| Citation: | CHEN F Q，LI C H，DU Q J，et al. Instantaneous torque control of SRM based on bridge arm shared multilevel converter[J]. Journal of Beijing University of Aeronautics and Astronautics，2026，52（5）：1746-1755 （in Chinese）
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To address the issues of a low number of levels and poor torque ripple suppression effect in existing asymmetric bridge power converters for switched reluctance motors (SRM), a direct instantaneous torque control (DITC) based on a novel multi-level power converter is proposed. Firstly, a bridge arm shared five-level power conversion topology was derived for the SRM. Control flexibility was increased by achieving multiple-level combinations with the least number of power devices by providing shared bridge arms both vertically and horizontally. Secondly, an improved DITC strategy with limited switching states is developed to eliminate the switching state disorder in the commutation overlap zone caused by shared bridge arms. On this basis, various factors such as torque error, rotor position, and capacitor voltage balance are comprehensively considered to formulate conduction rules for each phase to minimize motor torque ripple. The suggested bridge arm shared multilevel torque control not only lowers current and torque ripple but also enhances motor copper loss and operating efficiency, according to comparative simulation and experimental results with traditional asymmetrical bridge power converters.
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