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1947 Vortalex motor hum  Rate Topic 
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 Posted: Sat Jan 5th, 2019 04:09 pm
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David Kilnapp
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Hello fellow collectors. I recently finished this nice '40's Vortalex. The oscillation is wonderfully slow and steady and it works perfectly on all three speeds. My only complaint is that there is a distinct motor hum that is very noticeable at the middle and lowest speeds. It seems to be originating from the rotor and stator. Is there anything I can do to mitigate this noise? Any suggestions appreciated.


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 Posted: Sat Jan 5th, 2019 04:42 pm
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David Allen
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Hi David. I have a similar Vorty which had a winding buzz caused by loose coils. I revarnished it and the buzz went away. I did a video on it as well.

Take a listen and see if this is the sound yours has: https://www.youtube.com/watch?v=sfqY_-ySid8 

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 Posted: Sat Jan 5th, 2019 04:48 pm
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David Kilnapp
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That's EXACTLY the noise I'm talking about Dave, in your video. I used some marine varnish that will require a good 24 hours of drying time. I'll let you know tomorrow how this worked out Dave. Thank you for your advice!

Last edited on Sat Jan 5th, 2019 05:03 pm by David Kilnapp

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 Posted: Sat Jan 5th, 2019 04:59 pm
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David Allen
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David Kilnapp wrote: That's EXACTLY the noise I'm talking about Dave, in your video. What did you use for varnish?
Cool. For that motor, I wanted to bond and seal everything together. It's not a modern, high-temp winding system. That opens up a lot of options such as Triple-Thick glazing varnish.

This is it, but you don't have to buy a case at a time. https://www.homedepot.com/p/Rust-Oleum-Specialty-12-oz-Gloss-Clear-Triple-Thick-Glaze-Spray-6-Pack-264985/203837599 

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 Posted: Sat Jan 5th, 2019 06:05 pm
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David Allen
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Here is another video about this: https://www.youtube.com/watch?v=z_WKRQjxhUg 

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 Posted: Sat Jan 5th, 2019 06:24 pm
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David Kilnapp
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Thanks Dave. Watched the whole video. Very interesting and instructive.

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 Posted: Sat Jan 5th, 2019 06:25 pm
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David Allen
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Glad you found it helpful! Stopping the vibration of the windings will preserve the life of the motor.

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 Posted: Sat Jan 5th, 2019 10:41 pm
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David Kilnapp
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I just reassembled the fan and VOILA, NO HUM!! That's a slick trick Dave. I'm much obliged to you. It's a good day when I learn something new!

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 Posted: Sat Jan 5th, 2019 10:42 pm
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David Allen
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David Kilnapp wrote: I just reassembled the fan and VOILA, NO HUM!! That's a slick trick Dave. I'm much obliged to you. It's a good day when I learn something new!
Wonderful! Very happy to have helped!

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 Posted: Sat Jan 5th, 2019 10:51 pm
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David Kilnapp
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I love this forum. Wonderful people and wonderful hobby!

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 Posted: Mon Jan 7th, 2019 12:49 am
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Levi Mevis
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Mr. Kilknapp your Vortalex is actually from 1950, its a 3rd Generation Vortalex, I have a Vortalex just like it except mine is a 12" version, and your Cousin George repaired the cage for my Vortalex for me because it had come unwelded in a couple of spots.
The type of varnish you should of used on your stator was Insulating varnish not Marine Varnish.

See Picture below for an example of some Insulating varnish you can get to use on fan stators to reinsulated them.

 

Last edited on Mon Jan 7th, 2019 12:50 am by Levi Mevis

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 Posted: Mon Jan 7th, 2019 10:55 am
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David Kilnapp
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Thank you ever so much Levi (and please call me Dave). I will order some of this varnish. I appreciate your helpful suggestion and I wish you a wonderful day! By the way, my Vortalex is indeed a 12 inch Vorty. Thank you for the correct information on it. It's the second quietest fan that I have worked on and the oscillation is definitely the slowest that I have seen. It's a wonderful bedroom fan which is almost silent (now that the hum is gone) at the lowest speed. The only fan that is quieter is the 1905 Pancake that I purchased from Ted Kaczor.

Last edited on Mon Jan 7th, 2019 11:52 am by David Kilnapp

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 Posted: Tue Jan 8th, 2019 02:48 am
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Randy Pierce
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If you do take on an untape and retape of original windings be ever so careful not to unseat the winds as much as possible.  It has worked for me after a disastrous learning curve to disturb as little as possible.  I have untaped and soaked the windings in minwax polyurethane, let it dry and then retaped and back in the stator housing with dead silent results.  Not saying this is the best way possible, but it has worked great

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 Posted: Tue Jan 8th, 2019 07:48 am
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David Allen
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Randy Pierce wrote: If you do take on an untape and retape of original windings be ever so careful not to unseat the winds as much as possible.  It has worked for me after a disastrous learning curve to disturb as little as possible.  I have untaped and soaked the windings in minwax polyurethane, let it dry and then retaped and back in the stator housing with dead silent results.  Not saying this is the best way possible, but it has worked great


Hi Randy. Yes this is very important!  After the windings have "cured" over the years, the original emanel coating on the wires has become brittle and will flake off very easily. If two flaked-off areas touch, the winding will fail. So it's very important not to flex or disturb an old winding.

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 Posted: Tue Jan 8th, 2019 02:23 pm
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Randy Pierce
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David, I have learned a lot from you, so thanks!  I will likely never go further than simple shaded pole windings, and  am about to take on rewinds of a small polar cub and a baby GE, both 2 pole motors.  Let's see how it goes. 
Thanks David, Randy

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 Posted: Tue Jan 8th, 2019 02:34 pm
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David Allen
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Randy Pierce wrote: David, I have learned a lot from you, so thanks!  I will likely never go further than simple shaded pole windings, and  am about to take on rewinds of a small polar cub and a baby GE, both 2 pole motors.  Let's see how it goes. 

Thanks David, Randy


Very glad to help!  I'm sure it will be very rewarding when you get it going!

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