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[yialousa1971]

Open a window .....

Or just ignore GR and Miltiades as they are both clueless when it comes to electrics/electronics. They should stick to their respective fields, ie. playing with computers/Cook ware specialist.

[yialousa1971]

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.

I'm not confusing the armature at all . We do change brushes , especially on machinery such as Fruit Juicers , extractors , and most other motors. The brushes once totally worn render the appliance unworkable , the armature behaves in a way the same as a motor car's crankshaft in that a partly worn armature , one that has "body" damage , "scratches "on the body will fail to perform for long and will eventually fail to function.

I'm not an engineer but over the years of involvement with repairs of an assortment of Catering equipment , by necessity you learn something.

Milti, the armature gets dirty (soot) from the constant rubbing with the brushes resulting in loss of conductivity but it can be easily cleaned with a solvent and made nice and shiny again. The brushes are the ones that wear because they are intentionally made of a much softer copper material to protect the armature. Even if the armature gets a bit thinner after many years of use, the spring tension of the brushes will ensure that good contact is still made with it.

Of course, it may be in your interests to REPLACE the part than clean it...

The brushes are the ones that wear because they are intentionally made of a much softer copper material to protect the armature.

The brushes are not made of Copper, they are made of Carbon duh.... Soft Copper, Ive heard it all now it's the contacts on the armature that are made of Copper.

[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.

I'm not confusing the armature at all . We do change brushes , especially on machinery such as Fruit Juicers , extractors , and most other motors. The brushes once totally worn render the appliance unworkable , the armature behaves in a way the same as a motor car's crankshaft in that a partly worn armature , one that has "body" damage , "scratches "on the body will fail to perform for long and will eventually fail to function.

I'm not an engineer but over the years of involvement with repairs of an assortment of Catering equipment , by necessity you learn something.

Milti, the armature gets dirty (soot) from the constant rubbing with the brushes resulting in loss of conductivity but it can be easily cleaned with a solvent and made nice and shiny again. The brushes are the ones that wear because they are intentionally made of a much softer copper material to protect the armature. Even if the armature gets a bit thinner after many years of use, the spring tension of the brushes will ensure that good contact is still made with it.

Of course, it may be in your interests to REPLACE the part than clean it...

The brushes are the ones that wear because they are intentionally made of a much softer copper material to protect the armature.

The brushes are not made of Copper, they are made of Carbon duh.... Soft Copper, Ive heard it all now it's the contacts on the armature that are made of Copper.

I just couldn't remember the word "Carbon" at the time so I improvised! But anyway, Carbon brushes are made by mixing Carbon with Copper for better conductivity so don’t assume its pure carbon being used just because they’re called “Carbon brushes”!

[yialousa1971]

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.

I'm not confusing the armature at all . We do change brushes , especially on machinery such as Fruit Juicers , extractors , and most other motors. The brushes once totally worn render the appliance unworkable , the armature behaves in a way the same as a motor car's crankshaft in that a partly worn armature , one that has "body" damage , "scratches "on the body will fail to perform for long and will eventually fail to function.

I'm not an engineer but over the years of involvement with repairs of an assortment of Catering equipment , by necessity you learn something.

Why are you both talking about brushes here, this is a domestic fan motor which will be brush less. Motors with brushs are only used where high power/torque applications such Power tools or food mixers.

[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.

I'm not confusing the armature at all . We do change brushes , especially on machinery such as Fruit Juicers , extractors , and most other motors. The brushes once totally worn render the appliance unworkable , the armature behaves in a way the same as a motor car's crankshaft in that a partly worn armature , one that has "body" damage , "scratches "on the body will fail to perform for long and will eventually fail to function.

I'm not an engineer but over the years of involvement with repairs of an assortment of Catering equipment , by necessity you learn something.

Why are you both talking about brushes here, this is a domestic fan motor which will be brush less. Motors with brushs are only used where high power/torque applications such Power tools or food mixers.

Because we moved on from fans and were talking about food mixers and such!

[yialousa1971]

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.

I'm not confusing the armature at all . We do change brushes , especially on machinery such as Fruit Juicers , extractors , and most other motors. The brushes once totally worn render the appliance unworkable , the armature behaves in a way the same as a motor car's crankshaft in that a partly worn armature , one that has "body" damage , "scratches "on the body will fail to perform for long and will eventually fail to function.

I'm not an engineer but over the years of involvement with repairs of an assortment of Catering equipment , by necessity you learn something.

Milti, the armature gets dirty (soot) from the constant rubbing with the brushes resulting in loss of conductivity but it can be easily cleaned with a solvent and made nice and shiny again. The brushes are the ones that wear because they are intentionally made of a much softer copper material to protect the armature. Even if the armature gets a bit thinner after many years of use, the spring tension of the brushes will ensure that good contact is still made with it.

Of course, it may be in your interests to REPLACE the part than clean it...

The brushes are the ones that wear because they are intentionally made of a much softer copper material to protect the armature.

The brushes are not made of Copper, they are made of Carbon duh.... Soft Copper, Ive heard it all now it's the contacts on the armature that are made of Copper.

I just couldn't remember the word "Carbon" at the time so I improvised! But anyway, Carbon brushes are made by mixing Carbon with Copper for better conductivity so don’t assume its pure carbon being used just because they’re called “Carbon brushes”!

Remember now your not talking to Miltiades, thats not quite wright for all brushes. See here:-http://www.pic.co.th/material02.htm

[yialousa1971]

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 b
ut 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.

I'm not confusing the armature at all . We do change brushes , especially on machinery such as Fruit Juicers , extractors , and most other motors. The brushes once totally worn render the appliance unworkable , the armature behaves in a way the same as a motor car's crankshaft in that a partly worn armature , one that has "body" damage , "scratches "on the body will fail to perform for long and will eventually fail to function.

I'm not an engineer but over the years of involvement with repairs of an assortment of Catering equipment , by necessity you learn something.

Why are you both talking about brushes here, this is a domestic fan motor which will be brush less. Motors with brushs are only used where high power/torque applications such Power tools or food mixers.

Because we moved on from fans and were talking about food mixers and such!

I don't believe you, I bet you didn't even know brush less motors existed.

You and Miltiades would make a fine pair, reminds me of Laurel and Hardy.

[halil]

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?

i didn!t read what the others said .

by reducing power u will reduce speed also the noise but u can not get over the noise .

u must put the power off first of all and take off your fan . Clean it with brush and blower for a start .
seconed take off the fan wheel and clean it with contact cleaner .properly it is rusty from the dew . clean it with zero numbered emery paper . after that apply some grease .

Are u sure your noise does not come from the vibration of the fan .İs it properly fixed on the wall ? with your finger press the fan housing, fan blower assembly - does the noise decrease or stop?

good luck

it might be good for us to tell what is the brand of the fan ? from here we might also figure out if fan has brush motor or brushless motor .properly it is brushless motor used in this fan . watch out the washers as well . or bearings or mill .... mill might need cleaning and greasing as well . replacement of bearings needs great attention .....

best thing Kurupetos get new one !

[Zorba]

I don't think you can make fans less noisy,unless their team is losing.

[halil]

I don't think you can make fans less noisy,unless their team is losing.

good point . u make me thanks for it .... this time of the night