开关磁阻电机转矩脉动与铜耗最小化控制研究

Torque ripple and copper losses minimization control study of switched reluctance motor

针对开关磁阻电机(switched reluctance motor,SRM)的双凸极结构导致其运行时产生很强的转矩脉动现象,根据SRM非饱和特性下电感与角度关系曲线,提出一种基于指数函数的SRM转矩脉动与铜耗最小化转矩分配综合控制方法,该方法综合转矩计算式和查表法将参考转矩直接转化为参考电流,避免了对转矩的测量。与正弦转矩分配控制进行比较分析,在电机工作效率方面验证了该控制系统性能的优越性;提出将转矩脉动抑制作为主要优化对象,抑制定子绕组换相电流作为次级条件,利用加权函数实现转矩脉动抑制与运行效率的优化平衡方案。以一台3 kw的12/8极开关磁阻电机为控制对象,建立控制系统仿真模型,验证了方案的有效性。

Torque-ripple of switched reluctance motor（ SRM） is inevitable for its double saliency construction and switch power supply. To minimize the torque-ripple,according to unsaturation inductanceangle characteristics curve of the SRM,a torque distribution synthesis control method based on exponential function to decrease SRM torque ripple and copper losses was proposed. The reference torque was directly translated into the reference current using the torque formula and lookup table method to avoid the torque measure. Meanwhile,the proposed method was compared with the traditional sinusoidal torque distribution control method. The results show its superiority of the operational efficiency. The optimal balance scheme employing weighting function of torque ripple minimization and operational efficiency was proposed by setting torque ripple minimization as the major optimal object,reducing the stator winding commutation current as a secondary condition. The control system simulation model of a 3kw 12 /8 poles switched reluctance motor was built to verify the validity of the proposed method.