Design And Realization Of Permanent Magnet Synchronous Motor Drive Control System For Electric Vehicles

Due to the development of the car brought about by the environmental and energy problems have become increasingly prominent,governments are vigorously supporting the development of new energy vehicles,dozens of years ago,electric vehicles once again aroused widespread concern.Electric vehicle energy saving and environmental protection,performance advantages,coupled with China's rich permanent magnet material reserves,so that permanent magnet synchronous motor to become China's electric vehicle drive the main application direction.In this paper,the built-in permanent magnet synchronous motor as the research object,the electric vehicle with permanent magnet synchronous motor drive control system related strategies in-depth study.In this paper,the present situation of the development of electric vehicles at home and abroad is introduced.Compared with the electric motor of electric vehicle,the built-in permanent magnet synchronous motor is used as the research object.The main control method of permanent magnet synchronous motor is introduced.The mathematical model and coordinate transformation of the built-in permanent magnet synchronous motor are analyzed,which provide the theoretical basis for the research of the control method of the electric vehicle drive motor.The research on the control system of permanent magnet synchronous motor is the research of the motor control technology.In this paper,vector control technology is adopted in the vehicle permanent magnet synchronous motor drive control system.The technical part includes two parts,namely,the rated speed of the motor and the motor Above the rated speed,in these two parts need to take a different control strategy.In this paper,an improved vector control strategy is proposed,which uses the maximum torque current ratio control below the rated speed.At the same time,a MTPA field weakening control scheme based on voltage feedback is proposed,which is adopted above the rated speed.The control method has strong robustness to the parameters.Whether the motor enters the weak magnetic field is judged by comparing the expected stator voltage amplitude with the allowable value of the inverter.The simulation and experimental results show that the vector control strategy adopted in this paper can achieve better control performance.Finally,the hardware design and software control flow chart of the electric vehicle drive system are introduced in detail,and the experimental platform with TMS320F28335 as the master chip is constructed.Then,the speed control experiment of the motor drive system under different working conditions is carried out.The control method proposed in this paper has been verified and proved to be reasonable and effective.