永磁同步电动机变参数控制系统耦合分析

Coupling Analysis of Variable Parameter Control Systemfor Permanent Magnet Synchronous Motor

在永磁同步电机的运行过程中,电机定子绕组电感、永磁体磁链等参数会随着磁路饱和程度的变化而改变,且参数间存在交叉耦合,难以进行线性化分析.于是首先提出了一种考虑磁场饱和以及交叉耦合的电机定子电感和永磁体磁链计算方法,将计算结果拟合得到通用的多项式,可用于计算不同磁路饱和程度下的电机参数.而在进行电机控制时,交、直轴电感和永磁体磁链是控制算法设计的重要依据,直接影响控制系统的性能,为了实时获得精确的电机参数以提高控制性能,设计了基于场路耦合模型的永磁同步电机矢量控制系统,通过实时获取电机参数并应用于控制策略中,实现了变参数控制联合仿真,通过与固定参数控制系统对比,验证了该方法的有效性.

During the operation of permanent magnet synchronous motor(PMSM),the parameters,such as sta-tor winding inductance and permanent magnet flux linkage,will change with the variation of magnetic circuit'ssaturation degree.And there is cross coupling between the parameters.Therefore,it is dificult to carry out lin-earization analysis.In order to consider the cross saturation effect,a calculation method of motor stator induct-ance and permanent magnet flux linkage considering magnetic field saturation and cross coupling is proposed,firstly.The calculation results are fited to a general polynomial,which can be used to calculate motor parametersunder dfferent magnetic circuit saturation degrees.While,d-axis inductance,q-axis inductance and perma-nent magnet flux linkage are important basis for control algorithm design,which directly affect the peformance ofthe control system.In order to obtain accurate motor parameters in real time to improve the control performance,the permanent magnet synchronous motor vector control system based on field circuit coupling model is designed.The system can obtain motor parameters in real time and apply them to the control strategy to realize variable pa-rameter control joint simulation.The effectiveness of this method is verified by comparison with the fixed parame-ter control system.