三次谐波注人式五相永磁同步电机DTC

DTC for Five-phase PMSM With Third Harmonic Injection

为了提高五相永磁同步电机(PMSM)的转矩密度,给出了含有3次谐波磁场的凸极式五相PMSM在3种坐标系下的数学模型,揭示了绕组中3次谐波电流与3次谐波磁场相互作用可以产生恒定的电磁转矩。此外,提出了一种基于基波空间和3次空间的双坐标空间的直接转矩控制(DTC)策略。实验表明,该策略实现了基波转矩及磁链、3次谐波转矩及磁链的同时控制,系统动态响应迅速。

In order to improve the torque density of five-phase permanent magnet synchronous motor（PMSM）,a mathematical model of the five-phase PMSM with third harmonic injection is established in three coordinate systems.It is revealed that the third harmonic currents in the winding interact with the third harmonic magnetic field to produce a constant electromagnetic torque.In addition, a direct torque control（DTC） strategy based on the fundamental space and the third space is proposed.Experimental results show that the proposed strategy achieves simultaneous control of fundamental torque and flux and third harmonic torque and flux,and the system responds quickly.