Nanocrystalline materials in the process of application in the inverter power supply, has appeared some issues such as noise, brittleness, consistency issues, etc., to a certain extent effect to the popularization and application, caused the attention. Now these problems have been solved step by step.

(a) the noise problem

The formation of the noise has various reasons:

1. The material itself is the cause of the magnetostrictive coefficient, the magnetostrictive coefficient of ferrite material is large, although the ferrite core is a solid, sometimes also can appear noise. Nanocrystalline composition is different, different magnetostriction coefficient, using a few years ago, is a kind of common alloy composition, thus make the noise problem of transformer is more outstanding, with the application and development is more and more, for different purposes by different alloy component, to meet the special requirements of different components on the magnetic. For example, as a power output transformer, current transformer, common mode inductor, etc., have developed a special ingredient. According to the requirement of the power transformer to adjust alloy composition, reduces the magnetostrictive coefficient, proved by users, noise problem has been greatly improved.

2. Iron core winding tightness reasons, has a lot to do with the quality and the use of strip and strip size deviation, uneven thickness can cause core winding is not tight, prone to noise. Good after adjusting component, molten steel flow, is advantageous to the strip shape quality, to reduce iron core noise to some extent, provides a favorable guarantee.

3. The inverter circuit, circuit of the dc component in the magnetic induction of core work, cause noise. Our experiments show that the noise increases with the increase of magnetic induction with work. Some manufacturer in circuit dc isolation measures were taken, using nanocrystalline core no noise problems for many years.

Through the above improvements, noise problem basically solved.

(2) the brittleness problem

The brittle main reaction in the core of the nanocrystalline core slag, reflect the biggest problem is users, not only is a headache thing to install operation, and easy to cause short circuit to circuit hidden trouble. After years of practice and research, brittle problem of composition, process adjustment, have been improved greatly. Composition is adjusted, the flexibility of the strip is improved significantly. Strip thickness thinning is also to reduce the brittleness. Addition on the manufacturing core technology, the core the antiseptic stress free glue, make the iron core is not easy and broken, thoroughly solved the iron core of slag of brittle problem. At the same time, due to the stress free glue layer of core strip fixed clearance, make its not easy to produce resonance, reduced the incidence of noise.

(3) the consistency problem

Consistency has to do with the scale of production, related to the capacity of production equipment. Look from the quality of the strip, a 500 kg of production equipment and production equipment 50 kg, also produce 500 kilograms of strip, obviously, the former product consistency in composition, magnetic "much better than the latter. Also, in the heat treatment is also in the process of production. So the production scale, great capacity of production equipment is good for consistency.

Nanocrystalline consistency in users, mainly displays in the saturation voltage and inductance large discreteness, sometimes more than doubled. Main reason is the difference in the effect of the magnetic field heat treatment, production inspection without sorting. With adjustment of ingredients used in power transformer, not only improve the brittleness, and reduces the residual magnetic induction strength of materials, therefore, the effect of increasing the magnetic field heat treatment, improve the iron core saturation voltage, has played an important role in the consistency of product.

Of the inverter power required by the magnetic, there is a gradual process, a few years ago, because the amount is small, only emphasize the loss is achieved. So, the performance test only loss that a parameter measurement. For a particular user, increase test induced voltage value. As the amount of application is more and more big, then put forward various demands, especially the consistency of performance requirements particularly outstanding. Due to the understanding of this requires a process, so no matter in composition improvement, production organization, testing standard and so on, have some lag. Therefore had certain influence to the popularization and application. Now the problem get enough recognition and taken various effective measures, consistency has been greatly improved.

(4) price

Price is the most concerned, users especially ready to use or are just beginning to use the user. Price and output has a direct relationship, in recent years, with more and more widely in the application of nanocrystalline iron core fields, not only used in inverter welding machine, and a large number of used in electrolytic plating equipment, induction heating equipment, charging equipment, communication power supply, UPS power supply, X optical source, laser power, frequency control of motor speed, power and other fields, production is more and more big, the price also have a significantly lower, the current price is the initial price has fallen by about 40%, as are increasing, the price will be more and more low, the price of the nanocrystalline will be more and more close to the price of the ferrite.

Now for more than 15 kw high-power power supply, actually the price of the nanocrystalline core is below the ferrite core. Due to limited the size of the ferrite core, power required for transformer core is difficult to solve, have to use several core to meet the power requirements. The nanocrystalline core a. Look from the unit price, ferrite much cheaper, but a few core price is higher than the price of the nanocrystalline core.

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