Electronics > Projects, Designs, and Technical Stuff
How do "Goofy-Wound" Inductors Work?
SuzyC:
T3sl4co1l, thanks again for soothing my damaged brain.
But since this type of wiring cancels the magnetic field, is energy lost in the process due to flux creation/cancellation?
Would a receiver antenna element made this way just behave like a straight piece of wire( or just like hay-wire)?
You are saying then that such an inductor has almost no practical use, with lengths of wire the optimal substitute in any circuit or device?
Isn't cancellation of local fields means no radiating field a very useful property for transmitting energy in a very sensitive or high-power RF circuit or even in a power transmission line?
cdev:
Is something like this what you mean?
They actually cancel out!
The word you may be looking for is variometer.
This is not the world's best variable inductor design, its my understanding that the Q is relatively low also the amount of variability is fairly limited compared to other designs, but they do work and they are easy to build.
ArthurDent:
General Radio Co. variable inductors have been around for ages and I have one sitting around somewhere.
https://www.radiomuseum.org/images/radio/general_radio/variable_inductor_107_k_1322111.jpg
edpalmer42:
Suzy, you mentioned a SMPS. Did you find one of these in a SMPS?
I've never taken one apart to find out how it was wound, but could this be a common-mode filter choke?
Ed
ejeffrey:
--- Quote from: SuzyC on January 11, 2019, 01:59:19 am ---T3sl4co1l, thanks again for soothing my damaged brain.
But since this type of wiring cancels the magnetic field, is energy lost in the process due to flux creation/cancellation?
--- End quote ---
No, flux cancellation doesn't cause energy loss. Its not like the flux is created and they destroyed, the current path just creates very little flux. Energy will be lost due to the wire resistance of course, and if there is imperfect cancellation then you can get radiation.
--- Quote ---Isn't cancellation of local fields means no radiating field a very useful property for transmitting energy in a very sensitive or high-power RF circuit or even in a power transmission line?
--- End quote ---
Sure, it is useful if you want to make a high power 50 ohm load or other RF power resistor. But that's about it.
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