| At present,the market demand and attention rate of low-speed electric vehicles is high.However,they have problems such as poor power performance and economic performance,and low efficiency of the drive system.And relevant manufacturers have not carried out research and development works referring to actual driving circumstances of electric vehicles.In view of this,in order to improve the power performance,economic performance and drive system efficiency of low-speed electric vehicles.In this paper,the design of drive motor control system and the research of motor parameter matching have been carried out for low-speed electric logistics vehicles.Details are as follows:Firstly,based on the actual driving characteristics of the electric logistics vehicles,the schemes of motor drive system for logistics vehicle has been determined,including:the scheme of power of the motor drive system,the scheme of the drive motor control system,and the scheme of the drive motor control.The mathematical model of driving motor of electric logistics vehicles and the principles of coordinate transformation,vector control and space vector pulse width modulation have been analyzed.The scheme of indirect field oriented vector control has been improved to meet the engineering.On this basis,the simulation model of motor control system has been built based on Simulink software,and the simulation analysis under the given working conditions has been carried out.The simulation results show that the improved indirect magnetic field oriented vector control method has effective control performance for the asynchronous motor of electric logistics vehicles,and meets the performance requirements of the logistics vehicles drive system.Then,based on the scheme of driving motor control system for electric logistics vehicles,the hardware circuit of the electric logistics vehicles motor control system with TMS320F2812 DSP as the main control chip has been designed,which guarantees the performance requirements of the control system.On the basis of hardware system,the software program of the control system has been designed based on the CCS3.3 development platform,which ensures the excellent control operation of the control system.Next,in city driving cycle as the basis,the research and analysis of the typical driving roads of logistics vehicles have been carried out,and the operating conditions driving cycle of electric logistics vehicles have been constructed.According to the three indexes of maximum speed,acceleration time and conventional speed,the traditional method of parameters primary selection has been optimized,the parameters of motor have been primary selected by using the optimized method,and the optimization matching target of motor parameters has been analyzed theoretically.On this basis,the simulation analysis of primary parameter matching under the driving cycle has been carried out by using ADVISOR software.According to the primary parameter simulation results and design indexes the most suitable motor parameters have been matched,and simulation analysis of the running of logistics vehicles has been carried out by using the chose parameter.The simulation results show that the matched driving motor meets the dynamic and economic performance requirements of the logistics vehicles,and the operation of the logistics vehicles meets the actual working requirements.Finally,the driving motor performance test platform has been built according to the designed drive motor control system and the matched motor,and the control system performance test and the logistics vehicles performance test have been carried out.In the control system performance test,the motor speed and torque dynamic response characteristics under different load torques have obtained by simulating road resistance with load torques.The test results show that the control system developed accords with the actual operation of the motor of the logistics vehicles,and basically consistent with the simulation results in ADVISOR,which verifies that the control system has effective performance.In the performance test of the logistics vehicles,the mileage prediction model between the mileage of the logistics vehicles and the battery SOC has been established.According to the test results,the estimated mileage is in accordance with the design specifications,which is close to the simulation results in ADVISOR.It is verified that the driving motor control system and the matched driving motor can meet the driving performance requirements of electric logistics vehicle. |
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