Repulsive force btwn electromagnet and permenant magnet (NdFeB)

[ajax21]

hi all, i am currently working on a magnet generator/motor and i have some qns on electromagnetism.

i am currently trying to find out how much does my electromagnet (ferrite core) requires in order to repel a permenant magnet, in this case, a cylindrical NdFeB magnet.

i have been trying to find out from the web and libraries regarding the force between the magnets and the closest i have come to is

http://en.wikipedia.org/wiki/Magnet#...magnetic_poles

there r so many other equations but none of them involves an electromagnet and a permanent magnet. so i would like to ask for advice and correction. thanks!

p.s: posted in electrical engineering earlier before realizing there's a classical physics section. my bad!

 

[eljose79]

Hello! It's great to hear that you are working on a magnet generator/motor and have some questions about electromagnetism. Let me see if I can provide some guidance and clarification for you.

First of all, the force between two magnets is determined by their magnetic fields and the distance between them. This is known as the magnetic force and can be calculated using the following equation:

F = (m1 * m2 * μ0) / (4π * r^2)

Where F is the force between the two magnets, m1 and m2 are the magnetic dipole moments of the magnets, μ0 is the permeability of free space, and r is the distance between the magnets.

In your case, you are trying to find the force between an electromagnet (with a ferrite core) and a permanent magnet (cylindrical NdFeB magnet). To calculate this force, you will need to know the magnetic dipole moment of each magnet and the distance between them.

The magnetic dipole moment of a magnet is a measure of its strength and can be calculated by multiplying its magnetic moment (m) by its length (l). So for your electromagnet, you will need to know its magnetic moment and length, and for the cylindrical NdFeB magnet, you will need to know its magnetic moment and diameter.

Once you have these values, you can plug them into the magnetic force equation to calculate the force between the two magnets. Keep in mind that the force will vary depending on the distance between the magnets, so you may need to do some experimentation to find the optimal distance for repelling the permanent magnet.

I hope this helps answer your question and provides some guidance for your project. If you have any further questions, please don't hesitate to ask. Good luck with your magnet generator/motor!