Research On The Key Technologies Of Hybrid Excitation Synchronous Motor For Electric Vehicle Application

Hybrid excitation synchronous motor(HESM)has the characteristics of strong torque output ability,high torque density,high efficiency and easy regulation.The problems of permanent magnet synchronous motor(PMSM)is overcomed,such as high temperature,easy loss of excitation,limited speed range and so on.It is more suitable for wide speed regulation fields such as electric vehicles.Therefore,the research on Control Technology of HESM has important theoretical significance and engineering value.The asymmetric staggered hybrid excitation synchronous motor is taken as the research object in this paper.Firstly,based on the study of the topological structure and mathematical model of this type of motor,the simulation control system model is established in MATLAB/Simulink.Secondly,a sliding mode speed controller is designed based on the current control strategy of excitation current control strategy that based on load observer and q-axis current feed-forward compensation strategy for low-speed operation.The sliding mode speed controller not only improves the dynamic speed control performance of hybrid excitation synchronous motor and the load-carrying capacity at low-speed,but also overcomes the influence of time-varying load on the control performance.Then,in view of the high-speed operation conditions,a control strategy based on fuzzy control is proposed,which takes the speed error and load observation as the input of fuzzy control,realizes the dynamic adjustment of the given excitation current,coordinates the contradiction between the load and the weak excitation speed expansion of the excitation current in the hybrid excitation synchronous motor,and designs an auto-disturbance rejection speed controller to satisfy the weak excitation expansion.On the basis of speed requirement,the carrying capacity and anti-disturbance ability of high-speed operation are improved.Based on the research of high and low speed control strategy,the operation performance of hybrid excitation synchronous motor in the whole operating range is simulated and analyzed,and the effectiveness of the proposed control strategy is verified.Finally,a motor drive system based on the high performance DSP chip of TMS320F28335 is designed.The principle design of hardware circuit and the software system design are mainly based on detection,drive and control.Some functions are verified by using the existing experimental conditions.Aiming at the different operating conditions of hybrid excitation synchronous motor,different current control strategies and speed control strategies are adopted respectively to realize the optimal configuration of armature current and excitation current and the high performance dynamic speed control quality.The simulation results show that the control strategy in this paper meets the good speed control effect of electric vehicle with low speed,large torque and wide speed regulation.It is a hybrid excitation synchronous motor.It lays a foundation for further research and practical application in industrial field.