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How to choose a magnetic core?

by：Transmart 2022-08-02

Classification of Magnetic Materials

Magnetic materials are divided into soft magnetic materials and hard magnetic materials. Magnetic materials that are easily demagnetized after magnetization are called soft magnetic materials, and their coercivity is small. Hard magnetic materials (such as magnetic steel, permanent magnet alloys) are not easy to demagnetize.

Soft ferrite cores are an important class of magnetic materials. Its application fields are very wide, such as in radio
Magnetic rods, magnetic cores in tape recorders and TV sets, magnetic rings in deflection coils, magnetic heads in video recorders, and high-frequency transformers in switching power supplies.

There are many varieties of soft ferrite cores with different shapes, which can be roughly classified as follows:

(1) Classification by shape: there are mainly threaded magnetic cores, annular magnetic cores (referred to as magnetic rings), tubular magnetic cores, and pot-shaped magnetic cores
(ie magnetic tank), E-shaped, Japanese-shaped, U-shaped, T-shaped, I-shaped, and king-shaped magnetic cores. There are also single-hole, double-hole and multi-hole cores.

(2) Divided by operating frequency: there are low frequency, medium frequency, high frequency and very high frequency cores.

(3) Divided by material: The material grades are as follows: MXO-manganese-zinc ferrite; NXO-nickel-zinc ferrite; NQ-nickel-lead ferrite; NGO-nickel-zinc high-frequency ferrite; GTO-very high frequency Ferrite.

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