Abstract
For space applications there is an increasing trend to move towards using Brushless Direct Current (BLDC) motors because of their high efficiency, silent operation, compact form, reliability, and low maintenance. Traditionally, BLDC motors are commutated in six-step pattern with commutation controlled by position sensors. BLDC motors do require rotor position information in order to select the appropriate commutation angle. To reduce cost and complexity of the drive system, sensorless drive is preferred. In this paper, circuits have been designed for sensorless control technique to be used in space application and carrying out its simulation in MATLAB using controller (FLC).The sensorless rotor position technique detects the zero crossing points of trapezoidal Back-EMF induced in the BLDC motor windings. Three phase Back-EMF Zero Crossing points are sensed while one of the three phase windings is not powered. The obtained information is processed in order to commutate the energized phase pair.
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