I only use AC motors, as they are usually quieter and can provide decent
torque, I connect the motors to the driver shaft on the lower roller using
plastic tubing so the joint is flexible and has some give. Lastly I always
use high-quality skate bearings to hold the shafts, and make all cuts/holes
super precise with dill-press and lots of measure 10 times cut once =)
IT depends on the motor speed too, you don't need an incredibly high speed
motor in fact that last built would stop working after a second of running
because the belt was too loose and throwing off the rollers. I tested it
with a slower quieter AC fan from a stand-up fan and it worked fine, and
was virtually silent.
I shortened my belt and went back to the existing motor - I got two from
ax-man at $3 a piece as I intend to build another one of these at negative
charge to make a dual pole version.
On my 6foot model the motor was incredibly fast and did sound very, by much
quieter than an equivalent DC motor.
I still struggle with vast amounts of charge-leak from these smaller units
so I'm working on that issue now (have to radius the bowl opening).
Matt
On Fri, Aug 28, 2015 at 5:05 AM, Troy <teslatroy@xxxxxxxxxxxx> wrote:
> That's a very nice VDG. Mind if I ask what motor you're using? It's
> incredibly quiet. I've built quite a few VDGs and they all sound like jets
> taking off while they are running... even my smallest one using a 12 dc
> hobby motor...
>
> Cheers,
> Troy.
>
>
> On 27/08/15 04:54, Matthew Sweeney wrote:
>
>> I built this little one today using an existing collector and a new motor.
>>
>> I removed the corona ring and taped an aluminum static shield outside the
>> main tube about 1/2 inch from opening and 1 inch wide. It didn't stop the
>> butt leakage but for some reason it helped overall. Maybe I just suck with
>> corona rings or field formation to metal drive components.
>>
>> I show a few videos one for longer discharges and other close up. Sure its
>> no Tesla coil but it puts out good charge rate (besides leakage) and not
>> bad for such a simple device.
>>
>> https://youtu.be/KM05idNLUAU
>>
>> https://youtu.be/sgLfUq_McWY
>>
>> Now how to deal with the bottom leakage? Grrrrr!
>>
>> Matt
>> _______________________________________________
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>> Tesla@xxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>>
>>
>>
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