【目的】周向错角开关磁阻电机(SRM)利用辅助绕组补偿换相过程中的主绕组转矩跌落，对抑制SRM固有的转矩脉动问题具有积极意义。扇区划分是影响直接瞬时转矩控制(DITC)效果的关键因素之一。【方法】首先，综合考虑转矩脉动抑制效果以及开关损耗，通过参数化方法优化了辅助绕组的开通角和关断角。然后，引入主绕组提前导通机制，制定了十二扇区DITC策略。最后，构建了周向错角SRM的场路耦合联合仿真模型，对比采用九扇区DITC策略和开通关断角优化后的十二扇区DITC策略的运行效果。【结果】仿真结果表明，相较于九扇区DITC策略，采用开通关断角优化后的十二扇区DITC策略大幅降低了转矩脉动系数，降幅约为84%；转矩电流比也有较大提高，提升幅度约为54%。并且，退磁相主绕组电流在在换向结束时不会出现电流尖峰，减小了在换相过程中的转矩出力负担，使换相期间的电流和转矩更加平稳。【结论】所提十二扇区DITC策略有效降低了周向错角SRM换相过程中的转矩脉动，同时提升了转矩电流比和系统运行效率，显著改善了电机在换相区的电流平滑性及稳态运行性能。

[Objective] Circumferential staggered switched reluctance motor (SRM) utilizes auxiliary winding to compensate for torque drop in the main winding during commutation, which is of positive significance in suppressing the inherent torque ripple problem of SRM. Sector division is a critical factor affecting the efficacy of direct instantaneous torque control (DITC). [Methods] Firstly, the torque ripple suppression effect as well as the switching losses were considered comprehensively, and the turn-on and turn-off angles of the auxiliary winding were optimized by parametric methods. Then, a twelve-sector DITC strategy was developed by introducing the main winding advance conduction mechanism. Finally, a field-circuit coupled co-simulation model of circumferential staggered SRM was established to compare the operating performance between the nine-sector DITC strategy and twelve-sector DITC strategy with optimized turn-on and turn-off angles. [Results] The simulation results showed that compared with the nine-sector DITC strategy, the twelve-sector DITC strategy with optimized turn-on and turn-off angles significantly reduced the torque ripple coefficient by about 84%, and the torque per ampere also improved considerably by about 54%. Moreover, the main winding current of the demagnetized phase exhibited no current spike at the end of commutation, thereby alleviating its torque output burden during commutation and ensuring smoother current and torque transitions throughout the process. [Conclusion] The proposed twelve-sector DITC strategy effectively reduces the torque ripple during the commutation process of circumferential staggered SRM and enhances the torque per ampere and the system operating efficiency. It significantly enhances the smoothness of current profiles in the commutation region and the steady-state performance of the motor.

南京工程学院科技创新基金项目(YKJ202208);江苏省重点研发计划项目(BE2021094);国家自然科学基金(51977103)