The big issue I have is with the rewind shops. I know from personal experience that some rewind shops are lame.
I demand at least a one year warranty, test results of QA, and if it fails...I better have a rep kissing my butt and telling me why it failed and explaining what to do to fix it.
Rewinding is very cut-throat, so if they don't mind losing your business...fine. There are several that want your business even if they have to drive a little.
Anyway, the location of the failure is a prime indication of the possible cause(s). And core damage (depending on severity) will lead to replacement of the rotor or at worst the entire motor.
The motor savers and that genre are important for single phasing and some types of voltage anaomolies, but I'm more concerened about transients, type of lead wire used and the environment.
I would also check with the TCI www.transcoil.com
they make line reactors and filters.
Hope this helps some.
[This message has been edited by ctolbert (edited 08-15-2001).]