摘要
表贴式永磁同步电机转速可以由电机反电势和磁链的比值进行估算,而永磁同步电机在运行时,永磁体磁链会因为交叉耦合和饱和效应而非线性实时变化,直接影响无位置传感器控制中电机转速和位置的估算。本文提出了一种磁链误差滑模观测器,通过重写定子磁链方程构建磁链误差观测器,由观测的磁链误差对永磁体磁链初值进行在线修正,利用修正得到的磁链值和反电势估算电机转速。该方法可以有效消除由于磁链扰动以及磁链初值精度不足而导致的转速及位置估算误差,提高永磁同步电机无位置传感器控制的转速和位置估算精度及抗干扰能力。仿真和实验验证了方法的正确性和有效性。
The speed of surface mounted permanent magnet synchronous motor(PMSM)can be estimated by the ratio of back-electromotive force(EMF)to flux linkage.However,permanent magnet flux linkage varies nonlinearly in real-time due to cross-coupling and saturation effect when PMSM is in operation,which directly affects the estimation of motor speed and position in sensorless control.In this paper,a flux linkage correction sliding mode observer(FC-SMO)is proposed,which is constructed by rewriting the stator flux equation.The flux linkage of the permanent magnet was corrected online,and the motor speed was calculated by using the modified flux linkage and back EMF.The speed and position estimation error caused by flux disturbance and the accuracy of flux initial value can be effectively eliminated,which contributes to improving the speed and position estimation accuracy and anti-interference ability of PMSM position sensorless control.Simulation and experiment results verify the correctness and effectiveness of FC-SMO.
作者
吴建华
吴航
WU Jian-hua;WU Hang(College of Electrical Engineering,Zhejiang University,Hangzhou 310000,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2021年第4期16-22,31,共8页
Electric Machines and Control
基金
国家高技术研究发展计划(863计划)(2011AA11A101)。
关键词
永磁同步电机
无位置传感器控制
滑模观测器
磁链初值误差
磁链修正
磁链误差观测器
permanent magnet synchronous motor
position sensorless control
sliding mode observer
initial value error of flux linkage
flux linkage correction
flux linkage correction sliding mode observer
