AC ceiling fan...

T

TTman

Guest
Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

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On Tue, 8 Dec 2020 16:18:59 +0000, TTman <kraken.sankey@gmail.com>
wrote:

Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

Check the rubber vibration isolation joint(s).

If there are none, it would likely have been humming from day one.

RL
 
On Tue, 8 Dec 2020 16:18:59 +0000, TTman <kraken.sankey@gmail.com>
wrote:

Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

Check the rubber vibration isolation joint(s).

If there are none, it would likely have been humming from day one.

RL
 
On Tuesday, December 8, 2020 at 11:19:08 AM UTC-5, TTman wrote:
Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

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Check the capacitor.
 
On 08/12/2020 16:34, legg wrote:
On Tue, 8 Dec 2020 16:18:59 +0000, TTman <kraken.sankey@gmail.com
wrote:

Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

Check the rubber vibration isolation joint(s).

If there are none, it would likely have been humming from day one.

RL

Rubber mounts are good to the ceiling...

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On 08/12/2020 16:34, legg wrote:
On Tue, 8 Dec 2020 16:18:59 +0000, TTman <kraken.sankey@gmail.com
wrote:

Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

Check the rubber vibration isolation joint(s).

If there are none, it would likely have been humming from day one.

RL

Rubber mounts are good to the ceiling...

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On 08/12/2020 17:07, Fred Bloggs wrote:
On Tuesday, December 8, 2020 at 11:19:08 AM UTC-5, TTman wrote:
Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

--
This email has been checked for viruses by Avast antivirus software.
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Check the capacitor.
Check it in what way ? would it cause a \'beat frequency\' of ~5Hz ? ( UK
is 50Hz)
 
On 08/12/2020 17:07, Fred Bloggs wrote:
On Tuesday, December 8, 2020 at 11:19:08 AM UTC-5, TTman wrote:
Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

Check the capacitor.
Check it in what way ? would it cause a \'beat frequency\' of ~5Hz ? ( UK
is 50Hz)
 
On 2020-12-08, TTman <kraken.sankey@gmail.com> wrote:
Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

If it\'s not spinning it could be a bad capacitor on the motor
especially if it responds to a push start.

Could be the bearings need a lube

--
Jasen.
 
On 2020-12-08, TTman <kraken.sankey@gmail.com> wrote:
On 08/12/2020 17:07, Fred Bloggs wrote:
On Tuesday, December 8, 2020 at 11:19:08 AM UTC-5, TTman wrote:
Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

Check the capacitor.

Check it in what way ?

is it still a capacitor?

> would it cause a \'beat frequency\' of ~5Hz ? ( UK is 50Hz)

--
Jasen.
 
On 09/12/2020 06:26, Jasen Betts wrote:
On 2020-12-08, TTman <kraken.sankey@gmail.com> wrote:
Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

If it\'s not spinning it could be a bad capacitor on the motor
especially if it responds to a push start.

Could be the bearings need a lube

It all works fine, apart from the fact that it \'hums\'....

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On Wednesday, December 9, 2020 at 4:08:39 AM UTC-5, TTman wrote:
On 09/12/2020 06:26, Jasen Betts wrote:
On 2020-12-08, TTman <kraken...@gmail.com> wrote:
Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

If it\'s not spinning it could be a bad capacitor on the motor
especially if it responds to a push start.

Could be the bearings need a lube

It all works fine, apart from the fact that it \'hums\'....
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Remove the new hearing aides you just recently got?
 
On Tue, 8 Dec 2020 22:44:09 +0000, TTman <kraken.sankey@gmail.com>
wrote:

On 08/12/2020 16:34, legg wrote:
On Tue, 8 Dec 2020 16:18:59 +0000, TTman <kraken.sankey@gmail.com
wrote:

Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

Check the rubber vibration isolation joint(s).

If there are none, it would likely have been humming from day one.

RL

Rubber mounts are good to the ceiling...

Not dried out or cut through?

RL
 
On Tuesday, December 8, 2020 at 5:45:25 PM UTC-5, TTman wrote:
On 08/12/2020 17:07, Fred Bloggs wrote:
On Tuesday, December 8, 2020 at 11:19:08 AM UTC-5, TTman wrote:
Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

Check the capacitor.

