Iron loss of Cold Rolled Non-Oriented Silicon Steel is one of the important indicators to measure its performance. Understanding the main factors that cause iron loss is of great significance for improving the quality of silicon steel and optimizing its application.
1. Hysteresis loss
Hysteresis loss is one of the main components of iron loss of Cold Rolled Non-Oriented Silicon Steel. It is the energy loss caused by the obstruction of the movement of the magnetic domain wall when the material is repeatedly magnetized in an alternating magnetic field. Hysteresis loss mainly depends on the shape and size of the hysteresis loop of the material. The narrower the hysteresis loop of silicon steel, the smaller the hysteresis loss. Factors affecting hysteresis loss include the chemical composition, crystal structure, grain size and processing technology of the material. For example, an increase in silicon content can reduce hysteresis loss because silicon can increase the resistivity of the material and reduce eddy current loss. It can also improve the magnetic properties of the material and narrow the hysteresis loop.
2. Eddy current loss
Eddy current loss is also an important component of iron loss of Cold Rolled Non-Oriented Silicon Steel. When the material is in an alternating magnetic field, eddy currents will be generated inside the material due to electromagnetic induction. When eddy current flows in the material, Joule heat is generated, resulting in energy loss. Eddy current loss mainly depends on the resistivity, thickness and frequency of the magnetic field of the material. The higher the resistivity, the thinner the thickness and the lower the frequency of the magnetic field, the smaller the eddy current loss. In order to reduce eddy current loss, methods such as using high resistivity materials, reducing the thickness of the material and reducing the frequency of the magnetic field can be used.
3. Abnormal loss
In addition to hysteresis loss and eddy current loss, Cold Rolled Non-Oriented Silicon Steel also has some abnormal losses. These abnormal losses are mainly caused by factors such as impurities, defects and stress in the material. For example, impurities in the material will cause local magnetic field unevenness, thereby increasing hysteresis loss and eddy current loss; defects in the material will cause local resistance to increase, thereby increasing eddy current loss; stress in the material will cause the movement of the magnetic domain wall to be hindered, thereby increasing hysteresis loss. In order to reduce abnormal loss, methods such as using high-purity materials, optimizing processing technology and performing appropriate heat treatment can be used.
4. Other factors
In addition to the above factors, the iron loss of Cold Rolled Non-Oriented Silicon Steel is also affected by some other factors. For example, factors such as temperature, magnetic field strength, and processing stress will have a certain impact on iron loss. Generally speaking, increased temperature will lead to increased iron loss, increased magnetic field strength will lead to increased iron loss, and increased processing stress will lead to increased iron loss. In order to reduce iron loss, these factors need to be controlled during use.
In short, the iron loss of Cold Rolled Non-Oriented Silicon Steel is mainly caused by factors such as hysteresis loss, eddy current loss, and abnormal loss. In order to reduce iron loss, it is necessary to optimize the performance of the material from the aspects of chemical composition, crystal structure, grain size, and processing technology of the material. At the same time, it is also necessary to control factors such as temperature, magnetic field strength, and processing stress during use to reduce the generation of iron loss.
