Motor Testing
Special Application Motors: Wound Motor Rotors
Many industrial applications require three-phase motors to operate at variable speeds...
- Noah Bethel
- PdMA Corporation
Forensic Analysis of Electric Machines
A tremendous amount of time, productivity and production can be lost using improper troubleshooting and evaluation techniques...
- Howard Penrose
- MotorDoc LLC
What Are Motor Greasing Best Practices?
In this interview, Clay discusses the steps involved in creating a structure and following the best practices for motor greasing...
- Clay Allen
- Mosaic
The Importance Behind The Addition of Annex D In IEEE Standard 43-2013
The standards working group behind the present edition of IEEE Std 43 made significant changes in the overall standard, including modifications to temperature normalization to 40°C. This was done to accommodate the many changes and observations in insulation chemistry and combinations over the past decades...
- Howard Penrose
- MotorDoc LLC
Rotor Evaluation Using MCEMAX®: In/Rush-Start/Up
The start-up of a motor is a stressful event. High current, rapid temperature rise and mechanical stress all create a perfect environment to evaluate the health of your rotor and expose any hidden anomalies...
- Noah Bethel
- PdMA Corporation
Rotor Evaluation Using MCEMAX®: Pole-Pass Frequency (Fp)
Rotor bars on the rotor of a squirrel cage induction motor act as a shorting mechanism to the magnetic flux emitted from the steel rotor laminations...
- Noah Bethel
- PdMA Corporation
Rotor Evaluation Using MCEMAX® – Fp Frequency
Pole-pass frequency (Fp) sideband evaluation is one of the more established methods of rotor evaluation utilizing the current signature analysis test...
- Noah Bethel
- PdMA Corporation
Rotor Evaluation Using MCEMAX® – The 5th Harmonic
Six independent methods of rotor evaluation can be used from the MCEMAX technology to analyze the condition of a squirrel cage AC induction motor...
- Noah Bethel
- PdMA Corporation
Large Electric Motor Reliability: What Did the Studies Really Say?
One of the most frequently quoted studies related to electric motor reliability is a 1983 Electric Power Research Institute (EPRI) project performed by General Electric...
- Howard Penrose
- MotorDoc LLC