Research On The Key Technologies Of Drive Control System For Electric Vehicle PMSM

As China’s rapid economic growth in recent years, the demand for energy isgrowing up, and emissions caused by fuel vehicles has become a major cause ofpollution of urban air. Under the dual pressure and to meet the current demand in China,paying great efforts to develop electric vehicle has become an important developmentdirection of China’s automobile industry. There are still some gaps between thetechnical level of China’s electric vehicle and the international advanced technology,especially in vehicle design, structure, system control and other aspects. This paperchoose interior permanent magnet synchronous motor(IPMSM) used in electric vehicleas the object to analyze and research the key technologies in electric vehicle’s drivecontrol systems, control programs and weakening control, and finally complete thedrive control system’s design.Firstly, paper builds a mathematical model of permanent magnet synchronousmotor on the d-q coordinate using Clarke transformation and Park transformation. Onthe basis of this mathematical mode, this paper construct the program of field orientedcontrol (FOC) in which id=0and maximum torque per ampere control(MTPA) whenthe motor is running below the base speed, as well as the program of flux-weakeningcontrol when the motor is running above the base speed.Secondly, this paper carry out in-depth analysis and research of the program offield oriented control (FOC) in which id=0and maximum torque per amperecontrol(MTPA) for IPMSM, and respectively to establish a simulation model of the twocontrol schemes. Using simulation software-Matlab/SimuLink to compare and analyzethese two programs, the paper obtains the advantages and disadvantages and applicableconditions of these two control strategies.Thirdly, research the the program of flux-weakening control when the IPMSM isrunning above the base speed. In traditional flux-weakening control, the increase ofmotor current cause the change of temperature and the degree of magnetic saturationand other motor parameters, and finally alter the flux-weakening control’s effect ofIPMSM. The paper proposes a robustness of weakening control strategy, and the motorcan achieve minimal copper loss when it runs in the field weakening region, althoughthe motor’s parameters is changing.Finally, build the hardware platform based on the Infineon’s32-bitmicrocontroller-TC1767and complete the design of the drive circuit and control circuit.To accordance with the needs of the PMSM’s drive control system used for electricvehicle, using C language to complete the appropriate software programming. At last,testing and analyzing the experimental results to verify the rationality of the entiresystem design.