Li Zeng

Work place: Wuhan Institute of Technology, Wuhan, China



Research Interests: Engineering


Li Zeng was born in Hubei Province, China, in 1978. He received the B.E. degree in automation in 2001 from Liaoning Institute and Technology, Jizhou, China, and the M.E. degree in electrical engineering in 2005 from Guizhou University, Guiyang, China.
Since 2008, she has been a docent at Wuhan Institute of Technology, China. She is engaged in research on ac motor drivers.

Author Articles
Control System of Sensorless Brushless DC Motor Based on TMS320F240

By Li Zeng Zicheng Li

DOI:, Pub. Date: 8 Nov. 2011

A brushless DC(BLDC) motor with the characteristics of high speed and high power density has been more widely used in industrial area. The BLDC motor requires the position and speed sensors for control. However the position sensors are undesirable from standpoints of size, cost, maintenance and reliability. There are some different ways that can solve this problem, depending on the flux distribution. This paper describes a control system of sensorless BLDC motor. The back-EMF is adopted to detect the rotor position. The back-EMF is very small in the motor starting process, and it is difficult to obtain rotor position efficiently. A re-setting method of the rotor is proposed in the paper, and current closed loop is used for high-speed and safety in the motor starting process. A good speed and current double closed loops system is designed. The speed and current regulators are implemented by a digital signal processor(DSP). A simple algorithm is used to calculate motor speed indirectly by the software, which simplifies the system hardware structure. The hardware structure and software design of sensorless BLDC motor control system are described in details. The simulation and experimental results have shown the validity of the sensorless control system and the accuracy of the detective position signal obtained.

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