关键词: 开关磁阻电机, 无位置传感器, 单侧互感耦合, 转子位置估计

Abstract: In switched reluctance motor with current chopping control ( CCC) , unilateral mutual inductance coupling between conducting and injection phases degrades rotor position estimation. To mitigate this effect, a rotor position identification technique based on online detection of specific position points is proposed. Finite element analysis reveals the interference mechanism of excitation-induced magnetic fields on high-frequency injection signals, and phase inductance profiles are exploited to identify characteristic position points. This strategy selects specific rotor position points by analyzing the full-cycle three-phase inductance characteristics and unilateral mutual coupling of the motor, thereby reducing the influence of mutual inductance on the self-inductance extraction of the injected phase. Even when the relative effect of mutual coupling reaches 13. 81%,the maximum deviation of the selected position points is limited to within 0. 45° ,with an absolute maximum error below 0. 65° ,enabling real-time rotor position estimation based on these points. Experimental results demonstrate that the propased method can effectively mitigate the rotor position estimation error induced by single-sided interphase mutual coupling, thereby enhancing the control accuracy.

Key words: switched reluctance motor, position sensorless, mutual inductance, rotor position estimation