XIE Li1, JIANG Wei1, ZHOU Bin xin2, WU Song1

 

(1. School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China;

 

2. Dade technology mechanical and Electrical Technology company, Yangzhou 225000, China)

 

 

Abstract: Aiming at the problem of flux overflow and torque ripple spill in the traditional direct torque control, the three phase induction motor direct torque control was studied. New control method based on voltage space vector PWM was proposed. First of all, the target electromagnetic torque was generated by the amount of change of speed. Then, the magnitude of the voltage vector was calculated according to the amount of change of stator flux. The direction of the voltage vector was determined using the amount of change of torque. The three phase input voltage was gained through the voltage vector PWM inverter to complete the overall control. The method overcame the shortcomings in traditional methods. The stator flux was controlled quantitatively, and the better circular flux trajectory control was achieved. At last, a system model was built based on Matlab/Simulink software. The results indicate that the system has stable flux magnitude, low torque ripple, fast response speed, short transient time, and can simulate the real system ideally and effectively.

 

Key words: induction motor; direct torque control; flux; torque