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Articles: Motor and Power System Testing

On-Line Electrical Motor Testing 101

Electrical Signature Analysis (ESA) is an on-line test method where voltage and current waveforms are captured while the motor system is running and then, via a Fast Fourier Transform (FFT), a spectral analysis is done by the provided software.

PdM of Mechanical Failures Using Electrical Measurements for Instantaneous Torque

by Ernesto J. Wiedenburg

Electric dynamic predictive maintenance is a field of continual rapid technology development. The same theoretical background, which made the first torque controlled VFDs possible, is now utilized to monitor the shaft torque by measuring only the stator currents and voltages. The first diagnostic use of the instantaneous torque signal as part of an off-the-shelf solution for field maintenance reached the market in 1999. In the last ten years, it has shown a dramatic increase in the quality of the information obtained over previously used techniques.

 

Power Quality Surges in Importance - PQ is a Major Factor as Facilities Go Green

by Ross Ignall

The demand for productivity improvements in the 24/7 global economy, rising energy costs, and increasingly stringent Federal energy conservation initiatives impacting all areas of business and industry are only a few of the reasons why power quality considerations are seeing a renewed surge (no pun intended) of interest among operators of industrial, commercial and institutional facilities. The simple fact is that variable-speed drives, high-efficiency lighting ballasts, and other "green" improvements are themselves the frequent cause of serious power quality issues that can dramatically impact facility operations in terms of equipment service life, bottom-line profitability, and even safety. This article briefly overviews the fundamental power quality concerns facing today's industrial facility, with an eye to providing a few pointers that facility professionals can use to safeguard their operations while optimizing operational efficiency.

Proper Electrical Safety Testing Takes Shock Out of Workplace

by The Seaward Group

The safety of everyday electrical devices is widely taken for granted. All too often though, the lax approach to proper electrical safety testing can result in tragedy. For example, back in 2005 a woman suffered a fatal electrical shock in a restaurant washroom in England after using the hand dryer. It was subsequently determined that the dryer was faulty, a preventable situation that should have been detected by the eatery's employees.

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Take the Big Picture Approach

Managing the Complete Motor System

Modern management practices often do not take into account the importance of motor systems maintenance and management requirements. Through efforts in cost control, many industrial and commercial firms reduce maintenance staffs, take least cost approaches to corrective actions and sacrifice preventive maintenance programs. The result has been increased energy costs and downtime resulting from equipment not operating to full potential and failing unexpectedly. The problem results in $100's of billions of dollars in additional energy consumption and lost revenue. Unfortunately, in many cases, the connection between the cause and effect is not made.

The Quest For Maintaining Efficiency in Motor Repair

The Best Defense Is a Good Offense

by Kitt Butler

In the June/July issue of Uptime magazine, we introduced, “Guidelines to a Good Motor Repair” – a document designed to help facilitate communications between a motor repair vendor and the customer.  This article will explain why motor repair is important and what the marketplace is doing to ensure quality in the process. 

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