Re: SRSG's

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

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

Hi John, All,

Very good. That's quite a lot more phase adjustment than I would ever have
suspected.  I don't think we would require more than 45 degrees of phase
shift at
most. A 1/2 cycle should be enough to direct or adjust the gap conduction
for the
greatest power curve for 120bps operation or higher.

Great job!

Bart




Tesla list wrote:

> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<FutureT-at-aol-dot-com>
>
> In a message dated 12/15/00 12:43:04 AM Eastern Standard Time,
> tesla-at-pupman-dot-com writes:
> Bart, all,
>
> I just used trial and error, no calcs.  It still works with half or double
> the capacitance, but with double, there's more resonance occuring,
> and with half, the motor loses lock at the full phase shift.  If one is
> willing to accept a smaller phase shift, the cap can be smaller.
> For a 3600 rpm motor for which full phase adjustment range is
> 180 degrees, I get a 90 degree range of adjustment.  Using an 1800
> rpm motor for which the full range is 90 degrees, I expect the circuit
> will give a 45 degree range of adjustment, not sure though.
>
> Of course the key may be the power of the motor.  A powerful motor
> may tolerate a (relatively) smaller cap (resonance-wise) without
> un-locking (maybe).  It may also tolerate the installation of the
> resistor to de-Q the circuit to stop the resonances that Terry
> is concerned about.
>
> John Freau