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Consideration when deciding to repair NEMA Premium motors

Publication: 
Plant Engineering
Publication date: 
August 2013
Author: 
Tom Bishop, P.E., EASA Senior Technical Support Specialist

A perennial question in maintenance circles is whether it’s best to repair or replace an electric motor that fails. For most plant engineers and maintenance staff, experience attests to the reliability of standard efficiency motors that have been repaired or rewound using industry best practices. Repair also can cost far less than replacement, especially if the motor has special features.

But some decision makers opt to replace failed energy efficient motors (NEMA Premium models in particular) because they’ve “heard” these motors can’t be repaired without a loss of efficiency. So, what’s the right answer? It turns out that the decision to repair, rewind or replace a failed energy efficient motor is not always so simple and straightforward as you may have heard.