A Novel Scheme on Fault Diagnosis of Induction Motors using Current per Voltage Bode Diagram

使用電壓電流波德圖之感應馬達異常診斷的新穎方法

Widagdo Purbowaskito ； 藍振洋(Chen-Yang Lan) ； 劉孟昆(Meng-Kun Liu) ； Kenny Fuh

《中國機械工程學刊》 41卷6期 (2020/12) Pp. 781-790

摘要

Unexpected failure of industrial motors is costly in production loss and is time consuming in repairing process. Motor current signature analysis has been used for fault diagnosis and detection but this method is depended on the voltage input quality and motor loading level in order to achieve accurate results. In this study, a novel motor fault detection and diagnosis method is proposed. The method is a preliminary study of a new approach in model-based fault detection and diagnosis method. It works by analyzing the bode diagram of the induction motor that will be generated by using current per voltage ratio in frequency-domain. Five industrial induction motors with three different conditions are the examples in this study. Two induction motors are in healthy condition, two induction motors are operated under misalignment/unbalance fault, and one induction motor is operated under bearing fault condition. The study results show that the proposed bode diagram approach can be used to detect the motor faults and the difference patterns appeared are visibly notable for the fault detection and diagnosis (FDD) of motor condition.

關鍵字

bode diagram ； fault detection and diagnosis ； frequency-domain ； induction motor ； MCSA

並列摘要

本研究旨在探討感應馬達之異常偵側與診斷，相較於傳統的振動頻譜分析方法或電流特徵頻譜分析方法，文中提出以馬達電壓電流所產生之波德圖來判斷感應馬達之狀態。將感應馬達轉動設備視為一個系統，其電壓為系統之輸入，電流為系統之輸出。藉由產生之感應馬達電壓電流波德圖的樣式模型，用來判斷馬達之狀態。波德圖主要描述一系統的輸入輸出之關係。因此本方法也可視為模型式之異常偵檢方法，期改善電流特徵頻譜分析中電壓雜訊之干擾。先期應用於五組感應馬達設備，其中兩組為健康設備，兩組為具有不平衡／不對心之異常設備，一組為有軸承異常之設備。其結果顯示不同狀態的馬達顯示出明顯不同之波德圖的樣式模型。