中文摘要：

为了研究气隙磁动势对电机性能和控制策略的影响，运用傅里叶分析和绕组函数的方法，推导五相永磁同步电机通入脉冲电流时绕组磁动势的数学表达式，揭示绕组中各次谐波电流所产生的谐波磁动势在幅值、频率和转速上的分布规律。在旋转坐标系下，建立含有三次谐波绕组的五相永磁同步电机的数学模型，并对三次谐波电流注入比的选取进行计算。计算结果表明，在不增加功率变换器容量的前提下。通过注入一定的三次谐波电流，可以在提高电机输出转矩的同时，降低电机定子铁心的磁饱和程度，提高电机的效率。

英文摘要：

To study the impact of air-gap magnetic motive force （MMF） on motor performance and con- trol strategies, the mathematical expressions of winding MMF was derived by adopting Fourier analysis and winding function method, when the five-phase permanent magnet synchronous motor （PMSM） was supplied with pulse current. In the meantime, the distribution regularity of harmonic MMF on am- plitude, frequency and speed was revealed. The mathematical model for five-phase PMSM with third harmonic winding was established in the rotating coordinate system. The injection ratio of third harmonic current was calculated. Calculation results prove that by injecting third harmonic current, not only is the motor output torque enhanced, but also the magnetic saturation of stator core is reduced.