Know about FERRITE COIL

Posted: Sep 26, 2011 |

Out of all the constituents Ferrite Coil is made up of, iron or Fe is its main constituent. It is also popularly known as alpha iron or α-Fe. Major role of it is to tune circuits for e.g. it is used ti tune inductors used in radios because it is ferromagnetic and has properties like high permeabilty.

It is a solid solution meaning it has one or more than one solutes dissolved in a solvent. Such mixture is rather referred to as a solid solution than a compound because even after the addition of the solute molecules, the crystal structure of the solvent does not change. It also exhibits properties of a ferromagnetic material i.e. it is a material whose atoms behave like magnetic dipoles which are produced by the spin of unpaired electrons. In a ferromagnetic substance certain domains are formed in the interior of the material within which dipoles tend to align in a given direction though the various domains themselves might be randomly oriented. Out of the three major types of cubic crystal system, namely Simple cubic (SC), Body centred Cubic (BCC) and Face centred Cubic (FCC also called cubic close-packed), the solid solution follows the Body centred Cubic system. In this, the unit cell i.e. the smallest cell the substance can be broken down to, is in the shape of a cube. The Body centred Cubic structure of the unit cell basically has a total of 9 lattice points (eight corners and one in the centre of the cell). The net total however is 2 cause the eight lattice points in the corners of the cube are shared by seven other cells boiling down the effective value to 1/8*8=1 in addition to the 1 in the centre. The structure is wound in a crisscross way. This is how steel and cast iron are able to get the magnetic properties.

The major reason why materials like Ferrite Bead Coils are used in electrical components is because of their ability to act as an obstruction to high frequency noise. Their high inducting power are capable of warding off a portion of the energy the noise possesses. In recent times, use of these coils and beads have shot up to a great extent because of their extensive use in various electrical components either to tune the circuits or to act as obstruction to high frequency noises as mentioned above. This is the major reason why a lot of companies have started producing these in huge bulk even providing the customers the facility of purchasing the coils online.

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