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Sepic Converter Based Power Factor Correction and Commutation Torque Ripple Minimization in Permanent Magnet BLDC Motor

R. Femi, M. Godfrey Bhonz

Abstract


The permanent magnet Brushless DC motor drives are very useful in motor industries due to their speed-torque characteristics, higher efficiency and smooth operation. The PMBLDC motor drives are mostly run through diode bridge rectifier based three phase voltage source inverters, due to this diode bridge rectifier the power factor became low and also produces the power quality problems. To rectify these problems, a single switch DC-DC Single Ended Primary Inductor Converter is proposed in input side to feed voltage source inverters based PMBLDC motor drive. The proposed SEPIC converter also reduces the commutation torque ripples in the BLDC motor. The SEPIC converter provides buck-boost capacity for the BLDC motor drive and the safety of the BLDC drive can also be increased. The proposed PFC converter topology is modelled and its performance is simulated in MATLAB Simulink environment and results show an improved power quality and good power factor in wide speed range of the drive. The PI controller maintains the constant speed of the BLDC motor and the results are compared with fuzzy logic based speed control.

 

Keywords: SEPIC converters, brushless dc motor, power factor correction, commutation torque ripple, pi control


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References


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