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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
I've seen a number of SRSGs with varying RPM: 900, 1800, 3600. All, of course, are multiples of 60. The breaks per second are determined by the number of electrodes. How do you determine the best Breaks-per-second for your coils? For example, if I have an 1800 rpm (30 rps) motor how do I know if 120 bps, 180 or 240 is the best?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
It depends on what you mean by "Best." 120bps is always "Best" in that it gives the longest sparks per watt of input power. The higher BPSs can be "Better" if you want a more spectacular display, since they give brighter, thicker sparks at the cost of a smaller spark length per watt.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
You can also have variable frequency drive or even a DC or series motor for variable speeds. We are using a DC permanant magnet motor for our coil because it was available. That with the controller gives very tight speed regulation.
Our major issue right now is that I don't know if the rotor will be synchronized or not, so we're going to strobe tach it against the line frequency to make sure.
A small RSGC can be made with a sewing machine motor, and will give you a lot of variance depending on what voltage is fed to the motor. I did this for my prototype but I don't recommend it because I had a lot of problems keeping it at the speed I wanted.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
So if I have a flywheel/electrodes spinning such that I have 120 bps, how do I know that they are breaking at the correct point on the sinewave? The breaks can be occuring at the bottom, middle or top; they will just be evenly spaced.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
Could this work:
If one has a flywheel that provides 120 bps, could the "stationary" contacts be allowed to pivot from 0 to 90 degrees. This way one could physically change the point in space and therefore the point in time for the break.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
If all you want to do is be able to vary the phase with the line there are very simple circuits that let you create a phase difference with the line... I would say that that would be easier to use then moving the contact around.
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synchronous rotary gaps
