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Registered Member #3859
Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179
I am performing some interesting experiments that deal with the physics that is not officially recognized.
1)I am looking for a book that can describe all electromagnetic devices, their type, purpose, effects that are created with them and some mathematics associated with them. Like what toroidal transformers with a cut core are used for or what determines the current a flyback transformer can output on the HV side, besides frequency. There are so many questions.
Specifically I am interested in the magnetic amplifiers and the mathematics and physics that go behind their development. I want to know what king of control power needs to be applied to saturate the core and prevent it from conduction power on the LOAD side of the circuit. There is a specific design that I have in mind.
2) I need to find a self frequency of Q loops and their impedance to a low power signal that is used to excite them. I am not sure what device I should use to test the resonant frequency of the Q loop. Can I use a device that would discharge high voltage through a gas-filled tube and than excite the Q loop through a voltage divider? This way I can use commercially available frequency meters to measure the Q loop resonance frequency.
Is there any good budget way of measuring the resonant frequency of a wide variety of q-loop devices? I would like to know how to design high efficiency q-loops with low impedance and how to determine their bandwidth.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Just a gentle warning. Physics that isn't officially recognised, and 4HV, don't sit well together. There are plenty of other forums who will quite happily waste their time with tin foil hats and the like. But stuff that is counter-intuitive, odd, obsolete, little known, is all good.
Magnetic amplifiers are obsolete, and because few people really grok transformers and saturation effects, little understood, but they do work. They were used quite extensively in the pre-semiconductor days, but have been totally eclipsed by silicon devices. This means that theory is a little hard to come by, anything on the net has been put there by enthusiasts, not manufacturers, you might even need to dig in paper-based libraries.
What's a q-loop? A quick google doesn't seem to throw up a concensus. There are plenty of things it could be that are compatible with Maxwell's equations.
<edit> Though having looked at your link, it appears to be a parallel LC, in series with some signal. OK, the name of it isn't officially recognised, though the physics is. This is a filter, that will conduct DC, having a drop for DC governed by the resistance of the inductor. It will pass very high frequencies courtesy of the capacitor. It will block (ie present a high impedance at) the resonant frequency of the LC. Depending on AC losses in the inductor (air cored, ferrite cored, iron cored?) it will present a loss to some range of frequencies, ie absorb energy and dissipate it as heat. It may be a useful filter component in some high frequency rectification schemes, especially if the resonant frequency is tuned to the incoming frequency, but it's not going to do anything magical. BTW, there is no such thing as a 'single terminal' power supply. There are always two, even if only one of them is a physical wire. <\edit>
Registered Member #3859
Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179
I am asking for some book title that can tell me where what electromagnetic device types (core types, shape, winding types) are used and what there qualities are.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Magnetic amplifiers were used in the control circuits of the German missiles which fell on London in 1944/5. There is nothing mysterious about them.
Why not consult Mali, P. Magnetic Amplifiers - Principles and Applications, Rider, New York, 1960, which you can download free here:
I couldn't for the life of me think what a 'Q-Loop' might be, until I recalled reading claims made some years ago about a ferrite rod antenna (US: 'loop stick' etc) which had a feedback winding that gave the antenna marvellous properties, though I've forgotten now what these were said to be. You might call such a device a type of 'Q-multiplier', a term more usuallly applied to a means of increasing IF transformer selectivity in old communication receivers by the application of positive feedback. Is your Q-loop anything to do with any of this?
Registered Member #3859
Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179
I am not sure if they are Q loops or not but i am talking about a simple capacitor and inductor in parallel: .......|...... .......|...... ..----------. .|...........|. .|...........3. __..........3. __..........3. .|...........3. .|...........|. ..----------. ........|...... ........|......
Registered Member #531
Joined: Sat Feb 17 2007, 10:51AM
Location: Burlington, Vermont
Posts: 125
Proud Mary wrote ...
I couldn't for the life of me think what a 'Q-Loop' might be, until I recalled reading claims made some years ago about a ferrite rod antenna (US: 'loop stick' etc) which had a feedback winding that gave the antenna marvellous properties, though I've forgotten now what these were said to be. You might call such a device a type of 'Q-multiplier', a term more usuallly applied to a means of increasing IF transformer selectivity in old communication receivers by the application of positive feedback. Is your Q-loop anything to do with any of this?
I think you are referring to John Sutton's "Black Hole Antenna".
IIRC it was a broad banded take on the old Q-Multiplier concept.
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Classification of electromagnetic devices and Q-loop resonators.
