![]() ![]() If you connect only the primary wires of a transformer, and measure the inductance, no energy leaves through any secondary windings, so the thing looks like (and is!) just an inductor. E-I laminations are usually named by the tongue width: EI100 has a tongue that is 1.00 inches wide. As you can see, since the proportions are pre-determined, you can specify any one dimension and all the rest are determined. The middle part, or tongue, of each E is twice as wide as the two outer legs, and the empty area stamped out of the E (which forms the I) is half as long as the E is high from top to bottom. The I's are stamped from the open areas of two end-facing E's. This is the least expensive shape for transformer iron, and is the standard for the industry for non-special purpose transformers. The middle projection or tongue of the E is placed through the center of a coil of wire, and the I placed at the end like this" EI" so the iron forms a complete magnetic path through the center and around the outside of the coil.Īn E-I lamination with proportions such that two E's and two I's are stamped from a rectangle of iron with no waste left over. Otherwise, go back and select a new (probably bigger) core size and loop back through the process.Ī flat transformer steel lamination composed of pairs of E-shaped and I shaped pieces.Otherwise, select a new interleave and go back to fitting wire.Understand the transformer equivalent circuit.Or just read on here to see some of the start of the design procedure. You can jump down to here to see how you might reverseĮngineer an output transformer nondestructively! ![]()
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