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On the one hand, the eddy current can be isolated, and the data is suitable for higher frequencies; on the other hand, due to the gap effect between particles, the data has low magnetic permeability and constant magnetic permeability; and because of the small particle size, basically no skin phenomenon occurs. The magnetic permeability varies with frequency and is relatively stable; in addition, powder cores can be prepared into special-shaped pieces of various shapes for use in different fields; finally, industrially damaged strips can be crushed into magnetic powder, and then made into magnetic powder cores , Which can reduce losses and increase the use value of data. The magnetoelectric performance of magnetic powder core mainly depends on the magnetic permeability of the powder material, the size and shape of the powder, the filling factor, the content of the insulating medium, the forming pressure and the heat treatment process. The soft magnetic powder core will still follow the high Bs, high μ, high Tc and low Pc in the future. The magnetic powder core is a soft magnetic material made of ferromagnetic powder and insulating medium. Because the ferromagnetic particles are very small (0.55μm used at high frequency and separated by non-magnetic electrical insulating film material. Low Hc and high frequency, miniaturization and thinning are developed to meet the increasing thin film and thinning of magnetic components. The trend of miniaturization and even integration.
The magnetic permeability is high, and the nanocrystalline Fe73.5Cu1Nb3Si13.5B9 alloy has high saturation magnetic induction. The characteristics of good stability, and the material becomes brittle after heat treatment, easy to process into alloy powder. It is possible to use the alloy powder to make a new type of ultra-microcrystalline magnetic powder core. Compared with the nanocrystalline magnetic core wound with tape, the magnetic permeability of the nanocrystalline magnetic powder core is still very low, and the soft magnetic performance is unstable. The current problems that need to be solved urgently: 1. Effectively control the growth of nanocrystals during heat treatment; 2. Forming problems of magnetic powder cores; 3. Influence of thermal treatment specifications on the soft magnetic properties of magnetic powder cores.
Noise is the main source of circuit interference in many power electronic equipment. Various filter components must be used to reduce noise. Magnetic powder cores play a key role in the filter as the main component of the differential mode inductor. In order to obtain a better filtering effect, the magnetic powder core material is required to have the following performance characteristics: high saturation magnetic induction, wide constant permeability characteristics, good frequency characteristics, good AC and DC superimposition characteristics and low loss characteristics. In response to the above requirements, we have successively developed iron powder cores, notched amorphous alloy iron cores, iron-nickel aluminum powder cores (MPP powder cores) and other soft magnetic materials for inductors. These materials have exerted their respective advantages and advantages under different application conditions. effect. At present, UP powder cores occupy a major share in the high-end market. However, due to the complicated manufacturing process of M, powder cores and the high price of raw materials, the price of powder cores remains high and the scope of application is subject to certain restrictions. In recent years, iron-based nanocrystalline soft magnetic powder cores have attracted much attention due to their low price, simple preparation process, and excellent performance. Research on them is quite active. It is expected to replace the local use of UP powder cores and be applied in the high-frequency field.
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