# Thread: Magnet for homemade metal separator

1. alexbelousov Guest

## Magnet for homemade metal separator

Me and my friend want to make a strong as possible (made from permanent magnets) homemade metal separator for seeds. We are not good in the physics of such level, so we need consultation.
We want to try neodymium magnets for our separator. We learned that magnetic flux density could be reached 1.5T (tesla) at N52-N54 neodymium magnets. But we also learned two important things;

First that magnetic flux density of the magnets depends on the geometry (disc/block/sphere) and size of the magnet;

Second magnetic flux density could be raised if using the system of magnets with special packing of these magnets.

So I have a few questions

1) What geometry of the magnet will give the maximum magnetic flux density?

2) How can I calculate the size of magnet with highest magnetic flux density? For example efficient size of magnet blocks.

3) What packing of magnets will give the highest magnetic flux density? How can I calculate the best packing?

Maybe somebody here can help us.

2. ## See Google

For this kind of application you will need a reference textbook or. Google etc articles.
Forum members who might know would be cutting their own throats by revealing hard won information here.

3. You're asking for free engineering services. Not likely to happen.

As John says. Google may be your best friend.

4. thomaslamotte Guest
Originally Posted by alexbelousov
Me and my friend want to make a strong as possible (made from permanent magnets) homemade metal separator for seeds. We are not good in the physics of such level, so we need consultation.
We want to try neodymium magnets for our separator. We learned that magnetic flux density could be reached 1.5T (tesla) at N52-N54 neodymium magnets. But we also learned two important things;

First that magnetic flux density of the magnets depends on the geometry (disc/block/sphere) and size of the magnet;

Second magnetic flux density could be raised if using the system of magnets with special packing of these magnets.

So I have a few questions

1) What geometry of the magnet will give the maximum magnetic flux density?

2) How can I calculate the size of magnet with highest magnetic flux density? For example efficient size of magnet blocks.

3) What packing of magnets will give the highest magnetic flux density? How can I calculate the best packing?

Maybe somebody here can help us.