Interbundle Penetration Of Wire Bundles Improves Their Packing Factor
by Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Nov 15 2018
Focus:
When winding transformers or coupled inductors with twisted wiring bundles, turns of adjacent
wire bundles are typically wound close-packed to maximize packing factor (and in particular,
packing porosity) and ultimately maximize winding current density. Bundles of a small number of
strands can pack together more closely than those with a large number of strands because of the
sinusoidal variation in their outside diameter. This article examines the extent to which
twisted wire bundles can penetrate each other by fitting into the dips in adjacent windings and
thereby increase packing factor. This analysis quantifies the relationship between the number
of strands in a twisted wire bundle and the extent to which one wiring bundle penetrates or
“meshes with” the other.
What you’ll learn:
- How to determine the degree of interbundle penetration achieved with wiring bundles used to wind transformers
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