Re: SRSG options

["R.E.Burnett" <R.E.Burnett-at-xxxxxxxxxxxxxxx> (by way of Terry Fritz <twftesla-at-xxxxxxxxxx>)]

Hi Brad,

You can make a controller of the "Phase Locked Loop" type to sync a DC
motor to the AC line quite easily.  It works great until the HV is turned
on.  The difficult part is making it immune to the RF and transients when
the TC is running some real power.  Otherwise, the motor will loose sync !

It is _MUCH_ easier to machine an induction motor,  and use variac phase
control.  There's less to go wrong.
							Cheers,

							-Richie,

On Wed, 1 Nov 2000, Tesla list wrote:

> Original poster: guido28-at-mediaone-dot-net 
> 
> I was talking to a friend of mine before i started milling flats in my
> motor, and he mentioned another option that may or not work. Actually i
> know it will work, i just don't know if it will operate properly under
> these conditions.  He was talking about using a dc motor to spin the
> disk with 4 electrodes.  On one end of the shaft there will be the disk
> with the electrodes, on the other there will be another disc, smaller,
> and it will trigger a proximity switch.  If you can reference from the
> AC line coming in, you can make a circuit to make the dc motor run in
> sync with the AC phase.  Also we talked about the possibility of making
> a control board which will let you see if it is in phase and also let
> your retard or increase the timing, instead of doing it manually by
> actually moving the motor.  I think this will be an excellent
> alternative because you can control everything from a pannel and not
> even have to shut down the system to adjust the phase of your srsg.  The
> only problem i can see is the strong emf that is created by the coil. 
> Since my gap will be in a cabinet under the coil, i was wondering if the
> actual running of the coil will wreak havok with any parts on the
> control unit.  It is possible to have all control circutis outside of
> the cabinet except for the proximity sensor, which i think will take the
> most abuse if any of the components are going to be affected by the
> emf.  So pretty much my question is,  will a control board hold up so
> near to a coil, or will i have to isolate all of the circuits and use
> fiberoptics to reference where the disk is and how fast it is spinning? 
> I can get all the parts no problem, probobally even for free, but if the
> fiber optics are needed, it will get a bit pricey.......
> Let me know what you think of the idea, even if you are not even sure
> about the effects!
> Thanks a lot!!
> Brad DiGiovine
> 
> 
> 
>