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研究生: 朱展良
Chu, Chan-Liang
論文名稱: 應用捲積神經網路之三相感應馬達轉子故障診斷系統
Diagnosis System of Rotor Fault for Three Phase Induction Motor Based on Convolutional Neural Networks
指導教授: 陳建富
Chen, Jiann-Fun
學位類別: 碩士
Master
系所名稱: 電機資訊學院 - 電機工程學系
Department of Electrical Engineering
論文出版年: 2019
畢業學年度: 107
語文別: 英文
論文頁數: 65
中文關鍵詞: 感應電機加速規故障診斷1D-捲積神經網路
外文關鍵詞: Induction motor, accelerometer, faults analysis, 1D- Convolutional Neural Networks
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  • 人工神經網路已經被廣泛的應用於馬達診斷的領域中,本文運用深度學習架構的1D-捲積神經網路來提取特徵並作特徵分類來達成診斷。
    本論文主旨在於使用一套診斷系統來辨識出三相感應電機轉子斷條故障。利用加速規取得震動訊號後,經由快速傅立葉轉換將時域訊號轉換為頻域訊號。獲得之訊號經過主成份分析法做適當的維度選擇,最後基於1D-捲積神經網路進行分析分類。本實驗擷取四種不同轉子斷條狀態下的震動訊號,所有資料被分為兩組用來訓練及測試1D-捲積神經網路機制,轉子情況包含無缺陷及三種故障狀態。本實驗使用一15千瓦三相感應馬達為實驗項目,實驗結果證明本方法可以有效的診斷馬達的四種不同轉子斷條狀態,其中第一部分實驗結果得到最佳辨識率與最小誤差率分別為99.30%及3.54%,且預測模型也有高達分別為99%和98%的精密度和召回率,而第二部分實驗結果得到最佳辨識率與最小誤差率分別為99.30%及2.84%,且預測模型也有高達99%的召回率。

    Artificial neural networks have been widely used in the field of motor diagnosis. This study uses the 1D-convolution neural network of deep learning architecture to extract and classify features to achieve diagnosis.In this thesis, a fault diagnosis system is proposed to perform rotor bar fault detection in three-phase induction motors. Vibration signal is acquired by accelerometers and the signal is transformed from time domain to frequency domain via Fast Fourier Transform (FFT). The transformed signals are processed by Principal Component Analysis(PCA), and based on 1D-convolution neural network for analysis and classification. The rotor condition includes no defects and three fault conditions in this study. All data is divided into two groups for training and testing 1D-convolution neural networks. This study uses a 15 kW three-phase induction motor as a test case. The first part of the experimental results , that the best recognition rate and loss rate are 99.30% and 3.69%, and the model has high precision and recall which about 99% and 98%. The second part of the experimental results using oversampling, that the recognition rate and loss rate can achieve 99.30% and 2.84%, and the model has high recall value about 99% .

    摘 要 I Abstract II 誌謝 III Contents IV List of Figures VI List of Tables VII CHAPTER 1 Introduction 1 1.1 Background and Motivation 1 1.2 The Organization of Thesis 4 CHAPTER 2 Related Theories 5 2.1 Fast Fourier Transform 5 2.1.1 Fast Fourier Transform Algorithm 6 2.1.2 Leakage Effect 7 2.1.3 Aliasing Effect 8 2.1.4 Picket-Fence Effect 9 2.2 Principal Component Analysis 10 2.3 Convolutional Neural Network 12 2.3.1 Basic Theory of CNN 12 2.3.2 Basic Theory of one-dimensional CNN 18 CHAPTER 3 Experimental Method 19 3.1 Measuriement System 19 3.2 Type of Rotor Fault 22 3.3 Fault Diagnosis System 23 3.3.1 Data Pre-processing 24 3.3.2 Feature Construction 26 3.3.3 Normalization 28 3.3.4 Feature Extraction 29 3.3.5 Train, Test and Validation Phase 29 3.3.6 Determine the number of layers in CNN model 31 CHAPTER 4 Experimental Results 32 4.1 Database of Experiment 32 4.2 System Recognition Results and Model Evaluation Index 33 4.2.1 The first part of the experimental database 35 4.2.2 The second part of the experimental database 47 4.3 Evaluation and Comparison of Result and Discussion 55 CHAPTER 5 Conclusions and Future Works 59 5.1 Conclusions 59 5.2 Future Works 60 References 61

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