变频调速异步电动机系统动态调速过程中的故障诊断研究

项目名称： 变频调速异步电动机系统动态调速过程中的故障诊断研究

项目编号： No.60874109

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 数理科学和化学

项目作者： 刘振兴

作者单位： 武汉科技大学

项目金额： 31万元

中文摘要： 随着变频调速异步电动机系统的日益普及，因电动机和变频器故障而造成的停工停产、设备损坏等潜在风险显著提高。为了提高它们的等效可用率，减少故障损失，需要有效可靠的综合诊断手段来诊断早期故障，特别是在动态调速模式下的故障诊断。针对变频调速异步电动机系统动态调速过程中电流主成分（可以理解为时频变化的基波）和故障特征频率成分频谱容易重叠、故障特征容易淹没等问题，提出了一种基于时频分析的电动机变频调速动态运行模式识别方法，综合利用最大重叠小波包变换(与广义Fourier变换能实现复杂多分量信号的分离，为电动机变频调速动态运行模式识别提供了一种有效的新途径；通过在IGBT等效电路设置附加电阻的形式，建立了基于simulink的变频调速异步电动机系统故障仿真平台，能实现不同运行模式下IGBT开路、短路、高阻等状态的仿真；通过与Park's 矢量方法、Hilbert方法对比，获得了矢量图形诊断器件故障的新方法。搭建了实验平台，在该平台上进行试验能验证本方法的有效性。取得的成果在变频调速异步电动机系统故障诊断领域具有重要的应用前景。

中文关键词： 变频调速;鼠笼式异步电动机;最大重叠小波包(MODWPT);广义Fourier变换;故障诊断

英文摘要： As the asynchronous motor frequency control system becomes more and more popularized, risks such as production stoppage and equipment damages resulted from breakdown of motors and frequency converters are also increased. In order to increase the equivalent availability, and decrease the damaging losses, we need effective and reliable comprehensive diagnosing method to diagnose the fault in the early stage, especially the fault diagnosis under the mode of dynamic speed control. This essay presents motor frequency control dynamic operating mode identification method which is based on the time frequency analysis, directing at solving problems like the principal current component, (which also means the fundamental wave of time-frequency variation), in the course of dynamic speeding and fault feature frequency component spectrum are easy to overlap and the fault feature is easy to be overwhelmed etc. Comprehensively utilizing maximum overlapped wave packet conversion and Fourier conversion can separate complex multi component signals, which is a new and effective method for motor frequency conversion dynamic operating mode recognition. Through setting up additional resistance in the IGBT equivalent circuit, fault simulation platform of asynchronous motor frequency control system based on Simulink is established. It can realize the simulation under such conditions of IGBT open circuit, short circuit and high resistance in different operating mode. Through being compared with Park’ vector method and Hilbert method, a new method of vector graphics diagnosing equipment fault is figured out. An experiment platform is set up. The effectiveness of this method can be verified through tests on this platform. The result achieved has broad prospect in the field of fault diagnosis of asynchronous motor frequency control system.

英文关键词： frequency converter;squirrel cage induction motor;MODWPT;generilized Fouriertransform;fault diagnosis