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Re: Rotary Arc Gaps
Hi Harvey,
The gap should fire just as the voltage in the tank capacitor reaches the
maxiumum voltage on the AC cyclce. There are some resonant and dynamic
effects that make this point occure latter than one would think if the
charging circuit is resonant as in many neon systems.
The short to the poser supply is handled though chokes or current limits
in the transformers depending on what type of system it is.
My neon system uses a 120BPS sync gap. This is what it is designed for
and the neon transformer just barely charges the cap to full voltage at
this rate. However, if one has a pole pig system that can charge the cap
very quickly, you can go to higher break rates since the pig can charge the
cap many times during an AC cycle. Thus the very high break rates...
There are sync motors around for not too much money or you can convert a
regualar AC motor. I have never done this so I'll leave it to others to
explain or check the archives.
Terry
At 09:31 PM 2/16/99 PST, you wrote:
>I have several questions regarding rotary arc gaps. Is not its purpose to be
>able to allow for the short on the arc gap contained in the tank LC primary
>to be timed so that this occurs precisely when the AC voltage input is near
>zero, thus negating the problem of the arc representing a short to the power
>supply? If such is the case this would be 120 shorts per second based on 60
>hz. Why do some designs than use 720 bps which I assume must mean 720 bursts
>or shorts per second? Also can I expect to pay around $500 just for a
>synchonius motor to make a Rot. arc gap? I assume this must be purchased.
>Are dc motors also used with many poles or shorts per revolution to
>circumvent this cost? Thanx for any info. HDN
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