Flux Density, B, of a Cylindrical Magent

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SUMMARY

The discussion centers on calculating the flux density (B) of a cylindrical magnet, specifically addressing the variable z, which represents the distance from the pole face along the symmetrical axis. Participants clarify that z is not a fixed value and that the flux density changes with varying distances from the magnet. The conversation emphasizes the importance of using the correct equations to determine flux density at specific distances, both vertically and horizontally from the magnet.

PREREQUISITES
  • Understanding of magnetic flux density concepts
  • Familiarity with the equations governing magnetic fields
  • Basic knowledge of cylindrical magnet properties
  • Mechanical engineering principles related to electromagnetism
NEXT STEPS
  • Study the equations for calculating magnetic flux density in cylindrical magnets
  • Learn about the effects of distance on magnetic field strength
  • Explore the differences in magnetic field calculations for vertical versus horizontal distances
  • Investigate practical applications of flux density in engineering projects
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Mechanical engineering students, electrical engineers, and hobbyists interested in understanding magnetic fields and their calculations.

Bri1
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Hi, I'm trying to calculate the flux density of a magnet, I can get all but one of the values needed to calculate it. Does anyone know how/where to get the z(distance from a pole face on the symmetrical axis) value?
Screen Shot 2017-02-21 at 12.33.07 PM.png
 
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Bri1 said:
Hi, I'm trying to calculate the flux density of a magnet, I can get all but one of the values needed to calculate it. Does anyone know how/where to get the z(distance from a pole face on the symmetrical axis) value?View attachment 113520
Welcome to the PF.

z is just a variable. It looks like you have an equation there which would work along the z axis for varying distances, no?

BTW, is this for schoolwork or a hobby project?
 
berkeman said:
Welcome to the PF.

z is just a variable. It looks like you have an equation there which would work along the z axis for varying distances, no?

BTW, is this for schoolwork or a hobby project?

Thanks for responding, It's for school but it feels more like a hobby, I was thinking of just assuming a value for z. I'm studying mechanical engineering so electrical isn't my strong point. But I believe it might be a set value, maybe a distance from the pole face to the height of the flux field? but then I don't know the height of the flux field anyway

My reason for thinking its a set value is because the flux density of the magnet shouldn't change with respect to z not so?
 
Bri1 said:
Thanks for responding, It's for school but it feels more like a hobby, I was thinking of just assuming a value for z. I'm studying mechanical engineering so electrical isn't my strong point. But I believe it might be a set value, maybe a distance from the pole face to the height of the flux field? but then I don't know the height of the flux field anyway

My reason for thinking its a set value is because the flux density of the magnet shouldn't change with respect to z not so?
No, it definitely changes with distance z. It looks like this:

http://www.4physics.com/phy_demo/NewtonsNightmare/ShortBarMagnetBField.gif
ShortBarMagnetBField.gif

So yes, just use the equation to calculate the flux density at some distance z away from the pole face.
 
Oh okay thanks!

but what if the distance I wanted to calculate B for is horizontally across from the magnet instead of vertically away from it? A different formula?
 

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