Design and Implementation of Sensored Brushless DC Motor Control Using dsPIC30F4012 for CW/CCW Bidirectional Rotation

Abstract

This paper presents the development of BLDC (Brushless DC) motor control based on dsPIC30F4012. The system is designed to control motor rotation in clockwise (CW) and counter clockwise (CCW) directions. There are 3 input pins used to facilitate the control interface, namely ground (GND) pin, control (CTRL) pin and enable (EN) pin. An analog input was assigned as command input for rotation in CW/CCW direction. The CTRL pin input has full-scale of analog input that comprises of three regions, namely CCW rotation input (0V~2.4V), CW rotation input (2.6V~5V), and neutral input (2.5±0.1)V as the deadband. The commutation sequences of six steps for direction of motor rotation, while P-I (Proportional-Integral) controller is used to control the motor current. The control law and commutation sequences are implemented in single chip dsPIC30F4012 microcontroller. To verify the system performance, we test the system implementation to drive BLDC motor and measured current are sent to the host PC through serial communication. From the experimental results it is shown that the realizing P-I controller is good performance in small frequency where the bldc motor current can follow the input commands. The bandwidth of motor control to characterize the performance of designed system is also presented.