[GreenKeys] Magnet Spice Model

[Bob Camp]

Hi

Well the whole incremental inductance thing is what's next on the to do 
list here. If I can get this darn kitchen sink project done I'll take a 
stab at it Monday .....I have a nasty suspicion that Teletype used 
saturation as one of the ways to tolerate a wide range of loop 
currents. If you needed say 15 ma to saturate a 20 ma magnet then 
having a 10 or 20 percent swing in loop current would have almost no 
affect on the operation of the machine.

I'm in the same boat on 88 mHy loading coils. I filled up a couple 
dozen pages in a log book on all sorts of useful data about them back 
in 1972. I can't even remember the first page ...

	Take Care!

		Bob Camp

On May 30, 2004, at 5:09 PM, jhhaynes at earthlink.net wrote:

> Of course the situation is complicated because the inductance changes
> as the armature moves.  Not to mention core saturation.  I remember
> testing some selector magnets at Teletype with an instrument called
> an incremental inductance bridge.  Basically it let you run DC through
> the winding so you could measure the inductance at various levels of
> DC current.  But I don't remember the results.
>
> -- 
>
> jhhaynes at earthlink dot net
>
>
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