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 Posted: Mon Oct 25th, 2021 04:14 pm
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Chanaka Jinasena
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Hello,
I have around 15 old Emerson "fern leaf" short nose ceiling fans which need restoration.

Started with one today and cleaned everything up first of all.

Then tried applying power to it and nothing happens. It does not move.

Checked that there is continuity across all windings by connecting power to it with a bulb in series and the bulb does light up.

Please advice what I should check on the windings and the rotor.

Photos attached are before cleaning.



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 Posted: Mon Oct 25th, 2021 06:12 pm
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Stan Adams
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First question is what size bulb did you have in series. If you have around a 500 watt & it lights up bright, bad news. If it is smaller, check the magnets, you should have equal pull on all of them. If one is weak, it will need a rewind. Don't leave it plugged in too long without the rotor.If all of this checks out, check the gap between the rotor & the magnets. If the shaft is badly worn (hard to tell in the photos), that will allow the rotor to connect with the magnets & bind. If it is, you will need a new shaft or a machinist to repair it. If the shaft is not worn & the gap between the rotor & magnets is uneven, you may have to file down the laminates where there is not enough gap with the rotor.

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 Posted: Mon Oct 25th, 2021 06:20 pm
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Chanaka Jinasena
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Thank you.
With power applied to the coils, should there be more magnetism on the segments than when there is no power applied ?

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 Posted: Mon Oct 25th, 2021 06:58 pm
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Stan Adams
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There should be nearly no magnetism unpowered, but fairly strong magnetism powered.

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 Posted: Tue Oct 26th, 2021 09:22 am
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Chanaka Jinasena
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Ok so from my lot of fans I found a few that do magnetize when power is applied. Cleaned and assembled one just to test and it does spin but no where near fast enough. 

If I concentrate I can follow one blade going round and round with my eyes. 

These seem to be model 3012 with 133 watts and 60 HZ. 

Strange, because the local voltage is 230v 50HZ

So that must mean that these fans have all been rewound locally for 230V. 

I own an industrial motor manufacturing company and am able to re-wind these fan coils if needed. 

Was a version of this originally made for 230V ?

Does anyone know the wire gauge and number of windings per coil as per original for 110V 133W ?

Last edited on Tue Oct 26th, 2021 09:23 am by Chanaka Jinasena

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 Posted: Tue Oct 26th, 2021 06:08 pm
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Chanaka Jinasena
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Ok... so I took another fan which show magnetism to the coils when power is applied and assembled that one for testing.
The first tested fan turns at 120 RPM

The second tested fan turns at 200 RPM.

What could cause the reduction in RPM on the first fan ?

What grade of oil should be used in it and how much oil ?

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 Posted: Wed Oct 27th, 2021 05:21 am
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Chanaka Jinasena
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 Posted: Fri Oct 29th, 2021 01:54 pm
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David Hoatson
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Chanaka Jinasena wrote:

Are you dividing the RPM reading by the ratio of the two diameters?

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 Posted: Fri Oct 29th, 2021 01:59 pm
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Chanaka Jinasena
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Yes. I have measured the diameters of the 2 rotating wheels and calculated the shaft RPM.
I have a couple of fans which do 200 RPM and a couple that are slower. 

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