Research On Permanent Magnet Synchronous Motor High Performance Drive System For Electric Vehicle Traction

With the sharp increase of car ownership in the world, intensifying energy issues and environmental pollution problems, seriously affecting the environment of the human survival. Therefore, the electric vehicles coming into view. The reason is that electric vehicles have the advantages of no pollution and no noise. Electric vehicles will be the future direction of the world automotive industry. How to develop higher performance, better security and reliability of electric vehicles become the focus of domestic and foreign automobile development. A motor drive control technology as one of the key technologies for electric vehicles, plays a key role to improve the performance of electric vehicles. Permanent magnet synchronous motor(PMSM) has a good drive performance, simple structure, small volume, light weight, low loss, high efficiency advantages, is widely used in drive system.In this paper, mainly from the respect of improving the system efficiency, speeding up the dynamic response rate, improving the weakening ability, enhancing the anti-interference ability and robustness of the system, an electric car with a vector control strategy of permanent magnet synchronous motor drive system is improved. Firstly introduces the principle of vector control strategy of permanent magnet synchronous motor, because the tranditional PI speed controller can not meet the non-linear, parameter variations and load fluctuations of permanent magnet synchronous motors, and it is difficult to achieve motor speed fast track with wheel speed when clutchless electric vehicles shift. Compared with conventional PI speed controller, the speed controller has faster dynamic response, smaller overshoot, shorter settling time, a smaller impact on the system performance from variations of the motor parameter and external disturbance, better robustness. Secondly, proposes a leading angle weakening flux method of. This method makes the current fluctuation is small, d-axis current and q-axis current fast response and stability is good when the motor switches from below the rated speed to the weakening flux control.Simulation studies permanent magnet synchronous motor vector control system internal mode speed control at rated speed and weakening flux expansion speed on MATLAB/Simulink platform, and analysis of static and dynamic performance with conventional PI speed control comparative is carried out. The simulation results show that the use of single neuron internal model speed control strategy can effectively improve the dynamic performance of the system, and enhance the robustness of the system and anti-inerference capability and improve the stability of the system.Finally, designs and builds the experimental platform of the vector control system of permanent magnet synchronous motor with TI company’s TMS32028335as control chip, and do some relevant experiments. Experiments results furtherly validate the feasibility and advantages of the proposed single neuron internal speed model of permanent magnet synchronous motor vector control system for electric vehicle..Simulation and experimental results show that PMSM electric vehicle drive control system sdudid in this paper can make the motor speed fast tracking the wheel speed, and affected by the parameter variations and load fluctuation is small, can automatically adjust the controller parameters, realizes the smooth shift of electric vehicles without clutch, and achieves a wide range of speed regulation, is a high performance drive system.