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The motor is the soul of your equipment. In order to make sure it keeps running, you need to have a complete understanding of all the ways it could fail. By performing motor circuit analysis as part of your predictive maintenance program, you can diagnose the health of your motor and prevent failures. When you analyze the main six fault zones: power circuit, power quality, rotor, stator, insulation and air gap; you get a complete overview of your equipment's condition.
Here we share information about those fault zones, why both dynamic and static testing are important, and which tools you should use to perform the analysis.
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| Using a Six Fault Zone Approach for Predictive Maintenance on Motors |
| David L. McKinnon | PdMA Corporation |
A comprehensive analysis of motor health may be accomplished by combining online and offline test results into fault zones. These fault zones are Power Quality, Power Circuit, Stator, Insulation, Rotor, and Air Gap. Power Quality focuses on the quality of the voltage and current. Power Circuit focuses on the power circuit supplying power to the
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| A Closer Look at Air Gap Eccentricity |
| Douglas E. Swinskey & Peter M. Bechard | Reliabilityweb.com |
The Air Gap Fault Zone describes the measurable distance between the rotor and stator within the motor. Air gap eccentricity is a condition that occurs when a non-uniformity in the air gap between the rotor and stator exists.
During operation, several stresses are brought to bear upon key components of the motor. Continue reading.
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| Identifying Motor Defects Using the Rotor Fault Zone |
| David L. McKinnon | PdMA Corporation |
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The Rotor Fault Zone refers to the condition of the rotor
bars, rotor laminations, and end rings. Although only a
small percentage of the motor problems, rotor faults can
influence other fault zones to fail. Tests used to analyze
the rotor fault zone include the In-Rush Current, Current
Demodulation, CSA, RIC, and Inductive Imbalance.
Read more [pdf]. |
| Helping Motors Keep their Cool |
| Chris Medinger | Reliable Plant |
An electric motor's insulation system separates electrical components from each other, preventing short circuits and, thus, winding burnout and failure. Insulation's major enemy is heat, so it's important to be sure to keep the motor within temperature limits. There is a rule of thumb that says a 10-degree Celsius (18-degree Fahrenheit) rise reduces the insulation's useful life by half, while a 10° C (18° F) decrease doubles the insulation's life. Read more. |
| Combining Static and Dynamic Testing - Preventing a Motor Catastrophe |
| Noah Bethel | PdMA Corporation |
[...] Predictive maintenance discovered a nomalies in the rotor, problems that preventive maintenance is not designed to discover. An advanced technology at this level of maintenance made the difference. In most cases motor testing is either static with a de-energized motor or dynamic with a motor that is running during testing. However, this technology, with its ability to combine static and dynamic testing, a process unavailable in other motor testing equipment, was able to isolate the rotor issues. In essence, the defective rotors were discovered and confirmed through the unusual combination of motor circuit analysis and power analysis. Read more [pdf].
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How to Achieve an Effective Maintenance Strategy
To ensure an effective maintenance strategy, it must be designed using engineering methodologies to eliminate or minimize the probability and consequences of failure in our operation. Read more.
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NEXT TRAININGS
Learn the most effective practices to efficiently use labor; manage parts, tools, reduce time spent waiting for jobs to be assigned; and streamline complex shutdowns. For more details and registration, click here.
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October 31
During this edition, the main topic will be ISO 55000, the first international standard for asset management. Register now and pay just $400/person. More details here. |
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November 12-14
This course provides foundational training in industrial lubricants, machinery lubrication and oil sampling. It lays the groundwork for establishing a lubrication and oil analysis program. Click here for more information. |
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