Torque ripple suppression method for hybrid stepper motor based on adaptive freewheeling ratio
Hybrid stepper motors exhibit significant torque ripple due to high current ripple during subdivision driving.This paper proposes an adaptive freewheeling ratio control meth-od for hybrid stepper motors,building upon the analysis of the current continuation process in the H-bridge driver circuit.The method utilizes a subdivision current command iref,genera-ted by a ring allocator,to distinguish the current continuation mode at each moment.In the fast continuation mode,the real-time difference between the current command and the actual current △iref is continuously monitored.An adaptive coefficient k dynamically adjusts the du-ration of fast continuation until the motor phase current rapidly decreases to iref,transitioning into the slow continuation mode.By adaptively regulating the charging time and the propor-tion of fast continuation time to the total continuation time,this approach enables smooth op-eration of the hybrid stepper motor under different operating conditions,effectively reducing torque ripple.A simulation platform using Matlab/Simulink is construct and experimental verification is carried out.The results demonstrate that the proposed method achieves lower torque ripple compared to the traditional mixed freewheeling mode control.
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维普
