Finding airgap flux from a permanent magnet

In summary, the user is having difficulty finding the magneto-motive force of a permanent magnet and is wondering if the MMF can be calculated using the formula MMF=Hc*length*area. They are also looking for a tutorial or resources on how to find the flux in a magnetic circuit with a small air gap, specifically using a permanent magnet. Another user suggests using a free FEA program for experimentation.
  • #1
nickw1881
3
0
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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  • #2
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
 

FAQ: Finding airgap flux from a permanent magnet

How is airgap flux calculated from a permanent magnet?

The airgap flux can be calculated by using the formula B = μ0μrH, where B is the magnetic flux density, μ0 is the permeability of free space, μr is the relative permeability of the material in the airgap, and H is the magnetic field strength.

What is the purpose of finding airgap flux from a permanent magnet?

Finding airgap flux is important in designing and optimizing electromagnetic devices, such as motors and generators. It helps determine the performance and efficiency of these devices and allows for improvements to be made.

How is the airgap flux affected by the distance between the magnet and the airgap?

The airgap flux is inversely proportional to the distance between the magnet and the airgap. This means that as the distance increases, the airgap flux decreases.

Can airgap flux be measured experimentally?

Yes, airgap flux can be measured using a magnetic flux meter or by using a Hall effect sensor. These methods involve placing the device at different points in the airgap and measuring the magnetic flux density.

How does the shape of the magnet affect the airgap flux?

The shape of the magnet can affect the airgap flux by changing the distribution of the magnetic field in the airgap. For example, a magnet with a larger surface area will have a stronger airgap flux compared to a magnet with the same strength but a smaller surface area.

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