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FP0905-I-22 Arkusz danych(PDF) 6 Page - NEC |
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FP0905-I-22 Arkusz danych(HTML) 6 Page - NEC |
6 / 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 6 Terms and Definitions ●Alternating current initial magnetic permeability μi At the initial magnetization curve's origin point, the magnetic permeability of the magnetic core is used as shown in the formu- la below. μ i = Here μ 0 : vacuum magnetic permeability H : alternating current magnetic field strength (A/m) B : alternating current magnetic flux density (T) ●Effective magnetic permeability μ e In the magnetic core of a closed magnetic circuit (one in which flux leakage can be ignored), this refers to the magnetic perme- ability indicated in the following formula through the effective self-inductance. Here L : effective self-inductance (H) N : Number of all windings M: Magnetic path lengths (cm) of each of the same mate- rials and same cross-section areas A : Each of the cross-section areas (cm2) μ : Each of the materials' magnetic permeabilities Note : The first formula is used in measurement and the second in calculating when the dimensions and magnetic permeabilities of each part of the magnetic core are given. ●Effective saturation magnetic flux density Bms(G ; T) This refers to the saturation magnetic flux density in actual use. B10 : Bms with magnetic field 10 Oe (796A/m) B15 : Bms with magnetic field 15 Oe (1194A/m) ●Effective saturation residual coercive force Brms(G ; T) This refers to the magnetic flux density when the magnetic field is removed from the condition of effective saturation magnetic flux density. ●Effective saturation coercive force Hcms(Oe ; A/m) When the magnetic field is removed from the condition of effec- tive saturation magnetic flux density and further magnetized in the opposite direction, this refers to the strength of the magnetic field in which the magnetic flux becomes 0. ●Loss factor tan δ This refers to the hysteresis loss factor, vortex current loss fac- tor and residual loss factor. The hysteresis loss coefficient (h1),vortex current loss coefficient (e1) and residual loss coeffi- cient (r1) are represented by the following formula. B H lim H 0 1 μ 0 m = tan m B m θ i = tan i H θ i μ θ μθ Ba : saturation magnetic flux density Bms : effective saturation magnetic flux density Bm : maximum magnetic flux density Brs : saturation residual magnetic flux density Brms : effective saturation residual magnetic flux density Br : residual magnetic flux density B Hcs : saturation coercive force Hcms : effective saturation coercive force Hc : coercive force Hms : effective saturation magnetic field strength Hm : maximum magnetic field strength Bs Bms Brs Bm Br Hcs Hcms Hc Hm Hcms Hms H ∞ H Brms Hc μ e = L ×10 9 4 πN 2 ⋅ R A ∑ μ e = R A ∑ / R μ A ∑ フェライトコア5版_E 10.1.23 13:24 ページ 6 |
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