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GRAYBAR fan motor help  Rate Topic 
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 Posted: Thu May 18th, 2017 12:44 pm
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Jim Tonelli
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Hello.    This is my first post.  I have a 1931 Graybar Fan Model # 27X840G   Long story short, bought on Ebay, seller said it ran and started on its own.  Arrived with a cut off cord and wires broken off switch inside.  I replaced the cord.   I just get a hum.   No turning at all.  Even with a push to help it start.   I would like to go back in and clean the motor.   What is recommended to clean?   Dry brush?  Or something a like carburetor cleaner?    There are two very thin gauge wires with a braided material jacket going to the motor.   I don’t see a capacitor.   Could there not be one on this model?  I have a meter, and am usually very good with troubleshooting, but I have had no experience with motors. Any help would be appreciated!   Thank you.





 



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 Posted: Thu May 18th, 2017 06:09 pm
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Jim Tonelli
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attached are a few pics of the internals.   still don't see a capacitor or secondary windings to start the motor, am I missing something?







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 Posted: Thu May 18th, 2017 06:29 pm
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William Dunlap
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It's a shaded pole motor design. Probably the most common fan motor.
You'll see a copper band around a segment of the laminates.
That's all that's required to get it going in the right direction.
I wonder if Tesla was first with that idea?Test for continuity of your coils first. Then look for binding of the rotor.
Cheers,
Bill

Last edited on Thu May 18th, 2017 06:31 pm by William Dunlap

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 Posted: Thu May 18th, 2017 06:43 pm
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Jim Tonelli
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Thanks Bill. (& Nikola)

Is there a certain resistance I should be testing for on the two leads?

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 Posted: Thu May 18th, 2017 08:04 pm
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William Dunlap
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I just perused the info section which you will have access to once you are a member and didn't see any wiring diagram for that particular fan.
However, I would expect to see some ohm reading, maybe 25 -50 ohms, just a wild guess, but I wouldn't expect to see a very small number which would indicate shorted windings.

Cheers,
Bill

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