Is there a standard for current unbalance in AC motors...
There are a lot of equipment types in industry that exhibit continuously varying speed. This presents a number of challenges to the vibration analyst. If a time sample is collected as the machine is continuously changing speed, the FFT will produce a virtually useless plot...
I’ve seen different variations of voltage testing on AC induction motors; however, the motor only really cares about the phase-to-phase voltage...
In this presentation will will discuss the vibration and ESA fault detection of rotor bar faults in three medium voltage compressor motors and how the combined use allowed the risk of catastrophic failure to be assessed...