Questions about electromagnetic forces.

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    Electromagnetic Forces
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SUMMARY

This discussion addresses the feasibility of using electromagnets to repel permanent magnets with a target force of 175 psi and to move them a distance of 3 inches. It is confirmed that achieving this force is possible, contingent on the size of the electromagnet and the current supplied. While the response time of the electromagnet cannot be instantaneous, it can operate within hundredths of a second, making it suitable for rapid applications.

PREREQUISITES
  • Understanding of electromagnet design and specifications
  • Knowledge of electrical current and its effects on magnetic fields
  • Familiarity with force measurement units, specifically psi
  • Basic principles of magnetism, including repulsion and attraction
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  • Research electromagnet power requirements for achieving 175 psi
  • Explore materials suitable for high-current electromagnets to prevent overheating
  • Investigate methods for precise control of electromagnet pulsing
  • Learn about the physics of magnetism and its applications in engineering
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Engineers, physicists, and hobbyists interested in electromagnet applications, particularly those focusing on magnetic repulsion and rapid actuation systems.

Rick_Stiles
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Hi all,

I want to start off by saying that I am not too good with physics, so while explaining, if terms could be kept simple I would really appreciate it. :)

Here are my questions:

Can an electromagnet repel a permanent magnet with any significant amount of force? My target is around 175psi of force. Can this be done using magnets?

Furthermore, I need to move the permanent magnet 3". Is this possible?

Also, is there a limit to how quickly an electromagnet can be pulsed? I need things to be instant like a light switch.

I hope I asked my questions in a clear manner, but if anything isn't understood, feel free to ask for clarification.

Thanks a ton :)
 
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Sounds very clear. The only limit to the repulsive force is the size of the magnetics / how much current you can provide to the electromagnet (there are also material issues, like the electromagnet melting... but you prolly won't have to worry about that).
175psi is a lot of force, so it would take a lot of power.. but its doable. As is 3".

It couldn't be "instant," but it would be very fast.. like hundredths of a second or less.
 

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