Re: how deep do the coilers prefer doing it? : )

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Dmitry,

At 11:59 AM 2/25/2006, you wrote:
> Hallo Terry,
>
> Wednesday, February 22, 2006, 10:57:41 PM, you wrote:
>
> > Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
>
> >>the motor was rated for 5a at full load? and it was drawing 4.7a at
> >>idling? % )
>
> > When you cut the rotor down the inductance of the windings drops and
> > it draws more current.
>
> my motor is sync now starting from 180v, and at 220v it draws 0.31a -
> still not 0.35a - i don`t know why, maybe something is really wrong
> here % )

If it works don't worry about it ;-)  Perhaps in the case of my 1800 
RPM motors (four flats on rotor) there is more metal taken off that 
raised the current more.  As John says, one might not have to take 
off all that much metal to make it since too.  I ground mine way down 
like the old instructions said.


> >>btw - do i need some degree of darkness to use a fluorescent bulb as
> >>a strobe? coz i can`t see _any_ pattern
>
> > It is hard to see with fluorescent lights since the phosphore glows
> > on after the current drops.  Neon bulbs are best.
>
> he-he-he - i _can`t_ see anything with fluoro! you need something
> that light up only at say 300v from 310v peak, coz else you would see a
> full sector (or even more) instead of single mark - i`ve learned it
> hard way today : ) neons ARE not much better - i used two thyratrons in
> series, and they start to glow at 212v, so i have to use variac to
> clearly see the mark on 1" diameter "stroboscope disk" : )

Cool!  There are LED circuits too but it gets to the point where 
making a strobe light is too much work to worry about.



> i have a couple of questions regarding motor torque - how much is the
> braking torque when you just plug motor in and it is trying to start
> rotate rsg wheel? is it equal to the moment of inertia of wheel?
> when a wheel is achieved the full sync speed, is braking torque drops
> to zero? then we really don`t need those horse powers.

I "think" it is the torque where the motor starts to dramatically 
loose speed.  As the load on the motor is increased, it starts to 
slip more and more, but there is a sudden point where the speed drops 
off.  Basically the maximum torque the motor can put out before the 
speed falls way off.

Cheers,

        Terry



> -----
> Let the bass kick! =:-D