View single post by Lane Shirey
 Posted: Fri Dec 3rd, 2021 09:59 am
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Lane Shirey

Joined: Wed Apr 30th, 2014
Location: York, Pennsylvania USA
If I recall from memory, the loop handle era GE fans have 5/16” rotor shafts. Someone please correct me if I’m not thinking right. 

I’d just buy an assortment that has 1/4”, 5/16” and 3/8. At some point you’ll need the others. For example if you get a GE BMY, you’ll need a larger washer.  

The rotor needs to be roughly centered in the stator, like Dave said.  Whichever end of the rotor goes in first, you’ll add maybe 3 washers to start, then test insert the rotor.  Use a flashlight and peek inside vent holes on the closed end of the motor housing to see how the rotor looks with regards to the open side.  Add or remove washers accordingly to get it centered.  When you’re happy with that, put some on the other end of the rotor, then test the motor end bell (cover) . You may need to install the mounting screws as that will fully seat the cover.  Check the in and out play. Pop off the cover and add or subtract accordingly.  You’re looking for 1/16”-1/8” max play.  When you think it’s right, tighten the cover and test that the rotor spins freely 

There are red and grey washers. They grey ones are half the thickness of the red. It seems I rarely need the grey ones. 

Keep in mind that the wind pressure will tend to push the rotor all the way to the back of the motor, so keep that in mind when comparing how far the rotor sticks out from the stator on each side. 

Just to clarify,  armatures and fields are found in DC and AC/DC brushed motor fans.  Induction motors like we’re talking about have rotors and stators.  No biggie, just for information sake.  

I hope that helps. 

Last edited on Fri Dec 3rd, 2021 10:02 am by Lane Shirey