Direct torque control of permanent magnet synchronous motors in MATLAB/SIMULINK

This paper describes an investigation of the direct torque control (DTC) for permanent magnet synchronous motor (PMSM) drive. It is proven by equations that the increase of electromagnetic torque is proportional to the increase of the angle between the stator flux and the rotor flux linkage. The use of permanent magnet synchronous motor combined with direct torque control offers many opportunities such as quick, robust response and high-performance operations, which is desired for servo and traction applications in electric vehicles and wind turbines. In this paper, an overview is given. The basic principles of DTC for PMSM are explained. In addition, the estimations of stator flux linkage, torque and initial rotor position are needed in control scheme. To verify the feasibility of this scheme, simulation on SIMULINK is carried out. The results show an excellent characteristics for torque response and efficiency.