Electronics > Projects, Designs, and Technical Stuff
How do "Goofy-Wound" Inductors Work?
SuzyC:
We have all seen a lot of info about different inductors, but what about "Goofy-Wound" inductors?
Suppose we have a toroidial core and I wind half the total winding in one direction and the remainder in the opposite direction(changing from CW winding to CCW).
What is the inductance and behavior of such a hybrid?
Would such an inductor have a practical application?
ArthurDent:
Some wirewound resistors are wound that way (but not on metal cores) to be non-inductive.
beanflying:
Yep generally not an inductor but a wirewound resistor with a very low inductance.
Inductor use discussed here https://en.wikipedia.org/wiki/Bifilar_coil
SuzyC:
Thanks AuthorDent, I know about that. Why so little mention or interest about the use and characteristics of this kind of inductor?
But what can be the use and advantage of an inductor like this that has a practical use in a circuit, besides self-cancellation of parasitic inductance in a power resistor?
Since the type of inductor I describe theoretically has zero inductance, is energy stored in the core or lost to the core?
I saw on the web of Ayrton-Perry winding of long-wire length inductors with zero inductance.
https://en.wikipedia.org/wiki/Ayrton-Perry_winding
Could hi-frequency antenna cables or antennas be improved with such inductors as wires to achieve coupling and phasing different elements of a long multi-element antenna(yagi)?
How would a yagi-like multi-element antenna work with this type of inductor creating the driven/reflector/parasitic elements?
How would this idea work as a way of coupling (optimally delivering power) between stages of a UHF/microwave amplifier or in making slotted-lines/directional couplers?
How could such a thing be of practical use in a SMPS?
Would this idea (Ayrton-Perry) winding work well to deliver high-frequency pulses over a long distance without inductive delay(like in phasing very high-power lasers in fusion reactor research)?
What about a use as speaker cables in large theaters?
What would be the behavior of a shielded coax cable with the center conductor wound this way(Ayrton-Perry)?
And unanswered: if Ayrton-Perry winding is used, does this type of winding hold the magnetic flux to the center of the winding and prevent magnetic fields to be created and affecting things?
If this type of inductor creates magnetic flux in a core, does the net magnetizing power express itself as a power loss?
T3sl4co1l:
https://en.wikipedia.org/wiki/Toroidal_inductors_and_transformers#Total_B_field_confinement_by_toroidal_inductors
Clasp your right hand around the core, fingers pointing in the direction of the wire going from start to finish; your thumb points in the direction of flux generated with a positive current in that direction.
If you reverse the direction of the winding, your thumb will be pointing opposite, and turns will cancel out.
The distribution of turns over the bobbin or ring doesn't matter as much, except for the above illustrated case, and for higher-order effects like equivalent capacitance, and cutoff frequency.
Tim
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