re-magnetising permanent magnet alternator

[Zoidberg]

I need to re-magnetise a small turbo-alternator(steam).

Unit output is 600W 32VAC. Machine is brushless, 2 pole permanent magnet with claw rotor. Rotor has been removed, and as such machine requires re-magnetising.

Presumably this can be achieved via electromagnet, but need to have some idea of flux densities required, orientation of electromagnet etc..

cheers

 

[labgeek]

Cheaper and easier to replace the whole thing!
Re-magnetizing requires expensive setup and equipment.
Good for many units.......expensive for single unit.
Recommend buying new alternator.

 

[UKpete]

I agree with labgeek. Incidentally, it is only the old cast magnets such as Alnico that demagnetize when you disassemble without a keeper; ferrite and rare earth (samarium-cobalt or neodymium-iron-boron) do not require a keeper. It is very difficult to demagnetize them except by taking them either to a very high temperature or subjecting them to very strong demagnetizing fields. For the same reason, they require very strong fields to magnetize them.

You may know that already, but I mention it just in case.

 

[jbartos]

Suggestion: Try to contact the manufacturer tech support.