Laminated Iron Core Inductor

A line side filter inductor with the core composed of an iron powder composite material is an interesting alternative to the so far most often used laminated steel sheet cores.

Laminated iron core inductor. Laminated steel core inductor in such type of inductors the core is laminated which means that it is made up of a bunch of thin sheets placed on top of each other in a tight form. Insulation is required between laminations to reduce eddy currents. The interlaminar eddy current ib is governed by total flux and resistance of the core stack. It is primarily dependent upon stack width and height the number of laminations and the surface insulation resistance per lamination.

The sheets are coated with insulation to increase its electrical resistance prevent eddy current flow between them. Model of laminated iron core inductors for high frequencies. The use of ferrite core. Inductors for filtering devices are widely employed in power electronics applications in order to reduce voltage and current harmonics caused by switching converters.

Ferrite materials have a negative temperature coefficient regarding flux density. Two lead are connected to two ends of the coil and is also centre tapped to the half of the length of the coil. Laminated magnetic cores are made of stacks of thin iron sheets coated with an insulating layer lying as much as possible parallel with the lines of flux. 1 iron cored inductors the figure represents the constructional details and symbol of an iron cored inductor which consists of a coil wound on laminated iron core or cobalt or nickel alloys.

Iron alloys when designed correctly and used in the right application will perform well at frequencies up to 100khz. Iron alloys retain 90 of their original inductance at greater than 1 2t. 1 2 iron powder cores for use in line filter inductors. We propose a model with frequency dependent lumped parameters to represent the behavior of laminated iron core inductors that are used in switching converters i e for excitation frequencies.

The layers of insulation serve as a barrier to eddy currents so eddy currents can only flow in narrow loops within the thickness of each single lamination.