THE SIMULATION OF HYSTERESIS DIRECT TORQUE CONTROL OF PERMANENT MAGNET SYNCHRONOUS MOTOR

Abstract

In parallel to the recent developments in microprocessors technology and production of strong magnets the interest on Permanent Magnet Synchronous Motors (PMSM) increases continuously. With the use of PMSM it is now possible to work in a wide speed range in direct excitation systems. PMSM are widely used in different areas like elevators, electrical vehicles, pumps and space technology. In Direct Torque Control (DTC), one of the vector control methods of PMSM stator flux, rotor flux and torque are directly controlled using a suitable switching strategy for the inverter. Using DTC, a better dynamic response and a flexible control is obtained in variable speed applications in driver systems with respect to the other control methods. DTC is realized in two ways namely hysteresis and space vector modulation. In this study, the simulation of hysteresis DTC of PMSM is generated with Matlab/Simulink. According to the results obtained, it is observed that in the case that hysteresis DTC is used for the control of PMSM, a good dynamic response and flexible control can be obtained for variable load states in a wide speed range.