开关磁阻电机的非线性建模转矩估计研究

Research On Torque Estimate of Nonlinear Model for Switched Reluctance Motors

开关磁阻电机(SRM)的双凸极结构使其电磁特性呈高度非线性,本文在对SRM磁化特性曲线(θ,i)分析的基础上,采用了一种倒数函数来建立SRM模型的方法。在获得SRM特殊转子位置处的磁链数据点的基础上,利用傅里叶级数分解和倒数函数来拟合SRM磁链特性,进而推导出电磁转矩模型。本文借助Matlab软件,搭建了开关磁阻电机直接瞬时转矩控制(DITC)的非线性建模转矩估计系统模型,并进行了仿真,仿真结果表明该模型能很好反映实际的电磁转矩,验证了所建模型的准确性和有效性。

Double-salient structure of Switched Reluctance Motor（SRM） makes its electromagnetic characteristic highly nonlinear. By a analysis of magnetising curves （θ, ）, the paper provided an reciprocal function to modle the SRM. The proposed model was built with data points at rotor positions, which utilized theFourier series in expression of current with reciprocal function. The torque models was also proposed from the fitting curve of flux linkage. This paper made use of the Matlab software, set up a switched reluctance motor direct instantaneous torque control （DITC） nonlinear modeling torque estimation system model, and the simulation results show that the model can well reflect the real electromagnetic torque, demonstrate the effectiveness and accuracy of the model.