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Extra resources for High Reliability Magnetic Devices: Design & Fabrication
If the gap dimension gets too large the fringing flux will strike the copper winding and produce eddy currents, generating heat, just like an induction heater. The fringing flux will jump the gap and produce eddy currents, in both the core and winding, as shown in Figure 1-12. p v = Pcu + Pe + p»' [watts] Eddy currents Core Winding Fringing Flux L/2 Magnetic Path Figure 1-12. Fringing Flux Around the Gap of an Inductor Design with a C Core. Copyright 2002 by Marcel Dekker, Inc. All Rights Reserved.
Amorphous Material Properties Material Major Initial Flux Density Curie dc, Coercive Name Composition Permeability Tesla Temp. 5%B 3. 5% Si 2714A 66% Co E 1000 15% Mo 4% Fe 2714AF 66% Co 15% Mo 4% Fe Nanocrystal Vitroperm 500F* * Vitroperm is the trademark of Vacuumschmelze. Copyright 2002 by Marcel Dekker, Inc. All Rights Reserved. 6 Figure 2-8. Amorphous 2605SC B-H Loop: 78% Ni 17% Fe 5% Mo. 01 . 5 - n^ Figure 2-9. Amorphous 2714A B-H Loop: 78% Ni 17% Fe 5% Mo. Copyright 2002 by Marcel Dekker, Inc.
5 Initial Permeability Flux Density P D Hi 750-15 K 15-1500 Copyright 2002 by Marcel Dekker, Inc. All Rights Reserved. max Resistivity Q - cm 10-100 106 Manganese-Zinc Ferrites This type of soft femte is the most common, and is used in many more applications than the nickel-zinc ferrites. Within the Mn-Zn category, a large variety of materials are possible. Manganese-zinc ferrites are primarily used at frequencies less than 2 MHz. Nickel-Zinc Ferrites This class of soft ferrite is characterized by its high material resistivity, several orders of magnitude higher than Mn-Zn ferrites.