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Re: SPDT Snon-rotarySG

Hi Bryan,

	This is an interesting idea.  I wonder if you would be able to get the
armature to move far enough.  I would "think" it would have to travel about
and inch to be able to do the task.  If it is not to much trouble, I would
recomend playing with this idea.  Before it really works, I am sure it
would require a lot of sweat and all.  However, if you could perfect the
thing it would be a "big deal".  If you were to put it in a hard vacuum
with tungsten contacts that could clear by a very small distance or
something like that, the high voltage would not be such a big deal...

If you have two contacts that the armature would go between, the armature
itself would not have to carry current.  It would just "trigger" the gap.
that may be an advantage too.

You could probably play some LC circuit games with the input voltage to the
coil to adjust the dwell angle.

Interesting idea...

Cheers,

	Terry

At 10:23 PM 01/01/2000 -0800, you wrote:
>Hello Everyone
>I have been thinking of a possible subsitute to a SRSG that would not
>require a sync motor.  I would like to know if there are any flaws that I
>have missed.
>
>My idea is to have a metal armature, which would be one side of the gap,
>that vibrates between two contacts which are shorted together, which make
>the other side of the gap.  The armature is weighted so its natural
>frequency is a multiple of 60(or 50)hz.  A magnet would be placed near
>the bottom(or just a lump of ferrous material) with a coil next to it. 
>The coil would be powered by the mains supply and draw only a few watts. 
>If all goes as it is supposed, the coil would pump the armature until it
>is in full swing, where it would get close to one contact, cause the gap
>to fire and then swing towards the other contact causing the gap to fire
>again.  The firing of the gap would be locked in sync just like a
>rotating gap.  Technically I could do it with only one contact but having
>two gives 50% duty cycle to let them cool down.  Or more than two
>contacts could be used by placing the additionals above the armature. 
>Would I be able to adjust the natural frequency of the armature close
>enough to the 60hz multiple?  Or is it not worth the hassle and I should
>just go to the junk store and spend $10 on a fist sized 1800 rpm already
>sync-ed motor?
>
>Bryan
>