Fault Diagnosis and Detection in Industrial Motor Network Environment Using Knowledge-Level Modelling Technique

Table 2

Assessing rotor condition [5].

Amplitude difference (−dB)	Rotor condition
>50	In excellent condition
44–50	Good condition
38–44	Moderate condition
32–38	Rotor bar crack may be in initial stage or high resistance in joints
26–32	Two rotor bars may be cracked or high resistance in joints
20–26	Several bars cracked or rings end
<20	Multiple broken bars