An Ultimate Guide on Ferrites – Types and Applications

Ferrites are magnetic materials that are considered better than pure metals because of their wide range of properties, such as low cost, high resistivity, easy manufacturing, and superior magnetization. They are widely used in radar, audio & video, memory cores of computers, microwave devices, and satellite communication. Their high electrical resistance and low eddy current … Read more

Semiconductor Materials- Types & Properties

Semiconductors are those substances whose electrical conductivity lies in between conductors and insulators. In terms of energy band, the valence band is almost filled and conduction band is almost empty. Further, the energy gap between valence band and conduction band is very small. The semiconductor has filled valence band, empty conduction band, and small energy gap … Read more

Recombination & Trapping Processes in a Semiconductor

Recombination and trapping processes in a semiconductor Recombination is the process where an electron moves from the conduction band into the valence band so that a mobile electron-hole pair disappear. Classical mechanics requires that momentum be conserved in an encounter of two particles. Since the momentum is zero after recombination, this conservation law requires that … Read more

Magnetic bubbles – Applications

Magnetic bubble memory consists of magnetic bubbles used to store data bits. These bubbles move in thin films of magnetic material. The bubbles are cylindrical magnetic domains having polarization opposite to that of the thin film in which they are embedded. A thin film of magnetic garnet contains wavy strips of magnetic domains when an … Read more

Soft and Hard Magnetic Materials

Soft Magnetic Materials These materials are easy to magnetise and demagnetise. These materials favour rapid switching (it means high frequency) of magnetism to applied ac field. These materials have low retentivity. Low coercivity. High permeability High magnetic saturation Low hysteresis losses because of the lesser area of the hysteresis loop. These materials are used for … Read more

Insulating Materials for Cables & Electronic Equipments

Insulating Materials for Cables The insulating materials (dielectrics) used for cables must have low discharge current, low dissipation factor (low loss tangent), and should be chemically stable. The materials generally used are impregnated paper, bituminous compounds, rubber, compressed air, mineral oil etc. In the present days, cross-linked polyethylene cables (XLPE) are manufactured for 11 kV, … Read more

Electrical Machine Insulation

In electrical machines, the insulation system must withstand the high electrical stresses and severe mechanical stresses induced by the magnetic field of the moving rotor. In machines, multi-turn windings are put in narrow armature slots, which are usually grounded. Rotating machine stator insulation construction is divided into principal types: Random wound conductor machines with small … Read more

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