synchronous gap (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- 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