Specific characteristics and application of amorphous magnetic core
Amorphous magnetic core is used a lot at present, but I do not understand it here. I hope you can get your answers.
1, amorphous iron base;
2. Cobalt-based amorphous;
3. Fe-ni based amorphous;
4, ultrafine crystal;
Always feel nanocrystalline is ultramicrystalline, do not know right? There is this classification of amorphous magnetic core do not know right, there are no other amorphous magnetic core?
I first throw a brick, 1, iron based amorphous; Is now the largest output for distribution transformers; 2. Cobalt-based amorphous; The main base of the material is Co alloy. This material is very expensive because it contains Co. It is rarely used now, but now some special places are still used, such as some occasions requiring stress resistance. 3. Fe-ni based amorphous; It is usually said that nickel-based amorphous, because it contains relatively high nickel, so the price stability is poor, and the performance is basically surpassed by nanocrystalline, so now basically can not see. 4, ultrafine crystal; 5. Nanocrystalline; Remember the earliest time called ultramicro crystal, then nano hot, we all like to rely on the nano. I feel that they are basically the same, is the so-called minimum grain size problems.
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1, iron based amorphous, currently the most common in the market, is also the largest production of a class of amorphous. Fe-based amorphous alloy is composed of 80%Fe and 20%SiB metal elements, which has high saturation magnetic induction intensity (1.56T). The permeability, excitation current and iron loss of Fe-based amorphous alloy are superior to those of silicon steel sheet in all aspects, especially the low iron loss (1/3-1/5 of silicon steel sheet), and the use frequency is 50Hz--10KHz. 2. Cobalt-based amorphous; The main component of the material is also a large number of Co, because the price of Co is very expensive, so the output is not much, the main frequency of use in 20KHz-200KHz, 3, iron nickel based amorphous, because containing relatively high nickel, nickel price is also relatively high, and the fluctuation is relatively large, the performance is gradually surpassed by nanocrystals, so now the market volume is also relatively small. 4, ultrafine crystal; 5. Nanocrystalline; It can be said that ultramicrystals contain nanocrystals. Because of the superior performance of nanocrystals, and the increasing attention of the market, it is called nanocrystals later
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Iron base amorphous alloy: Amorphous alloy, or metallic glass, is a new material introduced in the 1970s. It is the use of quenching technology, the liquid steel is formed into a thin strip with a thickness of 30 microns. The obtained solid alloy (thin strip) is different from the cold rolled silicon steel material with regular arrangement of atoms in the crystal structure, it is this alloy whose atoms are in the irregular arrangement of amorphous structure. It has a narrow B-H circuit, with high magnetic conductivity and low loss characteristics; At the same time, the irregular arrangement of amorphous alloy atoms limits the free passage of electrons, resulting in a resistivity 2-3 times higher than that of crystal alloy, which is also conducive to reducing eddy current loss. Compared with the traditional transformer using silicon steel sheet, the no-load loss of the transformer core made of amorphous alloy is reduced by about 75%, so that the amorphous alloy transformer has a very significant energy saving and environmental protection effect. When the amorphous alloy transformer core is used in the oil-immersed transformer, it can obviously reduce a variety of harmful gases. Therefore, more and more manufacturers use amorphous alloy as the raw material of transformer core.
Cobalt-based amorphous alloy: cobalt-based amorphous alloy strip CoNiFeSiB has high permeability, low coercivity, very low core loss, and close to zero magnetostriction coefficient. It is not sensitive to mechanical stress, and can work in harsh environment for a long time, greatly improving the stability and reliability of product components. Magnetic amplifier, peak suppressor iron core high frequency switching power supply iron core magnetic shield, sensor iron core supermarket and bookstore anti-theft system labels ◇ common mode, differential mode inductor iron core constant conductive iron core.
With high permeability, low coercivity, very low core loss, and close to zero magnetostriction coefficient, not sensitive to mechanical stress, can work in harsh environment for a long time, greatly improve the stability and reliability of product components, especially suitable for military products applications.
Cobalt-based amorphous alloy strip CoNiFeSiB is mainly applied in some special directions:
Magnetic amplifier, peak suppressor core
◇ High frequency switching power supply core
Magnetic shield, sensor core
Supermarket and bookstore anti-theft system labels
◇ Common mode and differential mode inductor cores
◇ Constant conductive core
Reactor, output filter and energy storage inductor core
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Ferroco-based ultramicrystalline nanocrystalline Permoy current transformer iron core: amorphous: equivalent to 2605-S2, with high saturation magnetic induction, high permeability, low coercivity and low loss, low excitation current ultramicrystalline (nanocrystalline) : Equivalent to 1K107, with ultra-fine grain (10-20mm) structure, high initial permeability, high saturation magnetic sensitivity, low iron loss of cobalt based non-crystal: with high permeability, low coercivity, very low core loss, close to zero magnetostriction coefficient, insensitive to mechanical stress, greatly improve the stability and reliability of product components, especially for military products.
