Tesla's "COIL FOR ELECTRO-MAGNETS".

[synchro1]

Beam me up Yoda!

[hoptoad]

snip....
In this patent linked below. Tesla clearly says that an alternator can be used to energize the primary. The words are crystal clear. As far as I know alternators produce continuous sine waves.
http://www.google.com/patents?id=oSo_AAAAEBAJ&printsec=abstract&zoom=4#v=onepage&q&f=false
Page 2 line 62 to 69
So there is another misconception, Tesla did say an appropriate alternating dynamo can be used, as he did use many times.
snip....

A transformer output inverter connected to a DC supply, particularly a transformer output inverter with variable fequency capability, would also probably suffice as the primary coil supply source.
Cheers

[Farmhand]

Yeah I hear ya MileHigh, To tell the truth I haven't found or envisioned any fantastic uses for it myself either, but for me that isn't important. I don't mind others arguing the point about it's uses. And I might even hint at possible uses just because of conceptual thinking, but that's just me, I suppose things and I try to make it clear when I do so that they are suppositions. But to answer your question, I don't know what it would be useful for except as an example of the effect. The fact he chose to use a spiral coil form in the patent drawing is irrelevant except that a spiral shows the winding in two dimensions very well. The patent is not restricted to spiral coils as Tesla points out early in the patent as well as noting that in every coil exists these properties to differing values. We know that in the Colorado Springs Notes Tesla explains the drawbacks of distributed capacitance in the HF oscillator. For that reason I can't see the coil being designed for HF, because the movement of electricity is restricted or retarded because of the capacitance "holding" energy within the coil, when he wants it to move from the top to the bottom at great rates.

Could such a coil be used as a capacitive top load for a Tesla coil in place of a toroid or in combination with a reasonable sized toroid or sphere to substantially increase it's capacity if tuned so that at the oscillating frequency of the resonator matched the oscillating frequency of the serial connected spiral coil ? A cap coil as some have called it.

Could it be used in an induction cooker so that the ferrite strips we sometimes see was not needed to increase the inductance to lower the effective frequency, if you can gather what I mean to save me some rambling ? Somehow I don't think it would be suitable for that.

It could be used as a filter as you say, I guess. I have one that works as a frisbee but I can't tell if it generates while flying.  Kidding sorry.

One thing I think it would work well for is low frequency boost converter type operations with higher voltage inputs, as long as the coil discharges all of the energy if the coil can store more energy and take in current quicker as a result of the frequency of the currents into it then I see no reason why it might not be useful in that way.

However I did do a very rudimentary test with serial connecting my coils on the pulse motor ( I never intended to ) but I tried it and the inductance was too much for the setup and what I wanted so it didn't help me in that situation nor did I really expect it to. I like to use multiple windings in parallel of thinner wire because 1 mm wire is not so easy to work with and comes on short length rolls for me and I like low DC resistance if possible and applicable. To keep both strands the same length I usually wind the m side by side if I can keep it up.

Your question is a valid question no doubt about it. I have no solid answer.

Cheers

[Farmhand]

A transformer output inverter connected to a DC supply, particularly a transformer output inverter with variable fequency capability, would also probably suffice as the primary coil supply source.
Cheers

Yes I agree, in low power testing a function generator works well to give the Tesla coil a continuous wave "wave form". The problem comes trying to use an alternator or inverter transformer on a low resistance low inductance primary of only a few turns, I had some success with using an inverter to provide an AC excitement via series capacitors and static spark gaps, it worked but was hell on the inverter circuit when tuning was off or the coil was too close to the IC and circuit. And it wasn't an alternator working at the frequency of the resonating coil either (only remote harmonics) which makes it beside the point, but without the series capacitor primary circuit the primary shorts out the transformer, which is not very good. There are ways around it but I like the DC resonant charging circuit type primary circuit for the way the supply can't be shorted proper. For medium power and voltage inputs solid state rules the roost. And I like the idea of Valves for a continuous wave Tesla transformer to conduct HF experiments. Spark gap coils and Damped wave transformers are for spark gap transmitters and spark making coils in my opinion. For many experiments a continuous wave transformer would be best I think. Every cycle input. I think some solid state setups use primary coupling transformers don't they ?

Cheers

[synchro1]

Cook's patent:

http://my.voyager.net/~jrrandall/CookCoil.htm


Here's a quote from Danial McFarland Cook's battery patent. The last line reads:


"The alternate changes of the iron cores or magnets may be used for producing electro-magnetic motion, or motion to a wheel of any suitable device".


Cook was "Impulse Magnetizing" his ferrite cores with two SBC's in series. "If, now, the circuit is broken the current instantly ceases"....

                "The mode of producing or starting the action in the helices consists in the use of a steel or electromagnet, or a helix, around one of the helices, and causing a secondary current in the enclosed helix by means of a battery current in the outer one; the action then in either the simple or compound helices increases in quantity to the maximum capacity of the wires to conduct with the existing tension of the current. If, now, the circuit is broken the current instantly ceases, and can only be restored by the same means that it was first produced; hence to allow the use of the main circuit for common purposes I introduce a rheostat or resistance of any kind into the circuit, so that a small portion of the current only will flow along the resistance, by which means the action in the helices is feebly maintained when the main circuit is broken, and instantly restored when it is closed to its full force. By this means the action becomes in effect the same as the common battery currents, and may be used for similar purposes. For the purpose of preventing the heating of the helices caused by the intensity of the action, and to prevent circulation of the initial secondary currents in the main circuit, a rheostat of any convenient form may be made to constitute a part of the main circuit D. The alternate changes of the iron cores or magnets may be used for producing electro-magnetic motion, or motion to a wheel of any suitable device".


How enormously important this is! Cook maintains that permanently magnetizing the SBC cores alternatingly, can produce motion in a wheel. This is my "Lenz Delay Theory"! Lorentz propulsion.


All the electrons spin in the same direction but for how long? Can ferrite cores draw on the extra strength of permanent magnetization for brief periods? What really happens to the core when we short these types of "Magnetizer" output coils in our pulse motors?