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Chuck Yung EASA Senior Technical Support Specialist
The standard was created by a group of like-minded industry professionals who recognized the need for a best practice guide specific to DC machines. The working group accomplished the creation of 2455 in fewer than three years, from project authorization request approval to final publication. This document was modeled after IEEE 1068, a widely used electric motor repair standard.
The working group participants were:
*Denotes EASA member
The working group covered everything from the receipt of the machine, to inspection and testing, to all aspects of repair including rewinding. Beginning with “Diagnostics in user’s plant,” the document recommends specific information gathering by the motor owner/end user to provide as much information as practical to the repair facility.
Incoming tests for the repair facility are described in detail, with many tests (e.g., voltage drop test) being very familiar to EASA service centers. Nearly a dozen figures will be familiar to EASA members because they were originally published in EASA documents.
The standard includes specific rewinding tips for fields and armature, as well as assembly and final test recommendations. IEEE 2455 also includes annexes for an Evaluation and Repair form, turn and undercut guidelines, an explanation of commutation, Commutator Condition Guide, sleeve bearing clearance, ventilation and cooling, post-assembly electrical adjustments and bearing currents in DC machines.
This 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.
This booklet covers topics such as:
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The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.
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Recommended Practice for the Repair of Rotating Electrical Apparatus This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.
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Revised May 2024 The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.
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