Motor fault diagnosis based on multisensor-driven visual information fusion.

To need of accurate motor fault diagnosis in industrial system, we propose a fault diagnosis framework that utilizes motor current and electromagnetic signals, combining them with a self-attention-enhanced capsule network for enhanced signal analysis and accuracy. Firstly, the original signal extracted by multiple sensors is constructed into a symmetric point mode (SDP) image, and the visual fault information of different sensors and fusion signals of different motion health states are obtained by the proposed multi-channel image fusion method. Then, the capsule network, combined with self-attention, extracts spatial features from the high-dimensional tensor of the multi-channel fused image for adaptive recognition and extraction. Subsequently, advanced feature vector information is obtained through softmax for diagnosis. Diagnosis results of several datasets indicate that the developed diagnosis framework with compressed image information can availably identify 8 kinds of motor fault states under various loads, and the fault diagnosis rate is as high as 99.95 %, it is helpful for low cost and high-speed diagnosis of motors. In addition, by learning multiple sensor signals in the same state, it obtains stronger robustness and effectiveness than a single signal model. • The symmetric dot pattern (SDP) is used to convert a one-dimensional signal into a two-dimensional visual image. • A multi-sensor fusion (MSF) method based on multi-channel SDP images is proposed. • A multi-channel capsule network based on self-attention mechanism is developed. • The proposed method is verified by fusion diagnosis of multi-channel isomorphic spatial information and heterogeneous information. [ABSTRACT FROM AUTHOR]