Multiscale Kernel Based Residual Convolutional Neural Network for Motor Fault Diagnosis under Nonstationary Conditions

Ruonan LIU, Fei WANG, Boyuan YANG*, S. Joe QIN

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

234 Citations (Scopus)


Motor fault diagnosis is imperative to enhance the reliability and security of industrial systems. However, since motors are often operated under nonstationary conditions, the high complexity of vibration signals raises notable difficulties for fault diagnosis. Therefore, considering the special physical characteristics of motor signals under nonstationary conditions, in this article, we propose a multiscale kernel based residual convolutional neural network (CNN) for motor fault diagnosis. Our contributions mainly fall into two aspects. First, we notice that each motor fault category has various patterns in vibration signals due to the changing operational conditions of the motor. To capture these patterns, a multiscale kernel algorithm is applied in the CNN architecture. Second, since the motor vibration signals are made up of many different components from different transfer paths, they are very complex and variable. To enable the architecture to extract fault features from deep and hierarchical representation spaces, sufficient depth of the network is needed, which will lead to the degradation problem. In the proposed method, residual learning is embedded into the multiscale kernel CNN to avoid performance degradation and build a deeper network. To validate the effectiveness of the proposed networks, a normal motor and five motors with different failures are tested. The results and comparisons with state-of-the-art methods highlight the superiority of the proposed method.
Original languageEnglish
Article number8842598
Pages (from-to)3797-3806
Number of pages10
JournalIEEE Transactions on Industrial Informatics
Issue number6
Publication statusPublished - Jun 2020
Externally publishedYes

Bibliographical note

This work was supported by the National Science and Technology Major Project (2017-I-0001-0001)


  • Deep learning
  • motor fault diagnosis
  • multiscale kernel convolutional neural network (MK-CNN)
  • residual learning


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