Self-Tuning Control of Advanced Angles for Doubly Salient Motor Drive System

Due to the advantages of simple mechanical structure, high reliability, and high power density, a doubly salient electromagnetic machine (DSEM) has wide application prospects in many areas. Many driving strategies for the DSEM have been developed in recent years, including the standard angle control, the three-state advanced angle control, the six-state advanced angle control, the nine-state advanced angle control, etc. Compared with standard angle control, the driving strategies with advanced angles can further increase the output torque and reduce the torque ripples in the medium/high-speed region. However, the advanced angles are very difficult to select, and the commonly used field-circuit co-simulation method by enumerating advanced angles consumes a lot of time. In addition, once the working condition changes, the advanced angles should be reselected. In this article, self-tuning control of advanced angles based on a several-angle alternating method is proposed, which is carried out by iteratively calculating the advanced angles according to the working conditions. The operating principle of the proposed method is analyzed in detail, together with the change in the pattern of advanced angles and the output characteristics of DSEM. In addition, the implementation method is described, with the upper limitation of advanced angles being selected. Finally, the effectiveness and the feasibility of the proposed method are verified by field-circuit co-simulations and experiments.