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Reviewing Electric Motor Reliability Research

What did the studies really say—then and now? BY HOWARD PENROSE, Ph.D., CMRP One of the most frequently quoted studies related to electric motor reliability is a 1983 Electric Power Research Institute (EPRI) project, entitled “Assessment of the Reliability of Motors in Utility Applications:...

Overload Protection for Electric Motors

Thermal images are an easy way to identify apparent temperature differences in industrial three-phase electrical circuits, compared to their normal operating conditions. By inspecting the thermal differences of all three phases side-by-side, technicians can quickly spot performance anomalies on...

Variable Frequency Drive Cable Best Practices

Correcting common mistakes that affect performance and safety BY PETER COX, Belden, Inc. Most industrial operations today are looking for ways to reduce costs in these tough economic times. Variable-frequency drives (VFDs) are popular in many applications because they provide energy savings and a...

Monitoring Stator Winding Deterioration

The importance of partial discharge testing in electric motors BY VICKI WARREN, Iris Power LLP Comparing partial discharge (PD) results obtained from a single machine is a valuable tool that enables companies to observe the gradual deterioration of a machine stator winding. Proper monitoring of...

Enhance Performance with VFD Technology

Energy savings for pumping applications BY TOM NEUBERGER & STEVEN WESTON, Eaton In the early days of variable frequency drive (VFD) technology, the typical application was in process control for manufacturing synthetic fiber, steel bars and aluminum foil. Because VFD improved process...

Bearing Protection of Inverter-duty Motors

Although it is now common knowledge that inverters—also known as variable frequency drives—often induce unwanted motor shaft voltages, many customers who purchase three-phase alternating current (AC) induction motors do not realize that models labeled “inverter-duty” or “inverter-ready”...
Home Motors & Drives

Motors & Drives

Understanding Short Circuit Motor Contribution

A back to basics approach

BY DARRELL BROUSSARD, GE Industrial Solutions

An electric motor’s contribution is the current generated by a motor or motors during a short circuit condition. It represents a small but important value that is needed to determine the maximum short circuit current available, thereby establishing the short circuit rating of electrical equipment.  Regardless of the size or voltage rating of a motor, it can be demonstrated that motor contribution is present...

Motors & Drives Articles

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Electricity Today T&D Magazine - Transformer Technologies Special Edition

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Optimizing Wireless Power Transfer