Identifying Magnet Grade for FEMM Simulation: Neodymium Cylinder Magnets

  • #1
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I need indetify a magnet grade from an academic paper but I only have the surface fields and the saturation magnetization.
Hello. I need to indetify a magnet grade from an academic paper, they dont mention what grade is . I am trying to simulate de contact force bewten two magnets on FEMM and to validate the results I am using one ecuation of that paper, but they dont specify what grade the Neodymium magnet is, only give the data that they got of a gaussmeter and the saturation magnetization the magnets are cylinders with D=3mm and H=1.5mm. The data of the gaussmeter is B= 1.07 T and the saturation magnetization M = (0.859) MA/m.

I tried to solve an equation that I found
1699480620658.png
and with Br I can search to what grade is, but when a solve the Br is higher even for N52 magnets.

Please Help me, I attach a part of the paper perhaps there is something that I can see.

Thank you

1699480455969.png
 
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  • #2
I don’t know what “grade” is, but they list the dimensions, magnetic properties and the name of the manufacturer! Just look it up.
 
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  • #3
marcusl said:
I don’t know what “grade” is, but they list the dimensions, magnetic properties and the name of the manufacturer! Just look it up.
Yeah, I hadn't heard that term either, but from a web search it does seem to be something that the manufacturer would specify:

1699488199729.png

https://www.kjmagnetics.com/blog.asp?p=magnet-grade
 
  • #4
Need more information. The formula you gave doesn't help if we don't know how the coordinates used to derive it were setup. Could you identify the paper and where you got the equation?
 
  • #5
Thank you for your answers. Like berkeman wrote, the grade is the classification of neodymium magnets for example N52 or N40. The paper is :
"Magnetostatic interactions and forces between cylindrical permanent magnets" by
David Vokoun, Marco Beleggia.

This paper used a permanent magnet, but they don’t explain what grade is, I need to know because depend on the grade are the properties for example the magnet strength. The paper only mention that they measured with a gaussmeter and got B= 1.07 T that I supposed is the magnetic field in the surface, so there is one equation in (https://www.supermagnete.de/eng/faq/How-do-you-calculate-the-magnetic-flux-density) to calculate the magnetic field on the surface I tried to use that equation to get the Br (residual magnetism) and with that I could found to what grade is. But it does not work. Because it gave me Br=2.41 T con z=0mm, and there aren´t materials with that Br.
 
  • #6
Hi guys, finally I guess that I found the answer. The saturation magnetization is the higher part of the curve in a demagnetization curve :

1699984867912.png

image took from:
(https://mriquestions.com/magnetizing-metal.html)

So, with the saturation magnetization M = (0.859) MA/m I just search a magnet with the nearest value perhaps the NdFeB N30, it depends on the supplier.

For example, I found this supplier.
https://www.arnoldmagnetics.com/wp-content/uploads/2017/11/N30-151021.pdf
and the magnetic saturation is 11 kGauss comparing between M = (0.859) MA/m=10.7 KGauss I think its ok.

I hope this could help to someone.
 

Related to Identifying Magnet Grade for FEMM Simulation: Neodymium Cylinder Magnets

What is the importance of identifying the correct magnet grade for FEMM simulations?

Identifying the correct magnet grade is crucial for FEMM simulations because it ensures accurate modeling of the magnetic field and performance. Different grades of neodymium magnets have varying magnetic properties, such as remanence (Br), coercivity (Hc), and maximum energy product (BHmax). Using the correct grade allows for precise predictions of magnetic behavior in various applications.

How can I determine the magnet grade of my neodymium cylinder magnet?

You can determine the magnet grade by referring to the specifications provided by the manufacturer or supplier. These specifications typically include the grade designation (e.g., N35, N52), along with the key magnetic properties. If this information is not available, you may need to measure the magnetic properties using specialized equipment and compare them with standard grade specifications.

What are the common grades of neodymium magnets used in FEMM simulations?

Common grades of neodymium magnets used in FEMM simulations include N35, N42, N48, and N52. Each grade has specific magnetic properties, with higher numbers generally indicating stronger magnetic performance. The choice of grade depends on the requirements of the specific application being modeled in the simulation.

How does the magnet grade affect the results of a FEMM simulation?

The magnet grade affects the results of a FEMM simulation by influencing the strength and distribution of the magnetic field. Higher grade magnets typically produce stronger magnetic fields, which can impact the force, torque, and overall performance of the magnetic system being analyzed. Accurate grade identification ensures that the simulation results closely match real-world behavior.

Can I use a generic magnet grade if I don't know the exact grade of my neodymium magnet?

While it is possible to use a generic magnet grade if the exact grade is unknown, this approach may lead to less accurate simulation results. It is recommended to use the most precise information available or to conduct measurements to determine the specific grade. Using a generic grade could result in discrepancies between the simulated and actual performance of the magnet.

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