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Post by Deleted on Feb 13, 2009 12:25:29 GMT -5
Ok i have 2 fans with issues, the first one i have is an Envirofan spinner model 448-N that makes a "hum-hum-hum" sound only when its on the lowest speed (not a steady hum) and the second fan i have is a late 70s early 80s Original thats making an annoying rattling sound, kind of like if you were to fill a glass jar up with screws and shake it around. any ideas?
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Post by Deleted on Feb 14, 2009 2:14:10 GMT -5
What type of speed control is on the Envirofan?
Something is loose on the Original.
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Post by Deleted on Feb 14, 2009 9:32:59 GMT -5
the envirofan has the original control on it. also on the oringinal, all the blades are tight as well
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Post by Cole S. on Feb 15, 2009 16:14:28 GMT -5
Something inside could be loose as well though, and I've never heard of blades making a rattling sound. (There's always a first) You may have to take it apart to find the problem.
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Post by Deleted on Feb 15, 2009 17:23:42 GMT -5
yeah i figured that would probably be what id have to do, it makes the sound when i turn the blades by hand too. Still cant figure out whats up with the envirofan too
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Post by Cole S. on Feb 15, 2009 22:25:57 GMT -5
If it makes the noise when you turn it by hand, you'll definitely want to open it up to take a look.
Does the Enviro make the noise only when a certain blade passes? (Ex. Blade, Blade, Blade, Hum, Blade, Blade, Blade, Hum...) If so, some motors just do that, and I'm not sure if there is a way to fix it, I've never tried.
Anyone?
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Post by Deleted on Feb 16, 2009 11:28:15 GMT -5
yeah it just makes a hum when it moves to one point
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Post by John Shelley on Feb 16, 2009 13:11:13 GMT -5
yeah it just makes a hum when it moves to one point normal for any motor to hum more at some position due to minor harmless variations in the magnetic fields for the rotor and stator it is more noticible on solid state controls and at slower speeds. |
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Post by Cole S. on Feb 16, 2009 13:29:02 GMT -5
That's what I was thinking as well John, now that I know what kind of hum it is. As John said, variable speed controls make it much more noticeable. Even on regular low speeds it can be noticed. The Nutone Decorator in my old house did that very same thing.
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Post by Deleted on Feb 16, 2009 16:23:43 GMT -5
yeah i have the original white envirofan control at the wall going to it as well, it only hums on speed 5 (lowest) speaking of Originals too, is brian hix still on here? i remember he was the Original expert
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Post by Deleted on Feb 16, 2009 19:18:16 GMT -5
Remove the blades from the Original, does it still make the same noise?
As for the Envirofan, try adding some paper washers between the blade arms and the motor.
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Post by Deleted on Feb 21, 2009 14:37:53 GMT -5
k, would the paper washers insulate the hum or something?
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Post by Cole S. on Feb 21, 2009 16:33:18 GMT -5
Yes, that's a good idea. Try it, the vibration would then be isolated from the blades, as the blades amplify the hum.
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Post by Jean Lemieux on Feb 22, 2009 1:41:46 GMT -5
Yeah I agree, try the paper thing between the blades and brackets for the Enviro. They will absorb the noise.
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Post by az2000 on Mar 28, 2009 16:59:16 GMT -5
yeah it just makes a hum when it moves to one point normal for any motor to hum more at some position due to minor harmless variations in the magnetic fields for the rotor and stator it is more noticeable on solid state controls and at slower speeds. Could a hum that occurs when the motor is at one position be a problem with the capacitors? I have two SMC Emperors (circa mid '80s). One makes the pulsating hum, occurring when one fan blade passes by. The other fan doesn't. The fan that hums has had 100 times more use than the other fan. (It also had the noise problem which I recently fixed with oiling, tightening bolts, adding rubber insulation at various points of contact.). I'm wondering if more use over its lifetime has something to do with it. If so, would the capacitors be worn out? Mark |
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