电动汽车用永磁同步电机超前角弱磁控制

摘要

由于永磁同步电机(PMSM)具有体积小、功率密度、效率及功率因数高等特点,目前在电动汽车驱动系统中具有较高的应用价值.针对电动汽车用PMSM基速以上弱磁控制时存在的电流调节器饱和、不可控问题,设计了基于转子磁场定向带电压外环控制的电流超前角弱磁控制方法,实现了基速以下恒转矩调速和基速以上恒功率弱磁控制,以及两种工作模式的平滑、稳定过渡.在PMSM d,q轴数学模型的基础上,分析了其弱磁控制原理,设计了其超前角弱磁控制方法.利用Matlab对设计的PMSM超前角弱磁控制方法进行了仿真验证,通过实验证明了该方法的有效性.%Permanent manet synchronous motor(PMSM) has many advantages in the motor driving system of electrical vehicle because of its excellent performances, such as small cubage, great power density and high efficiency. This paper describes a novel flux-weakening control method for the PMSM.It is implemented based on the outer voltage regulation loop which regulates the phase angle of current leading EMF in order to prevent the saturation and uncontrollable status of the current regulator. Based on the d,q mathematical model of the PMSM,this dissertation ana-lyzes the principle of the flux-weakening, then a new method which called current lead angle flux-weakening control for PMSM based on PI current regulator is presented. Furthermore, in this thesis the air-gap flux orientation for flux-weakening control is analyzed and a block diagram of the control system is given.The simulation results in-dicate the feasibility and validity of this scheme.