单变换器双开关磁阻电机系统的同步运行分析与控制

To reduce the space and the cost of multiple power converters in multimotor systems, this article focuses on the single-converter dual-switched reluctance motor (SRM) system. Based on the mathematical model of SRM and the inductance characteristics relationship of the dual SRMs, the inherent behavior of phase current self-regulation in a single-converter dual-SRM system is introduced, where the dual SRMs can spontaneously regulate their phase current to overcome the unbalanced load. However, when the unbalanced load is further expanded, the dual-SRM system is prone to collapse due to its expanded position difference. For this, several synchronous control strategies are proposed based on the behavior of phase current self-regulation. The proposed average position signal control (APSC) strategy adopts the average position of SRM1 and SRM2 as the feedback position signal, effectively promoting the synchronous operation of the dual-SRM system under the expanded unbalanced load. In addition, the proposed switching position signal control (SPSC) strategy can also achieve it by switching the position signals from those of SRM1 and SRM2. Comparing these two strategies, when the system enters a stable operating state, the APSC strategy is wiser one due to its lower speed fluctuation. When the working condition is changed and the system is in a dynamic state, the SPSC strategy is wiser one because it greatly accelerates the synchronization process of the dual SRMs, enabling them to reach the stable operating state faster. Comprehensively considering their advantages, a synchronous control strategy combining these two strategies (APSC+SPSC) is proposed, which can achieve a better synchronous operation performance of the single-converter dual-SRM system. Finally, experiments are conducted to observe the behavior of phase current self-regulation in the dual-SRM system and to verify the effectiveness of the proposed synchronous control strategies.