Body
OleThank you for your excellent input.
I found it very understandable, and helpful, concerning a topic that has caused me a lot of trouble building working devices.My ultra fine wire coil trying an Ismael launch was a dud when I tried it a few years ago. Now reading your simple explanation, I now know why it behaved just as it did. Too many turns of too fine of wire just couldn't deliver the type of power we were looking for. It was just that simple.Cheers Warren
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On Sun, 23 Sep 2018 at 7:22 PM, [email protected] [EVGRAY]<[email protected]> wrote:
Hi Mick, Norman,
The magnetic field is given by the current which is the total current going around the core or area where the magnetic field is made. Say a magnetic field in an air core (i.e. no saturation possible as air is a linear medium) is made by having 100A goring around the core. This can be done by having a thick wire of one turn capable of conducting 100A or a thin wire of 100 turns capable of conducting 1A. Both examples give the same magnetic field strength. If the wires aren't superconductors they have resistance. The more resistance the higher tension (voltage) is needed to push (or pull) the current through the wire. If both wires are allowed to dissipate the same amount of heat the 100 turns wire is only about 1/100th the cross sectional area of the thick wire of one turn. Thus the thin wire has about 100 times greater resistance per turn and thus requires one hundred times greater voltage to give the 1A current in the 100 turns of wire. I.e. the resistance is 100 x 100 = 10000 times greater than the one turn wire.
The above example only holds for steady state DC as the inductance of the two coils differs by the turns ratio squared (100^2 = 10000). Thus the 100 turns coil has 10000 times greater inductance than the coil of a single turn. This gives high inductive reactance (high impedance) to HF AC signals or during the transient period of switching on or off a DC signal. The magnetic energy stored is the same for the two coils. The inductive kickback gives different voltages when disrupting the currents into a load. If the load resistance (R) is 1 Ohm the induced voltage (V) of the one turn coil 'discharging' 100A into that load is 100V peak (V = I x R) while the 100 turns coil of 1A will induce only 1A x 1ohm = 1V. To dissipate the same stored energy the coil of 100 turns thus will be much slower to 'empty' its magnetic field than the one turn coil. Putting a load of greater resistance dissipates the stored energy faster as the current must decline from the 1A is has (or whatever value) when starting to remove the magnetic field energy. This is why an electromagnetic relay opens faster with a resistive snubber than when using a simple diode snubber and just the resistance of the coil itself.
https://wiki2.org/en/Maxwell's_equations#Amp%C3%A8re's_law_with_Maxwell's_addition
https://wiki2.org/en/Amp%C3%A8re's_circuital_law
Regards
Ole
---In [email protected], <nwootan@...> wrote :
https://en.m.wikipedia.org/wiki/Electromagnet
Read this then we can discuss the use of fine wire/ high voltages/ moderate current. We will have to get Ole involved here for now we are talking about watts driving coil vs shear current over large wire sizes.
Explosively pumped flux compressionEdit
Main article: Explosively pumped flux compression generator A hollow tube type of explosively pumped flux compression generator.
The factor limiting the strength of electromagnets is the inability to dissipate the enormous waste heat, so more powerful fields, up to 100 T,[23] have been obtained from resistive magnets by sending brief pulses of high current through them; the inactive period after each pulse allows the heat produced during the pulse to be removed, before the next pulse. The most powerful manmade magnetic fields[26] have been created by using explosives to compress the magnetic field inside an electromagnet as it is pulsed; these are called explosively pumped flux compression generators. The implosion compresses the magnetic field to values of around 1000 T[24] for a few microseconds. While this method may seem very destructive, it is possible to redirect the brunt of the blast radially outwards so that neither the experiment nor the magnetic structure are harmed. These devices are known as destructive pulsed electromagnets.[27] They are used in physics and materials science research to study the properties of materials at high magnetic fields.
On 9/23/2018 4:18 PM, James Glinski jglinski01@... [EVGRAY] wrote:
mNorm
Is there a reference some were to wire size and wire turns to magnetic flux field intensity ...I've all ways concidered that more turns greater magnetic strength .but what about very fine wire at hi voltage pluse with many more windings .shifting from current to voltage to accommodate the fine wire .with many more windings there should be greater field intensity ..this is all about turning off a toroidal core attraction with magnetic flux .with the least power . for a orbo type motor .every one I've seen uses thick wire .and even with that there claim is over unity but if your were to use a Hi voltage larger toroidal core with larger neo's that may shift even further into OU .thinks norm .
Norman
Now I know you are playing with us. As I sit in the corner of my basement, wearing my aluminium foil hat, hoping that neutrinos won't pass through me, it is hard to believe this loose collection of atoms is so transparent. It is like we are no more tangible, than a television image in space. Or a character in some computer game. The implications of the dynamic qualities of reality could make our hermit on the mountain's head hurt. I'll stick to trying to blend a perfect consistancy of Heritage mix mortar, to fill the voids between the rubblestone walls of my new studio /work shop. The original mix only lasted150+ years. I am hoping for better performance, in spite of those pesky neutrinos. Should the new doors be pine, oak, or hickory? There is also quite a surplus of perfectly sound, I believe, tamarack, poles, about ten inches in diameter. They are so hard, and dense, that even a new chainsaw blade smokes with the effort of cutting. The carbide sawsall blades are the only way, so far. They also may be contenders for new doors. They came out of the old milking dairy part of the big barn. This whole moving task has been a crazy amount of work this last year. I can't wait to get back to building energy devices. My friend Mike is hooking up his household solar bank to the electric hot water tank directly to do a test, at my pestering with a concept. Forget batteries, just heat water? Energy storage? Cheers Warren
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On Sun, 23 Sep 2018 at 10:10 AM, Norman Wootan nwootan@... [EVGRAY] <[email protected]> wrote: http://timeblimp.com/?page_id= 1033
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