Talk:Saturation (magnetic)

Redirects

—DIV (128.250.80.15 (talk) 01:44, 20 May 2008 (UTC))[reply]

Why have these redirects been removed? It took me ages to realise that there actually was an article on saturation magnetisation on Wikipedia, because I didn't think it would be named like this. --Freedo50 (talk) 21:38, 26 August 2009 (UTC)[reply]

Permeability

In chapter "Introduction" the following sentence should be changed:

"The relation between the magnetizing field H and the magnetic field B can also be expressed as the magnetic permeability: μ = B / H. The permeability of ferromagnetic materials is not constant, but depends on H. In saturable materials the permeability increases with H to a maximum, then as it approaches saturation inverts and decreases toward zero.[2]"

Of course the permeability decreases towards one, (even though it requires infinite field strength to go there)... 21:16, 17 October 2011 (UTC) // Jan — Preceding unsigned comment added by Ssfja (talk • contribs)

I wrote that. You're right, of course. If it was just ferromagnetism, the magnetization would approach a maximum, but because of the paramagnetic response of the unpaired electrons, the magnetization keeps increasing with the H field. Thanks for the correction. --Chetvorno^TALK 02:36, 18 October 2011 (UTC)[reply]

That business about reaching a maximum is probably referring to the susceptibility. The permeability just increases monotonically. I have corrected that, as well as the limiting value. RockMagnetist (talk) 02:57, 18 October 2011 (UTC)[reply]

No. The permeability is the slope (B/H) of the line from the origin to a point on the magnetization (hysteresis) curve. At low H fields the curve curves upward, so permeability increases. It reaches a max near the knee of the magnetization curve. In saturation the curve becomes almost flat and B is almost constant, so increasing H causes B/H to decrease. (Bakshi, fig. 3-37) --Chetvorno^TALK 05:52, 18 October 2011 (UTC)[reply]

Fair enough. I'm not used to this particular usage. However, the limit should still be

μ 0

in SI units. Bozorth probably uses Gaussian. RockMagnetist (talk) 06:25, 18 October 2011 (UTC)[reply]

Magnetization curves of 9 ferromagnetic materials, showing saturation.

That graph -- are the materials in the correct order? Sheet steel saturating at 1.6, Cobalt around 0.4? I would think the red line is the best material, and the gray line the worst? Drmemory (talk) 17:16, 7 May 2012 (UTC)[reply]

I checked the source here (see also the table on pp 88-89 and note that the numbering in Fig. 42 is not the same). Perhaps the real problem is that this source is so old - published in 1917! RockMagnetist (talk) 17:40, 7 May 2012 (UTC)[reply]

Saturation Current

I searched for "Saturation current", and got a story about diodes. The I think the saturation section here needs expanded or else a separate article on "Saturation current (magnetic)". I also propose that "Saturation current" be changed to "Saturation current (diode)" and a disambiguation added pointing to both.

I will leave a similar note on "Saturation current" talk. Comments? :- ) Don 15:17, 9 May 2012 (UTC)[reply]

I'm not familiar with a magnetic interpretation of Saturation current. Can you point me to a reference? RockMagnetist (talk) 15:40, 9 May 2012 (UTC)[reply]

Me neither. --Chetvorno^TALK 16:01, 9 May 2012 (UTC)[reply]

Sorry, talk page slipped past me, and you can never find a good example when you want one. Dealing with transformers and inductors, it is important to know the saturation current, because if you exceed it, they stop behaving nicely. I was looking for a way to calculate it, or how it is calculated by manufacturers. Here is a Bourns data sheet with Isat listed as parameter: [1] :- ) Don 03:13, 17 July 2012 (UTC)[reply]

Cool! Now Wiki, how do I calculate or determine the saturation current when not given? :- ) Don 02:10, 18 July 2012 (UTC)[reply]

Not so hard if you have the right equipment: [2] :- ) Don 02:31, 18 July 2012 (UTC)[reply]

Magnetic reluctivity relationship

Another term common to magnetic saturation is the so-called magnetic reluctivity relationship. The polarization (intrinsic or ferric induction) approaches a saturation value and not the induction B. An online reference: http://nvlpubs.nist.gov/nistpubs/ScientificPapers/nbsscientificpaper546vol21p743_A2b.pdf

Would it be appropriate to add this principle as well as the procedure to extrapolate to the saturation polarization to this article? — Preceding unsigned comment added by Pikkedil (talk • contribs) 07:09, 8 July 2015 (UTC)[reply]