Abstract For interior permanent magnet synchronous motors driven by inverters, most studies focus on the effect of the common mode voltage on the bearing voltage, ignoring the shaft voltage caused by asymmetric magnetic fields. Regarding the shaft voltage under dynamic eccentricity fault, the expression is deduced by the analytical method, and the characteristic frequency is analyzed. Then, the method of reducing the eccentric shaft voltage is studied by changing the pole-arc coefficient of rotor poles. Finally, four eccentric shaft voltage models with different pole-slot combinations including 4p6s, 2p9s, 4p9s and 8p9s are established. The effectiveness of analytical analysis is verified by the finite element method. The simulation results show that the eccentric shaft voltage can be weakened by reducing the inherent shaft voltage. And the eccentric shaft voltage at 40% eccentric degree is reduced by 59.05%, 26.90%, 43.31%, 22.60%, respectively.
Zhao Fangwei,Wang Xiuhe,Zhao Wenliang等. Analysis and Reduction of Shaft Voltage in Interior Permanent Magnet Synchronous Motors under Dynamic Eccentricity Fault[J]. Transactions of China Electrotechnical Society, 2022, 37(4): 837-848.
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