Re: Metal Rotor = Isolated Motor?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Greg,

It's a good idea to isolate the conducting portion of the gap from the
rotor shaft. If it's a metal disk
attached to the shaft, I would expect it's just a matter of time before the
motor fails. The bearings are
an obvious area for arcing and pitting since they provide a path from rotor
to gound, but the stator
windings could also be damaged given the right transient condition. Who
knows, it may run ok for quite a
while, but it's still a risk to the motor. Isolation "is" necessary to
prevent the risk of damage.

Barton B. Anderson

Tesla list wrote:

> Original poster: "Gregory Hunter by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>
>
> Dear List,
>
> After corresponding a bit with Jason Johnson regarding
> his MOT coil with RSG, I have a question:  If one uses
> a metal rotor on an RSG, is isolation of the motor (or
> the rotor) required?  I'm asking because I assumed
> isolation was neccessary, but Jason tells me his RSG
> motor isn't isolated. Why doesn't the 4KVAC instantly
> fry his RSG motor?
>
> Regards,
>
> Greg
> http://hot-streamer-dot-com/greg
>
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