A New Method Of Winding Design Optimization (Part 2): Optimal Window Magnetic Operating Points

Focus:

In part 1, the influence of various winding design parameters on eddy current effects was analyzed and expressed as Fr, the constant-frequency resistance ratio for wire strands. However, for actual design purposes, what’s needed is a version of this resistance ratio that applies to the bundles of strands that comprise the winding turns. This parameter is known as fr and this part 2 presents two methods for achieving minimum fr in winding designs. The first method is a graphical approach in which Dowell’s equation is expressed as fr and plotted under different design constraints such as constant number of layers, constant number of strands, and constant area. The graph is then used to identify ξr operating point (op-pt) values. The second method derives design formulas that can be used to calculate the ξr op-pt values. Finally, a winding design procedure is described that makes use of the op-pt formulas.

What you’ll learn:

• How to use Dowell-equation graphs to minimize winding losses expressed as fr, constant- frequency resistance ratio for wire bundles in transformer and inductor design
• How to calculate ξr operating point values corresponding to minimum winding losses in transformer and inductor design

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Author & Publication:

Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Oct 16 2017

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