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The Difference Between Ferrite Core And Iron Powder Core

May 09, 2019

1. Ferrite core is a ferromagnetic metal oxide. As far as electrical properties are concerned, the resistivity of ferrite is much larger than that of metal and alloy magnetic materials, and it also has higher dielectric properties. The magnetic properties of ferrites also show high permeability at high frequencies. Therefore, ferrite has become a widely used non-metallic magnetic material in the field of high frequency and weak current. Ferrite has low saturation magnetization (usually only 1/3-1/5 of pure iron), which limits its application in low-frequency high-power and high-power fields requiring high magnetic energy density.


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2. Iron powder core is a popular term for magnetic material Fe3O4, which is mainly used to solve electromagnetic compatibility (EMC) problems in electrical circuits. In practical application, different kinds of other substances will be added according to different requirements for filtering in different bands.




Electromagnetic compatibility (EMC) refers to the clutter generated by various reasons in the electrical circuit. These clutters not only harm the normal operation of the electrical circuit, but also harm the human body to a certain extent. Therefore, countries (especially the European Union) have various regulations on this, namely electromagnetic compatibility (EMC).




The clutter on the wire mainly solves its EMC problem through the magnetic core. When a certain band of clutter passes through the core, the electromagnetic characteristics of the core cause the current in this band to be converted into magnetic force and part of the heat which is consumed. To achieve the purpose of reducing clutter.




3. Ferrite core  for common mode, iron powder for differential mode, and magnetic permeability of iron powder is smaller than that of ferrite; iron core includes ferrite, and iron powder core includes MPP, HF, SENDUST ferrite for high frequency but not DC, and iron powder core for low frequency can be DC.


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4. The biggest advantage of ferrite soft magnetism is that it has high permeability and resistivity (102-106_.cm) at high frequency, but its Bs is much lower than that of metal materials, so it can only be used at low power. The magnetic powder core just fills the gap between metal soft magnetic material and ferrite. Usually, the use frequency from low to high is metal magnetic powder core ferrite, and the bearing power from low to high is ferrite magnetic powder core metal.


Ferrite, as a multifunctional magnetic material, can make many inductive devices. At present, most professional power designers in China are familiar with ferrite, but they are unfamiliar with metal magnetic powder cores.


Strictly speaking, metal magnetic powder cores are specialized in manufacturing inductance devices. The differences between metal magnetic powder cores and ferrites are listed below.


1) Metal magnetic powder cores have higher Bs and lower permeability. At the same time, the magnetic bias curve is quasi-linear, and can withstand larger DC bias, because the core is not easy to saturate.


2) The uniform distribution of air gap in metal magnetic powder core can avoid the local loss caused by the opening of air gap.


3) Metal magnetic powder cores react more slowly than ferrites to environmental change (temperature change and mechanical impact), which is determined by the characteristics of metal and ceramic materials themselves. The former has a high Curie temperature, and its permeability changes very little in the working range, so its reliability is better than that of the latter. This is also the reason why metal magnetic powder cores are widely used in military industry. The working temperature range of metal magnetic powder core is wider than that of ferrite, and some materials can even work at 300 C.


4) The design method of metal magnetic powder core is relatively simple, especially in the design of power choke, it is almost unnecessary to test dynamic indicators to verify the design. Due to the poor stability of ferrite materials, different designs are needed for different situations, and dynamic tests are needed.




The permeability of ferrite core is much higher than that of iron powder core. It is generally used in the manufacture of high frequency transformer and common mode inductor. There are many gaps in the iron powder core as the air gap of the magnetic core, which are generally used for energy storage inductance and differential mode inductance.

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