
Abstract：Comparing to the surface-mounted permanent magnet synchronous motor(PMSM), motors with salient effect have the advantages of much more compact structure, higher torque(or power)-density, but with much stricter requirements to vibration and acoustic noise. To solve this problem, electromagnetic force wave mathematic models of the PMSMs for electric vehicles(EV) are deduced and the influential factors of frequency and orders of electromagnetic force wave are analyzed in this paper. Moreover, mechanical finite element analysis(FEA) is used to obtain the modal shape and frequency characteristics of prototype motor. Finally, vibration and acoustic noise characteristics of prototype motors at high speed are measured and numerically analyzed; comparisons are also made between estimated modals and experiment results. The results validate the good consistency between the radial electromagnetic force wave model, modal analysis and experimental measurements. Also, different carrier frequencies are researched to obtain the impact of PWM excitation on the vibration characteristics.
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2012, Vol. 27 
