[GreenKeys] Magnet Spice Model

[jhhaynes at earthlink.net]

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.

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jhhaynes at earthlink dot net