How To Calculate Toroid Winding Length

by Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Sep 16 2013

Focus:
The toroid or ring core shape has some significant advantages over round and square winding-window cores. Toroids contain the magnetic field better, reducing radiated circuit noise. They also dissipate heat more effectively. Yet when it comes to winding toroids, the winding length must be determined beforehand. It takes some algebraic work to derive winding length and the working equations will be given in this article. For the better engineers who do not like to use equations without knowing where they came from, the outline of their derivation is also given. According to the author, the winding lengths found using these equations are typically accurate to within 2% of the actual lengths.

What you’ll learn:

• How to calculate winding length for toroidal power inductors and transformers

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