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Abstract

A four-phase switched reluctance motor torque ripple three-level suppression method. A first set of torque thresholds is set in rotor position interval [0°, θ_r/4]. A second set of torque thresholds is set in rotor position interval [θ_r/4, θ_r/2]. Power is supplied to adjacent phase A and phase B for excitation. The power supplied for excitation to phase A leads the power supplied for excitation to phase B by θ_r/4. An entire commutation process from phase A to phase B is divided into two intervals. In rotor position interval [0°, θ₁], phase A uses the second set of torque thresholds while phase B uses the first set of torque thresholds. Critical position θ₁ automatically appears in the commutation process, thus obviating the need for additional calculations. Total torque is controlled between [T_e+th2_low and T_e+th2_up]. In rotor position interval [θ₁, θ_r/4], phase A continues to use the second set of torque thresholds, phase B continues to use the first set of torque thresholds, and the total torque is controlled between [T_e+th1_low and T_e+th1_up]. This suppresses torque ripples of a four-phase switched reluctance motor and provides great engineering application values.

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