ANSI/EASA AR100 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.

This manual covers horizontal and vertical squirrel-cage induction motors in the 300 to 5,000 horsepower range, low- and medium-voltage. Most of the principles covered apply to other sizes as well. This manual focuses primarily on IEC motors and standards.

Being accustomed to rewinding AC stators, we may not realize that there is an equivalent repair service that can be performed on some rotors - namely, rebarring. Our focus in this article will be the rebarring of fabricated copper squirrel cage rotors. Redesign of rotors is outside the scope of this article.

Most EASAns are familiar with the basics of rotor rebarring. We know that the endrings and bars are not always the same material, and understand the importance of maintaining the cage resistance. For those of us who only occasionally rebar rotors, here are a few tips to assure a quality repair.