The part of the core winding in the shell and core core is called the "heart column", and the part without the winding that acts as the magnetic circuit is called the "iron yoke". Where the core surrounds the winding, it is called the shell type; where the winding surrounds the heart column, it is called the core type. The shell type and the core type have their own characteristics, but the transformer manufacturing process determined by the iron core is quite different. Once a certain structure is selected, it is difficult to produce a structure. Most of our transformer cores use laminated cores.
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The single-phase and three-phase core single-phase iron cores have a single two-pillar core. Single-phase single-column yoke type four-post iron core, single-phase two-column type iron core, single-phase radiation type iron core stacked five kinds; three-phase iron core has three-phase column type iron core, three-phase yoke type five-column There are four kinds of iron cores, three-phase double-framed stacked iron cores, and three-phase reactor stacked iron cores.
The three-dimensional and planar three-dimensional heart stem and the iron yoke are not in one plane. They are radiant, involute, and symmetric. The magnetic flux distribution is relatively uniform and the loss can be reduced. The planar stem and the iron yoke are In the same plane, the mechanical strength is high and the processability is good.
The stacked iron core and the rolled iron core are generally stacked iron cores stacked by a core. Roll cores are in many forms. The air gap between the core of the involute core and the iron yoke is large, affecting the no-load current, so the capacity can not be too small; but due to the leakage flux perpendicular to the plane of the iron chip, the additional loss is affected, so the width of the sheet is not suitable If it is too large, the capacity cannot be too large.
Iron core is mainly composed of iron core body, fasteners and insulation parts:
1 Core body, magnetic conductor, made of electrical steel sheet.
2 fasteners, clips, screws, glass tie band, just tie band and pads and so on.
3 Insulation parts, clip parts insulation, insulation tubes and insulation mats, grounding strips and feet, etc.