Motor Health Monitoring at Standstill Through Impedance Analysis

Induction motors are the most common driving force for active mechanical components such as pumps and valves. When these motors are used in safety systems, which are normally on standby, monitoring the motors through nondestructive evaluation techniques is needed to guarantee their operability and s...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2016-07, Vol.63 (7), p.4422-4431
Main Authors: Sung Min Shin, Choi, Bo H., Hyun Gook Kang
Format: Article
Language:English
Subjects:
Analyzers
Estimates
Failure
Failure analysis
Frequency measurement
Impedance
Impedance analysis
Impedance measurement
Induction motors
Monitoring
Motor failure detection
Motors
Nondestructive evaluation
Nuclear power generation
Nuclear power plants
Online monitoring
Resonant frequency
Safety
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Summary:Induction motors are the most common driving force for active mechanical components such as pumps and valves. When these motors are used in safety systems, which are normally on standby, monitoring the motors through nondestructive evaluation techniques is needed to guarantee their operability and system integrity. In this context, this study suggests a method for motor health monitoring at standstill through impedance analysis. Impedance change tendencies for various motor failure cases are investigated. To identify the tendencies, first an equivalent circuit (EC) of an induction motor is developed, and probable impedance changes for each failure case are estimated based on the developed EC. Then, the estimates are experimentally verified by reproducing the failures and measuring the impedance with an impedance analyzer. As the equivalence between the estimates and the experimental results is confirmed, unique tendencies in impedance changes for each failure case are characterized. The suggested method is expected to be useful in areas with access restriction, such as nuclear power plants (NPPs), as motor impedance can be measured from a distance without any disruption on-site.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2016.2541089