Research On FOC Of PMSM For Vehicle Based On Model Free Adaptive Control

Permanent magnet synchronous motors(PMSMs)and motor control systems for electric vehicles are different from those used in industrial applications.They are required to meet the requirements of wide speed range,large moment of inertia,frequent load changes and unpredictable road conditions.Thus,traditional vector control based on Proportional Integral(PI)control needs to adjust the control parameters dynamically,causing problems such as PI control overshoot,overcurrent,instability,and insufficient decoupling.In this paper,a creative control scheme,based on model free adaptive control(MFAC)theory,is proposed for PMSM and motor control systems.It’s the first time MFAC theory is applied to current control and decouping control of vehicle PMSM.For nonlinear discrete-time single-input single-output(SISO)system with known or unknown time-varying parameters,the MFAC-based closed-loop control system has good output tracking performance.A speed control scheme is designed based on MFAC and the proof of convergence has been given,according to the motion equation of permanent magnet synchronous motor with MFAC full-format dynamic linearization model and theory.For nonlinear discrete-time multi-input multi-output(MIMO)systems with known or unknown time-varying parameters and with unknown couping,the MFAC-based closed-loop control system has good output tracking performance and decouping function.A current control scheme is designed based on MFAC,according to d-q aix voltage equation with MFAC full-format dynamic linearization model and theory.In this paper,the feasibility and effectiveness of the vehicle PMSM vector control scheme,which is speed control and current control based on MFAC,is validated,through simulating the actual road conditions of electric vehicle and conducting model simulation and testing.