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Commonly used transformer cores are generally made of silicon steel sheets. Silicon steel is a kind of steel containing silicon (silicon is also called silicon) with a silicon content of 0.8 to 4.8%. The core of the transformer is made of silicon steel because silicon steel itself is a magnetic substance with strong magnetic permeability. In the energized coil, it can produce a large magnetic induction intensity, which can reduce the volume of the transformer. The iron core is mainly composed of the iron core body, fasteners and insulating parts:
①The iron core body and magnetic conductor are made of electrical steel sheet.
② Fasteners, clamps, screws, glass lashing tapes, fresh lashing tapes and spacers, etc.
③Insulation parts, clip insulation, insulation pipes and insulation pads, grounding sheets and feet, etc.
Transformer core can be divided into
(1) Shell-type and core-type iron cores: The part of the iron core that covers the winding is called the "core column", and the part that does not cover the winding and only plays the role of the magnetic circuit is called the "iron yoke". Where the iron core surrounds the winding, it is called the shell type; where the winding surrounds the core column, it is called the core type. Shell type and 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 turn to a structure. Most of the transformer cores in our country use stacked cores.
(2) Single-phase and three-phase iron cores: Single-phase iron cores have single-phase two-column laminated iron cores. There are five types of single-phase single-column side yoke four-leg cores, single-phase double-column stacked cores, and single-phase radial stacked cores; three-phase cores include three-phase column-type stacked cores and three-phase side yoke-type five-column cores. There are four types of iron cores, three-phase double-frame laminated iron cores, and three-phase reactor laminated iron cores.
(3) Three-dimensional and planar: 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 flat core In the same plane as the iron yoke, it has high mechanical strength and good manufacturability.
(4) Laminated iron core and rolled iron core: Generally, they are laminated iron cores, which are formed by stacking iron cores. There are many forms of rolled iron cores. The air gap between the stem of the involute iron core and the iron yoke 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 chip perpendicularly, the additional loss is affected, so the chip width is not suitable Too large, that is, the capacity cannot be too large.
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