Iron core of Fe-Co based amorphous ultramicrystalline nanocrystalline Permoly current transformer:
Brand: (FeSiB equivalent to the American brand 2605-S2, other brands can be customized)
It has a series of advantages such as high saturation magnetic induction, high permeability, low coercivity, low loss, low excitation current, good temperature stability and low price.
Distribution transformer core
◇ medium frequency power transformer core
◇ Constant conductive core
PFC power factor correction and no air gap inductor core
Pulse transformer, AC/DC transformer core
Fe-ni based amorphous strip properties: high permeability, high sensitivity, low leakage rate, good flexibility, stable performance. Application: Harmonic, magnetic sound and asymmetric loop type anti-theft label.
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The microcrystalline core is made of microcrystalline strip with a grain size of a few microns, and the ultracrystalline core is made of ultra-crystalline (also known as nanocrystalline) strip with a grain size of about 10nm. Due to its high permeability under low magnetic density, the ultra-fine iron core can ensure that the transformer has a higher accuracy level in the low ratio current transformer. Moreover, due to its low saturation magnetic density, the measuring instrument has a low security factor to ensure that the measuring instrument will not be burned out due to high current. Therefore, the ultra-fine iron core is commonly used in current transformer. However, due to its high price, many manufacturers have repeatedly reduced the size of the core in order to save costs. As a result, the transformer is easily saturated when working, resulting in inaccurate measurement.
Amorphous alloy as a new type of energy saving soft alloy has been developed rapidly since it came into being in the 1970s. The manufacturing principle of amorphous alloy is through the use of super rapid cooling and solidification technology, from 1500 degrees of the parent alloy liquid fast cooling, at the glass transition temperature frozen into amorphous solid (metal glass), through the process control, can form a thickness of dozens of μm, width of thin strip. The resulting amorphous alloys are characterized by short-range order, long-range disorder, no grain boundary and no dislocation in atomic arrangement and combination, and thus have some unique properties that other soft magnetic alloys do not have, such as high saturation magnetic sensitivity, high permeability, high stability, low loss, high resistivity and so on. In the late 1980s, Japanese scholars Yoshizawa et al. were the first in the world to find that adding a little Cu, Nb. Mo and other elements into the matrix of iron based amorphous alloy, and forming a kind of ultra-fine grain soft magnetic alloy with bcc structure with excellent comprehensive performance under appropriate annealing temperature, which is nanocrystalline (also called ultramicrystalline) soft magnetic alloy. Thus opened the history of soft magnetic materials another milestone. After several decades of application and research, the technological properties and soft magnetic properties of amorphous and nanocrystalline soft magnetic alloys have been improved.
The strip thickness of ferro-based amorphous alloy is about 0.03mm. It is widely used in the core of distribution transformer, high-power switching power supply, pulse transformer, magnetic amplifier, intermediate frequency transformer and inverter. It is suitable for the use of frequency below 10kHz. Filter inductor, common mode inductor, differential mode inductor core.
Nanocrystalline has high saturation magnetic sensitivity (1.2T), high initial permeability (8×104), low Hc(0.32A/M), low high frequency loss (P0.5T/20kHz = 30W/kg) at high magnetic sensitivity, and a resistivity of 80μΩ/cm, higher than Permo alloy (50-60μΩ/cm). High Br(0.9) or low Br(1000Gs) can be obtained by longitudinal or transverse magnetic field treatment. It is the best material with comprehensive performance on the market at present; Applicable frequency range :50Hz-100kHz, the best frequency range :20kHz-50kHz. Widely used in high power switching power supply, inverter power supply, magnetic amplifier, high frequency transformer, high frequency converter, high frequency choke core, current transformer core, leakage protection switch, common mode inductor core.
Advantages of nanocrystalline: nanocrystalline materials also have the advantages of silicon steel, Permoly, ferrite. Namely: high magnetic induction intensity Bs; The saturation magnetic induction intensity Bs is 1.2T, which is twice that of Permoly and 2.5 times that of ferrite. The power density of the iron core is high, which can reach 15KW~20KW/Kg.
High permeability: static permeability up to 120,000 ~ 140,000. It's comparable to Permoly. The permeability of iron core used for power transformer is more than 10 times that of ferrite! The excitation power is greatly reduced and the efficiency of the transformer is improved. Low loss: in the frequency range of 20kHz~50kHz is 1/2~1/5 of ferrite.
Curie temperature is high: nanocrystalline Curie temperature is 570 degrees!