Research And Implementation Of IPMSM Drive Control Strategy For Electric Vehicle

The dual pressures of energy and environment,making the electric vehicle with energy saving,environmental protection and high efficiency have been developed rapidly.However,there are still many urgent problems need to be solved in the development process of its industrialization,especially in the drive and control system.Also due to the performance advantage and abundant reserves of permanent magnet materials,the permanent magnet synchronous motor(PMSM)has become the main application direction of the drive motor of electric vehicle in China.Therefore,in this paper,the interior permanent magnet synchronous motor(IPMSM)as the research object,the control strategy of IPMSM drive for electric vehicle is studied deeply.Firstly,it describes the research background and significance of the topic,introduces the current development situation and prospect of electric vehicle at home and abroad.compares and analyses the performance and advantages and disadvantages of different driving motors,and finally combined with various factors and the current domestic and international electric vehicle driving motor,choosing the IPMSM as the research object of this paper and compared and analyzed the relative drive control technology of PMSM,provided the theoretical basis for the control method study of electric vehicle driving motor.Secondly,the control strategy of IPMSM with constant torque is studied deeply,analyzed and deduced the mathematical model of IPMSM under the control of MTPA.Based on the traditional MTPA control method,an improved MTPA control scheme is proposed,according to the relationship between active and reactive current,avoiding the nonlinearity between torque and current,a new control structure of PI is proposed.The improved control strategy is simplified by Taylor,and the control algorithm is more suitable for engineering application.Finally,the improved MTPA control strategy and id =0 control strategy are simulated and compared.Thirdly,the control strategy of IPMSM with constant power area flux-weakening is studied deeply.The basic principle of IPMSM with flux-weakening expansion is deeply analyzed.A scheme of MTPA flux-weakening control based on voltage feedback is proposed,the control method has strong robustness to the parameters,and can improve the working efficiency of the system.Finally,the control strategy is verified by simulation analysis.Finally,the hardware design and software control flow chart of the electric vehicle drive system are introduced in detail.The experimental platform with TMS320F28335 as the main control chip was constructed.Then,the speed regulation experiment of the motor drive system was carried out under different conditions.The experimental results verify the rationality and effectiveness of the proposed control method.