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FEER42 Datasheet(PDF) 8 Page - NEC |
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FEER42 Datasheet(HTML) 8 Page - NEC |
8 / 71 page ●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data. ●Please request for a specification sheet for detailed product data prior to the purchase. ●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog. 9603FERVOL05E1001T0 Ferrite Cores VOL.05 8 ●Curie temperature Tc (゜ C) This refers to the ambient temperature at which the magnetic core shifts from strong magnetism to paramagnetism. In actual practice, to obtain the Curie temperature, the specimen's initial magnetic permeability is measured and the relationship of this to temperature is drawn in a diagram. At the bottom, the exten- sion of the line linking the 80% of maximum point and the 20% of maximum point is taken as the Curie temperature. ●Disaccommodation factor DF This factor applies when the fluctuation of magnetic permeabili- ty over time seems to be mostly linear with the time logarithm. It is expressed by the following formula. D F = . (t 2 > t1) Here μ 1 : following complete demagnetization, the magnetic permeability after the passage of t1 seconds. μ 2 : following complete demagnetization, the magnetic permeability after the passage of t2 seconds. ●Induction factor AL As shown in the following formula, this refers to self-inductance that occurs per unit winding in a coil of constant shape and dimensions wound around the magnetic core. AL = Here L: Self-inductance (H) in the coil when there is a mag- netic core N: Number of all the coil's windings ●Resistance ρ (Ω・m) This refers to the electrical resistance per unit cross-section area and unit length. ●Density d (kg/m2) This is calculated as follows from the magnetic core volume and weight. d = (kg/m3) Here W: magnetic core weight (kg) V : magnetic core volume (m3) For the most part the preceding definitions are based on JIS C2560 "Ferrite Magnetic Core Regulations." W V L N2 1 μ 1 2 μ 1 --- μ 2 log 10 t2 t1 maximum value for 80% of the maximum value for 20% of the maximum value for Curie temperature (Tc) Temp [ °C] i μ i μ i μ フェライトコア5版_E 10.1.23 13:24 ページ 8 |
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