The Research Of Buried Permanent Magnet Synchronous Motor Drive Used In Electric Vehicle

Cars shorten the distance between people and people, the distance between man and nature. however,the traditional automotive has brought great challenges for our environment and resources.For the sake for next generation, development of new energy vehicles has been inevitable.Development and application of China's automobile industry of electric vehicles will be driven beyond the traditional automotive power creates an opportunity, and buried permanent magnet synchronous motors is one of the core components of electric vehicles.Combined with the performance requirements for electric cars, this paper introduces current feed-forward regulation and voltage compensation, MTPA control, field weakening control and other aspects on the FOC vector control algorithms. current Feed-forward regulation can make the system test and eliminate the interference before the output of system isn't affected, thereby improving the ability of the control system interference. The introduction of voltage compensation can compensation the bus voltage in real time and reduces the bus voltage ripple. The field weakening control increase of the speed range of the motor, MTPA control reduces the wastage of the whole system and the power requirements of inverter.In this paper, the drive system uses three resistors sampling method instead of the current sensor, and more reliable and cost savings, using the encoder and the Hall sensor combination to feedback the motor rotor accurately feedback motor position in real time, so as to meet the requirements of electric vehicle handling performance.This paper uses STM32 series single chip microcomputer as main control chip with Keil uVision5 for microcontroller programming system, uses C language to design the control system software, and Altium Designer to design the system hardware circuit. The Drive is reliable to operate in harsh environment through differential interface circuit capable. By constantly with the result of the experiment, I debugged out a drive system performance which is stable and can satisfy the electric vehicle on the experiment platform.Due to limitations of the experimental conditions, we also build MATLAB/SIMULINK model to further illustrate that the drive can also be relatively stable under load and interference conditions.