汽车轮毂电机的SMC+MTPA控制策略分析

Analysis on SMC+MTPA control strategy of automobile hub motor

针对轮毂电机使用传统PI控制在负载突变时达到稳定出现抖动的问题,提出轮毂电机控制系统速度环采用滑模控制器(SMC)和最大转矩电流比(MTPA)控制.通过对速度环分别采用比例积分(PI)和输入参考电流为0、PI和MTPA以及SMC和MTPA控制下系统响应情况仿真,得到了不同控制方式下电机定子三相电流、输出电磁转矩、电机转速等工况并进行对比分析.仿真结果表明,与常规PI控制方式相比,采用SMC和MTPA控制能有效提升系统稳定性,降低负载突变状态下系统抖动,减小超调量,同时提升电流的利用率,能较好满足轮毂电机工况要求.

Aiming at the jitter of the hub motor when traditional PI control is used to achieve stability with load mutation,this paper proposes a solution that speed loop of hub motor control system is controlled by sliding mode controller(SMC)and maximum torque per ampere(MTPA).Then,by using proportional integration(PI)and input reference current 0,PI and MTPA as well as SMC and MTPA control,respectively to simulate the response of speed loop system,the paper obtains motor stator three-phase current,output electromagnetic torque,motor speed and other working conditions under different control modes,and also makes comparative analysis on the working conditions.Simulation results show that compared with the conventional PI control method,the use of SMC and MTPA control can effectively improve the stability of the system,reduce the system jitter in the state of the load sudden change,decrease overshoot,and at the same time improve the current utilization rate,which can better meet the requirements of hub motor working conditions.