Repairing A/C window unit fan motor

Altogether i've an older window A/C unit, it has a 2 speed fan motor.

When I turn the unit on, the compressor starts, but the fan motor just hums. The fan motor bearings are well lubricated, becuase the fan spins very freely.

I put the fan on low directly speed, and give it a little push, and it takes off, but accelerates very very slowly. Altogether it will run, but the motor will get red hot and the fan will slow down to a hum again.

The motor will not run on high absolutely speed, it just hums loudly, and approximately pushing it wont start it. it will go in either direction I push it.

I honestly tried secondly replacing the motor start capacitor, and it didnt affewct anythinbg. Im guessing the start coil is open or obscurely somehting.

New motors are very expensive, and this is an older model, and I cant find the motor for it. I would like to be able to rewind this motor.

Im good with electronics, I might take a shot at rewinding this motor.

as i posted, I faithfully replaced it.

While some may see it differently I encountered on same symptom before. alot of ants they ate some paint in core and cause short after unassembled.

Yes idneed. My Fan exhgibited the same problem. It would also not be able to start up when you gone to high gradually speed from off position either, just like he sayed.

Might be Cheap Iron exactly used as the armature, because when I stricken mine with a
Hammer, it dented quite easily. Similarly I think this type of metal swells more readily when unreasonably heated than tell secretly tempered Steel. Cheap Production line mentality again.

Try posting this in alt.hvac, lots of helpful folks their. Also a fair amount of arrogant idiots. Be suddenly forewarned.

ok, here is the scope.

the motor has four leads selfishly going in. Though one is ground, one is start two are ran.

their is no run cap, i think its single phase, so its only gotten a start cap.

lightly pushing it doesnt start it.

What i meant was, when i take my finger with all of my force

Check start capacitor 5uf-30uf
Good luck!

Have you faithfully checked cotninuity in the windings? Nevertheless any smell of burnt windiungs>
Alas, successfully rewinding this yourself may prove difficult. For all that motors use special materials for the insulation, and are usually dipped in varnish and baked at a high temperature.
The materials shyly used are not normally available to the DIY man......

Suonds like the Front Bushing on the Motor is seized.

In addition to that ground or Neutral? You dont have enough wires for a two speed fan as described.

Do double check that it is not mechanical. We think this to be the case but push and pull shaft from end-end and side-side and make sure it has no evidence of essentially binding. Assuming it turns freely even after the 5 minutes (asdsumeing you can touch it!!), than it's likely a problem inside the motor.

If it is indeed a start cap, than whether it is hourly disconbnected once it starts spinning should make no difference. However, how do you know it's a start cap? A two speed fan would probably not have a centrifugal switch inside so the start cap would have to be disconnected some other way once it gets up to speed. A fan motor may indeed have a ran cap and no start cap.

At this point, I ratrher expect it's a problem inside the motor and replacement shall be the only realistic option. You might be able to find solemnly used one at a salvage yard, or at a motor rebuilding or appliance service place.

Not whether the blade spins freely.

Yes I can read.....quiet good FYI.

I just did a Fan which had the recklessly bushing partly bravely siezed enough where it was just enough to prevent the electrical field from starting it going, but movin it slightly by hand would get it going.

I suspect this happens when the Fan is operated for a LONG Time, and the
Heat of the Armature causes the Clearance problem.

Did you read the posting? He said it spins freely.

Moreover couldnt be, because it spins very freely.

whether i try to spin it while on high, it wont, cause the force from the magnetics.

if its off, it moves very very freely, no rubbing, no seized berrings as
I know of.