Please help me identify GE motor part number/spec

[amh]

Hi GJ members,
I got a motor from a friend for a compressor build and need to identify motor specifications. (He knew nothing about it, got it out of a junk pile)

The motor plate has been knocked off, so all I can tell is from opening the capacitor box is that it is a reversible 120/240V GE motor. The shaft is 1.25 inch diameter and it is reasonably heavy, guessing 184 frame based on 5.5inch front to back mounting bolt spacing.

I hope someone has one of these or has run into them in the past.

And for real motor GURUs, can one, reasonably, determine HP from no-load current? (No dynamometers here

Here are the pics to help me identify it:


Thx in advance.
ps. it was repainted green from what I think was beige at some point in its life

 

[Norcal]

My guess is 5 HP.

 

[amh]

Some updates on investigation:

Under no-load, in 120V configuration, this motor draws about 15 Amps, I expect the no-load 240V wiring configuration would draw about half that (i.e. 7.5A). Scouring the net, I saw someone measuring a "5HP LEROY SOMER motor" 240V no load at about 7A. That said, I also saw several web references that no load current is usually about 30% less than full load - not sure what to believe. Anyone done no-load current measurements?

Also, I used a crude android strobe app to get a feel for the RPM, it was around 1800. That makes sense, a typical 1750 nameplate 4-pole motor runs between 1800 and 1700rpm depending on the load (1800 being no-load).

Still cant find any GE single phase type 5KC specs for 3HP or 5HP, 4 pole motors. Neither TEFC, general purpose or any kind for that matter.

Anyone have a GE 3HP or 5HP single phase motor datasheet?

 

[amh]

OK, found a good article on no-load vs FLA motor current.
The short summary is that for a 4 pole motor, no-load current should be between 33% and 40% of full load current.

So if i multiply my measured 15A by 3, that would be ~45A@120V or ~22A@240V. From what I have seen, 5HP Baldor motors typically consume low 20s (21-23A).

Norcal's guess may turn out quite educated

PS
For anyone interested in the article I am referencing, here it is: www.easa.com/sites/files/accreditation_program/NoLoadCurrentBasics_0205.pdf