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[kurupetos]

I have a noisy fan.
Will reducing the voltage (e.g. from 12V to 9V) reduce the speed, and therefore the noice?

It seems like it since:

P = V . I = F . v (Power = Voltage * Current = Force * velocity)

What do u think? Any advice?

[bill cobbett]

Computer fan?

[kurupetos]

Computer fan?

No, bathroom fan.

[Get Real!]

Noise is resistance. If you disassemble the fan, clean it thoroughly, and oil the bush/bearing it’ll make a world of a difference. This applies to everything that rotates on an axle, fans or otherwise.

[Sotos]

I made my computer case fans quieter by slowing them down. I did this with software but I guess that the software just makes the motherboard supply less electricity to the fan.

[Get Real!]

I made my computer case fans quieter by slowing them down. I did this with software but I guess that the software just makes the motherboard supply less electricity to the fan.

Any current not going to the fans must be emitted as heat via a resistor so you've basicly increased the heat inside the case. Had you cleaned and oiled them they’d work a lot more silent. Grab your PC and come and see me if you like, and I'll take you through the fine art of fan noise reduction...

[miltiades]

In my experience dealing with fan motors for refrigeration , ice machines , convection ovens and other appliances requiring a fan motor which becomes noisy , is that the bearing or armature has gone . WD 40 might temporarily alleviate the noise but it will not cure it . Change to a new one for trouble free ...fun .. !!!

[Get Real!]

In my experience dealing with fan motors for refrigeration , ice machines , convection ovens and other appliances requiring a fan motor which becomes noisy , is that the bearing or armature has gone . WD 40 might temporarily alleviate the noise but it will not cure it . Change to a new one for trouble free ...fun .. !!!

If the armature was gone it wouldn’t work at all! A worn out bush is easily identifiable because the fins would begin to scrape the sides if the fan is housed or wobble if not.

[miltiades]

In my experience dealing with fan motors for refrigeration , ice machines , convection ovens and other appliances requiring a fan motor which becomes noisy , is that the bearing or armature has gone . WD 40 might temporarily alleviate the noise but it will not cure it . Change to a new one for trouble free ...fun .. !!!

If the armature was gone it wouldn’t work at all! A worn out bush is easily identifiable because the fins would begin to scrape the sides if the fan is housed or wobble if not.

A slightly worn armature would still work but rather noisy , but you are correct that if the armature is burned out the motor would not work.
Noise from the motor is usually the bearing.

[Get Real!]

In my experience dealing with fan motors for refrigeration , ice machines , convection ovens and other appliances requiring a fan motor which becomes noisy , is that the bearing or armature has gone . WD 40 might temporarily alleviate the noise but it will not cure it . Change to a new one for trouble free ...fun .. !!!

If the armature was gone it wouldn’t work at all! A worn out bush is easily identifiable because the fins would begin to scrape the sides if the fan is housed or wobble if not.

A slightly worn armature would still work but rather noisy , but you are correct that if the armature is burned out the motor would not work.
Noise from the motor is usually the bearing.

You are confusing the armature with the motor's brushes that wear; good motors have replaceable brushes btw.