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AC DC mystery stump identification wanted  Rate Topic 
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 Posted: Sun Jan 6th, 2019 09:05 pm
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Steve Butler
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I picked this up today assuming I could identify it when I got there. No such luck. No ID tag or marks that tell me anything. It runs on ac and runs real fast on dc. Both speeds in the ac position only.  It doesn’t run in the dc position.  The blade was obviously added much later and is in great shape for being unprotected. I’m sure the big brains will know exactly what this stump is. Thanks in advance. 

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 Posted: Sun Jan 6th, 2019 09:06 pm
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Steve Butler
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🤷‍♂️

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 Posted: Sun Jan 6th, 2019 09:07 pm
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Steve Butler
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🤔

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 Posted: Sun Jan 6th, 2019 09:07 pm
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Steve Butler
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 Posted: Sun Jan 6th, 2019 09:08 pm
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Russ Huber
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R&M 3500 fan motor.

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3500f.jpg

Last edited on Sun Jan 6th, 2019 09:10 pm by Russ Huber

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 Posted: Sun Jan 6th, 2019 09:08 pm
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Steve Butler
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 Posted: Sun Jan 6th, 2019 09:11 pm
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Steve Butler
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Dang Russ, that was fast. I had originally thought R&M but didn’t see any trace of pinstripes and figured it was something else.  Thank you. The badge explains why there wasn’t any information on the motor. 👍

Last edited on Sun Jan 6th, 2019 09:17 pm by Steve Butler

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 Posted: Sun Jan 6th, 2019 09:16 pm
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Russ Huber
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https://archive.org/details/HartzellCharavayFans?q=hartzell

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 Posted: Sun Jan 6th, 2019 09:19 pm
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Russ Huber
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The R&M 3500 introduced in 20 has the cast in oil port cavities with felt. The identical list 3504 has oil cups.

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 Posted: Sun Jan 6th, 2019 09:19 pm
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Stan Adams
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I sold two of those with bad armatures at Duaway’s last spring. The DC setting had a piece of Nichrome to slow it down to the same speed as the AC position. Sounds like that nichrome is broken.

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 Posted: Sun Jan 6th, 2019 09:20 pm
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Steve Butler
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Cool link. I figured it came off a model plane, never imagined it was a legit fan blade. 👍

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 Posted: Sun Jan 6th, 2019 09:28 pm
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Russ Huber
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You can bypass the DC setting resistance wire wind simply with a HALF WAVE DIODE RECTIFIER in place of it.  The diode will slow the fan down for a second lower speed on AC wall current. 

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Last edited on Sun Jan 6th, 2019 09:28 pm by Russ Huber

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 Posted: Sun Jan 6th, 2019 09:31 pm
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Russ Huber
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Use the diode Specs. provided here.

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Last edited on Sun Jan 6th, 2019 09:32 pm by Russ Huber

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 Posted: Sun Jan 6th, 2019 09:33 pm
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Stan Adams
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That is cool Russ, haven’t tried that.

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 Posted: Sun Jan 6th, 2019 10:38 pm
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Russ Huber
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R&M list 3500

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 Posted: Sun Jan 6th, 2019 10:39 pm
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Russ Huber
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R&M list 3504.

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 Posted: Sun Jan 6th, 2019 10:45 pm
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Russ Huber
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Stan Adams wrote: That is cool Russ, haven’t tried that.
Works slick if you either want to drop RPM on a single speed, or gain a second lower speed on a single speed universal or DC brush motor fan.


One half wave diode in line on the power cord of a plug in 6" brush motor Polar Cub will drop motor speed by roughly 700 RPM.

Last edited on Sun Jan 6th, 2019 10:47 pm by Russ Huber

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 Posted: Sun Jan 6th, 2019 11:14 pm
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Tom Morel
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I heard that these universal motors ran better on DC. Is that true Russ?

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 Posted: Mon Jan 7th, 2019 12:16 am
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Russ Huber
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Tom Morel wrote: I heard that these universal motors ran better on DC. Is that true Russ?
I have heard this as well.  The facts are when we use full wave bridge rectifiers and half wave diodes we rectify AC wall current in generic form per say.  It is not a pure filtered DC voltage. 


It would be questionable about any dramatic differences claimed using either or voltage through a silly little fractional fan motor. But that is me.  :D

Last edited on Mon Jan 7th, 2019 12:16 am by Russ Huber

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 Posted: Mon Jan 7th, 2019 11:56 pm
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David Allen
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Steve Butler wrote: I picked this up today assuming I could identify it when I got there. No such luck. No ID tag or marks that tell me anything. It runs on ac and runs real fast on dc. Both speeds in the ac position only.  It doesn’t run in the dc position.  The blade was obviously added much later and is in great shape for being unprotected. I’m sure the big brains will know exactly what this stump is. Thanks in advance. 
It's delightfully dangerous looking! I love it!

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