How fast does your motor spin Brian? IF you can get your BPS range of the
spark gap in the 700+ ish range, you should be able to run ASYNC on an NST.
You just need to use a really tiny tank cap to compensate. Really tiny...
Like 1/10 of resonate cap value... Don't let it drop anywhere below say
500 though, or you risk seriously killing your NST. Try at your own risk
of course, but I'm pretty sure its been done before (pretty sure, but not
positive...)
Scott Bogard.
On Wed, Sep 17, 2014 at 9:37 PM, Dave Boyle <teslaFirma@xxxxxxxxx> wrote:
> The motor is a 3 phase 208v 1/2 horse driven by a vfd. Does it make sense
> to grind flats on it's armature?
>
>
>
> On 09/17/2014 08:50 PM, David Speck wrote:
>
>> Dave,
>>
>> "Pretty close" is not good enough. When your gap drifts far enough away
>> from optimum synchronization, the NST will fail permanently.
>>
>> Look at the old posts that describe how to file flats on a motor armature
>> to convert it to a fully synchronous motor. Then, you can use a Freau
>> phase adjuster to precisely set the phase angle of the motor without having
>> to mechanically rotate the motor body.
>>
>> (Another) Dave
>>
>> On 9/17/2014 7:12 PM, Dave Boyle wrote:
>>
>>> Oh now you tell me! Hey what about if I operate my spark gap motor in
>>> the synchronous zone? At 1 or 2 beats per cycle with the nst switched off
>>> while the motor changes speeds? I have an led strobe synced to the ac line
>>> light that I use to see when the disc is at the right position. I can't get
>>> a phase lock but I can keep it pretty close. Maybe I should build a custom
>>> inverter that will run the motor at only those speeds that are safe.
>>>
>>
>> _______________________________________________
>> Tesla mailing list
>> Tesla@xxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>>
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla