Abstract:The brushless dc motor (BLDCM) suffers the prominent drawback of torque ripple, a novel hybrid control strategy based on dc link voltage control and fuzzy PID controller is proposed to suppress torque ripple of BLDCM. The circuit topology contains a power factor correction (PFC) buck converter and a inverter. The PFC buck converter reduces the commutation torque ripple by controlling dc link voltage, the inverter using fuzzy PID controller and pulse width modulation (PWM) technique supplies the appropriate current in the conduction region. The experimental results show the proposed strategy suppresses torque ripple efficiently with the function of power factor correction.

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The switched reluctance motor (SRM) suffers the main drawback of torque ripples, and a buck converter-fed SRM motor drive has been proposed to suppress torque ripples and correct a power factor in this paper. The buck converter reduces the torque ripple by supplying appropriate DC-link voltage; meanwhile, the buck converter realizes a function of power factor correction at AC mains. An enhanced performance has been obtained on speed control and power quality improvement. An experimental SRM motor drive is formed, and the experimental results show that the proposed drive possesses an improved function with suppression of torque ripples and power factor correction.

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