Design And Implementation Of Vehicle IPMSM Drive System Based On DSP

Under the rapid development of the global economy,the new energy vehicle system and automobile industry is booming.In view of the advantages of environmental protection such as non-pollution and energy-saving,electric-powered vehicles are receiving widespread attention from new energy enterprises and countries around the world.The development of electric motor and electronic control system plays an irreplaceable role in the process of changing from the former fuel vehicle to the current special power charging electric vehicle.How many kilometers the vehicle can run or how long it can run is one of the key criteria for testing the electrically driven vehicles,which depends primarily on battery capacity,the efficiency of the electric machine and the operation effect of the internal control software and hardware.With the comparison of all kinds of motors,based on the characteristics of high power factor and high efficiency of permanent magnet machine and the advantages of rare earth resources in China,most of the domestic electric machine systems for vehicles are mainly developed around permanent magnet machines and control motor hardware,software and so on.Therefore,this paper selects the interior permanent magnet motor control system for special vehicles,analyzes it from theory and experiment,and conducts in-depth research on its model,control algorithm and test system.the principle and technical requirements of a permanent magnet motor drive system for a vehicle,namely the technical requirements of the motor and the technical requirements of the electronic control,were introduced in detail,and then the modeling of the IPMSM was analyzed and discussed.The basic principle of SVPWM was analyzed.The scheme of using MTPA control in the constant torque area and field weakening control based on voltage feedback in the constant power area was determined for the system.The simulation data and waveform theoretically verified the feasibility of the scheme.the hardware design part of the experimental control system was introduced.The main circuit parameters of the experiment were introduced.According to the parameters,the IGBT selection of the inverter,the selection of the supporting capacitor and the selection of the voltage and current sensors were analyzed and designed.From the hardware design of the main control board,the design of the system assembly,sampling circuit,hardware fast protection circuit,revolving detection circuit and CAN interface circuit were introduced.Then,the system software structure was introduced,and the two main interrupts used in the software,EPWM interrupt and timer interrupt were explained respectively.From the detailed processing of the software,the speed detection processing function was mainly analyzed.Finally,the design of the 200 kW vehicle IPMSM experimental platform and the formulation and implementation of the experimental scheme were introduced.The basic structure of the experimental system was briefly introduced.For different experimental needs,the experimental platform needed to be changed accordingly.The specific experimental schemes of motor and electric control were introduced.The measurement of cold DC resistance and cold insulation resistance,as well as the no-load experiment,temperature rise test and overload test were introduced and analyzed.The experimental results showed that the experimental system had superior performance and convenient operation,and can fully meet the requirements of scientific research and batch factory experiments.