![]() They are passive electronic components, consisting of a circular ring or donut shaped magnetic core of ferromagnetic material such as laminated iron, iron powder, or ferrite, around which wire is wound.Īlthough closed-core inductors and transformers often used cores with a square shape in the past, the use of toroidal-shaped cores has significantly increased because of their superior electrical performance. ![]() Toroidal inductors and transformers are inductors and transformers which use magnetic cores with a toroidal (ring or donut) shape. The magnetic field tended to escape from the core at the sharp bends. In the past, most transformers were wound on rectangular-shaped cores.
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