The silicon steel sheet is essentially an extremely low carbon steel sheet with a mass fraction of silicon of 0.5% to 5%.
Classification of silicon steel sheets
Silicon steel sheets can be divided into motor silicon steel sheets (the mass fraction of silicon is usually below 2.5%, and the thickness is generally 0.5 ram) and transformer silicon steel sheets (the mass fraction of silicon is usually 2.5% to 4.5%). , the thickness is generally O.35mm);
According to the production method, it can be divided into hot-rolled silicon steel sheet and cold-rolled silicon steel sheet. And cold-rolled silicon steel sheets can be divided into oriented silicon steel sheets (used to make transformers) and non-oriented silicon steel sheets (used to make motors) according to the degree of grain orientation;
According to the working conditions, it can be divided into silicon steel sheets used in strong magnetic fields (mostly used in the power industry, which is the most common and the largest) and silicon steel sheets used in weak magnetic fields (mostly used in the telecommunications industry), and those used under power frequency of silicon steel sheets and silicon steel sheets used at high frequencies.
For silicon steel sheets used at high frequencies, in order to reduce the eddy current loss at high frequencies, O. The thickness of 1 ~ 0.2ram, and those used for pulse transformers can be as thin as 0.05mm or less.
The magnetic directionality and (110) L001J~ easy magnetization axis [100] of the iron single crystal are parallel to the rolling direction, and the (110) plane is parallel to the rolling plane, then the magnetic induction of the silicon steel sheet along the rolling direction is the highest, with ( 110) The grain-oriented organization of [001] is called Gaussian texture. This directional silicon steel is called grain-oriented silicon steel or grain-oriented silicon steel.
Oriented silicon steel is used in transformers, and the higher the degree of orientation, the better. This is because the higher the degree of orientation, the smaller the magnetostriction (the so-called magnetostriction is the phenomenon that ferromagnetic substances expand or contract during magnetization, which is the main reason for the noise of the transformer), the more magnetic the silicon steel sheet is good, and the iron loss is reduced. Non-oriented silicon steel is used in motor manufacturing.
