Torque Ripple Suppression Control in Vector Control for SRM Drives using Two Types of Mathematical Models with Different Electrical Angular Frequencies

Abstract

This paper clarifies the influence of inductance harmonics on the 6kth-order torque ripple in vector control for switched reluctance motors (SRMs) and proposes a torque ripple suppression control method based on two SRM mathematical models with different electrical angular frequencies. The following is clarified when deriving the 6kth-order torque ripple estimation equation for arbitrary inductance harmonics: In the case of vector control modeled at a frequency of twice the electrical angular frequency, up to (6k+4)th-order inductance must be considered to estimate the 6kth-order torque ripple. Meanwhile, vector control modeled at a frequency of the electric angular frequency must consider up to (6k+2)th-order inductance. The proposed method estimates and suppresses torque ripple using the proposed torque estimation equation. Experimental results show that the proposed method can suppress the 6th-order torque ripple by 88.2% and 89.2% for the two types of vector control. Additionally, the proposed method reduced the vibration of the SRM caused by torque ripple by 18dB and 15dB for the two types of vector control.