Largest possible size and power of a permanent magnet?

[Order]

The largest neodymium magnets I have seen have been no larger than 3"x6"x3". I'm wondering if there is a maximum physical size barrier in the magnetization process of the metals? Would it be possible to have a NdFeB magnet that is 1'^3?

 

[MagMike]

Since fully sintered NdFeB magnets are made through powder metallurgy, there are inherent size-limiting factors from that process.

Aside from that, there is no theoretical limit to the size of NdFeB that can be magnetized. There are many practical limitations, such as safety (handling issues), coil size, cooling concerns, available energy from capacitors, etc.

The only practical way to manufacture a 1 cubic foot magnet is to assemble from smaller blocks. With the appropriate fixturing and adhesive, this is a fairly straightforward process.

 

[Order]

So simply combining the smaller magnets into the desired shape will yield the strength of a single magnet of that size or at least very close to it?

 

[MagMike]

Yes, in the case of NdFeB magnets (as well as SmCo & Hard Ferrite) the performance will be very close to one, solid magnet.

 

[nbucska]

I have seen a patent for assembling large magnet from pieces for travelingwave tubes.


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