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Registered Member #4230
Joined: Sat Nov 26 2011, 05:50AM
Location: Socketville
Posts: 53
What are the method(s) of characterizing a given sample of unknown magnetic material? I have the idea of applying a fast rising pulse and measuring the resulting current. Also some AC sweeps.
Is there a good list of core materials and their suitability for a particular use?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Given that ferrite cores are very inexpensive and readily available, it would much more cost effective to purchase a ferrite of known type than to spend the time required to properly characterize an unkonwn ferrite and even then, you'd still be partially guessing.
Unless, you have some very unique ferrite core, say something very large etc... than i would simply just purchase or sample a known ferrite for your application.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Consider the properties that are characteristic of the material and are not affected by its microstructure. Such properties include Curie temperature, saturation magnetisation, and magnetocrystalline anisotropy.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Ferrite vs. iron powder - easy to distinguish by measurin the Al value and core permeability. Maximum flux density - for most ferrite materials use 0.3T, for iron powder 1T The frequency limitation of a ferrite material is a bit more complex thing. You can guess it by the permeability (a "low frequency" power ferrite has a relative permeability of several thousand, the HF ferrites have a few hundred). Also you can try measuring the W/kg figure, simply by connecting it to a low impedance source (such as a small H-bridge) and measuring the supply current.
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Characterization of Magnetic Core Materials