Check it in what way ? would it cause a \'beat frequency\' of ~5Hz ? ( UK
is 50Hz)
No- your original description made it sound like it was stalled. Now it sounds like it\'s not coming up to speed. Unless you have a motor repair shop, give it to a metals recycler.
 
TTman wrote:

On 08/12/2020 17:07, Fred Bloggs wrote:
On Tuesday, December 8, 2020 at 11:19:08 AM UTC-5, TTman wrote:
Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

Check the capacitor.

Check it in what way ? would it cause a \'beat frequency\' of ~5Hz ? ( UK
is 50Hz)
Yes, it could. If the cap has lost some of its value, it will give the
wrong phase shift, and the motor would vibrate at twice mains frequency. As
the rotor slips, the shorting bars in the squirrel cage occasionally line up
with the stator poles and give different current and torque. So, the slow
throbbing humm you hear is the slip of the rotor.

Jon
 
On Tuesday, December 8, 2020 at 8:19:08 AM UTC-8, TTman wrote:
Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

Is the fan a variable-speed model? Motors differ in their characteristics,
and a ceiling-fan motor is often an oddball low-torque type.
 
On 09/12/2020 18:46, Jon Elson wrote:
TTman wrote:

On 08/12/2020 17:07, Fred Bloggs wrote:
On Tuesday, December 8, 2020 at 11:19:08 AM UTC-5, TTman wrote:
Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

Check the capacitor.

Check it in what way ? would it cause a \'beat frequency\' of ~5Hz ? ( UK
is 50Hz)
Yes, it could. If the cap has lost some of its value, it will give the
wrong phase shift, and the motor would vibrate at twice mains frequency. As
the rotor slips, the shorting bars in the squirrel cage occasionally line up
with the stator poles and give different current and torque. So, the slow
throbbing humm you hear is the slip of the rotor.

Jon
Thanks, that makes sense to me with my limited AC theory of nearly 50
years ago...

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On 09/12/2020 21:36, whit3rd wrote:
On Tuesday, December 8, 2020 at 8:19:08 AM UTC-8, TTman wrote:
Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

Is the fan a variable-speed model? Motors differ in their characteristics,
and a ceiling-fan motor is often an oddball low-torque type.
Yes, three speeds, with reverse facility...Low speed it\'s quiet. Med
speed it\'s irritating. High speed , forget it. ( night time sleeping,
that is). Daytime in a lounge with TV on, it\'s probably unnoticible...

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On Wednesday, December 9, 2020 at 1:46:20 PM UTC-5, Jon Elson wrote:
TTman wrote:

On 08/12/2020 17:07, Fred Bloggs wrote:
On Tuesday, December 8, 2020 at 11:19:08 AM UTC-5, TTman wrote:
Mine is \'hummimg now...Is there a fix or is it a bin job? Loose
laminations in the motor perhaps ?

--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

Check the capacitor.

Check it in what way ? would it cause a \'beat frequency\' of ~5Hz ? ( UK
is 50Hz)
Yes, it could. If the cap has lost some of its value, it will give the
wrong phase shift, and the motor would vibrate at twice mains frequency. As
the rotor slips, the shorting bars in the squirrel cage occasionally line up
with the stator poles and give different current and torque. So, the slow
throbbing humm you hear is the slip of the rotor.

Jon

Possible but sounds far fetched. Simplest explanation is usually best, and that would be worn out of round sleeve bearing for shaft.
 
On Wednesday, December 9, 2020 at 2:38:18 PM UTC-8, TTman wrote:
On 09/12/2020 21:36, whit3rd wrote:
On Tuesday, December 8, 2020 at 8:19:08 AM UTC-8, TTman wrote:
Mine is \'hummimg now...Is there a fix or is it a bin job?

Is the fan a variable-speed model? Motors differ in their characteristics,
and a ceiling-fan motor is often an oddball low-torque type.

Yes, three speeds, with reverse facility...Low speed it\'s quiet. Med
speed it\'s irritating. High speed , forget it....

That would be consistent with torque causing the hum, and perhaps just
a clean/lube will lessen the required torque. For some motors, bearing wear
can cause the rotor to move off-center in the stator windings, which is
worth checking. Minor bearing wear is OK if you relube with a solids-in-suspension
oil (I kinda like Tri-Flow, with PTFE (?)microbeads).
 

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