Comparison of Motor Current Analysis & Vibration Analysis In Detecting Rotor Bar & Air Gap Eccentricity Problems In Induction Motors (42 page booklet)
• This paper focuses on how to perform motor current spectral analysis using a current transformer (CT) as the transducer, while using the same data collectors or real-time analyzers which have been used in the vibration program.
• It will show how the spectrum of motor current amplitude (amps) versus frequency (Hz or CPM) can successfully be analyzed to detect problems in the stator, rotor and dynamic/static eccentricity within an induction motor.
• It also compares the methods used to detect problems by vibration analysis versus those detected by motor current spectral analysis.
• Likewise, it provides a "Motor Current Severity and Recommended Corrective Actions Chart" which has been developed by Technical Associates after performing motor current analysis for a number of years on a large number of induction motors.
• This paper will also include real-world case histories using both vibration and motor current analysis, as well as applying the aforementioned "Motor Current Severity Chart".