基于查表法的电励磁双凸极电机建模研究

为了研究电励磁双凸极电机(DSEM)的控制策略，必须建立精确控制模型。DSEM定转子均为双凸极结构，存在明显的边缘效应和高度的局部饱和现象，其磁链和转矩均为电枢电流、励磁电流及转子位置角的非线性函数，难以采用常规方法建立精确控制模型。在深入分析电机电磁特性的基础上，通过有限元仿真分别建立磁链与转矩关于电流与转子位置角关系的数据表。采用Simulink三维查表法，分别对DSEM磁链函数和转矩函数进行建模，并与电压方程一起构成DSEM仿真模型。针对模型各个环节进行了分析验证，以励磁绕组滞环斩波空载反电动势及电枢电流采用不对称控制策略为例，将仿真结果与有限元仿真及试验结果进行了对比，验证了所建模型的精确性、有效性及建模方法的可行性。

Modeling of Doubly Salient Electro-Magnetic Motor Based on Look-Up Table Method

In order to analyze the control strategy of doubly salient electro magnetic motor (DSEM), it is necessary to establish an accurate control model. The stator and rotor of DSEM are both doubly salient structure, which has obvious edge effects and high local saturation. The flux linkage and torque of the motor are both nonlinear functions of armature current, excitation current and rotor position angle. Therefore, it is difficult to establish accurate control model by conventional methods. Based on the in depth analysis of the electromagnetic characteristics of the motor, the data table of flux linkage and torque about the relationship between current and rotor position angle is established by finite element simulation. The flux linkage and torque model functions of DSEM are built by using the three dimensional look up table Simulink method, which is then used to establish the simulation model of DSEM together with the voltage equation. All aspects of the model are analyzed and verified. Taking the no load back electromotive force (EMF) of hysteresis chopping of excitation winding and asymmetric control strategy for armature current as an example, the simulation results are compared with the finite element simulation and experiment. The results verify the accuracy, effectiveness and feasibility of the model.