Speed sensorless fuzzy adaptive PI direct torque control of asynchronous motor

In order to solve the problem of speed instability and large overshoot of speed sensorless direct torque control. Firstly, auto-coupling PI is introduced to improve the speed regulation performance of sensorless direct torque control and reduce steady-state error. Secondly, the variable universe fuzzy adaptive PI control strategy is proposed to reduce the torque ripple and improve the speed regulation performance, aiming at the shortcomings of direct torque control such as large torque ripple and poor speed regulation performance. Finally, it is simulated under Matlab/Simulink and the validity and feasibility of the above are proved. The results show that the simulation results of direct torque control system show that the speed overshoot is reduced, the response time of speed rising to high speed is shortened, and the load resistance is improved.