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Ferrite Toroid Coil Winding - Understanding Ferrite Cores

Electric power transformers are built with up to three levels of winding. The linkage between the windings and flux is the primary source of energy for the transformer. Low-reluctance magnetism helps to create an effective flux linkage that connects to the core. Cores are constructed with different materials, such as silicone steel and ferrite. Improper construction of a core, including size, material, and winding will have adverse effects on the electronic device that it is functioning in. Ferrite is one of the most popular materials for construction.

Ferrite is a commonly used material when building transformers. The material is:

  1. Nonconductive
  2. High current resistivity
  3. Small eddy current losses (over broad frequency ranges)
  4. Easily adjustable inductors
  5. Frequency circuits ranging from 10 KHz to 50 MHz
  6. Wide band transformers

Ferrite cores are constructed with ceramic compounded that makes final products ferromagnetic. A ferrite type transformer is any transformer that has windings made from ferrite. When used inside of a transformer, ferrite cores are constructed mostly from iron oxides (zinc, manganese, and nickel compounded are added to the core).

When building toroid transformers, typically two different ferrite alloy are used. Manganese zinc ferrite has a high saturation level, where as nickel zinc ferrite has a higher resistivity.
For more information about designing toroids, please give us a call to speak with one of our highly trained engineers.


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