NGO Sheet Silicon Steel Transformer Coremagnetic EI Core
Factory direct NGO silicon steel sheet transformer magnetic EI core
Low frequency category: Silicon steel sheet (LAMINATION)
Silicon steel sheets are used in low-frequency transformers, and there are many types. According to different production processes, they can be divided into A: calcined (black sheet), N: non-calcined (white sheet). According to their different shapes, they can be divided into: EI , UI type, C type, mouth shape.
Mouth-shaped silicon steel sheet is often used in transformers with higher power. It has good insulation performance, easy heat dissipation, and short magnetic circuit. It is mainly used for transformers with power greater than 500 ~ 1000W and high power. A set of silicon steel sheets is composed of two C-type silicon steel sheets called CD-type silicon steel sheets. The power transformer made of CD-type silicon steel sheets under the same cross-sectional area, the higher the window.
The greater the power of the transformer. The coils can be installed on both sides of the iron core, so the number of coil turns of the transformer can be distributed on the two packages, so that the average turn length of each package is shorter and the copper consumption of the coil is reduced. In addition, if the two coils that require symmetry are respectively wound on the two coils, the effect of complete symmetry can be achieved. It is composed of four C-type silicon steel sheets and a set of silicon steel sheets is called ED-type silicon steel sheets. The transformer made of ED-type silicon steel sheets is flat and wide in shape. Under the same power conditions, ED-type transformers are shorter and wider than CD-type transformers. Larger, in addition, because the coil is installed in the middle of the silicon steel sheet and has an external magnetic circuit, the magnetic flux leakage is small and the overall interference is small. However, all of its coils are wound on a wire package, which is thicker, so the average turn length is longer , Copper consumption is greater.
The transformer with excellent C-type core performance has small size, light weight and high efficiency. From the perspective of assembly, there are few C-type silicon steel sheet parts and strong versatility, so the production efficiency is high, but the C-type silicon steel sheet processing process is more More, more complicated, and need to be manufactured with special equipment, so the current cost is still relatively high.
E-type silicon steel sheet is also known as shell-type or Japanese-type silicon steel sheet. Its main advantage is that the primary and secondary coils share a wire frame and have a higher window space factor (space factor Km: net cross-sectional area and window of copper wire Area ratio); the silicon steel sheet forms a protective shell for the winding, making the winding less susceptible to mechanical damage; at the same time, the silicon steel sheet has a larger heat dissipation area and less magnetic field dispersion from the transformer. However, its primary and secondary leakage inductance is larger and the external magnetic field interference is also greater. In addition, because the average circumference of the winding is longer, under the same number of turns and core cross-sectional area, the EI-type core transformer uses more copper wire.
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