Abstract: With the rapid and increasing advancements in field of semiconductor technology the brushless DC motors are extensively used in the computer peripherals, videos recorders, spindle drives, aerospace industry, military equipments, automated industry, and other household equipments, since practically they need no maintenance, have long life, low inertia and friction. Because of low inertia and friction they can be used in very high speed applications. This paper deals with, a position sensorless brushless direct current (BLDC) drive operation is described. Detection of back EMF zero crossing from line voltage difference is employed here for the sensorless drive operation. The line voltage difference gives an amplified version of back EMF which makes the sensorless operation possible. Low pass filters are used for eliminating the spikes in the wave form and to provide the necessary delay required for the proper commutation of switches. Neutral potential is not needed for obtaining the commutation pulses. Sample and hold circuit is also not needed since the use of filter eliminates the spikes. Proposed sensorless drive is simulated using MATLAB/ SIMULINK. The PMBLDC motors are controlled electronically and for the proper commutation of current, rotor position information is required, on the other hand the problems of the cost temperature sensitivity and reliability of position sensors have motivated the research in the area of sensor less PMBLDC motor drives.
Keywords: Back electromotive force (EMF) detection, Brushless DC motor, Filtered line voltage difference, Low pass Butterworth filter, and sensorless control.
Title: Simulation of Back EMF Based Sensorless BLDC Drive Using Filtered Line Voltage Difference
Author: Nimisha Tiwari, Prabodh khampariya
International Journal of Electrical and Electronics Research
ISSN 2348-6988 (online)
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