Air friction in rotating ring magnet

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SUMMARY

This discussion focuses on calculating air friction for a rotating middle ring magnet positioned between two other ring magnets. The inquiry emphasizes the need to understand the polarization of the magnets and the stabilization method for the floating magnet. Additionally, the suggestion to use a vacuum chamber is presented as a theoretical solution to eliminate air friction, allowing for perpetual rotation. The conversation highlights the complexity of air friction calculations and the importance of understanding the system's dynamics.

PREREQUISITES
  • Understanding of magnetic polarization techniques
  • Basic principles of air friction and resistance
  • Knowledge of rotational dynamics
  • Familiarity with vacuum systems and their applications
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  • Research methods for calculating air friction in rotating objects
  • Explore the effects of magnetic polarization on stability
  • Learn about vacuum chamber experiments and their relevance in physics
  • Investigate rotational dynamics and forces in magnetic systems
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Physicists, engineering students, hobbyists in magnetics, and anyone interested in the dynamics of rotating magnetic systems.

Jaap
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TL;DR
Air friction in rotating ring magnet
As can be seen below we have 3 ring magnets. The middel one floats in between the other two. We want to know how to calculate the air friction of the middle ring magnet if this rotates.
Schematic ringmagnets.jpeg
 
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Hi. I do not have scarce knowledge of air friction and it seems complicated. Why don't you put your system in a vacuum chamber ? Without friction the intermediate disk would rotate forever theoretically.
 
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Welcome to PF. :smile:

Jaap said:
As can be seen below we have 3 ring magnets. The middel one floats in between the other two. We want to know how to calculate the air friction of the middle ring magnet if this rotates.

First some questions -- How are the 3 ring magnets polarized? Vertically or horizontally or some mix? What stabilizes the middle ring magnet between the other 2? How do you generate a rotational force to spin up the middle magnetic ring?

And on your question about air resistance -- what have you found in your research so far?

Finally, is this question for schoolwork? If not for scholwork, what is the application? Thanks.
 

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