There are many types of transformer iron cores, such as shell type and core type. The part of the transformer iron core with winding is called the "core column", and the part without winding that only functions as a magnetic circuit is called the "iron yoke". Where the iron core surrounds the winding, it is called a shell type; Any winding that surrounds the core column is called a core type. Shell type and core type have their own characteristics, but the manufacturing process of transformers determined by the iron core is very different. Once a certain structure is selected, it is difficult to switch to another structure.

A single-phase iron core has a single two column stacked iron core. There are five types of single-phase single column yoke type four column iron core, single-phase double column stacked iron core, and single-phase radiation stacked iron core; There are four types of three-phase iron cores: three-phase column stacked iron core, three-phase side yoke five column iron core, three-phase double frame stacked iron core, and three-phase reactor stacked iron core.

The transformer core can also be made into three-dimensional and planar designs. The three-dimensional core and yoke are not in the same plane, and there are radiation, involute, and symmetrical designs. Due to the relatively uniform distribution of magnetic flux, losses can be reduced; The flat core column and iron yoke are in the same plane, with high mechanical strength and good processability.

In addition, there are stacked iron cores and coiled iron cores, which are assembled by stacking iron cores. There are many forms of coiled iron cores. The air gap between the core column and the iron yoke of the involute iron core is large, which affects the no-load current, so the capacity cannot be made too small; However, due to the straight penetration of leakage flux into the plane of the iron chip, it affects the additional loss, so the chip width should not be too large, that is, the capacity should not be too large.

Article source: Transformer silicon steel sheethttp://www.cheungshun.com/