Tesla Coil Phase Control SRSG using a John Fraeu controller.

www.hvtesla.com 200bps 50Hz 1500 rpm

The spikes are from the photo electric cell being triggered by the revolving electrodes. The reference sine wave is from a 10v ac supply on the second channel.
In the opening shots you can see a complete cycle of the mains with the 4 firings 90 degrees apart, a firing occurring every 5ms. At the 41second point in the video, I expand the scale so the scopes vertical divisions are now 1ms apart which is 18 degrees (90/5) so you can see the fine control.

The Variac is a 0 to 270v and a single 1ms movement on the scope, or 18 degrees of phase, corresponds to 0 to 60v on the Variac scale. So about 81 degrees total movement possible. Ideally I should have 90 degrees.

The trigger trace is a bit jittery on the scope due, I think (hope?), to the fact that the photo electric cell was picking up vibration from the motor, as it is all on a wooden floor.

Cap value for the phase controller is 34uF giving a 15v resonant rise at one point (around 120v mark on the Variac scale)

Category:

Science & Technology

Tags:

• SRSG
• Tesla
• HV