A predictive Loss Minimisation Direct Torque Control of Permanent Magnet Synchronous Motors

Abstract

Although permanent magnet synchronous motors (PMSMs) are inherently of high efficiency, their efficiency is enormously dependent on their control strategy. The purpose of this paper is to improve the efficiency of PMSMs under a direct torque control (DTC) method. The main idea behind the proposed method is to predict a required small change of the stator flux amplitude at each sampling period to reduce the machine electrical loss before the change is applied. Accordingly, at every sampling time, a voltage vector is predicted and applied to the machine to change the flux amplitude in a way that the electrical loss decreases. The results of simulation show significant improvement in the machine efficiency in addition to a very fast and smooth response under the proposed method.

Keywords:

• Direct torque control
• loss minimization
• permanent magnet synchronous motors

Additional information

Notes on contributors

J. Siahbalaee

Jafar Siahbalaee received his BSc degree from the Khaje Nasir University, Iran, in 1992, MSc in Electrical Engineering from the Iran University of Science and Technology in 1997, and PhD from the Sciences and Researches branch of the Islamic Azad University, Iran, in 2010. His research interests are power electronics and electrical machines and drives.

S. Vaez-Zadeh

Sadegh Vaez-Zadeh received his BSc degree in Electrical Engineering from the Iran University of Science and Technology, Tehran, Iran, in 1985, and MSc and PhD in Electrical Engineering from Queen's University, Kingston, Canada, in 1993 and 1997, respectively. He had been with several research and educational institutions in different positions before joining the University of Tehran in 1997. Currently he is the Director of the Advanced Motion Systems Research Laboratory, which he founded in 1998. His research interests include advanced rotary and linear electric machines and drives, magnetic levitation, electric vehicles, and power system analysis and control.

F. Tahami

Farzad Tahami received his BSc degree in Electrical Engineering from Ferdowsi University of Mashhad, Iran, in 1991, and MS and PhD in Electrical Engineering from the University of Tehran, Iran, in 1993 and 2003, respectively. From 1991 to 2004, he was with Jovain Electrical Machines Co. (JEMCO), Iran, where he was the head of the R&D Department. Since 2004 he has been with the Department of Electrical Engineering at the Sharif University of Technology, where he is an assistant professor. His current fields of interest are electric motor drives, modern control theories applied to power electronics, resonant converters and vehicle system dynamics.