Patent ID: 11898932
Assignee: ZHUZHOU CRRC TIMES ELECTRIC CO. LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. The device for diagnosing a fault in a bearing of a motor according to claim 7, wherein the fault feature extraction unit is configured to:
acquire the minimum value (I_min) of the residual signal from following equation:

I_min=min(I(t)),

wherein I(t) represents a time series of the residual signal, t=1˜N, and N represents the number of sampling points of the residual signal;
acquire the effective value (I_rms) of the residual signal from following equation:, I_rms
   =
   
    
     
      1
      
       N
       -
       1
      
     
     ⁢
     
      (
      
       
        ∑
        
         t
         =
         1
        
        N
       
       
        
         I
         2
        
        (
        t
        )
       
      
      )
     
    
   
  
  ;
 

acquire the maximum value of the amplitude the fault feature frequency sequence of the bearing from following equation:

I__max=max(I_(n)),

wherein I_(n) represents the amplitude of the fault feature frequency sequence of the bearing;
acquire the peak-to-peak value of the amplitude of the fault feature frequency sequence of the bearing from following equation: I__peark=I__max−I_min; and
acquire the crest factor of the amplitude of the fault feature frequency sequence of the bearing from following equation:

I__crest=I_max/I_rms