Abstract
As brushless DC motor (BLDCM) speed approaches base speed, current regulators gradually saturate and lose 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 based on 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 $\alpha $, which is the angle relative to normal commutation instant used for setting the current slew rate during commutation. In this sense, current references are obtained with the same slew rates of commutated phases all the time, ensuring the noncommutation phase current is constant. The validity of the study is widely verified using DSP of TMS320F28335 and it is concluded that promising performance and simplicity are important advantages of our proposal that render it convenient for a BLDCM drive system that requires boosted power in high-speed ranges.
Highlights
Brushless DC motors (BLDCMs) offer many advantages such as high power density, high efficiency, low rotor inertia, low maintenance, reliability, and low electromagnetic interference problems [1,2,3]
When the motor is required to operate in such a condition, flux weakening (FW) is an indispensable requirement that opposes the emf by generating a demagnetizing current component Id that weakens the air gap flux
The slew rate of the phase current is made adaptive to motor speed and current command, and is set by a control parameter denoted as commutation angle α
Summary
Brushless DC motors (BLDCMs) offer many advantages such as high power density, high efficiency, low rotor inertia, low maintenance, reliability, and low electromagnetic interference problems [1,2,3]. The constant torque region of the motor is widened to higher speeds without leading to the severe power ripple present in FW-based techniques owing to keeping the phase current and back emf in phase This forms another important feature of our proposal since it ensures operation at maximum torque per amp. Encouraged by the desire of improving poor current regulation during saturated-regulator operation of a BLDCM, the authors of this article have proposed a new reference current generation mechanism on the basis of equal slew rates of commutated phases during commutation In this mechanism, the slew rate of the phase current is made adaptive to motor speed and current command, and is set by a control parameter denoted as commutation angle α. We realize that our proposal offers important advantages such as superior performance and simplicity, which are concerns of practice
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