阻尼绕组对直接转矩控制同步电机动态行为的影响

Effect of Damper Windings on the Dynamic Performance of Electrically Excited Synchronous Motor Based on Direct Torque Control

目前电励磁同步电机直接转矩控制研究在中国还是一个空白,其转子上存在阻尼绕组,必然对电机的动态行为产生影响。本文详细推导并分析了电励磁同步电机中电磁转矩与转矩角关系式,在此基础上结合仿真方法研究了阻尼绕组对直接转矩控制同步电机动态行为的影响。结果指出,在主转矩角为零点附近主转矩与主转矩角的变化趋势始终一致;交轴阻尼绕组能有效地抑制动态中转矩及转速振荡幅度;直轴阻尼绕组对改善系统动态性能不明显,且该绕组的存在易引起系统的不稳定。从改善系统的动态特性出发,转子上不宜设置直轴阻尼绕组。

Research on electrically excited synchronous motor （ESM） based on direct torque control（DTC） in China at present is still a vacancy. Damper windings mounted in the rotor of ESM affect the dynamic performance of motor inevitably. In this paper the relationship between torque and torque angle in ESM of DTC is firstly deduced detailedly, and then the effects of damper windings on the dynamic performance of ESM based on DTC are presented by digital simulation. The results of simulation show that the derivative of the main torque near the zero cross is positive with respect to the main torque angle. The q-axis damper winding can reduce the oscillation amplitude of the torque and speed significantly, and the d-axis damper winding improves the dynamic performance of the motor slightly and decreases the system＇s stability. So the d-axis damper winding is unnecessary.