Nowadays, the use of powder metallurgical iron cores is very extensive. In the process of application, many people have questions, such as why the powder metallurgical iron cores do not use the whole metal, hoping to be answered. Of course, this question can be answered in this article today.. The powder metallurgical iron core provides a flux path. In order to increase the magnetic conductivity of the magnetic path and reduce the eddy current loss of the iron core, thin Silicon steel sheets with insulators on the surface are used to make iron. Here's why the powder metallurgical core doesn't use a whole piece of metal:
Placing the massive metal in a changing magnetic field, by Maxwell's electromagnetic field theory, the changing magnetic field will generate a vortex electric field, so that the electrons in the metal will form a vortex current under the action of this vortex electric field, which we call Eddy current. Because the resistance of the whole metal is very small, Eddy currents are often strong. Therefore, it will cause a large amount of heat and waste a large amount of electricity.
Therefore, the usual powder metallurgical iron core is not made of a whole metal, but is made of Silicon steel sheets. Silicon steel is a steel with a small amount of Silicon, and its resistivity is greater than that of ordinary steel. The Silicon steel is made into thin sheets in order to use the insulating paint between the sheets to cut off the eddy current road, so that the eddy current is confined to the narrow sheet, further increasing the resistance and reducing the eddy current.
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