7.5HP Compressor motor keeps tripping breaker

[bsaint]

Sorry i assumed it would be fairly close, as in within 50%, i understand all the impedance stuff but i didnt think it was THAT much, i just checked a brand new motor i have here its 208-230/480 3 phase, i connected the leads in 208/230 and the winding resistance was .75ish.
No idea if 3 phase would be different. Id assume not?
I stand corrected!
Also earlier the OP stated he had .4 ohms to ground from windings.

Its cool. One time I had a maintenance tech change out 2 motors (original and "bad" replacement) because he thought they were bad doing the continuity check across a winding.

OP, I dont think a shop will rewind 7.5hp if they still make an off the shelf version. Its probably not worth their time.