Modelling And Simulation of Direct Torque Control For Multi-Phase Switched Reluctance Motor Drive

Abstract

Switched reluctance motors (SRMs) are rugged, simple in construction and economical compared with synchronous motor and induction motor. They are known to have high-peak torque-to-inertia ratio and the rotor mechanical structure is well suited for high-speed applications. Direct torque control (DTC) is known to produce quick and robust response in AC drives. However, during steady state notable torque, flux and current pulsations occur. They are reflected in speed estimation, speed response and also in increased acoustic noise. This paper presents a novel DTC scheme where fast torque response with low ripples in the stator flux and torque of five-phase SRM drive can be achieved. In comparison with DTC of three-phase, the five-phase DT C system has more space vectors providing greater flexibility in selecting the inverter switching states, thus accomplishing a more precise control of the stator flux and torque. Simulation results clearly demonstrate that the combination of DT C with multi-phase SRM realizes higher performance with greater prospects in industries.

Key Words:

• Direct torque control
• flux control
• multi-phase switched reluctance motor
• torque ripple reduction

Additional information

Notes on contributors

R. Jeyabharath

R. Jeyabharath received his bachelor’s degree from Thiagarajar College of Engineering, Madurai, and got his master’s degree from PSG College of Technology, Coimbatore. He is doing Ph.D. in the field of AC drives and Vector control.

P. Veena

P. Veena received her bachelor’s degree and master’s degree from Government College of Engineering, Salem. She is doing her Ph.D. in the field of intelligent control for AC drives.

M. Rajaram

M. Rajaram received his bachelor’s degree from Alagappa Chettiar College of Engineering and Technology, Karaikudi and got his master’s degree from GCT, Coimbatore. He received his Ph.D. from PSG College of Technology, Coimbatore. His field of interest is control systems and special machines.