Design And Implementation Of Test Platform For Electric Vehicle Drive Motor

In the background of environmental pollution and energy scarcity,the development of electric vehicles has become a research hotspot recently.As the power source of electric vehicles,the stability and reliability of drive motors can affect their power,comfort,and safety directly.Drive motor testing is therefore an essential part of electric vehicle development.In this paper,a test platform of drive motors based on LABVIEW is built,which can realize the performance test of drive motors in electric vehicles.The main research contents of the thesis are as follows:Firstly,the overall design of the test platform is based on the current research status of the test platform.According to modular design ideas,we analyze the overall functional requirements and elaborate the specific functions of each module.Combining the advantages and disadvantages of the two basic test platform solutions,the overall test platform solution is determined and the working principle is detailed.Secondly,the hardwares of test platform are selected and designed according to the overall test platform concept.Selections of load motors and couplers are carried out in the real vehicle operating environment and test platform requirements.In order to avoid the energy loss in the test rig,the driver and DC power with energy return are chosen.The water cooler,the environmental compartment,the acquisition module,the speed and torque sensor and power analyzer are selected and analyzed to ensure the consistency of the test platform with the real vehicle road test environment.Again,the measure and control software is designed according to the functional requirements of the software.Firstly,the characteristics of the LABVIEW software and the development process are overviewed.Secondly,the analysis of requirements and the division of functional modules are carried out according to the software development environment.Then the upper computer interface is designed,and through embedded sub-VIs,we can dynamically call the login and management module,the configuration module,the start-up module,the manual module and the automatic module for interface control.The development process and the operating interface of these modules are analyzed.Finally,the module included in the PXI real-time system of the lower computer is programmed to achieve precise control of the load motor and to save the collected data.Finally,the reliability of the test rig is verified by drive motor experiments.In this thesis,the PM6030L100 permanent magnet synchronous motor is selected as the object under test.The speed control experiment of load motor,as well as the temperature rise,load and efficiency experiment are all carried out on the test platform we built.The experimental data are compared with the design value of the motor,which shows that the test platform can accurately measure the performance parameters of the motor under test,verifying the reliability and accuracy of the test platform.