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Amorphous & Nanocrystalline Magnetic Cores For High Frequency Electronics Amorphous magneticcores allow smaller, lighter and more energy efficient designs in manyhigh frequency applications for Invertors, UPS, ASD (Adjustable speeddrives), and Power supplies (SMPS). 5This design assumes 50% permeability with 50 Oe of bias, 2500 permferrite was used for comparison and core determined at 20 kHz and 2kg B ACWhen comparing Iron Powder to Amorphous core. The Amorphous core willtend to be less expensive, and have lower losses, smaller physicalsize, better heat dissipation, and are mechanically rugged. OurNANO amorphous tape-wound cores are used in (SMPS) Switched-Mode PowerSupplies, Frequency Inverters, ASD and UPS and other applications foreffective noise suppression caused by rapid changes in current. The highpulse permeability of these cores allow excellent performance in thesuppression of reverse recovery current from the diode and ringing orsurge current from switching circuit. The Surge Absorber Cores are normallyused as single-turn choke or with very few turnsThe saturation magnetic flux density is twice as high as that of Co-basedamorphous metal and three times higher than that of Ni-Zn ferrite.
Thepulse permeability and the core loss are comparable to Co-based amorphousmetal. As a result, a small core made of this material offers higherperformance in suppression of surge current and voltage.These cores also feature low core losses and a very high squarenessof the BH hysteresis loop resulting in a high inductance when the currentcrosses zero. This high inductance effectively blocks reverse recoverycurrents created by diodes. The material saturates at relative smallcurrents. Thus, spike blocking is not possible at DC currents.BeadsToroidal type bead coreThere are two types of beads leaded and non-leaded cores.These are used for low power and excellent performance in suppression ofvarious kinds of current or voltage surge, such as the surge from a switchingdiodeHorizontal and vertical mounted leaded coresAMOBEADS ® vs. FM BEADS ®AMOBEADS ®OD(mm)ID(mm)HT(mm)TotalFlux(u Wb)minAlValue(u H/N 2)minFM BEADS ®OD(mm)ID(mm)HT(mm)TotalFlux(u Wb)minAlValue(u H/N 2)minAB3X2X3W41.54.50.93FT-3AM B3X41.552.22AB3X2X4.5W41.56.01.35AB3X2X6W41.57.51.87FT-3AM B3AR41.573.63.3AB4X2X4.5W51.56.02.79AB4X2X6W51.57.53.612FT-3AM B4AR51.577.35.5AB4X2X8W51.59.54.816AMOBEADS ® with lead vs.
FM BEAD ® with leadAMOBEADS ®OD(mm)LENGTHfor Leads(mm)HTfor Core(mm)TotalFlux(u Wb)minAlValue(u H/N 2)minFM BEADS ®OD(mm)LENGTHfor Leads(mm)HTfor Core(mm)TotalFlux(u Wb)minAlValue(u H/N 2)minLB4X2X8F616124.816FT-3AM B4ARL51577.35.5LB4X2X8U620124.816FT-3AM B4ARL51377.35.5Spikekiller ® vs. Nanocrystalline amorphous metal is produced by rapidquenching a molten alloy to produce a amorphous metal and then heat treatingthis alloy at higher than its crystallization temperature The alloy formsNanocrystalline grain size of approximately 10 nm in the amorphous metal.Annealing changes BH loopsM type material is done with no magnetic field appliedduring annealingMtype material is done with no magnetic field applied during annealingWe produce H and L type BH loops by annealing with magnetic fieldsoriented either parallel or perpendicular to the ribbons surface. Advantages are:.
High saturation magnetic flux density, more than 1 Tesla. High permeability over 10,000u at 100kHz. Excellent temperature characteristics. Very high Curie temperature(570°C) resulting in small permeability variation (less than +/-10%)at a temperature range of -40°C to 150°C. Less affected by mechanical stress.
Because of the low magnetostrictionpermeability and core loss changes have very small changes. Very low audio noise emission.
Lower magnetostriction significantlyreduces audible noise emission when the voltage and current appliedto the core at audible frequency range.