Deadbeat Predictive Current Control Strategy for Low-Speed Operation of Permanent Magnet Synchronous Motor Based on Rotor Position Tracking Control

During low-speed operation of permanent magnet synchronous motors, the motor speed can fluctuate significantly due to non-ideal factors such as cogging torque, detection errors, and delays. The rotor position tracking control strategy converts the speed command into a real-time rotor position trajectory. This can effectively reduce speed detection errors and the strategy performs well against both periodic and non-periodic torque perturbations under low-speed conditions. But the method does not take into account the effect of current control at low speeds. The deadbeat predictive current control uses the prediction model and the current voltage and current sample values to calculate the control voltage vector to be applied at the next instant. This approach avoids the cumbersome parameter tuning required by traditional controllers, improves the response speed of the current loop, and ensures the dynamic performance of the system. This paper proposes a combination of the deadbeat predictive current control based on rotor position tracking control. This combination effectively improves the response speed of the speed and current loops of the PMSM during low-speed operation, while ensuring the robust stability and anti-interference capability of the system. The proposed scheme's accuracy is verified through simulation.