Current signal-based motor bearing fault diagnosis method
A fault diagnosis and current signal technology, applied in mechanical bearing testing, spectral analysis/Fourier analysis, etc., can solve the problems of false negatives, false positives, etc., to improve the significance, improve the signal-to-noise ratio, improve the objectivity and The effect of accuracy
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Embodiment 1
[0074] as attached figure 1 to the attached image 3 As shown, an embodiment of a bearing fault diagnosis method based on a current signal specifically includes the following steps:
[0075] A) Model training phase
[0076] S101) acquiring multiple sets of motor current history signals under different bearing fault states (corresponding to different bearing fault types) as a training sample data set of the model;
[0077] S102) extracting harmonic signals from the training sample data set, eliminating fundamental frequency and harmonic signals from the original motor current history signal, and obtaining residual signals;
[0078] S103) perform time domain and frequency domain analysis on the residual signal obtained in step S102), and extract the fault characteristic index of the bearing;
[0079] S104) Based on the fault characteristic index (vector) of the bearing extracted in step S103) and combining with the bearing fault type, training is performed to obtain a bearing...
Embodiment 2
[0124] as attached Figure 4 As shown, an embodiment of a bearing fault diagnosis device based on the method described in Embodiment 1 specifically includes: a current signal acquisition unit 1 , a residual signal acquisition unit 2 , a fault feature extraction unit 3 and a fault diagnosis model unit 4 . When the unit is in a diagnostic state:
[0125] The current signal acquisition unit 1 acquires the real-time signal of the motor current;
[0126] The residual signal acquisition unit 2 extracts the harmonic signal from the motor current real-time signal acquired by the current signal acquisition unit 1, eliminates the fundamental frequency and the harmonic signal from the original motor current real-time signal, and obtains the residual signal;
[0127] The fault feature extraction unit 3 performs time domain and frequency domain analysis on the residual signal obtained by the residual signal acquisition unit 2, and extracts the fault feature index of the bearing;
[0128]...
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