Iron Powder Core Permeability

For passive magnetic levitation a relative permeability below 1 is needed corresponding to a negative susceptibility.

Iron powder core permeability.

G18 55 385 6 6 green red a good dc saturation characteristics. Pure iron iron 0 45 phosphorus and iron 3 silicon. Their permeability range is from less than 3 µi to 35 µi and can offer excellent q factors from 50 khz to. The chart above shows the permeability of three sintered powder metal soft magnetic materials.

A magnetic core is a piece of magnetic material with a high magnetic permeability used to confine and guide magnetic fields in electrical electromechanical and magnetic devices such as electromagnets transformers electric motors generators inductors magnetic recording heads and magnetic assemblies it is made of ferromagnetic metal such as iron or ferrimagnetic compounds such as ferrites. Permeability varies with a magnetic field. Stable and reliable properties effective permeability has excellent frequency property. There are two basic groups of iron powder material.

Good dc saturation characteristics. The difference depends on the core size permeability core finish thickness wire size and number of turns in addition to the way windings are put on the core. The carbonyl iron cores are especially noted for their stability over a wide range of temperatures and flux levels. Silicon iron powder compound.

Magnetics powder core products kool mu sendust mpp molypermalloy kool mµ max kool mu hƒ edge tm high flux xflux and 75 series materials are distributed air gap cores that are primarily used in power inductor applications specifically in switched mode power supply smps output filters also known as dc inductors. Iron powder cores series products sendust core mpp core high flux core 1. The charts that are created by manufactures should show the best type of powered iron to use for specific frequency ranges. Examples of the use of powdered iron can be found in rf filters rf amplifiers and if amplifiers.

A good magnetic core material must have high permeability. Used for emi filters and dc chokes. This material has low core loss similar to the 8 material with higher permeability and a lower cost. High saturated magnetic induction strength it may work in large current without saturation.

Has highest permeability of all of the iron powder materials. A hydrogen reduced material. Ppm oc material density g cm3 color note y8 35 255 6 5 yellow red a good high frequency material it has low core loss and good linearity under high bias conditions. Values shown above are approximate and valid only at the magnetic fields shown.

The difference is negligible for 125µ and higher and turns greater than 500. Character of iron powder cores. Iron powder cores general material properties material reference permeability µo temp.