There are many types of transformers, most using the alphabet to describe them: R-core, C-core, EI, and what's most in vogue, the toroid. The label toroid comes from its shape—a torus. Torus refers to a rotating circular form around a line that lies in the same plane but does not intersect it. Gobbledygook for a circular shape with a hole in the center. Donuts and bagels are torus shaped. Remember in yesterday's post we found out that the classic brick shaped transformer, the EI, wrapped wire around a stack of metal sheets. The metal sheets (laminations) were shaped like a capital E. Add more sheets of metal cut in the form of a capital I and you make a square transformer. Now, imagine those same sheets of metal wrapped in a different shape. Round. Circular and stacked, side by side, to form a donut. Wrap wire around the donut and you have... ...wait for it... a toroidal transformer! One of the greatest mysteries to most people, including me at one time, is how the hell does a machine wind wire around a donut? Seems kind of impossible, right? Here's a video I dug up on YouTube. It's of some unknown Chinese factory winding a transformer, the subtitles are in English and put a smile on my face. It's quite fascinating to watch. Click on the picture. Why use a toroid over an EI? That's what we'll look at tomorrow. Happy watching.
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