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 Posted: Wed Mar 7th, 2018 02:48 am
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Levi Mevis
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Hello everyone I had last year at Mike Mirin's Place at his Fandango meet acquired a 1940s vintage Fresh'nd Aire Floor Circulator that when I first got it it worked fine and I used it on a regular basis in my old office to help circulate air and then one day when I went to turn it on I was wanting to put it on low the fan was running at its normal low speed but then suddenly started slowing way down and when it did that it was making a high pitched whining noise that continued even after the fan had slowed down to its "slower than normal low speed" speed. 
And it only does this on low, Medium and High run just fine, any ideas as to what could be causing this issue? I have oiled the heck out of this fan and it didn't seem to make a difference, the fan has a Redmond motor in it if that helps any in helping to figure out whats going on with my fan. The fan is in pretty decent shape yet no cracks to the bakelite, although it seems to be missing the rear cover to go over the motor on the back of the fan and its also missing the bottom masonite cover as well, which I'm not sure how common that is and I'm sure that has nothing to do with the fan's aforementioned issue but I just wanted to mention that.

picture of the fan in question posted below.




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 Posted: Sat Mar 10th, 2018 11:25 pm
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Kevin Massey
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The speed coil might be the problem. I have several chrome fresh'nd aire fans and all speeds run through the speed coil.  You also might have a dirty bearing.  I've run into that recently with and Emerson fan.  I oiled the wicking but it wasn't making it to the bearing surface. 

Last edited on Sat Mar 10th, 2018 11:26 pm by Kevin Massey

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 Posted: Sat Mar 10th, 2018 11:29 pm
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Levi Mevis
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Ok, I'll give that a try.

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 Posted: Sat Mar 10th, 2018 11:49 pm
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David Allen
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Levi; a high-pitched whining would make me worry that a bearing is dry. How is the spin-down time?

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 Posted: Sat Mar 10th, 2018 11:54 pm
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Levi Mevis
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Well David, the weird thing is that I oiled the heck out of that sucker and it's still giving me trouble, and it's sundown time is about 25 seconds last I checked.

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 Posted: Sat Mar 10th, 2018 11:56 pm
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Levi Mevis
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*Spindown time.

Sorry dumb auto correct on the phone made it say sundown.

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 Posted: Sun Mar 11th, 2018 12:00 am
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David Allen
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Levi Mevis wrote: *Spindown time.



Sorry dumb auto correct on the phone made it say sundown.



LOL at autocorrect. It has made me insert my foot into my mouth several times!

Can you make a video of the whining sound? 

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 Posted: Sun Mar 11th, 2018 12:08 am
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Levi Mevis
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I sure can, like I said it only does it on low, and when it happens the fan's speed goes down with it almost to the point of being too slow to run but it does and when it finally slows down to the speed it wants to slow down to it the whine becomes steady and even more high pitched whereas when the fan's speed is going down the high pitched whine comes and goes as the fan speed steps down to the next speed down that it goes to. It's really weird.

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 Posted: Mon Mar 12th, 2018 02:41 am
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Levi Mevis
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OK David here's some videos of what the fan is doing, its actually one video but its in two parts because there was a delayed reaction for the continuous high pitched whining sound to kick in, because previously it kicked in right away as soon as the fan quit the first high pitched whining noise accompanied by the gradual slow down of the motor on low, so I had to make a seperate video of the continuous whining noise it made.
the videos are posted below.






 Don't worry, you'll notice the whining noises I'm talking about in the videos the noises stick out like a sore thumb, and they can actually be heard over the fan itself.

Last edited on Mon Mar 12th, 2018 02:44 am by Levi Mevis

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 Posted: Mon Mar 12th, 2018 02:53 am
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David Allen
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Levi Mevis wrote: OK David here's some videos of what the fan is doing, its actually one video but its in two parts because there was a delayed reaction for the continuous high pitched whining sound to kick in, because previously it kicked in right away as soon as the fan quit the first high pitched whining noise accompanied by the gradual slow down of the motor on low, so I had to make a seperate video of the continuous whining noise it made.
the videos are posted below.




 Don't worry, you'll notice the whining noises I'm talking about in the videos the noises stick out like a sore thumb, and they can actually be heard over the fan itself.

Man; that is an unusual noise!

It sounds to me, like the harmonic resonance you hear as the fan motor starts up - only instead of increasing in pitch and decreasing in volume as the motor picks up speed, it's just stuck in the harmonic range.

