Design And Research Of Performance Test System For Electric Vehicle Drive Motor Based On LabVIEW

As the main power source of electric vehicles,the performance of drive motor directly affects the performance and safety of electric vehicles.At present,the test method for the performance of the driving motor of electric vehicles is not perfect enough to fully simulate the working state of the driving motor in electric vehicles,resulting in the low accuracy of the test data,which is inconsistent with the performance data of the driving motor of actual driving vehicles.This paper takes the performance test of electric vehicle driving motor as the research object,setting up the experiment system of the test of the electric car drive motor performance and accurate control of torque and speed.At the same time,it analyzes the control effect of the constant speed control of the drive motor and the simulation effect of the driving state,verifies the stability of the speed control of the drive motor and simulates the tracking effect of the driving condition.It meets the requirement of driving motor for new energy electric vehicles and provides theoretical basis and technical support for the peers in the field to study the polymorphic drive motor which is more suitable for electric vehicles.The following are the contents and results of the research:1.This article analyzes the structure and characteristics of the electric vehicle driving motor,based on the analysis of force and moment of inertia of the pure electric vehicle,the equivalent torque of the driving motor in the electric vehicle is derived,which lays a solid foundation for the simulation test conditions.The test items for the performance test of driving motor are discussed in depth.The advantages and disadvantages of four driving conditions are esearched and analyzed,including UDDS operating conditions in the United States,NEDC operating conditions in Europe,JC08 operating conditions in Japan,and China’s latest CLTC-P operating conditions,and the test conditions suitable for the performance test of modern driving motor are determined.2.The overall design and module analysis of the test system of electric vehicle driving motor test platform are carried out.According to the real vehicle running environment and system requirements,the specific model parameters of the dynamometer motor and the selection of the highly flexible coupling are given.Aiming at the defects of the triangular frame structure supporting the axle box and the symmetrical locking device,the performance detection characteristics of the drive motor is considered,and the highly rotating supporting axle box and motor are completed.The design of the zero-speed locking device greatly reduces the mechanical vibration generated by the test platform at high speed,and reduces the measurement error caused by the severe vibration of the motor during high-speed operation of the test system.Aiming at the problem of energy loss of the traditional motor test platform,when the dynamometer motor brakes,the braking energy is fed back to the power grid through the energy feedback type variable frequency drive and the DC power module.The hardware platform of the indoor test system is built,and the high consistency between the indoor test and outdoor test environment is realized.3.The performance test process of electric vehicle drive motor are realized,and the preparation of the software function program are completed.In order to ensure the safety of the drive motor performance test process,based on the video acquisition technology of LabVIEW and the remote monitoring of the Web,a remote monitoring scheme for the performance test of the electric vehicle drive motor is designed.The common load control strategy of the drive motor is studied.A fuzzy PID control algorithm based on the constant speed,design a constant speed controller is proposed.The Matlab / simulink modeling simulation analysis results show the start-up adjustment time of the permanent magnet synchronous motor speed adjusted by fuzzy PID is 0.125 seconds,and the speed overshoot is 2.1%.When the load torque changes suddenly,the dynamic speed drop of the speed is 3 rpm,the adjustment time is 0.04 s,the steady-state error 1.7%,indicating that this control algorithm can improve the response speed and the stability of the entire test system to meet the needs of constant speed control of the drive motor.Through the force loading analysis of the split driving conditions,the setting of the torque applied by the dynamometer motor is completed,and the programs of driving condition loading process and working conditions data entry are designed.4.For each completed software module and equipment module,according to the test method of the project,the software integration based on the LabVIEW development environment and the hardware integration of the drive motor performance test platform are carried out.Temperature rise test,efficiency test test,speed accuracy control test,and driving condition simulation test are completed.The test results verified the reliability of the test system,indicating that the test system can achieve accurate control of the speed of the drive motor and performance testing,and also meet the design requirements of the performance test system for the drive motor of electric vehicles.