Bifilar Winding
Bifilar Winding
(OP)
I've never used Bifilar Winding, and had a question regarding some conflicting information. This is for parallel bifilar winding where the current flows in the same direction in both wires.
I've seen it said that bifilar winding 'multiplies' the inductive field. But that doesn't seem to make sense to me, since parallel inductors reduce total inductance.
Let's say for a particular core I need 20 windings of a single wire to get X microfarads. How many windings of each wire would be needed for a bifilar on that same core to get X microfards?
Thank you lots, my litz choices are limited so I need to do bifilar to meet my ampacity needs.
I've seen it said that bifilar winding 'multiplies' the inductive field. But that doesn't seem to make sense to me, since parallel inductors reduce total inductance.
Let's say for a particular core I need 20 windings of a single wire to get X microfarads. How many windings of each wire would be needed for a bifilar on that same core to get X microfards?
Thank you lots, my litz choices are limited so I need to do bifilar to meet my ampacity needs.





RE: Bifilar Winding
Proximity affect and fringing flux from other windings and the core gap(s) would be the inductive concerns IMO.
RE: Bifilar Winding
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Bifilar Winding
Skogsgurra, good eye. Yes, I meant henries.
RE: Bifilar Winding
In other cases, multiple parallel wires, or litz wire will be used to wind.
First of all, using many parallel wires increases the cross-sectional area allowing for more current as jimbofitz pointed out. And, its sure is a lot easier to wind several 18 AWG wires rather than a single 12 AWG as well.
Secondly, if the transformer or coil is being used at high frequencies, then skin effect may be important. That is why sometimes you will see woven wire (litz wire) consisting of a large number of very small gauge wires being used together for a high current winding.