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FP1811-I-22 Datasheet(PDF) 7 Page - NEC |
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FP1811-I-22 Datasheet(HTML) 7 Page - NEC |
7 / 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 7 tan δ== = tan δ h + tan δ e + tan δ r = h1 × i + e 1 f + r1 Here Rm: loss resistance ( Ω) of the magnetic core alone Reff: loss resistance ( Ω) of the coil including the mangetic core Rw: loss resistance ( Ω) of the windings alone L: inductance (H) of the coil including the magnetic core V: magnetic core volume (mm) i: current (A) ω: angular frequency 2π f(rad/s) f: frequency (Hz) tan δ h : hysteresis loss factor tan δ e : vortex current loss factor tan δ r : residual loss factor h1: hysteresis loss coefficient e1: vortex current loss coefficient r1: residual loss coefficient However with ferrite, separate calculation of tan δ e and tan δ r is difficult, so it is convenient to express them together as follows. tan δ = tan δ h + tan δ f ●Relative loss factor tan δ / μi This refers to the value of the loss factor divided by the alternat- ing current initial magnetic permeability. = Note: The following formula applies when the magnetic circuit gap is small. with gap without gap ●Relative hysteresis loss factor h 10 As shown in the next formula, this refers to the value when h1=1000. h10 = h1 ●Relative temperature factor for initial magnetic permeability αμγ "Relative temperature factor for initial magnetic permeability" re- fers to the "temperature factor for initial magnetic permeability" divided by "initial magnetic permeability" μ 1 . αμ == . (T 2 > T1) αμγ = . (T 2 > T1) μ 1 : initial magnetic permeability at temperature T1 μ 2 : initial magnetic permeability at temperature T2 1 T2---T1 μ 2 --- μ 1 μ2 1 1 T2---T1 μ 2 --- μ 1 μ 1 αμ i μ i 3 2 ⎞ ⎟ ⎠ 1000 μ ⎛ ⎜ ⎝ ⎞ ⎟ ⎠ tan δ μ i ⎛ ⎜ ⎝ ⎞ ⎟ ⎠ tan δ μ e ⎛ ⎜ ⎝ μ"s ( μ's)2 tan δ μ i L V Reff---Rw ωL Rm ωL フェライトコア5版_E 10.1.23 13:24 ページ 7 |
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