Why Transformers Hum? | Unpaired Electrons & Magnetic Fields

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Discussion Overview

The discussion centers on the phenomenon of humming in transformers, exploring potential explanations related to magnetic fields and material properties. Participants examine the causes of this humming, including concepts like magnetostriction and the behavior of materials in changing magnetic fields.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants suggest that the humming is due to unpaired electrons in oxygen reacting to changing magnetic fields.
  • Others propose that the primary cause is magnetostriction, where the core material of the transformer vibrates due to changes in the magnetic field.
  • A participant mentions that the windings of the transformer may also move slightly due to the forces acting on them.
  • There is a humorous remark questioning whether transformers hum because they "don't know the words."
  • One participant expresses confusion over the term "magneto restiction," possibly a misspelling of magnetostriction.
  • Another participant reiterates that magnetostriction is the correct explanation, emphasizing the ferromagnetic properties of the core material and its shape change in a magnetic field.

Areas of Agreement / Disagreement

Participants express differing views on the causes of humming in transformers, with some supporting the idea of magnetostriction while others mention alternative explanations. The discussion does not reach a consensus on a single cause.

Contextual Notes

Some claims depend on specific definitions of terms like magnetostriction and may involve assumptions about the materials used in transformers. The discussion includes varying levels of technical understanding among participants.

Who May Find This Useful

Individuals interested in electrical engineering, physics, or those curious about the operational principles of transformers may find this discussion relevant.

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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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
http://www.federalpacific.com/university/transnoise/transnoise.html

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

Torquil
 
Last edited by a moderator:
Why transformers hum?

Maybe because they don't know the words?
Boom Boom
 
Magneto restiction?
 
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
 
OK, thanks.
 
lol, www.electrical-riddles.com[/url] vs [PLAIN]www.electric-gibberish.info - obviosuly more sense in riddles than in gibberish :smile:
 
Last edited by a moderator:

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