Research On Switched Reluctance Drive System For Electric Vehicle

Firstly,this article introduces the development background of electric vehicles,analyzes various commonly used motors for new energy vehicles,summarizes the unique advantages of switched reluctance motors for electric vehicles,and analyzes and introduces the drive control of switched reluctance motors.The research status of the system,and based on this to determine the content of research,in order to broaden the speed range of the switched reluctance motor for electric vehicles and to build a lightweight,small-sized drive system proposed solutions.Secondly,the composition and working principle of the switched reluctance motor are introduced,and the control of the switched reluctance motor for electric vehicles is divided into two parts: the current intermittent control method and the current continuous control method.Three classic control methods were introduced in the current discontinuous conduction control section: current chopping control(CCC),voltage chopping control(CVC),angle position control(APC),and the combination of voltage chopping and angular position A low-to-medium-high speed switching scheme is open-loop CCC-APC hybrid crossover control.In the current continuous conduction control part,the parameter analysis,characteristic analysis and analysis of advantages and disadvantages under this operating mode are given,and a switch is proposed to detect the abnormal section of speed increase as the CCC-APC hybrid cross control to current continuous conduction control mode.Rules,and adding "virtual gear",efficiency tracking two control strategies as an aid.A variable control module was constructed to switch the control mode to this module.Smoothness and correct switching between control modes are achieved.Then,the hardware circuit of the drive control system was designed,including the controller,power converter,and peripheral circuits.In designing the power converter,a power converter is constructed by using two MOSFETs in parallel as a main switching device,and a design rule for parallel current sharing is given.A solution is proposed and a design is based on this.The foldable power converter structure enables the drive system to be lower in cost,smaller in size and good in heat dissipation.Then,the software structure of the drive control system is designed,and the complete main program,initialization subroutine,self-startup subroutine,position detection program,current chopper program,shift angle subroutine,cross control subroutine,and virtual gear are given.Subroutines,exception determination subroutines,etc.Implementation logic.Finally,an experimental platform was built to verify the parallel connection of MOSFETs,thermal stability of the power converter,intermittent conduction of current and continuous conduction control.The experimental results show that the power converter design rules proposed in this paper have good current sharing effect,the heat dissipating structure of the power converter is good,and the control algorithm significantly widens the speed range of the switched reluctance motor for electric vehicles,and improves the output speed of the motor.In the case of high efficiency and smooth switching.