Electrical Apparatus, September 2014

Electrical Apparatus, September 2014

This is a summary of the Electrical Apparatus September 2014 featured technical article,  by Richard L. Nailen, P.E.    Receive this article with your subscription to Electrical Apparatus

More than 20 years ago, growing international concern about the quality of manufactured products led to adoption of the ISO 9000 series of standards, which have since become widely accepted guidelines for quality management of both goods and services.

Quality has been defined as adherence to specifications. The manufacturing of a quality product must therefore involve three conditions. First, the specification must be suitable and complete. Second, the manufacturer must be evaluated for the necessary capability as well as for compliance with the specification. Finally, appropriate industry standards must be understood and observed.

These three requirements apply equally to the repair of electric motors. Quality repair, particularly rewinding, has become a concern with the emphasis on motor efficiency since the 1980’s. Studies in North America indicated that efficiency can be degraded by common repair practices.

Since then, standards of both the IEEE and the Electrical Apparatus Service Association (EASA) (in North America) and IEC 60034-23 (DIN EN 60034-23) in Europe have codified motor repair procedures. However, public and private agencies have sought to make sure these standards are being followed, as well as assuring that repair firms maintain the required capabilities.

In the United States, several approaches have been taken. Beginning in 1998, the Advanced Energy Laboratory in North Carolina began its Proven Efficiency program for auditing and certifying the capability of repair shops to maintain motor efficiency after rewinding. Before-and-after motor testing is used for verification.

Earlier, some shops had undertaken ISO 9000 registration. Based on these principles—but adapted to the particular concerns of motor repair work—the EASA-Q quality management program (also involving shop auditing) was introduced by EASA in 1993. Considered outdated by 2013, it was replaced the following year by a new EASA initiative: the Service Center Accreditation Program.

These and other programs, many initiated by individual motor users, all aim to augment the ISO 9000 system of consistency in procedures by adding specifics about the procedures themselves.

There are three keys to quality service: specifications, standards, and shop evaluation.

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