Can Rotating Magnets Create a Stronger Magnetic Field?

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Discussion Overview

The discussion revolves around the effects of rotating neodymium magnets on their magnetic fields, particularly at extremely high rotational speeds (near 1,000,000 rpm). Participants explore various questions related to the behavior of magnetic fields in relation to motion, attraction and repulsion between magnets, and the structural integrity of magnets at such speeds.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant inquires about the behavior of the magnetic field produced by a rotating magnet and whether it would attract or repel another identical magnet placed nearby.
  • Another participant questions the structural integrity of the magnet at high rotational speeds, suggesting that material stress may be a more pressing concern than the magnetic field effects.
  • There is a discussion about the historical context of 1 million rpm as a world record, with one participant seeking a source for this claim.
  • Participants express curiosity about the concept of 'spatial persistence' of the magnetic field and whether it changes immediately with movement or depends on distance.

Areas of Agreement / Disagreement

Participants express a range of views, with some focusing on the physical implications of high-speed rotation while others are more concerned with the magnetic interactions. The discussion remains unresolved regarding the specific effects on the magnetic field and the implications of high-speed rotation.

Contextual Notes

There are limitations regarding assumptions about the behavior of magnetic fields at high speeds and the structural properties of neodymium magnets under stress, which are not fully explored in the discussion.

Who May Find This Useful

Individuals interested in experimental physics, magnetism, material science, and those considering practical applications of high-speed rotating magnets may find this discussion relevant.

lovicodo
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hello, i have a doubt

i bought some small neodimium magnets 8x3mm
and now i would like to try some experiments with them

i have a doubt:
if i rotate one of these magnet around one of its parallel axis, very fast , near 1000000 rpm,
what happens to the magnetic field produced by the magnet?
if i bring another identical magnet near this rotating magnet, the magnet will be attracted or repelled?

if instead i mount two magnets on two opposite sides of a 1000000 rpm rotating wheel, what kind of 'resulting magnetic field' i will get?

does the magnetic field have 'a spatial persistence', i.e. does it change immediately as soon as the object is moved, or not? does this depend on the distance from the object?

sorry for the many questions, :)
thank you!
 
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lovicodo said:
does the magnetic field have 'a spatial persistence', i.e. does it change immediately as soon as the object is moved, or not? does this depend on the distance from the object?

so what do you think ?
what reading have you done so far?
 
lovicodo said:
near 1000000 rpm,
Will the magnet material stay intact at those speeds? This sounds dangerous. I don’t think that you should worry about the magnetic fields as much as the material stress and strain and strength.
 
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Likes   Reactions: CWatters and davenn
I think 1 million rpm was a world record only 10 years ago.
 
CWatters said:
I think 1 million rpm was a world record only 10 years ago.
Link? It must have been a pretty small magnet! :smile:

I'm reminded of YIG oscillators... https://en.wikipedia.org/wiki/YIG_sphere
 

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