Research On The Drive Control System For Electric Vehicle IPMSM

With rapid development of economy and technology, environment and energyissues are imminent. Vehicle exhaust emissions has became one of the main reasons forenvironmental pollution while oil and other non-renewable resources are constantlyexhausted. Now development of all-electric-powered vehicles has become an effectiveway to solve the above problems. But, development of EV still faces many problemssuch as battery-powered endurance, efficiency of the drive motor, dynamic and staticcontrol features, and so on. Interior Permanent Magnet Synchronous Motor (IPMSM) isused as a driving motor. By analysing constant torque and flux-weakening controlstrategy of IPMSM, an anti-torque constant disturbance torque control strategy andindependent of motor parameters’ weakening control scheme that can improve thedynamic performance and robust performance are proposed. Simulation andexperimental results of the two control strategy proposed are presented and tested toverify the validity of the theoretical analysis.Firstly, the thesis research the ideal driving characteristics of EV and built themathematical model of IPMSM in the synchronous rotating coordinate system. On thebasis of this mathematical model and the driving characteristics, the best electric vehiclecontrol strategy of IPMSM is proposed, including the constant torque control strategyand the weakening control strategy above base speed field. Simulation model of those isestablished, which provide the theoretical basis to achieve the best control strategy ofEV.Secondly, research on constant torque control algorithm of IPMSM. MTPA whichcan achieve a minimum copper loss is analyzed and studied, a segmented second-orderfitting MTPA is implemented. Meanwhile, in order to meet the frequent starting.of EV,intelligent PI speed regulator is introduced. Using simulation softwareMatlab/SimuLink establish the simulation model of intelligent PI fitting MTPA.Comparaing with Traditional PI regulator, the intelligent PI fitting MTPA has gooddynamic and good resistance to torque disturbance performance.Thirdly, this thesis carried out research on field weakening control strategy of EVIPMSM. The work environment of the EV will cause higher temperature of the motorand variation of the parameters, so weakening control characteristics of the motor willbe deterioration. This thesis proposes a strategy of weakening control with voltagefeedback, obtaining the minimizing copper loss and resistance parameter perturbationswhen it runs in the field weakening region. The program of fulx-weaking controlstrategy can improve the robustness of control system, even if the motor’s parametersare changing, the motor can work at the voltage limiting circle.Finally, the EV IPMSM driver control systerm platform using the Infineon’s TriCoreTMTC1782is estibalished. The design of hardware circuit and software arecompleted. And PC software based on Can-bus and designed on Labview is used tocontrol and test the IPMSM drive control system of electric vehicle. The experimentalresults verify the correctness and rationality of proposed IPMSM drive electric vehiclecontrol strategy.