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Why do cores get lapped? What is the surface finish? Lapping is an additional production process used to improve the mating surface. It Is typically done on cores with material permeability of 5000 and greater in order to achieve the maximum AL value for a given...read more
Why do you flat-grind ferrite cores? Cores are flat-ground on the mating surface because of the uneven surface produced during the firing process. It is important for cores to mate with a minimum air gap to keep the gap losses low and to achieve optimum inductance...read more
What is disaccommodation? Disaccommodation, occurring in ferrites, is the reduction of permeability with time after a core is demagnetized. This demagnetization can be caused by heating above the Curie point, by applying an alternating current of diminishing...read more
Why are actual core losses larger than calculated? When calculating the core losses, it is assumed that the structure is homogeneous. In reality, when core halves are mated, there is leakage flux (fringing flux) at the mating surfaces, and the gap losses contribute to...read more
What is the difference between nickel-zinc and manganese-zinc ferrites? MnZn materials have a high permeability, while NiZn ferrites have a low permeability. Manganese-zinc ferrites are used in applications where the operating frequency is less than 5 MHz. Nickel-zinc...read more
What is a ferrite core? Ferrite cores are dense, homogeneous ceramic structures made by mixing iron oxide (Fe2O3) with oxides or carbonates of one or more metals such as manganese, zinc, nickel, or magnesium. They are pressed, then fired in a kiln to 1300o C, and...read more
How important is permeability in power materials? Permeability is flux density, (B), divided by drive level, (H). Power materials are generally used for high frequency transformer applications. Hence, the important characteristics are high flux density and/or low core...read more
Custom cores do not necessarily follow published data values. Many parameters must be considered, for example, mechanical tolerances. A figure of +/-2% is a guide due to shrinkage from sintering. Linear shrinkage can be 16 – 20% whilst volume can be affected up to 40%.
Permeability is a published calculation with values using a ring core. Custom geometry can have a significant effect and therefore, feasibility must be checked by core shape.
Magnetics® soft ferrite cores are an oxide made from Iron (Fe), Manganese (Mn), and Zinc (Zn) which are commonly referred to as manganese zinc ferrites. They have a low coercivity and are also known as soft magnetic ferrites. Because of their comparatively low losses...read more
Are you trying to use an inductive sensor but you have an interfering conductor nearby? This problem can be resolved by inserting a sheet of ferrite material between the interfering metal and the sensor coil. Facebook Twitter Instagramread more