Optimized Design And Control Of The Integrated Driving And Charging System Based On Doubly Salient Motor

The integrated driving and charging system of electric vehicles uses the driving system to reconstitute the on-board charger,which not only improves the utilization rate of electric vehicle drive system but also saves the weight and volume of the additional on-board charger and improves the convenience of charging.The integrated driving and charging system based on doubly salient electromagnetic motor（DSEM）reuses the excitation windings and armature windings of DSEM as the filter inductor of the on-board DC/DC converter and the three-phase PWM rectifier of the system,which not only solves the excitation loss problem in the traditional DSEM driving control application but also realizes the function of rapid charging.However,the excitation and armature windings of DSEM are different from the filter inductors of the on-board DC/DC converter and the three-phase PWM rectifier,and the coupling between the windings produces the output torque pulsation and excitation current fluctuations during the charging process.The optimized design and control technology of the integrated driving and charging system based on DSEM are produced in this paper.Firstly,the basic working principle of the integrated driving and charging system is introduced,including the mathematical model of 12/10-pole DSEM and three-phase rectifier with armature windings in charging mode and the working principle of the DC/DC converter based on split-field windings.The motor winding parameters are optimized due to the analysis of the constraint relationship of DSEM winding and the influence of winding inductor on system performance,where the problem of system power limitation is solved and the optimized control strategy is proposed to reduce the coupling degree of the system.In addition,the SVPWM-based sine wave driving method is applied to 12/10 pole DSEM,which not only reduces the torque pulsation and excitation current fluctuation of the motor but also facilitates the integration with the control strategy of the rectifier in charging mode,realizing the integration of driving and charging control strategy.Then,the model of 12/10-pole DSEM based on Maxwell and the MATLAB model of the integrated driving and charging system are constructed,and the dynamic and steady-state performance of the system and the torque pulsation and excitation current fluctuation in the driving and charging mode are analyzed through simulation.Finally,the experimental platform based on DSP and CPLD of the integrated system is designed and the software of DSP and CPLD is written.The dynamic and stability experiment of the system is carried out based on the new 12/10-pole DSEM,the experimental results of which show that the new system has good dynamic and stability performance,and the optimized control strategy can significantly improve the excitation current fluctuation and torque pulsation.