A New Torque Sharing Function Method Based on Torque–Current Ratio for Switched Reluctance Motor Using Adaptive-Speed Controller

This article proposes a new torque sharing function (TSF) method with an adaptive speed controller to reduce torque ripple and improve dynamic response of switched reluctance motor (SRM). To address system uncertainty caused by the nonlinear characteristics of the SRM, the adaptive speed controller, based on the mechanical equations of SRM, is designed to effectively track the desired speed and generate the required total torque. By distributing the desired total torque during commutation according to the torque-current ratio, a new TSF is proposed to ensure that phase torque regulation aligns with the torque output capability of each phase to reduce the current peak and torque ripple. To further mitigate torque tracking errors caused by SRM nonlinearity, a compensation method is introduced, utilizing the phase with a higher torque-current ratio for error compensation, improving torque control accuracy. Additionally, a novel hybrid chopping PWM method, based on the torque-current ratio and asymmetric topology, is proposed to reduce switching losses and torque ripple. Experimental results from a three-phase 12/8 SRM prototype validate the effectiveness of the proposed method in reducing current peak, minimizing torque ripple, and improving system efficiency.