I have a feeling that the sound is a symptom of the motor running at a speed which is "just wrong" for it. Probably once the speed coil or whatever else is causing the slow running is fixed, that sound will be remedied.

Have you checked the current draw to see what it is pulling on each speed?

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 Posted: Mon Mar 12th, 2018 02:56 am
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Levi Mevis
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No I haven't checked the amp pull on the motor yet, but like I said it only does that on the low setting medium and High setting doesn't do that, but I shall check the amp pull on all three speeds and see whats going on with it.

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 Posted: Wed Mar 14th, 2018 03:49 am
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Jeff Jones
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That's definitely harmonics...not a bearing screech. I'm thinking either a speed coil issue or an issue with the low speed winding if its multi-winding. Its definitely a harmonic due to the speed it's spinning at. A few RPMs either way and the sound disappears. If you go from low to medium then back does it settle back down to that whining speed right away again or is it gradual?

Do you have a variac? If so try running it w/ the switch on high and cutting the speed down to "normal" low w/ the variac. See if it maintains it. If so that further rules out a mechanical issue and further points to it being electrical.

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 Posted: Wed Mar 14th, 2018 08:26 am
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Levi Mevis
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OK so I checked the fan's current draw and on high the current draw was 1.0 amphere exactly spot on just like the motor tag said it should be, on medium the current draw was around 0.87 ampheres and on low the fan was drawing 1.0 amphere which I take it means its malfunctioning for sure because on low the fan should probably be drawing closer to .75 ampheres when in proper working order, and not 1.0 amphere. So it must be something with either the motor windings or the speed coil, which on this fan the speed coil looks like a medium sized power transformer or an audio transformer for a tube radio. This fan by the way uses a Redmond Type L motor in it, if that helps any with figuring out the issues with this fan, also the "headwire" for this fan is of the two conductor type.

Last edited on Wed Mar 14th, 2018 08:28 am by Levi Mevis

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 Posted: Wed Mar 14th, 2018 12:55 pm
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David Allen
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Levi Mevis wrote: OK so I checked the fan's current draw and on high the current draw was 1.0 amphere exactly spot on just like the motor tag said it should be, on medium the current draw was around 0.87 ampheres and on low the fan was drawing 1.0 amphere which I take it means its malfunctioning for sure because on low the fan should probably be drawing closer to .75 ampheres when in proper working order, and not 1.0 amphere. So it must be something with either the motor windings or the speed coil, which on this fan the speed coil looks like a medium sized power transformer or an audio transformer for a tube radio. This fan by the way uses a Redmond Type L motor in it, if that helps any with figuring out the issues with this fan, also the "headwire" for this fan is of the two conductor type.

Hi Levi. Sounds like you've located an electrical problem in the speed coil. Since the motor has only one winding, which works on all 3 speeds - and the motor works correctly on High and Medium - you can most likely rule that out.

One unlikely but plausible cause would be a short between any two of the speed wires from the switch to the speed coil. Be sure the switch isn't bridging together Low and Medium or something along those lines.


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 Posted: Wed Mar 14th, 2018 10:46 pm
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Levi Mevis
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David I fixed the problem, and it was the most unlikely issue that was causing the problem... The headwire.The headwire going into the fan's body and wiring into the spead coil had a badly deteriorated wire sheath which was taped over with friction tape and so I cut the bad section of the headwire off and wired it back up and plugged it in and turned it on and sure enough its been working fine without so much as a whine or slowdown.  :clap:  :D 

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 Posted: Wed Mar 14th, 2018 11:11 pm
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David Allen
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Levi Mevis wrote: David I fixed the problem, and it was the most unlikely issue that was causing the problem... The headwire.The headwire going into the fan's body and wiring into the spead coil had a badly deteriorated wire sheath which was taped over with friction tape and so I cut the bad section of the headwire off and wired it back up and plugged it in and turned it on and sure enough its been working fine without so much as a whine or slowdown.  :clap:  :D 

Hey that is great!

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 Posted: Wed Mar 14th, 2018 11:14 pm
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Levi Mevis
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yes, it was quite interesting that a badly deteriorated headwire would cause the issues I was having with my fan...  :wondering:  :shock:
What are your thoughts on this David? What is it about a deteriorated headwire that would cause a fan to have the issues like mine did?

Last edited on Wed Mar 14th, 2018 11:15 pm by Levi Mevis

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