Stepped Transformer Core Sections and Geometric Fill

A round winding does not make the steel section round. Rectangular packets form steps inside the circle. With optimized widths, the article gives geometric fill of eighty-five point one percent for three steps, ninety point eight for five, and ninety-five point three for ten. These figures come before stacking factor and cooling ducts. More steps fill more of the circle, but each adds another strip width and another cutting setup. Narrow outer packets need good edges and secure clamping. Compare the steel section you need with the diameter available. Choose the step count together with cutting capability, cooling passages and assembly conditions. More steps alone do not establish a better core.