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永磁同步电机最大的优势在于其简单的结构,低廉的生产成本以及稳定的运行状态。本文的主要研究工作基于相坐标系,建立永磁同步发电机定子绕组匝间短路、转子磁场损失的数学模型,通过这些MATLAB程序,对系统进行仿真分析。
本文首先对永磁同步发电机绕组故障理论进行了研究,重点对永磁同步发电机的匝间短路故障进行讨论与分析。然后介绍了基于dq坐标系下的永磁同步电动机的数学模型。通过不同坐标系下的数学变换,可以将复杂的变系数微分方程转换为较为简单的常系数微分方程。由此建立了基于坐标系的永磁同步发电机定子绕组匝间短路、转子磁势损失的数学模型。
然后永磁同步发电机绕组故障的检测方法的研究,在永磁同步电机坐标系数学模型的基础上,进一步介绍了永磁同步发电机绕组故障的数学模型进行故障特征提取以及故障检测。采集电机达到稳定状态之后,其定子绕组故障后的电流信息和电压信息。然后通过基于坐标变换的方法实现电机电流电压在不同坐标系下的计算。
最后通过MATLAB/Simulink实现永磁同步电机的仿真模型,对不同匝数下永磁同步电机短路时故障电流,不同匝数下永磁同步电机短路时故障q轴电流,不同匝数下短路时永磁同步电机的q轴电流谐波,匝间短路时的Park矢量轨迹以及磁势损失进行了仿真分析。仿真结果表明,基于q轴电流谐波的特征分析可以精确有效的诊断出电机的故障。
永磁同步电机(PMSM,permanent magnet synchronous
motor)的基本结构主要包括定子、转子以及端盖三个主要模块。其中转子磁路结构是永磁同步电机与其它电机最主要的区别,其在很大程度上决定了永磁同步电机的实际性能指标。在一般情况