🍩 Database of Original & Non-Theoretical Uses of Topology

(found 3 matches in 0.001169s)

  1. Induction Motor Eccentricity Fault Detection and Quantification Using Topological Data Analysis (2024)

    Bingnan Wang, Chungwei Lin, Hiroshi Inoue, Makoto Kanemaru
    Abstract In this paper, we propose a topological data analysis (TDA) method for the processing of induction motor stator current data, and apply it to the detection and quantification of eccentricity faults. Traditionally, physics-based models and involved signal processing techniques are required to identify and extract the subtle frequency components in current data related to a particular fault. We show that TDA offers an alternative way to extract fault related features, and effectively distinguish data from different fault conditions. We will introduce TDA method and the procedure of extracting topological features from time-domain data, and apply it to induction motor current data measured under different eccentricity fault conditions. We show that while the raw time-domain data are very challenging to distinguish, the extracted topological features from these data are distinct and highly associated with eccentricity fault level. With TDA processed data, we can effectively train machine learning models to predict fault levels with good accuracy, even for new data from eccentricity levels that are not seen in the training data. The proposed method is model-free, and only requires a small segment of time-domain data to make prediction. These advantages make it attractive for a wide range of data-driven fault detection applications.

  2. Motor Eccentricity Fault Detection: Physics-Based and Data-Driven Approaches (2023)

    Bingnan Wang, Hiroshi Inoue, Makoto Kanemaru
    Abstract Fault detection using motor current signature analysis (MCSA) is attractive for industrial applications due to its simplicity with no additional sensor installation required. However current components associated with faults are often very subtle and much smaller than the supply frequency component, making it challenging to detect and quantify fault levels. In this paper, we present our work on quantitative eccentricity fault diagnosis technologies for electric motors, including physical-model approach using improved winding function theory, which can simulate motor dynamics under faulty conditions and agrees well with experiment data, and data-driven approach using topological data analysis (TDA), which can effectively differentiate signals measured at different eccentricity levels. The advantages and limitations of each approach is discussed. Both methods can be extended to the detection and quantification of other types of electric motor faults.

  3. Topological Data Analysis for Electric Motor Eccentricity Fault Detection (2022)

    Bingnan Wang, Chungwei Lin, Hiroshi Inoue, Makoto Kanemaru
    Abstract In this paper, we develop topological data analysis (TDA) method for motor current signature analysis (MCSA), and apply it to induction motor eccentricity fault detection. We introduce TDA and present the procedure of extracting topological features from time-domain data that will be represented using persistence diagrams and vectorized Betti sequences. The procedure is applied to induction machine phase current signal analysis, and shown to be highly effective in differentiating signals from different eccentricity levels. With TDA, we are able to use a simple regression model that can predict the fault levels with reasonable accuracy, even for the data of eccentricity levels that are not seen in the training data. The proposed method is model-free, and only requires a small segment of time-domain data to make prediction. These advantages make it attractive for a wide range of fault detection applications.