Finding airgap flux from a permanent magnet

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SUMMARY

The discussion centers on calculating the magneto-motive force (MMF) of a permanent magnet and its application in determining magnetic flux in a circuit with an air gap. The formula MMF = Hc * length * area is confirmed as valid for calculating MMF, where Hc is the coercive field strength in kA/m. Additionally, the relationship Flux = ugap * MMF is acknowledged for finding the flux in the magnetic circuit. A recommendation for a free finite element analysis (FEA) software, QuickField, is provided for practical experimentation.

PREREQUISITES
  • Understanding of magneto-motive force (MMF)
  • Knowledge of coercive field strength (Hc) in kA/m
  • Familiarity with magnetic flux calculations
  • Basic proficiency in using finite element analysis (FEA) tools
NEXT STEPS
  • Research the application of MMF in magnetic circuit design
  • Learn about the properties of permanent magnets and their coercive field strength
  • Explore the use of QuickField for simulating magnetic circuits
  • Investigate advanced topics in magnetic flux and air gap effects
USEFUL FOR

Engineers, physicists, and students interested in magnetic circuit design, particularly those working with permanent magnets and finite element analysis.

nickw1881
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The problem I am having is that I cannot seem to find the magneto-motive force of a permanent magnet. Most material tables give a Hc in kA/m, which I take to mean I multiply by the length of the magnet, then by the area of the magnet to get my total magneto-motive force.

So does MMF=Hc*length*area? Can I use this formula in Flux=ugap*MMF?

My ultimate goal is to find the flux in a magnetic circuit (driven by a permanent magnet) with a small air gap. If there is a tutorial someone could point me to I would be grateful. Google only returns a bunch of stuff on high tech magnet research and some pay-per-view FEA demonstration papers.
 
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Nick,

I'm not sure how to answer your question because I'm learning this, too. But there's a FEA program you can get a free student version of to tinker with. Check out this:

http://www.quickfield.com/free_soft.htm
 

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