Hal.
You may recall that the rotor had two discs which were friction linked but
not hard linked. One of them looked like a gear with little teeth. The
pole pieces also had teeth of the same pitch but they didn't touch. When
power was applied the smooth disc got things started running like a shaded
pole motor. As the rotor's teeth passed the stator's teeth the reluctance
of the magnetic circuit was changed and the system wanted these changes to
match the line frequency. Once the toothed rotor locked in the smooth one
just went along for the ride as there was no longer any current being
induced in it. That system was used until battery powered stepping motor
clocks took over.
Regards.
Max. K 4 O D S.
Email: m...@maxsmusicplace.com
Transistor site http://www.funwithtransistors.net
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----- Original Message -----
From: "Hal Murray" <hmur...@megapathdsl.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Saturday, January 09, 2010 4:27 PM
Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits!
p...@phk.freebsd.dk said:
That is what was known as a "synchronous clock". Tom has one running
off his atoms on his web-page...
When I was a kid, I took apart my share of clocks and/or clock radios.
They all had the same basic mechanism. It was a shaded pole motor with a
semi sealed unit that included the first layer of gears. I never took
apart
one of the units. I assume the rotor had a permanent magnet so it would
run
synchronous to the line frequency.
That was 50 years ago.
--
These are my opinions, not necessarily my employer's. I hate spam.
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