Attenuating saturated-regulator operation effect of brushless DC motors through genetic-based fuzzy logic estimator

As brushless DC motor (BLDCM) speed approaches base speed, current regulators gradually saturate andlose their ability to perform their regulating task, which causes a dramatic fall in the phase currents and motor power.To control the current to a greater extent and avoid power decline, a new reference current generation technique basedon a simple fuzzy logic estimator (FLE) is introduced in this paper. According to motor speed and current command,the developed FLE decides the proper commutation angle α, which is the angle relative to normal commutation instantused for setting the current slew rate during commutation. In this sense, current references are obtained with the sameslew rates of commutated phases all the time, ensuring the noncommutation phase current is constant. The validity ofthe study is widely verified using DSP of TMS320F28335 and it is concluded that promising performance and simplicityare important advantages of our proposal that render it convenient for a BLDCM drive system that requires boostedpower in high-speed ranges.

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