Don Donofrio
Five Minute Facts
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
Five Minute Facts
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
Webinars
Energized Electric Motor Test Capabilities
Gain a thorough understanding of the capabilities of energized electric motor testing. Learn expedient testing methods for identifying power quality problems, motor and motor circuit electrical issues, motor, drive train mechanical issues and most failure mechanisms that lead to motor insulation breakdown…
- Don Donofrio
- The Snell Group
10 Minute Talk
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
Five Minute Facts
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
Five Minute Facts
Isolating Motor Faults Using Resistance and Inductance
Resistance and inductance are crucial measurements for assessing electric motor condition. This instructional presentation covers how to determine rotor or stator faults using just these two parameters....
- Don Donofrio
- The Snell Group
Two Minute Tips
Determining the Number of Poles and RPM
Give me the number of poles and I can tell you the RPM; give me the RPM and I can tell you the number of poles. This instructional presentation discusses the formulas related to determining theses values...
- Don Donofrio
- The Snell Group
Interviews
The Keys to Developing an Effective EMT
Personal preparation is one of the most important factors in starting a motor testing program. It probably takes me 20 to 30 minutes in the evening to set up my equipment and get it ready to go. I make sure everything is charged up...
- Don Donofrio
- The Snell Group
Interviews
Rotor Anomalies
In this interview, Don will share how to identify and confirm motor anomalies with electric motor testing. Listen to Don as he shares is background knowledge in Motor Testing…
- Don Donofrio
- The Snell Group
