1. Three-dimensional and flat
The three-dimensional core and the iron yoke are not in the same plane, and there are radial, involute, and symmetrical types. Because the magnetic flux distribution is relatively uniform, the loss can be reduced; the planar core and the iron yoke are in the same plane, and the mechanical High strength and good workmanship.
2. Laminated iron core and wound iron core
Generally, they are stacked iron cores, which are stacked by iron cores. There are many forms of wound 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; but because the leakage magnetic flux enters the plane of the iron core vertically, it affects the additional loss, so the chip width is not suitable Too large, that is, the capacity cannot be too large.
3. Shell type and core type iron core
The part of the iron core that covers the winding is called "column", and the part that does not cover the winding and only functions as a magnetic circuit is called "iron yoke". Where the iron core surrounds the winding, it is called shell type; where the winding surrounds the stem, it is called core type. Shell type and core type have their own characteristics, but the transformer manufacturing process determined by the iron core is very different. Once a certain structure is selected, it is difficult to produce a structure. Most of the transformer cores in our country use the stacked core type.
4. Single-phase and three-phase iron cores
The single-phase core has a single-phase two-column laminated core. There are five types of single-phase single-column side-yoke four-column cores, single-phase two-column laminated cores, and single-phase radial laminated cores; three-phase stacking cores include three-phase column cores, three-phase side-yoke five-column cores There are four types of column iron core, three-phase double-frame laminated iron core and three-phase reactor laminated iron core.
