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Re: [TCML] rsg pulsing
The plastic coupling is actually very robust. It has 2 large set screws and
it is precision machined out of 1.25" delrin rod and it is definitely not a
weak spot. As far as the pulsing goes, i think i got everything worked out
with that and i am considering changing it to dc resonant but that will be
next year because i am going back to florida in a couple of days and when i
come back it will be winter. I have other things to work on now such as the
drsstc along with a couple other projects i have planned.
On Fri, Sep 19, 2008 at 9:32 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:
> Hi John,
>
> As Zapp mentioned, the mechanical coupling appears concerning, but I've
> also seen these couplings used in rather large loads in gear style
> applications which couples a gearbox to a motor shaft. So, hopefully, you've
> thought about that and accounted for the disc load.
>
> The pulsing can be mechanical or electrical. As mentioned, there is a great
> deal of cable length from box to box. It wouldn't surprise me if you were
> causing an electrical resonant frequency feeding back to the DC Controller
> mains, and thus pulsing the DC voltage. Any way you can measure the DC
> output with a scope while running? If so, you should be able to track down
> the cause. Seen on DC? if yes, is it on AC mains to the controller? If yes,
> then move input to an unaffected circuit. I doubt a DMM would sample fast
> enough unless the pulse is rather slow.
>
> Take care,
> Bart
>
> Quarkster wrote:
>
>> John -
>> I think the answer to your "pulsing" problem has been adequately answered
>> both here and on the HV list, but I have two additional questions for you:
>> 1. Is the mechanical coupling between the DC motor and the RSG disk
>> fabricated only from plastic (i.e. not a white plastic sleeve over a solid
>> metal coupling)? If the entire coupling is plastic, I'd be very concerned
>> about the mechanical reliability of that much mass, overhung that far
>> without an outboard bearing, and secured only by a few set screws threaded
>> into plastic. 2. It looks like you have literally yards of wiring in your
>> primary circuit, connecting RSG to tank cap, and the actual primary coil is
>> even further out of view. This adds a lot of inductance; did you add this
>> inductance into your primary resonant frequency calculations? Ideally, the
>> tank cap, spark gap, and primary coil are close-coupled to keep
>> intercorrecting wiring as short as possible, measured in inches and not in
>> yards.
>> Regards,
>> Herr Zapp
>>
>>
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