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Closed Loop Speed Control of Miniature Brushless DC Motors

Authors Chan, Hoi Lam
Woo, Kam Tim View this author's profile
Issue Date 2014
Source SCIEI ICRAE 2014 , Bangkok , Thailand, Oct 2014
Summary 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.
Language English
Format Conference paper
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