The Pmsm DTC Based On Sliding Mode Variable Structure

Permanent magnet synchronous motor(PMSM) has a simple structure, light weight, small size, low torque ripple, reliable, low loss, high density gap, high efficiency. It is used widely in the case of high control accuracy and high reliability requirements modern AC motor.In the permanent magnet synchronous motor control system, the direct torque control as a high-performance control strategy has been widely used, and the speed performance was very good. But direct torque control also has problems: torque and flux ripple, low speed and poor performance shortcomings. A non-linear control mode variable structure control strategy has a strong anti-disturbance, fast response, robustness, easy to implement and many other advantages. Sliding speed application performance control of permanent magnet synchronous motor direct torque control system will be greatly improved.The structural characteristics of permanent magnet synchronous motor is described in this paper.And the relationship between the magnetic circuit is analyzed. So permanent magnet synchronous motor direct torque control system is set up.Application of Matlab / Simulink control system simulation, simulation results analysis, pulsation problems is researched and analyzed. In order to solve the PMSM direct torque control system problems, in-depth research and analysis variable structure control,.Thus the simulation of weakening the chattering is studied. Finally a combination of approaches variable structure control strategy law is chosen in the permanent magnet synchronous motor direct torque control system. With TMS320F2812 DSP as control core of system, the hardware experimental platform of a permanent magnet synchronous motor direct torque control system was set up and the experiment was debugged. The experiment and Simulation results show that the present governing system has strong anti-jamming capability, robustness, good dynamic and static quality advantages. The design for the vibration problem has a good inhibitory effect. It is used in high performance speed control system.