Improved method on flux-weakening control of permanent magnet synchronous motor in electric vehicles

摘要

Described the operating principles of permanent magnet synchronous motor used in electric vehicles. Introduced weakening principle due to its mathematical models. Traditional control after decoupling often used PI controller, often influence of motor parameters, affecting the robustness of control system, especially operated at above the rated speed on flux weakening condition. Analyzed the proportional resonant (PR) controller features, against its defects, presented a control method based on an improved PR (IPR) controller and phase-shift flux weakening control strategy. Finally, simulation results showed the control strategy has good robustness and dynamic performance. The validity of this method is verified.