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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”...

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 Relays for Motor Protection

Improve system reliability and efficiency BY KEVIN TRIMMER, Eaton Corporation Nearly a third of global energy demand is attributable to manufacturing. Overall, the industry’s use of energy has grown by 61 percent between 1971 and 2004. According to the International Energy Agency (IEA) analysis,...

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...

Maximizing Electric Motor Efficiency

How to get the most from your rotating machines BY STEPHEN MANSFIELD, TechnoWise Inc. An area of great interest is improving the efficiency of electrical devices. More electric motor efficiency means less electrical energy consumed and thus less impact to the environment. By far, the largest...

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...
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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 “more precise” control over the electric motor. Moreover, VFDs use sensitive communications data to control mechanical devices, allowing operators to increase precision, reduce waste, and increase motor life by reducing wear...

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Electrical Transformer Testing Handbook, Vol. 64

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Electric Motors Handbook Vol. 1

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CALCUATION OF TRANSMISISON LINE PARAMETERS WITH THE BOUNDARY ELEMENT METHOD