In view of the problem of large torque pulsation under traditional model predicted torque control

a model predicted torque control method based on duty cycle modulation was proposed. The torque hysteresis ring pre-screening method was used to reduce the number of seven basic voltage vector predictions in the traditional model predicted torque control to three

and feedback compensation was added to the torque and magnetic flux prediction links to further improve the accuracy of the prediction model. Based on the principle of no-difference beat

the optimal duty cycle corresponding to three different voltage vectors was calculated. The duty cycle calculation part was placed before the parallel evaluation function

and the duty cycle and the torque and magnetic flux prediction value after feedback were brought into the parallel evaluation function to select the optimal voltage vector and its corresponding duty cycle

and output the optimal expected voltage vector through duty cycle modulation. Simulation and experimental results show that the proposed model predictive torque control method based on duty cycle modulation can effectively suppress the torque pulsation of the motor and reduce the harmonic content of the stator current.