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AFCA Forums > Antique Fan Collectors Association > Post-1950 (Vintage) > Emerson 77648-TF Stator Resistance

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Emerson 77648-TF Stator Resistance  Rate Topic 
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 Posted: Fri Aug 3rd, 2018 06:05 pm
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Michael Stanko
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Rookie here. First fan project. Turned a dirty and scratched, yet perfectly running fan into a beautiful, non running fan. Hums but doesn't turn...even if spun by hand to start. Wiring looks correct...both duplicated original + also checked against a dwg I found on this forum and it's the same. That wiring diagram included resistance on across the A-B and A-C legs on the stator. I match the A-B, but A-C and well as B-C shows infinite resistance or and open circuit. Ut oh. Even snipped the old cloth covered wire back to within 1" if the entry into the stator windings just in case that old wire had cracked...darm...same readings. Then searched and searched with jewelers magnifiers on for damage to the coil wires...bend or a break or a discolor. Zip. I was very caution not to get close to the winding when I locked the rotor from turning to unscrew the fan.
Sounds like my stator is shot. :cry:

Any ideas on next steps?  :hammer:

Mike  

I hate to see this head to the trash can. I must say these things are built like a tank. 

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 Posted: Fri Aug 3rd, 2018 06:47 pm
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Lawrence Smith
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what fan model is it?  since it is the c leg that is open, try isolating it in the stator , you might get lucky & find the break. Someone might have a parts fan for you or rewind. Pics would assist.

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 Posted: Sat Aug 4th, 2018 07:11 am
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Levi Mevis
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It sounds like he has an Emerson of some sort by the way he described the way he removed the blades from the fan (having to lock the rotor into place to unscrew the blade from the fan). 
In the thread title he said its a Emerson 77648 TF which I'm not sure what the "TF" designation means as I've never seen that designation before on an 77xxx fan before. 

Last edited on Sat Aug 4th, 2018 07:14 am by Levi Mevis

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 Posted: Fri Aug 17th, 2018 11:51 pm
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Michael Stanko
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Label says 77648-TF   ....... Terrible Fan.  .....   Totally Fake  ? :D
Thanks for the replies. Any explanation of how to isolate or locate the short ot break in the C leg is appreciated. The 3 leads dive in under the varnished coil wires and leave me little hint of say where C is, and where it's not. I'm quite ignorant of motor winding, but I certainly see patterns here and am game to learn and look for the short.

Thanks,

Mike



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 Posted: Sat Aug 18th, 2018 12:11 am
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Michael Stanko
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Fyi, my fan "guts" look identical to the 77648-SQ in Bruce V.'s posts. 

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 Posted: Sat Aug 18th, 2018 05:39 am
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Andrew Block
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I have a good spare motor assembly from a TE, which is the non-OSHA brother of the TF, if you can't find the break.

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 Posted: Sun Aug 26th, 2018 03:36 pm
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Michael Stanko
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Hi Andrew...I definitely would like to buy that from you. Thanks very much for coming to my rescue! I spent a good 10 minutes with jewelers magnifiers and for the life of me I can't locate any wire break.

My fan is also missing both the oscillator link and the drive wheel that mounts under the gearbox. I always wondered why the fan freely swung on it's base and now I know why. Would you also have these parts for sale by chance?

Regards,

Mike




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