分析了永磁同步电机（PMSM）空载反电动势对功率因数的影响。分别建立了PMSM空载反电动势对单传动和多传动变频器影响的数学模型。计算结果表明，多传动结构的变频器既能容许更高的PMSM空载反电动势，又可以显著提高传动系统效率。

The influence of no-load back electromotive force (EMF) of permanent magnet synchronous motor (PMSM) on power factor is analyzed. The mathematical models of the influence of the PMSM no-load back EMF on single-drive and multi-drive converters are established. The calculation results show that the converter with multi-drive structure can tolerate higher no-load back EMF of PMSM, and significantly improve the efficiency of the driving system.

湖南创新型省份建设专项经费项目（2019GK1011）