[GreenKeys] M28 selector magnet wiring

[Tim Swarthout]

See note 5 on 3292WD

Sent from my iPad

> On Dec 24, 2020, at 1:53 PM, Nick England <navy.radio at gmail.com> wrote:
> 
> Steve's recent mail prompts me to write about something ithat has puzzled me at times - 
> The selector magnet assembly contains what look like two identical magnet coils. 
> When wired in parallel, they are connected as follows
> loopA to coil1/terminal1 + coil2/terminal 2
> loopB to coil1/terminal2 + coil2/terminal1
> 
> When in series:
> loopA to terminal1/coil1/terminal2 to terminal2/coil2/terminal1 to loopB
> 
> 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?
> 
> The attached Teletype schematic shows the terminals series connected as I said - note that the windings are in reverse direction for the two coils. I have been confused, because some drawings do show them wound in the same direction.
> Cheers,
> Nick K4NYW a
> (often puzzled and confused, sometimes in parallel, sometimes in series)
> www.navy-radio.com
> <28-magnets-01.jpg>
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