基于高频脉冲注入法的开关磁阻电机母线电流分解

Busbar Current Decomposition for Switched Reluctance Motor Based on High-frequency Pulse Injection Method

传统的开关磁阻电机相电流采样技术是在每相绕组中分别放置1个电流传感器,这样不但增加了系统成本,而且降低了系统的可靠性。对传统不对称半桥变换电路的连接方式稍作改变,提出将高频脉冲注入开关磁阻电机母线电流中分解出各相电流的技术。该采样方法减少了电机调速系统中电流传感器的数量,降低了系统成本,使系统运行更加可靠。最后搭建了三相12/8极的开关磁阻电机系统仿真模型和实验平台,仿真分析与实验结果验证了所提分解母线电流方法的有效性、正确性。

In the traditional phase current sampling technique for a switched reluctance motor ( SRM ), one current sensor is placed in each phase winding, which increases the system cost and reduces the system reliability. In this paper, a small modification is made to the circuit connection mode of the traditional asymmetric half-bridge converter, i.e., each phase current is decomposed from busbar current by injecting high-frequency pulse to the SVM. Using this method, the number of current sensors in the speed regulation system is reduced, thus reducing the system cost and making the system operate more reliably. Finally, a simulation model and an experimental platform of a three-phase 12/8 pole SRM system were set up. The effectiveness and validity of the proposed busbar current decomposition method were verified by simulation analyses and experimental results.