Sensorless, online motor diagnostics
- General Electric Co., Schenectady, NY (United States), Corporate Research and Development
- GE Multilin, Markham, Ontario (Canada)
Electric motors play a very important role in the safe and efficient running of any industrial plant. Early detection of abnormalities in the motors will help avoid expensive failures. Motor current signature analysis (MCSA) implemented in a computer-based motor monitor can contribute to such condition-based maintenance functions. Such a system may also detect an abnormality in the process as well as the motor. Extensive online monitoring of the motors can lead to greater plant availability, extended plant life, higher quality product, and smoother plant operation. With advances in digital technology over the last several years, adequate data processing capability is now available on cost-effective, microprocessor-based, protective-relay platforms to monitor motors for a variety of abnormalities in addition to the normal protection functions. Such multifunction monitors, first introduced by Multilin, are displacing the multiplicity of electromechanical devices commonly applied for many years. Following some background information on motor monitoring, this article features recent developments in providing tools for the diagnosis of faults or incipient faults in electric motor drives: Sensorless torque measurement, direct detection of turn-to-turn short circuits, detection of cracked or broken rotor bars, and detection of bearing deterioration.
- OSTI ID:
- 492161
- Journal Information:
- IEEE Computer Applications in Power, Vol. 10, Issue 2; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
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