Why Transformers Hum? | Unpaired Electrons & Magnetic Fields

  • Thread starter PanCerowany
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In summary, the humming noise produced by transformers is caused by a phenomenon called magnetostriction, where the varying magnetic field inside the transformer causes the core material to vibrate. This vibration is what produces the humming sound. While there may be other explanations given, magnetostriction is the correct explanation.
  • #1
PanCerowany
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Why transformers hum?

I have heard two versions. Oxygen has unpaired electrons and it reacts to changing magnetic field. Material that transformer is made of vibrates in changing magnetic field.

Both explanations tell that something vibrates in a magnetic field, but what it is?
 
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  • #3
PanCerowany said:
Why transformers hum?

I have heard two versions. Oxygen has unpaired electrons and it reacts to changing magnetic field. Material that transformer is made of vibrates in changing magnetic field.

Both explanations tell that something vibrates in a magnetic field, but what it is?

The second one is correct. It is called magnetostriction. The varying magnetic field inside the transformer influences the metal:

http://www.federalpacific.com/university/transnoise/chapter2.html [Broken]
http://www.federalpacific.com/university/transnoise/transnoise.html [Broken]

It is also possible that the windings themselves move around a bit from the forces acting on them.

Torquil
 
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  • #4
Why transformers hum?

Maybe because they don't know the words?
Boom Boom
 
  • #5
Magneto restiction?
 
  • #6
2nd one is correct it is called as magnetostriction
core material in transfprmer is feromagnetic in changing magnetic field of transformer there is slight change in shape of material which causes vibration
which produce huming noice
 
  • #7
OK, thanks.
 
  • #8
lol, www.electrical-riddles.com[/url] vs [PLAIN]www.electric-gibberish.info [Broken] - obviosuly more sense in riddles than in gibberish :rofl:
 
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1. Why do transformers hum?

Transformers hum due to the alternating magnetic fields created by the flow of electricity through the transformer's core. This movement of the magnetic field causes vibrations, resulting in the humming sound.

2. What causes the unpaired electrons in transformers?

Unpaired electrons can occur in the core material of transformers due to impurities or defects in the material. These unpaired electrons create an uneven distribution of charge, which contributes to the creation of a magnetic field.

3. How do unpaired electrons affect the efficiency of transformers?

Unpaired electrons can cause inefficiency in transformers by leading to core losses, which occur when the magnetic field is not perfectly aligned with the direction of current flow. This causes the transformer to consume more energy and generate excess heat, resulting in a decrease in efficiency.

4. Can the humming sound in transformers be reduced?

Yes, the humming sound in transformers can be reduced through the use of specialized core material, such as laminated steel, which helps to minimize the movement of the magnetic field and reduce vibrations. Proper maintenance and insulation can also help reduce the humming sound.

5. Is the humming sound in transformers dangerous?

No, the humming sound in transformers is not dangerous. It is simply a byproduct of the transformer's operation and does not pose any harm. However, if the humming sound is accompanied by other unusual noises, it may indicate a potential issue with the transformer that should be addressed by a professional.

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