Low RPM induction motors are hard to find

[Electron Pump]

  Ive been searching for an induction motor and have ran into a bunch of brick walls. I have found some folks that can order new ones and eaven one place that had a good one in stock but it was $429 buckaroonies.

  One other question I've had that I haven't had any luck finding anybody who knows is what kind of machine uses these low rpm motors. Nobody has known except one guy said he thought that oil field guys sometime had to jerry-rig, excuse me Jerry, their pumps with them or something.

  If I knew some machines that used these motors I think I would be able to open up some more avenues of finding a more affordable option.

  By the way I'm looking for a 1.5 hp, 3 phase, 825 rpm, @ 120v. I think? The dealers said that they call all those low rpm motors 900's. So well you know.

  Most of the 1.5 hp motors are 220v. How important is it that I find a 120v.

[ghurd]

 3-Phase is 220V or more.

Surplus Center or ebay are the best bet.

G-

[Electron Pump]

  Good then, I'm only partially crazy. Got any idea what uses these motors?

[jonas302]

look to industrial type machines one that size might be an exhaust fan or something

make friends with a plant mechanic

As ghrud said most or going to be 230 or 460v rpm is 1750 3650  I might have misquoted those rpm but they are the 2 common ranges

I sure wouldn't pay 400 dollars for a 3 phase moter I just bought a 25 hp air compressor for 800 dollars A lot of 3 phase stuff is cheap because most people can't make use of it

[Electron Pump]

  Well thats right but, the dealer guys say that the lower the rpm the higher the cost of the motor.

[wpowokal]

Er what voltage is your DC system, this is relevant to your motor selection.

For a 24 or 48 volt system a 4 pole motor makes a good conversion, ie 1470 rpm (1500 less slip when operating as a motor).

I have some 8 pole motors nominal 750 rpm out of an alumina refinery, ex vent fans but have not decided if they will make good conversions for a 48v system, revolves around winding resistance/KW rating/rated RPM /wind speed available

allan down under etc

[Electron Pump]

  As far out as I can see right now, I'll be staying with a 12v system. Mainly because I can get the T105'S all day long for $35. And I happen to be a T105 fan, I think they are good batteries. I havent burnt any up yet but I can see far enough into the future that I will have a battery budget.

[Electron Pump]

  And the inverters. I will have to periodiacally replace(or upgrade) the inverter. Since I will probably stay so small scale, I think that I will stay with the cheap 12v inverters.