Sensorless Control of Switched Reluctance Motor Based on Current Waveform Detection

Abstract

This paper describes a sensorless control technique Based on current waveform detection for Switched Reluctance Motor (SRM) over full speed-range. For conventional sensorless method, the resistive drop and the back- EMF are always neglected, which may cause some errors in position determination and restrict the rotor speed-range. To overcome this problem, an improved current-slope-difference based approach is presented for sensorless starting and continuous low-speed sensorless operation. For medium and higher speeds, a current-gradient method is used for sensorless operation. Based on the proposed sensorless method, the position sensorless operation within the whole speed range of the SRM can be easily implemented. Finally, the experimental results demonstrate the validity of the hybrid sensorless approach in the full speed region.

Keywords:

• switched reluctance motor (SRM)
• current waveform detection
• pulse width modulation (PWM)
• sensorless control

Additional information

Notes on contributors

Jie Shao

Jie Shao received the Ph.D. degree in electrical engineering from the Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 2017. She is currently a Lecturer with College of Engineering, Qufu Normal University, Rizhao, China. Her current research interests include sensorless control techniques and high-speed switched reluctance starter/generator.

Zhiquan Deng

Zhiquan Deng received the Ph.D. degrees in engineering machinery from Northeastern University, Shenyang, China, in 1996. In 1996, he was a Postdoctoral Fellow with the Nanjing University of Aeronautics and Astronautics, Nanjing, China, where he joined the Department of Electrical Engineering in 1998 and is currently a Professor with the College of Automation Engineering. His current research interests include bearingless motor drive systems, magnetic bearings, and super high-speed electrical machines.