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Ferromagnetic core modeling.

 

On Sun, Dec 22, 2024 at 05:16 PM, Richard Andrews wrote:
I am reading here. "A is the bead magnetic cross section in square meters, use dimensions C*(A-B)/2, area is in mm2 hence the u".
 
 
So, is the area in meters, micrometers, or millimeters?
Neither.  Square meters, or meters squared.
 
See your LTspice Help page for Inductors:
 
A = Cross sectional area, Units = meter**2 (meters squared).
 
If even says so in the text you quoted from the LTwiki: "A is the bead magnetic cross section in square meters".
 
Fair-Rite's datasheet uses millimeter dimensions so needs to be converted to meters.  Computing C*(A-B)/2 to get area in meters^2 means adding a 'u' multiplier to the computed area when using Fair-Rite's datasheet dimensions.  (Note that the "A" dimension on Fair-Rite's datasheet is not the "A" parameter in the Chan model.  You probably knew this already.)
 
Andy
 
 

On 23/12/2024 00:18, John Woodgate wrote:
You can usually write 'µ' in email and elsewhere using ALT-0181 on the numeric keypad.
If you use Thunderbird as your email client, there are a number of characters and symbols you can add from the menu item: Insert > Characters and Symbols > Common Symbols. The drop-down list contains "µ".

For those not listed, there is Character Map.

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Regards,
Tony
 

vOn Mon, Dec 23, 2024 at 04:06 AM, Tony Casey wrote:
For those not listed, there is Character Map.
But again, that's Windows.
 
And anyway, I might be wrong but I thought Windows dropped the Character Map tool, another one of its dumb ideas.  I saved my copy so I can still use it.
 
Personally, I don't mind when I see "u", which was in the LTwiki.  LTspice lets us use "µ" but sometimes that gets us into trouble.  That happened a lot in this group when it was on Yahoo!Groups due to its online editor.  I think Helmut changed his LTspice settings to not use "µ", to avoid that problem.
 
Andy
 
 

I wrote:
And anyway, I might be wrong but I thought Windows dropped the Character Map tool, another one of its dumb ideas.
The "dumb idea" was the decision to drop the tool, not the tool itself.  Sorry for any misunderstanding.
 
Andy
 
 




On 23/12/2024 14:30, Andy I via groups.io wrote:
vOn Mon, Dec 23, 2024 at 04:06 AM, Tony Casey wrote:
For those not listed, there is Character Map.
But again, that's Windows.
 
And anyway, I might be wrong but I thought Windows dropped the Character Map tool, another one of its dumb ideas.  I saved my copy so I can still use it.
you are wrong...
.. well I have "Mapa de Caracteres" on this Windows/11 laptop, but I see its an optional add-in. I use it from time to times as laptop does not have a numeric pad so to type directly  you have to use the on-screen keyboard.

 
Personally, I don't mind when I see "u", which was in the LTwiki.  LTspice lets us use "µ" but sometimes that gets us into trouble.  That happened a lot in this group when it was on Yahoo!Groups due to its online editor.  I think Helmut changed his LTspice settings to not use "µ", to avoid that problem.
 

Andy
 
Dave
_
 

On Sun, Dec 22, 2024 at 10:19 PM, Andy I wrote:
(Note that the "A" dimension on Fair-Rite's datasheet is not the "A" parameter in the Chan model.  You probably knew this already.)
No, Andy I haven't gotten that fare yet. I am still studying Alexanders files. Thanks for the "heads-up".
 

On Mon, Dec 23, 2024 at 03:34 PM, Andy I wrote:
I wrote:
And anyway, I might be wrong but I thought Windows dropped the Character Map tool, another one of its dumb ideas.
The "dumb idea" was the decision to drop the tool, not the tool itself.  Sorry for any misunderstanding.
 
Andy
 
You are right, dropping Character Map would be a dumb idea. When I still used Windows years ago, it was a useful tool to me. I used it often to copy/insert non-standard chars into documents. Change for the sake of change is the dumbest idea ever, in my opinion.
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Regards,
Abes

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