LaFonte Group can turn off permanent magnet without work

[LarryC]

Butch and Mark, that is a work of art. Hope it ends up in a museum showing the Lafonte Group Switcher OU breakthru prototypes.

If it is iron, maybe you could you add some calorimetric results to the output.

Regards, Larry

PS: Stefan, thanks for removing wozizi's comment.

[Low-Q]

Can't iron powder cores be used instead of pure iron? We use such cores in crossover networks when making loudspeakers. Those cores does not suffer from eddy currents but have still very high permeability. I can offer a few at no cost except shipping if someone would like to test it.

[gotoluc]

Can't iron powder cores be used instead of pure iron? We use such cores in crossover networks when making loudspeakers. Those cores does not suffer from eddy currents but have still very high permeability. I can offer a few at no cost except shipping if someone would like to test it.

Hi Low-Q, I was also wondering if iron powder could be used for this. I have not experimented with it yet, I just keep hearing about it and that it has next to no eddy currents.

So you been making cores with it. Is it polyester resin you use to hold the Iron powder together?  Have you measured the permeability u value?

Thanks

Luc

[Low-Q]

Hi Low-Q, I was also wondering if iron powder could be A for this. I have not experimented with it yet, I just keep hearing about it and that it has next to no eddy currents.

So you been making cores with it. Is it polyester resin you use to hold the Iron powder together?  Have you measured the permeability u value?

Thanks

Luc

I really don't know what holds the powder together, but there is something none conductive. Our cores are piston shaped, but on some coils we also use a "hat" and a "foot". See these links as reference: http://frequence-shop.dk/upload_dir/shop/025-025.jpg and http://frequence-shop.dk/upload_dir/shop/045.jpg

They are heavy, and rock solid, but are not conductive - infinite resistance.

I dont know the permeability on them, but I will take a 0.47mH air coil and put a core in it and see the difference in inductance - maybe that will tell something.

You will know my findings on monday when I'm back at work.

Vidar

[LarryC]

@Low-Q

Thanks for your kind offer, but I don't know if your jpg shown shapes would help with this replication. But please explain if you know how.

@Bruce-TPU

You have experience with casting iron powder plus nanoparticle cores. Can you help here, with a summary of how you got it done.

Regards, Larry