Re: [EVGRAY] Sweet spot

Body

Warren,

You may want to limit the voltage going to the variac with some GDT's
and use the excess the charge caps as the spikes from the magneto effect
can cause enough voltage to punch through the varnish on your variac
autoformer.
These devices are not designed for voltages above the dielectric
breakdown which can be a couple thousand volts, not at all hard to reach
specially if switching the little motor through fast speed changes or
switching the output by shorting the coils.  Current capacity may have
little to do with it as it does not sound as if you had a load beyond
the ability of the first autoformer.

On 3/6/2019 6:30 PM, Warren Keillor [email protected]
[EVGRAY] wrote:
>  
>
> Doug
>
> I hope you can see the simple apparatus and arrangement I put together
> to try to find that sweet spot on the rpm range on my other email.
> The rpm was quite high compared to any bicycle wheel speeds, one could
> ever reach.
> I may well of travelled through the correct speed ande not known it
> since I was just doing a machinery check out. In storage, snow had
> gotten into the golden motor and it was seized up, so I had to take it
> apart, clean it, lube it, and put it back together.
> I thought I better check it out today doing a full speed run using a
> little load, a 40 watt incandescent  light bulb, and see how fast it
> could go.
> The range is good but needs a bigger variac, like my 30 amp, that I
> never consider load with, until I have to carry it across the barn
> yard in the snow.
> I have learned my lesson not to be lazy.
> Cheers Warren
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