3 phase resistance calculation

[bill1983]

hi viking sad to see you have nothing better to do on a friday night
i know how to check the resistances, BUT if the comp has overheated to the extent that it has tripped how would i know what the original readings should be without the technical details.
call me anal if you like but i asked 4 good engineers the same question and noboddy knew the formula.
if nothing else it's useful to know

[nike123]

call me anal if you like but i asked 4 good engineers the same question and noboddy knew the formula.
if nothing else it's useful to know

There is no such a formula. To many different factors are in game to make any meaningful formula. You need to find technical details of compressor. All manufacturers have such data for their compressors. If it is Copeland, Dorin, Bitzer, Tecumseh, Maneurop, I could try to find that resistance for you if you provide model no.

[Billy Ray]

Hello Bill,

no idea to answer your question.

We need a 'motor rewind mans' opinion.

Although, i've tested many a compressor in the small hours of the morning & they all have similar resistances (generally only a few ohms a winding). Thats small compressors (under 10 H.P.) & big 'uns' up to 100 H.P. (i'm only a comercial boy).

Billy Ray