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Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
I have a question about the voltage difference between each winding of a secondary coil.
I know that the phrase "quarter wave resonator" is used to describe a secondary coil. This models the secondary coil's voltage with the first 90 degrees of a sine wave. The peak of the sine wave (90 degrees) represents the top of the secondary, and a sine wave at 0 degrees represents the bottom of the secondary, (no voltage to ground.)
I started thinking about this some more, and it occurred to me that the voltage between each secondary winding is not the same anywhere along the length of the secondary.
The voltage between the very first two secondary windings would be the greatest, (this is where a sine wave has a really positive slope) and the voltage between the top two secondary windings would be very very small. (the sine wave peaks out and starts to go horizontal)
Thats correct right?
Also, why doesn't arcing ever occur between the windings of a secondary coil. Shouldn't there somewhere around 500 volts between each winding near a bottom of a secondary coil. The enamel can hold that off from arcing?
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
All seems correct to me. At least for the case when the secondary is bare, without a toroid connected to the top.
When a toroid (top hat) is connected to the top of the resonator, that modifies the current distribution in the winding. Without the toroid on the top, the current distribution is high current at the bottom, decreasing to no current at the top, (because it has nowhere to go.) Adding the toroid puts a lot of lumped capacitance at the top of the resonator so there is now somewhere for the current to go. This evens out the current distribution along the tesla secondary, and I think that it will make the voltage distribution more linear too.
As for arcing between windings of the secondary coil, it can and frequently does happen. If you haven't observed it, then you haven't pushed the secondary to it's limit of power and coupling. Arcing often happens towards the bottom of the secondary because there is transformer action here from coupling with the primary, and as you said the voltage gradient in the resonator may be naturally highest here also.
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1/4 wave resonant
