Eddy current calculation question

[Yani Botsanovski]

Hello there!

I have seen some great eddy current brakes and wanted to learn more about it. The problem in the internet I can not the specific case I have in mind.
I searched the internet and found a great deal of material about magnetic forces. I cannot, however, find the specific case I'm interested in.
If I have moving body with magnets which goes through the aluminum plate how to calculate it.
What I need to know is how to calculate the thickness of the aluminum plate and the distance between the magnets in order to find the brake force and the length of the plate.

Sorry for my basic knowledge.

Wish you all the best and thank you in advance!

 

[berkeman]

Welcome to the PF, Yani.

It would help a lot if you posted the Google search terms you have used, along with some of the links to information that is not helping you (and why).

When I do a simple Google search, I get lots of hits that seem helpful...

https://www.google.com/search?client=firefox-b-1-d&q=eddy+current+braking+with+aluminum+plate

 

[Baluncore]

You will need to connect the top of the upper magnet to the bottom of the lower magnet to close the magnetic circuit.

Depending on the size and shape of the plate you might do better placing two magnets above and two below to form the magnetic circuit. That way you would not need the core to cross the plate.

Attached is a diagram with iron backing shown in black.