Re: synchronous gap (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 11 Jul 2007 03:30:11 -0700 (PDT)
From: Yurtle Turtle <yurtle_t@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: synchronous gap (fwd)

I'm interested as well, if this thing goes offline.

Adam

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> 
> ---------- Forwarded message ----------
> Date: Tue, 10 Jul 2007 18:10:05 -0700
> From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: synchronous gap (fwd)
> 
> Hi Stephen,
> 
> Although I have run sync, I don't any longer. I'm
> not running a VFD as 
> well. I would be interested in your PLL feedback
> details. My gap is set 
> up now to vary the speed with a simple potentiometer
> (0 to 500 Hz, where 
> the high end is way to fast to actually achieve).
> But it would be a nice 
> addition to sync the motor as well. If you have any
> details on it, I 
> wouldn't mind hearing what you did to accomplish the
> task. Maybe offline 
> would be best.
> 
> Take care,
> Bart
> 
> Tesla list wrote:
> 
> >---------- Forwarded message ----------
> >Date: Tue, 10 Jul 2007 18:44:55 -0700
> >From: Stephen A. Mathieson <sm@xxxxxxxxxx>
> >To: tesla@xxxxxxxxxx
> >Subject: synchronous gap
> >
> >I have yet to run my RSG is synchronous mode but it
> uses a technique you may
> >find interesting.
> >
> > 
> >
> >Regular old induction motors are cheaper and easier
> to obtain. I am using a
> >3 phase induction motor
> >
> >driven by a variable speed AC drive. All you have
> to do to make it
> >synchronous is to put a PLL in the feedback loop.
> >
> >An added benefit is that it allows for the gap to
> fire at whatever point
> >along the sine wave that you wish.
> >
> > 
> >
> >I have a 10 inch disk of �� G10 and I have spun
> it as fast as 7500 RPM with
> >no problems.
> >
> > 
> >
> >The only drawback that I have found so far is that
> the induction motor must
> >be placed outside 
> >
> >the magnetic field generated by the primary coil.
> If the motor is in the
> >primary�s magnetic field the AC drive trips due
> to
> >
> >a current fault as it can no longer keep track of
> the current in the motor.
> >
> > 
> >
> >Good luck,
> >
> > 
> >
> >Stephen Mathieson
> >
> >
> >
> >
> >
> >
> >  
> >
> 
> 
> 
> 



 
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