What is the material used for transformer lamination?
Lamination material for transformers is silicon steel, silicon steel is a kind of steel containing silicon (silicon is also called silicon), and its silicon content is between 0.8% and 4.8%. Silicon steel has the characteristics of high magnetic flux, low iron loss, low temperature rise, low no-load current, low noise, etc. The silicon steel can generate a large magnetic induction intensity in the energized coil.
Why silicon steel is used for the lamination of transformer?
Silicon steel was used as the core of the transformer because silicon steel is a magnetic substance with high magnetic permeability. It can produce a greater magnetic field in the energized coil, which can reduce the size of the transformer. The actual work of the transformer is in the AC state. The power loss is not only on the resistance of the coil, but also in the iron core magnetized by the alternating current. The power loss in the iron core is usually called “iron loss”. The iron loss is caused by two reasons, one is “hysteresis loss” and the other is “eddy current loss”. Hysteresis loss is the iron loss caused by the existence of hysteresis in the iron core during the magnetization process. The size of this loss is proportional to the size of the area enclosed by the material’s hysteresis loop. The hysteresis loop of silicon steel is narrow, and the iron core of the transformer with it has a small hysteresis loss, which can greatly reduce the degree of heat generation.
Lamination selection for transformer
Silicon steel sheets are usually divided into oriented silicon and non-oriented silicon. Toroidal transformers are made of oriented cold-rolled silicon steel sheets. 50/60HZ encapsulated transformers and open frame transformers are made of non-oriented silicon steel sheet.
What is the thickness of laminations used in a transformer?
The thickness of silicon steel sheet can be divided into: 0.21mm, 0.23mm, 0.27mm, 0.3mm and 0.35mm. Cold-rolled silicon steel sheets are used as transformers, and are usually 0.35mm thick. These sheets are cut into long slices to fit the iron core size, and then stacked into a “EI” shape or a “口” shape. Better quality is achieved by thinner silicon steel sheets, narrower splice strips, and smaller transformer volumes. The transformer is small, the eddy current loss is reduced, and the temperature rise is reduced, as well as its power consumption.
Purpose of lamination in transformers(reason for lamination in transformer)
Purpose of laminations in transformers is provide magnetic flux loop. Silicon steel creates an induced magnetic field outside bobbin, which generates an induced current with the coil, thus enabling voltage transformation.