An improved flux linkage estimator for a direct torque controlled interior permanent magnet synchronous machine drive

Abstract

In a direct torque controlled (DTC) drive, accurate flux estimation is the key to achieve good steady-state and dynamic performance. The effects of the stator resistance variation of the stator resistance and the forward voltage drops of the power switches are analysed and mitigated in this paper. Modelling and experimental results confirm the effectiveness of the proposed flux estimator.

Keywords:

• Drive
• parameter estimation
• permanent magnet synchronous machine

Additional information

Notes on contributors

Lixin Tang

Lixin Tang

Lixin Tang received the B. Eng. and M. Eng. degrees in electrical engineering from Nanjing University of Aeronautics and Astronautics, Nanjing, P. R. China, in 1991 and 1994 respectively. From Apr. 1994 to Aug. 1998, he worked in Beijing Institute of Mechanical Equipment, firstly as an assistance electrical engineer, and then was employed as an electrical engineer in 1996. He has participated in several projects on static frequency converters. In Aug. 1998, he joined GE Hangwei Medical Systems Co. Ltd. as a senior electrical engineer; where he was in charge of the re-design, quality control and technical support of the x-ray generator (XG) subsystem of several CT scanners. In 2000, he left for higher studies in Australia. He has studied for 4 years in the University of New South Wales for Ph.D and he is now working as a research officer at Central Queensland University. His research interests are AC drives, renewable energy and power converters.

Muhammed F. Rahman

Muhammed Fazlur Rahman

Muhammed Fazlur Rahman (M’79, SM’96) graduated in electrical engineering in 1972 from the Bangladesh University of Engineering and Technology. He proceeded to do his Masters and Ph.D. from University of Manchester, U. K., which were obtained in 1975 and 1978 respectively. He subsequently worked as a Systems Design Engineer at the General Electric Projects Co. of U. K. at Rugby for two years before joining the National University of Singapore in 1980. In 1988, he joined the University of New South Wales, Sydney, Australia, as a Senior Lecturer. He is currently an Associate Professor. His research interests are power electronics, motor drives, electrical machines, and motion control systems.