Ferrite cores are widely used in household and radio engineering. The main purpose of their use is to eliminate interference in the control and power electrical conductors.
Ferrites are chemical compounds of iron oxide with oxides of other metals. The composition of the substance can vary depending on the required properties of the finished product.
Core production
Ferrite cores are produced using powder casting technology. A mixture of powders, containing the necessary components in carefully calibrated proportions, is pressed into a workpiece of the required shape, which is baked at temperatures up to one and a half thousand degrees. Baking can be carried out both in air and in a special gas atmosphere. At the last stage of manufacturing, the ferrite product cools slowly over several hours. This technology not only makes it possible to produce alloys with specified characteristics, but also to produce products that do not require further processing.
Ferrite core applications
Ferrite cores are most widely used in electrical and radio engineering. Since ferrite has a high magnetic transmittance and low electrical conductivity, it is indispensable for assembling low-power transformers, including pulse ones. Ferrite cores are also used as a means of passive protection against high-frequency electrical interference. This phenomenon is most typical for switching networks of control devices, where interference can be induced even in a shielded cable, which reduces the efficiency of signal transmission.
Ferrite core types
For winding transformers, U-shaped and W-shaped ferrites are produced. The rod form of ferrite products is used in the manufacture of magnetic cores: for example, cores for high inductance coils are made of ferrite. The average person most often encounters ferrite rings and cylinders, which are used as noise filters on communication cables: USB, HDMI, LAN and others. Advanced technology makes it possible to manufacture products of very complex structure, the size of which is sometimes less than a tenth of a millimeter.
The advantage of ferrite over similar magnetic circuits
The low electrical conductivity of the material avoids the formation of eddy currents during magnetization reversal of the magnetic circuit. According to this indicator, ferrite surpasses even finely charged electrical steel. Also, the ferrite can be given certain properties at the production stage, which allows in advance and with high accuracy to adapt the product to the needs of a particular device in which the ferrite will be used. Ferrite can actively absorb, dissipate or reflect noise induced in the cable, which is especially important in the construction of high-precision devices: the low weight and overall dimensions of ferrite cores allow them to be used without disturbing the layout of equipment inside complex devices or complexes.