A new edition of the only American National Standard for electric motor and generator repair was published in late 2010 by the Electrical Apparatus Service Association (EASA). ANSI/EASA AR100-2010: Recommended Practice for the Repair of Rotating Electrical Apparatus (AR100) specifies and details good practices for repair, rewinding, and testing that enable apparatus rebuilders to maintain or improve the energy efficiency and reliability of AC and DC motors and generators. This article discusses the mechanical aspects of motor repair that AR100 prescribes, as well as their importance for endusers. Topics include cleaning, lubrication, bearings, and repair of frames, shafts, and bearing fits.
For endusers, one value of AR100 (Figure 1) is that in just 22 pages, it concisely describes “good repair practices.” It also provides six pages of supplemental information. Further, endusers who require service centers to comply with the recommended practices in AR100 can be ensured that repairs will be made in accordance with a recognized American National Standard. The expected result will be a “good practice repair” — i.e., a quality repair without shortcuts.