Iron Powder Cores + SMC are made of high purity iron powder, mixed with insulating epoxy resins and compressed at extremely high pressures to form toroids, blocks, pot cores etc. This results in a magnetic material with distributed gap. Glass fibres are sometimes added to increase strength.
Iron powder cores are meant to store magnetic energy with least core loss. So they offer low permeability (30 to 600) and produce low core loss at high frequencies (up to 20 kHz). These materials are made primarily as 2D shapes of toroids, pot cores etc. for use in transformers and inductors by Power Electronics industry. The standard 2D shapes do not require additional tooling costs.
Soft Magnetic Composites (SMC) are meant to transmit magnetic energy with least core loss. So their permeability is significantly higher than Iron powder cores (but lower than electrical steels). They are primarily made in 3D shapes of T-cores for use in electric motors, sensors etc. Because the 3D shapes are custom, they require significant investment in tooling costs.
The trace impurities (that impact the core loss and B(H) curves) differ with manufacturers, even if the composition is same. So MagWeb lists the properties of steels by each manufacturer, irrespective of their grade.
MagWeb’s Iron Powder + SMC Folder has 174 excel files listing magnetic properties of these materials, produced by 7 manufacturers. It includes data for Iron Powder Cores and Soft Magnetic Composites. Of these, 89 contain B(H) magnetization curves/permeability curves while 85 contain core loss curves. For a full list of commercial names of all these materials, please click on List of Materials – I. Iron Powder Cores + SMC.
Version 5 also contains a DIGEST file that lists all these materials and their magnetic properties in a single excel file.
By downloading this folder you will have 174 files of magnetic properties of all iron powder cores + SMC produced world wide at your finger tips!
Please review the Handbook for more technical information on the magnetic properties of these materials.
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