三相逆变桥驱动开关磁阻电机的研究

Research of three phase inverter bridge supply SRM

将三相开关磁阻电动机绕组采用星型连接,用三相逆变桥对其驱动,采用传统的控制方式运行状况不佳。本文根据开关磁阻电动机产生电磁转矩的原理,分析了每相自感和两相互感在电动机运行中产生电磁转矩的情况,根据其变化规律,推导出独特的720°电角度一周期的对称不均匀励磁方式,使磁阻电动机获得了良好的运行效果,解决了传统三相开关磁阻电机与驱动电源连接线过多的问题。本文结合样机,对励磁方式进行了理论分析,并以实验进行验证。

A star type connection is adopted on a three phase SRM (Switched Reluctance Motor), supplied with a three phase inverter bridge. It could not get good result with traditional control methods. According to the principle of SRM's electromagnetic torque, this paper analyzed its self-inductance and mutual-inductance's effect on electromagnetic torque. With the rule of their variation, this paper used special symmetric and uneven excitation mode with 720°electric angle a cycle, and good result was obtained. It can solve the problem of excessive connecting lines between SRM and power supply. Based on the sample motor, this paper analyzed the excitation mode theoretically, and the result was validated with experiment.