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Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
The recent discussion of segmented winding vs. highly insulated solenoidal layers, and consequent issue of self-capacitance, reminded me of a winding style whose name I had forgotten. Recovered it after about an hour of searching: Bank Winding. Has that been discussed here?
At the cost of being hard to make, it seems to give the benefits of a segmented winding without a segmented bobbin. Developed to reduce the capacitance of a multilayer coil, it (not coincidentally) reduces the turn-to-turn voltage. If you aren't familiar with the term, see or the following, from page 10 of
The authors of the second reference do say "probably impractical in SMPS magnetics". But given the patience of Tesla-coil winders, and the availability of 20 volts per turn with giant ferrite cores, maybe it's not a preposterous idea. On the Internet I found reports of DIY coil winders with CNC traverse mechanisms.
[edit] Here's one patent about bank winding of ignition coils, which addresses the issue of new turns wanting to slip down the conical substrate of older turns:
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I have used nylon rod with nylon washers as a way of winding segmented RF chokes. It's just a question of choosing washers with the same ID as the OD of the rod.
Glass test tubes also make good formers for HF chokes.
I imagine these technique could be translated for xformer use.
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Bank winding in HVHF transformers?
