Motor Testing
PI Testing “The Fire Hose Analogy”
A Polarization Index is affected by multiple current components that occur simultaneously. This instructional presentation provides a simple analogy to make this complex test easier to understand...
- Don Donofrio
- The Snell Group
Electric Motor Reliability Trifecta – Training Cont’d
Keeping the focus on Trending, in Trending Part 1 we discussed qualitative trending and focused on the change in appearance. This week we switch from qualitative to quantitative trending...
- Noah Bethel
- PdMA Corporation
Stator Mechanical Faults Using Electrical Signature Analysis (ESA)
A stator mechanical fault is created when the stator core becomes loose within the motor frame, or if the windings are loose between the stator slots. A loose stator core or winding over a period of time will cause...
- Mark Koch
- ALL-TEST Pro, LLC
Increased Revenue Results from Expanded Testing Capabilities
Growing companies typically make investments in state-of-the-art tools and equipment so that they may expand their capability to serve their customers. One such company, Koontz-Wagner Services, has been able to capitalize upon several opportunities since acquiring new energized and de-energized motor testing equipment last year...
- Mark Koch
- ALL-TEST Pro, LLC
Electric Motor Reliability Trifecta – Trending
For this tip we focus on qualitative trending of data. Remember trend is your friend and by qualitative trending we are talking about a change in the appearance of the data rather than an amplitude value change.....
- Noah Bethel
- PdMA Corporation
Calculating Eccentricity Frequencies
Eccentricity Frequencies, as related to electric motors, simply means that the rotor is not radially or axially centered in the stator magnetic field. This instructional video demonstrates how to calculate these frequencies..
- Don Donofrio
- The Snell Group
The Trifecta of Motor Maintenance
Using the same concept of a trifecta (three factors for success), this article provides companies with the winning strategies of motor maintenance, focusing on the three reliability tasks for electric motor testing and the order in which they should be applied.
- Noah Bethel
- PdMA Corporation
Polarization Index Profiles
A polarization index is a 10-minute timed insulation test using a megohmmeter to measure resistance to ground. If you plot or graph the results incrementally, it will give you a profile of the resistance to ground. There are five distinct patterns that we'll get...
- Don Donofrio
- The Snell Group
Calculating Field Pole Pass Frequency
Field Pole Pass Frequency Sidebands (Fpp) are a primary method of identifying rotor anomalies. This instructional video demonstrates how to calculate these frequencies....
- Don Donofrio
- The Snell Group