odd ball motor

The oddest part is the 1150 RPM, but isn't the fan belt-driven? If so, re-pulley to use a normal motor.

Or drive the fan a little (50%) faster with a 1750 motor without re-pulleying.

Or use a 3-phase & VFD. 1/4 hp VFD would be really cheap.

Bob

|vw_ACMotors&phase=1&rpm=901-1200&hp=0.25 Baldor L1204?

i

The easy thing to do is sacrifice about 0.8 percent RPM and go with an

1140 RPM motor of which there are many available.

If it's absolutely gotta be 1150, take a look at the Emerson Rescue

5471, which is a one-size fits all for motors from 1/5 to 3/4 hp and range of RPMs--one possibility it allows with appropriate choice of capacitor is 1/4 hp at 1150 RPM. You'll also need to get a base kit for it to base-mount it.

Thanks for the link. One of these will work for sure. On first pass, I didn't see anything showing the difference between the different sub classes of 48 frame motors. is it there and I missed it?

Karl

Some of them differ by enclosure (TEFC, TEAO, drip proof). Some by shaft diameter (those ones ending with Z).

i

Thanks for the link, but $264 plus shipping? Whoa, I don't want gold plating, I just want to turn the fan.

Maybe i should look for dayton or GE

karl

I belive that AC motor speed is a function of how it is wound and the frequency. So I suspect that a 1140 rpm motor and a 1150 rpm motor are probably wound the same and will spin the same speed all other things being equal.

It might be a difference of how each manufacturer rates their product ie. measuring the speed or theoretical speed.

Roger Shoaf

Right - it is 3600 (line cycles per minute) divided be the number of poles. So - 3600, 1800, 1200, 900, etc. Minus the slip.

Bob

Good luck. I noticed that 6-pole motors (variously called 1140, 1150 and 1200 RPM) seem to be considerably more expensive than the much more common 4-pole motors of comparable size and construction. Grainger has a bunch of condenser fan motors but they all cost more than the Baldor and I think most of them had 5/8" shafts. The Baldor might also, didn't see a shaft size in the description.

You can have any combination of two out of three:

- Exactly the motor you need

- Quickly

- Cheaply

But you cannot have all three. Nevertheless you can probably find something on ebay or use a more messy solution like a VFD.

i

Truer words were never spoken.

Karl

My Dad used to have a sign over his desk at work

GOOD FAST CHEAP (choose any two)

Being the cheap SOB that you know I am, i found a motor with the wrong frame and shaft for $110. Only took me two extra hours to modify. Better than waiting three more days and paying $265 plus shipping.

Karl

The particular "Emerson Rescue" brand motor is a universal replacement and can be set to run at 1100, 1135, 1140, and 1150 RPM and several other speeds for particular applications. How they do it I have no idea.