A simple first order compensator for brushless direct current drive based position control system

Brushless direct current (BLDC) motors have advantages viz. high torque per weight, high torque per watt, increased reliability, reduced noise and a longer lifetime. A BLDC motor is an electronically commutated motor. Electronic commutation is sparkless because it does not involve any mechanical commutator and brush. It also eliminates electromagnetic interference. Because of these advantages, BLDC motors can also be used in hazardous environments. They find wide applications in industrial positioning and actuation. The wider usage of BLDC motors demands optimum position control in such applications for high efficiency, accuracy and reliability. A first order compensated BLDC drive is proposed in this paper to achieve effective position control. Simulation results at different loads clearly reveal that the proposed first order compensated BLDC drive system could yield comparable results with a proportional integral derivative controlled BLDC drive system. A proposed first order compensator is designed using analog components and the experimental results of compensated BLDC drive system are obtained to show the usefulness of the compensator for effective position control.