[GreenKeys] M28 selector magnet wiring

[ad7i]

I think it's wired this way in order to make one pole N and the other S,
like a horseshoe magnet.

Paul, ad7i


On Thu, Dec 24, 2020 at 2:55 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
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
> https://teletype.net/gksearch
> >>> 2002-to-present greenkeys archive:
> http://mailman.qth.net/pipermail/greenkeys/
> >>> 1998-to-2001 greenkeys archive:
> http://mailman.qth.net/archive/greenkeys/greenkeys.html
> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> http://comcents.com/tty/greenkeyssearch.html
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to ad7i at ad7i.net
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20201224/d7fe40f9/attachment.html>