Two vs four pole Roto phase

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ptonsparky

ptonsparky

Tom
Location
NE (9.06 miles @5.9 Degrees from Winged Horses)
Occupation
EC - retired
Son-in-law bought some very used three phase equipment. He had a choice of two homemade roto phase set ups and choose the higher rpm.
It works fine, but is there any advantage of one vs the other?

I warned him to be on the lookout for a replacement 3 phase motor of the roto phase/ It's old.
 
ptonsparky said:
Son-in-law bought some very used three phase equipment. He had a choice of two homemade roto phase set ups and choose the higher rpm.
It works fine, but is there any advantage of one vs the other?

I warned him to be on the lookout for a replacement 3 phase motor of the roto phase/ It's old.
Click to expand...
The 3ph motor would be on the equipment, not the RPC. Or did you mean the RPC motor?
 
zbang said:
Come on, old isn't necessarily bad*, or is this one getting worn? Give it a good cleaning and oiling and see how it goes.
How big is this motor?

*although my back and shoulders have something to say about that
Click to expand...
No, just old. 15 HP. Bearings that do actually need greased on occasion. They are open.

Mouse damaged wires at one time.

Blew the crap out of it and of course it settled in around a bare spot just inside the motor housing that now has an EG. A few sparks and SIL was sure the free help wasn't worth the cost. Opened it up and found the rubber diaphragm that sealed the pecker head had obviously had an issue for sometime. Tracking & shrinkage in the area of bared conductor.
 
2 pole vs 4 pole only matters for the base speed of the pony motor in that they have to match. Most 2 pole single phase motors that size will be C face pump motors, which is only important with respect to the mounting arrangement. If it’s not a C face, quick availability of a replacement 15HP foot mount 2 pole motor might be an issue some day.
 
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