Design and Construction of a Sensorless Drive for BLDC Motor Based on Hysteresis Comparator Estimation Method
AbstractBrushless dc motors face many challenges and complexities which can be considered as sensored or sensorless schemes to detect the position of the rotor and end in a variety of results. A brushless dc motor sensorless control system is developed in this paper and a sensorless technique which is based on a hysteresis comparator and a potential start-up method with a high starting torque is suggested. Also, the phase delay of the back EMFs in case of passing low-pass filters can be compensated by the hysteresis comparator which prevents multiple output transitions from ripple or noise in the terminal voltage. The rotor position is aligned at standstill for maximum starting torque without additional sensors and motor parameter information, and by modulating the pulse width of the switching devices during alignment, the stator current can be easily adjusted. In this paper, lab consequences are provided to verify the performance of the Brushless dc motor.
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