[GreenKeys] M28 selector magnet wiring

[Steve Garrison]

This group can turn on the lights to any problem no matter how obscure!

And it also explains why my 60mA loop on my M28KSR drives the magnets just
fine!

Steve G./N4TTY

-----Original Message-----
From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net>
On Behalf Of Jim Haynes
Sent: Thursday, December 24, 2020 5:15 PM
To: Nick England <navy.radio at gmail.com>
Cc: Greenkeys <greenkeys at mailman.qth.net>
Subject: Re: [GreenKeys] M28 selector magnet wiring

On Thu, 24 Dec 2020, Nick England wrote:

> That is, the magnetic fields are in series through the armature, 
> rather than in parallel attracting the armature.
> N1-S1-armature-N2-S2 (with tops of the magnets linked S2-N1 by the 
> core) Is my thinking correct?
> 
You want the coils in series magnetically because the magnetic circuit is
from one end of the armature, through the U-shaped core through the two
coils, and then to the other end of the armature and through the armature
back to the starting point.  Think of it like a horseshoe magnet attracting
the armature.  If the coils were magnetically in parallel they would have to
attract the armature with the magnetic circuit going through the hinge and
the other metal parts to get back to the far end of the coils.
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