Specific classification of materials for transformer cores

1) The commonly used iron powder core is composed of carbon based iron powder and resin based iron powder. The price is the lowest among the powder cores. The saturation magnetic induction intensity value is around 1.4T; The magnetic permeability range is from 22 to 100; The initial magnetic permeability i exhibits good stability as a function of frequency; Good DC current superposition performance; But at high frequencies, the loss is high. The variation of initial magnetic permeability of iron powder core with the strength of DC magnetic field. The change of initial permeability of iron powder core with frequency (2) permalloy powder core permalloy powder core mainly includes molybdenum permalloy powder core (MPP) and high flux powder core. MPP is composed of 81% Ni, 2% Mo, and Fe powders. The main characteristics are: the saturation magnetic induction intensity value is around 7500Gs; The magnetic permeability range is large, ranging from 14 to 550; Has the lowest loss in powder magnetic cores; Excellent temperature stability, widely used in space equipment, outdoor equipment, etc; The magnetostrictive coefficient is close to zero, and there is no noise generated when operating at different frequencies. Mainly used in high-quality factor Q filters below 300kHz, induction load coils, resonant circuits, commonly used in LC circuits with high temperature stability requirements, output inductors, power factor compensation circuits, etc., commonly used in AC circuits, with the most expensive powder core. High magnetic flux powder core HF is composed of 50% Ni and 50% Fe powders. The main characteristics are: the saturation magnetic induction intensity value is around 15000Gs; The magnetic permeability range is from 14 to 160; Has the highest magnetic induction intensity and DC bias capability in powder magnetic cores; The magnetic core has a small volume. Mainly used in line filters, AC inductors, output inductors, power factor correction circuits, etc., commonly used in DC circuits, high DC bias, high DC, and low AC are more commonly used. The price is lower than MPP. (3) Kool M Cores iron silicon aluminum powder core is composed of 9% Al, 5% Si, and 85% Fe powder. Mainly used as a replacement for iron powder cores, with losses 80% lower than iron powder cores, and can be used at frequencies above 8kHz; The saturation magnetic induction is around 1.05T; The permeability ranges from 26 to 125; The magnetostrictive coefficient is close to 0, and there is no noise generated when operating at different frequencies; Has higher DC bias capability than MPP; Has the best performance to price ratio. Mainly used in AC inductors, output inductors, line filters, power factor correction circuits, etc. Sometimes it also replaces air gap ferrite as a transformer core. 2. Ferrites are ferrous magnetic oxides mainly composed of Fe2O3, produced by powder metallurgy. There are several types, including Mn Zn, Cu Zn, Ni Zn, etc. Among them, the production and usage of Mn Zn ferrite are the highest, while the resistivity of Mn Zn ferrite is low, ranging from 1 to 10 ohm meters, and is generally used at frequencies below 100kHZ. The resistivity of Cu Zn and Ni Zn ferrites ranges from 102 to 104 ohm meters, with low losses in the radio frequency range of 100kHz to 10 MHz.