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The comparison of amorphous and nanocrystal alloys

2010年02月06日 15:38 Click 3695

Iron-base amorphous alloys are competing with silicon steel in the field of frequency and medium frequency. Iron base amorphous alloy and silicon steel have the following advantages and disadvantages.
1) the saturated flux density of the ferrous amorphous alloy is lower than that of silicon steel
However, in the same Bm, the loss of an iron base amorphous alloy is less than 3% of the thickness of silicon steel. The reason that the average person thinks the loss is small is that the alloy is thin and the resistivity is high. This is just one aspect, the main reason is that more iron base amorphous alloy is amorphous, atomic arrangement is random, there is no atom of orientational magnetocrystalline anisotropy, there is no local deformation and the migration of grain boundary. Therefore, the energy barrier that impedes the movement of the domain wall and the rotation of the magnetic moment is very small, has unprecedented soft magnetism, so the permeability is high, the resistance is small and the loss is low.
2) the filling coefficient of the iron-base amorphous alloy is 0.84 ~ 0.86
3) the magnetic flux density of the ferronon-crystalline magnetic core
1.35 T ~ 1.40 T. Silicon steel is 1.6 T ~ 1.7 T. The weight of the iron-base amorphous alloy is about 130% of the weight of the electric transformer. However, even if the weight is heavy, for the same capacity, the core of the magnet is used for the loss of the iron-base amorphous alloy, which is 70% ~ 80% lower than that of silicon steel.
4) considering losses, the overall assessment is 89%
Assuming that the load loss (copper loss) of the industrial transformer is the same, the load rate is 50%. So, to make the power frequency transformer silicon steel iron loss and the iron base amorphous alloy transformer, power frequency, silicon steel is the weight of the iron base amorphous alloy transformer 1? Eight times. As a result, the domestic some identity aside transformer loss level, generally talking about the weight of the iron base amorphous alloy transformer power frequency, cost and price, power frequency transformer silicon steel is 130% ~ 150%, does not meet the requirements of the market principle of cost performance. Abroad put forward two methods of comparison, one is under the condition of depletion of the same, and the two kinds of power frequency transformer used in copper and iron material, weight and price comparison. Another method is to reduce the amount of wattage of the iron base amorphous alloy operator frequency transformer, which is converted into a currency to compensate. The cost of each watt is $5 to $11, equivalent to 42 to 92 yuan. The cost of each watt load was reduced to $0.7 to $1.30, equivalent to rmb6 to 8.3 yuan. For example, a 50Hz, 5kVA single-phase transformer with a silicon steel core, is quoted for $1, 700. The empty loss of 28W, at rmb60 per W, is 1680 yuan; Load loss 110W, 8 yuan per W meter, 880 yuan; The overall assessment is 4,260 yuan. It is quoted for 2500 yuan (RMB) per Taiwan. The loss of 6W, or 6W, is 360 yuan. The load loss is 110W, which is 880 yuan, and the total appraisal is 3,740 yuan. If the loss is not considered, the single-count price, 5kVA iron non-crystalline alloy operator frequency transformer is 147% of the electric transformer of silicon steel. If the loss is considered, the overall assessment is 89%.
5) iron-base amorphous alloys are more powerful than silicon steel
The loss of the magnetic core material of the test power transformer is now under the sine wave voltage which is less than 2%. The actual power grid distortion was 5%. In this case, the loss of iron-base amorphous alloys increased to 106% and the loss of silicon steel to 123%. If the higher harmonic is large, the distortion of 75% (such as power frequency rectifier transformer), under the condition of iron base amorphous alloy loss increased to 160%, increased to more than 300% loss of silicon steel. It is indicated that the strength of the iron-base amorphous alloy is stronger than that of silicon steel.
6) the magnetostrictive coefficient of the ferrous amorphous alloy is large
It's three to five times more than silicon steel. As a result, the noise of the iron-base amorphous alloy frequency transformer is 120% of the noise of the silicon-steel frequency transformer, which is 3 ~ 5dB.
7) the price of iron-base amorphous alloy is 150% of mm3 % oriented silicon steel
In the current market, it is 0.15 mm3 % oriented silicon steel (through special processing) around 40%.
8) iron-base amorphous alloy annealing temperature is lower than silicon steel
Iron-base amorphous alloy annealing temperature is lower than silicon steel and energy is small, and the iron-base amorphous alloy core is made by specialized manufacturing plant. The silicon steel core is manufactured by the transformer manufacturing plant. According to the above comparison, as long as the scale of production is reached, the electronic transformer of iron base amorphous alloy will replace some silicon steel market. In the range of 400Hz to 10kHz, iron-base amorphous alloys will replace most of the silicon-steel market with a thickness of 0.15 mm, even if there are new types of silicon steel. It is worth noting that Japan is vigorously developing FeMB amorphous alloys and nanocrystalline alloy, the Bs can reach 1.7 ~ 1.8 T, and loss of existing amorphous alloys FeSiB is below 50%, if used in electronic transformer, power frequency magnetic flux density is 1.5 T work above, the loss is only 10% ~ 15% of silicon steel power frequency transformer, power frequency transformer silicon steel will be more powerful competitors. In 2005, Japan is expected to successfully pilot the FeMB non-crystalline alloy operator frequency transformer and put it into production.
 
Amorphous nanocrystalline alloys are competing with the soft ferrite in the medium and high frequency domain. In 10 KHZ to 50 KHZ electronic transformer, the work of iron-based nanocrystalline alloy magnetic flux density of 0.5 T, loss P0.5 20 k / 25 w/kg or less, therefore, have obvious advantages in the high power electronic transformer. In the 50kHz to 100kHz electronic transformer, the iron-base nanocrystalline alloy loss P0.2/100k is 30 ~ 75W/kg, and the iron-base amorphous alloy P0.2/100k is 30W/kg, which can replace some of the ferrite market.

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