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This paper proposes an online sensorless rotor position estimation technique for switched reluctance motors (SRMs) using just one current sensor. It is achieved by first decoupling the excitation current from the bus current. Two phase-shifted pulse width modulation signals are injected into the relevant lower transistors in the asymmetrical half-bridge converter for short intervals during each current fundamental cycle. Analog-to-digital converters are triggered in the pause middles of the dual pulse to separate the bus current for excitation current recognition. Next, the rotor position is estimated from the excitation current, by a current-rise-time method in the current-chopping-control mode in a low-speed operation and a current-gradient method in the voltage-pulse-control mode in a high-speed operation. The proposed scheme requires only a bus current sensor and a minor change to the converter circuit, without a need for individual phase current sensors or additional detection devices, achieving a more compact and cost-effective drive. The performance of the sensorless SRM drive is fully investigated. The simulation and experiments on a 750-W three-phase 12/8-pole SRM are carried out to verify the effectiveness of the proposed scheme.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

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    • Jianhua Wu received the B.S. degree from the Nanjing University of Aeronautics and Astronautics, Nanjing, China, and the M.S. and Ph.D. degrees from the Huazhong University of Science and Technology, Huazhong, China, in 1983, 1991, and 1994, respectively, all in electrical engineering. From 1983 to 1989, he was with Guiyang Electric Company, Guizhou, China, as a Design Engineer.
    • Since 2005, He has been a Professor at the College of Electrical Engineering, Zhejiang University, Zhejiang, James L. Kirtley, Jr. (LF'91) received the Ph.D. degree from the Massachusetts Institute of Technology (MIT), Cambridge, MA, USA, in 1971. He is a Professor of electrical engineering with the Department of Electrical Engineering and Computer Science, School of Engineering, MIT. His research interests include electric machinery and electric power systems. Prof. Kirtley served as the Editor-in-Chief of the IEEE TRANSACTIONS ON ENERGY CONVERSION from 1998 to 2006 and continues to serve as an Editor for the journal, and he is a member of the Editorial Board of Electric Power Components and Systems. He was the recipient of the IEEE Third Millennium Medal in 2000 and the Nikola Tesla Prize in 2002. He was elected to the U.S. National Academy of Engineering in 2007.
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