STEORN DEMO LIVE & STREAM in Dublin, December 15th, 10 AM

[mondrasek]

PL, so do your Metglas core samples attract a PM with the same force as a block of steel, less, or more?

[PaulLowrance]

Now I'm confused.  I understood that the higher the permeability, the MORE it takes to saturate it.  I'll go check into it again, maybe I'm wrong.

I can tell you as 100% fact it takes less energy to saturate the core with higher permeability.

Anyhow, the numbers just don't come even remotely close if we consider a normal core. At 2000 permeability it would require close to 1000 turns! At 37 turns per layer, that's ~ 27 layers, lol. It's physically impossible unless all of the other layers are microscopic thin wire.

[PaulLowrance]

PL, so do your Metglas core samples attract a PM with the same force as a block of steel, less, or more?

It depends if the MAGAMP core is saturated. These cores saturate at only 0.57T, while steel saturates at ~ 1.8T. A common ferrite core saturates at only 0.35T to 0.5T.

So if the MAGAMP is not saturated, then it will be more attracted to the magnet than a steel core.

[lumen]

Now I'm confused.  I understood that the higher the permeability, the MORE it takes to saturate it.  I'll go check into it again, maybe I'm wrong.

This is a simple PDF that describes the terms that everyone should be talking in, so everyone understands what is meant when talking permeability.

[mondrasek]

Now I'm confused.  I understood that the higher the permeability, the MORE it takes to saturate it.  I'll go check into it again, maybe I'm wrong.

I think the distinction between PERMEABILITY and RELATIVE PERMEABILITY needs to be made clear. 

Also, I have learned that many documents say Permeability when they really mean Relative Permeability.