Many studies have shown that faults in a stator or rotor generally show Motor Current Signature Analysis (MCSA) spectrum side band frequencies around the mains frequency (50 or 60 Hz) and also at higher harmonics. A developing failure is typically observed as side bands of machine speed around the mains frequency. The first “side band amplitude to mains frequency amplitude” ratio is taken as a failure trend indication. Expressed in decibels (dB), a value of –40 to –35 dB or less is generally regarded as a threshold above which motor repair is imminent.
This article briefly explains the application of Motor Current Signature Analysis and goes on to describe how to apply SKF @ptitude Analyst’s Derived POINT functions to compute a failure
trend.
Comments
0 comments
Please sign in to leave a comment.