Research On A Wide Speed Range Drive System For Switched Reluctance Motors In Electric Vehicles

Electric vehicle motor controller technology is its core competency,and the motor controller performance of electric vehicles is closely related to the performance of the engine motor controller.Guided by the "carbon neutral" and "peak carbon" policies,the trend of vehicle electrification has taken shape.Domestic and foreign vehicle companies are looking for a motor with low price,wide range of speed regulation and stable performance as the drive motor for electric vehicles.The characteristics of Switched Reluctance Motor are perfectly adapted to electric vehicles and are well suited as the power core of next-generation electric vehicles.The work done in this paper is as follows:First of all,this paper describes the development trend and the prospect of the drive system of electric vehicles.First,it reviews the research background and significance of switched reluctance motor drive,summarizing the research status of electric vehicle drive and switched reluctance motor drive,and sorting out the existing problems in the current research.It then reviews the problems in switched reluctance motor(SRM)speed control strategy and their solutions.Second,it is designed to verify its principle and properties.Firstly,the basic structure and working principle of the SRM are outlined.Based on this,the magnetic coupling,current and torque of the SRM are derived,the mathematical model is constructed,the magnetic coupling and torque are analysed,and the structure of the converter is described.The basic control mode is introduced,the flux and torque are analysed,and the advantages and disadvantages of various control modes of switched reluctance motor are compared by introducing the converter structure commonly used at present.The advantages and disadvantages of different control modes of a switched reluctance motor are compared.The combination of APC control and low rpm CCC control will be chosen as the basis for the following works.The simulation model of the SRM drive system was built up again in MATLAB/Simulink,including the power supply,the drive control,the SRM and other modules.After running the simulation on this model,it can be seen that under the CCC control method,the speed control performance and dynamic response are relatively good at low speeds,and using the APC method at high speeds can achieve better speed and torque static and dynamic effects.Then,in the software design section,the main program of the SRM drive control system was sorted and introduced.The key subprograms such as DSP initialization,display,position detection,ADC interrupt,and control mode selection were summarized and introduced,laying the foundation for the following motor experiments.Finally,experimental research was conducted on the SRM drive system experimental platform,testing the faults before the SRM experiment,and conducting acceleration and deceleration tests on simulated electric vehicle driving scenarios;And the operation of the motor with sudden load changes was tested,and the motor speed response was detected.Experimental verification shows that the drive system designed in this article can effectively control the SRM’s speed.