异步交流电机动态数学模型分析与研究

摘要

异步交流电动机在运行中，内部磁场相互作用构成了一个强耦合、高阶次的时变系统，创建异步交流电动机的动态模型比较复杂。有些文章为了简化系统模型，在建立电机模型时忽略了电机铁耗，但当电机在剧烈负载情况下，电机由于内部磁场变化剧烈，电机定转子铁耗会急剧增大，此种模型会产生较大的误差，使仿真结果不具说服力。为了验证这种想法，分别建立了一种带铁耗电机数学模型以及忽略铁耗的电机数学模型。利用了Matlab/Simulink对已建数学模型编写框图，并分别作出了两种模型动态响应曲线。最后，通过对比两种模型的仿真曲线，得出了在剧烈负载时，忽略铁耗的电机模型存在较大误差的结论。%When asynchronous ac motor is working,electromagnetic fields affect each other and constitute a strong-cou-pling and high-order time-varing system. It is complex to build a dynamic mathematical model of asynchronous ac mo-tor. To modify the asynchronous ac motor model, some papers ignore the iron loss when build the motor model. But in some conditions which load of motor is severe, due to the magnetic field changes very fast, the iron loss increases quickly,so the model ignoring iron loss will exist large error. And this is only a idea. To verify the idea,I built two asynchronous ac motor model, one with iron loss, another without iron loss. Simulated the established models with matlab/simulink. At last, compared the two simulated curves got the conclusion that the model ignoring iron loss will induce large error at severe load condition.