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Closed Loop Speed Control of Miniature Brushless DC Motors

H. L. Chan and K. T. Woo
Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Hong Kong, China

Abstract—Three-phase miniature brushless DC (BLDC) motors are very popular on small Unmanned Aerial Vehicles (UAVs). Due to the shape and size limitation, it is hard to install devices like optical encoders for implementing a closed loop speed control. It is important to have speed control of motors on UAVs since the system dynamics are related to the rotation speed of the motors. This paper presents a sensorless phase voltage detection scheme to measure the rotation speed. A PID controller is implemented to ensure the performance of the motors. A mathematical model of Delta-Connected BLDC motors is built for analyzing the relationship between phase voltage and rotation speed. The experimental results demonstrate a fast response time and accurate results.

Index Terms—BLDC motors, UAV, closed loop feedback, phase voltage, speed control

Cite: H. L. Chan and K. T. Woo, "Closed Loop Speed Control of Miniature Brushless DC Motors," Jounal of Automation and Control Engineering, Vol. 3, No. 4, pp. 329-335, August, 2015. doi: 10.12720/joace.3.4.329-335

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