TOROIDAL CORES : IRON POWDER CORES
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1 1 von :49 TOROIDAL CORES : IRON POWDER CORES Iron Powder Cores are made in numerous shapes and sizes: such as Toroidal Cores, E- cores, Shielded Coil Forms, Sleeves etc., each of which is available in many different materials. There are two basic groups of iron powder material: (1) The Carbon Iron and, (2) The Hydrogen Reduced Iron. The Carbonyl iron cores are especially noted for their stability over a wide range of temperatures and flux levels. Their permeability range is from less than 3 µi to 35 µi and can offer excellent 'Q' factors from 50 KHz to 200 MHz. They are ideally suited for a variety of RF applications where good stability and good 'Q' are essential. Also, they are very much in demand for broadband inductors, especially where high power is concerned. The Hydrogen Reduced Iron cores have higher permeabilities ranging from 35µi to 90 µi. Somewhat lower 'Q' can be expected from this group of cores. They are mainly used for EMI filters and low frequency chokes. They are also very much in demand for input and output filters for switched mode power supplies. The next several pages are devoted to iron Powder materials and the toroidal core configuration in particular. You will find physical dimensions of available items, their A L values and other magnetic properties, as well as how to select the proper core for your application. In general, toroidal cores are the most efficient of any core configuration. They are highly self- Shielding since most of the flux lines are contained within the core. The flux lines are essentially uniform over the entire length of the magnetic path and consequently stray magnetic fields will have very little effect on a toroidal inductor. It is seldom necessary to shield a toroidal inductor. The A L value of each iron powder core can be found in the charts on the next several pages. Use this A L value and the formuia beiow to CalcuIate the number of turns for a specific inductance. IRON POWDER TOROIDAL CORES (For Resonant Circuits) Material 0 Permeability1 Freq. Range 100MHz-300 MHz Color-Tan Core Number O.D. (inches) I.D. (inches) Hgt. (inches) A e 2 V e 3 A L Value µh/100 turns T T T T T T T T T T
2 2 von :49 T T T Note: Due to the nature of the '0' material, the inductance resulting from the use of the given A L value may vary greatly depending upon the winding technique. This may cause discrepancy between calculated and measured inductance. Material 1 Permeability20 Freq. Range 0.5 MHz-5 MHz Color-Blue Core Number O.D. (inches) I.D. (inches) Hgt. (inches) A e 2 V e 3 A L Value µh/100 turns T T T T T T T T T T T T T T T T Note: Most Cores can be very useful well below the lower frequency limit shown above. Material 2 Permeability 10 Freq. Range 2 MHz-30 MHz Color-Red Core O.D. I.D. Hgt. A e V e A L Value Number (inches) (inches) (inches) 2 3 µh/100 turns T T T T T T T T T
3 3 von :49 T T T T T T T T-200A T T-225A T T-300A T T-400A T Material 3 Permeability 35 Freq. Range 0.05 MHz-0.5 MHz Color-Grey Core O.D. I.D. Hgt. A e V e A L Value Number (inches) (inches) (inches) 2 3 µh/100 turns T T T T T T T T T T T T T T T T T-200A T Material 6 Permeability 8 Freq. Range 10 MHz-50 MHz Color-Yellow Core O.D. I.D. Hgt. A e V e A L Value Number (inches) (inches) (inches) 2 3 µh/100 turns T T
4 4 von :49 T T T T T T T T T T T T T T T-200A T Material 7 Permeability 9 Freq. Range 3 MHz-35 MHz Color-White Core O.D. I.D. Hgt. A e V e A L Value Number (inches) (inches) (inches) 2 3 µh/100 turns T T T T Material 10 Permeability 6 Freq. Range 30 MHz-100 MHz Color-Black Core O.D. I.D. Hgt. A e V e A L Value Number (inches) (inches) (inches) 2 3 µh/100 turns T T T T T T T T T T T Material 12 Permeability 4 Freq. Range 50 MHz-200 MHz Color-Green & White
5 5 von :49 Core Number O.D. (inches) I.D. (inches) Hgt. (inches) A e 2 V e 3 A L Value µh/100 turns T T T T T T T T T T T Material 15 Permeability 25 Freq. Range 0.1 MHz-2 MHz Color-Red &White Core O.D. I.D. Hgt. A e V e A L Value Number (inches) (inches) (inches) 2 3 µh/100 turns T T T T T T T T T T T T T T Material 17 Permeability 4 Freq. Range 20 MHz-200 MHz Color-Blue & Yellow Core O.D. I.D. Hgt. A e V e A L Value Number (inches) (inches) (inches) 2 3 µh/100 turns T T T T T T T T
6 6 von :49 T T T IRON POWDER TOROIDAL CORES TEMPERATURE COEFFICIENT CHARTS TYPICAL 'Q' CURVES Various windings, same core
7 7 von :49 The above chart shows typical Q curves resulting from a number of various windings on the same toroidal core. The next several pages contain a number of Q curves which were measured and plotted from actual windings. Inductance charts are given later on in this website which will help you choose a core for a specific inductance. Since the the charts are in increments of ten turns, a more precise turns-count can be calculated with the turns vs. inductance equation once the core has been selected. IRON POWDER TOROIDAL CORES Q-CURVES I
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19 19 von :49 Close Window Amidon Inc. 240 Briggs Ave. Costa Mesa, California USA Call Toll Free: or Fax: Web: Copyright Amidon, Inc.
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