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Three Popular Materials for Toroidal Transformer Coils

ToroidsToroids, or toroidal transformers, are commonly used devices within many electronic devices we use daily. From lifesaving medical applications to consumer electronics, toroids find a home in many electronics. This type of power transformer aims to create safe on/off capabilities. Although toroids are commonly used, different types meet the needs of different applications. The main distinction between different toroids is the material of the core. Choosing a material is one of the most important decisions when designing a toroidal transformer. Below, we will go over some of the most commonly used materials for constructing toroid cores.

Ceramics is the most commonly used material because it provides a reliable form for the coil. Because of this ability, the structure can hold the terminals in place. Consider using ceramic when you require low thermal coefficients of expansion. Ceramic toroid coils do not have magnetic properties, so there is no increase in permeability. Another common term for this toroid is an air core.

Ferrite cores are constructed from a mix of iron oxide and other materials that give the device a crystalline molecular structure. This type of structure is created through firing ferrite material at high temperatures.

MPP core stands for molypermalloy powder, and it is a magnetic material that is used because of its inherent distribution of air gap. Unlike the other two materials listed above, MMP is magnetic. Because the material has a distributed air gap, the toroid can easily store higher levels of magnetic flux (when compared to other toroid core materials).

Regardless of the type of core material you choose, make sure you pick one that meets specific application goals. Toroids and toroidal transformers are great tools for managing electricity flow as electronic systems turn on and off.

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