The role of the transformer core

2019-04-22 11:36:05 JuKe Technology (DongGuan) Co., Ltd. Read

Iron core (transformer core)

Commonly used transformer cores are generally made of silicon steel sheets. Silicon steel is a steel containing silicon (also known as bismuth), which has a silicon content of 0.8 to 4.8%. The core of the transformer made of silicon steel is because silicon steel itself is a magnetic material with strong magnetic permeability. In the energized coil, it can generate a large magnetic induction intensity, which can reduce the volume of the transformer. The induced current generated in the iron core circulates in a plane perpendicular to the direction of the magnetic flux, so it is called eddy current.

The role of the transformer core

The role of the transformer core.jpg

The actual transformer always works in the AC state, and the power loss is not only in the resistance of the coil but also in the core under the alternating current magnetization. Usually the power loss in the iron core is called "iron loss", and the iron loss is caused by two reasons, one is "hysteresis loss" and the other is "eddy current loss".
Hysteresis loss is the iron loss caused by the hysteresis phenomenon in the magnetization process of the iron core. The magnitude of this loss is proportional to the area enclosed by the hysteresis loop of the material. The hysteresis loop of silicon steel is narrow, and the core hysteresis loss of the transformer is small, which can greatly reduce the degree of heat generation.
Since silicon steel has the above advantages, why not use a piece of silicon steel as the iron core, but also process it into a sheet?
This is because the sheet core can reduce another type of iron loss - "eddy current loss". When the transformer is working, there is an alternating current in the coil, and the magnetic flux it generates is of course alternating. This varying magnetic flux produces an induced current in the core. The induced current generated in the iron core circulates in a plane perpendicular to the direction of the magnetic flux, so it is called eddy current. Eddy current losses also cause the core to heat up. In order to reduce the eddy current loss, the core of the transformer is laminated with silicon steel sheets insulated from each other, so that the eddy current flows through the narrow cross section to increase the electric resistance on the eddy current path; at the same time, the silicon in the silicon steel makes The resistivity of the material increases and also acts to reduce eddy currents.
As the core of the transformer, a 0.35mm thick cold-rolled silicon steel sheet is generally used. According to the size of the required core, it is cut into long pieces and then overlapped into a "day" shape or a "mouth" shape. In theory, if the eddy current is reduced, the thinner the thickness of the silicon steel sheet, the narrower the spliced strip, and the better the effect. This not only reduces the eddy current loss, reduces the temperature rise, but also saves the silicon steel sheet. But actually when making silicon steel sheet iron core. It is not only based on the above-mentioned favorable factors, because the iron core is produced in that way, the working time is greatly increased, and the effective cross section of the iron core is also reduced. Therefore, when using a silicon steel sheet to make a transformer core, it is necessary to weigh the pros and cons from the specific situation and choose the best size.
The transformer is made according to the principle of electromagnetic induction. There are two windings, one primary winding, and one secondary winding wound on the closed core post. When the original winding is connected to the AC mains voltage. The original Rao group has alternating current, and the magnetic potential is established. Under the action of the magnetic potential, the alternating main magnetic flux is generated in the iron core, and the main magnetic flux passes through the iron core at the same time.] The first and second windings are closed. Since the electromagnetic induction produces an induced electromotive force in the primary and secondary windings respectively, why can it boost and step down? Then it is necessary to explain the magnetic flux generated by the induced current, which always hinders the change of the original magnetic flux. When the original magnetic flux increases, the magnetic flux generated by the induced current is opposite to the original magnetic flux, that is, twice. The induced magnetic flux generated by the winding is opposite to the main magnetic flux generated by the primary winding, so that the secondary winding exhibits a low level of alternating voltage, so the core is the magnetic circuit portion of the transformer, and the winding is the circuit portion of the transformer.

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Dongguan Juke Industrial Development Co., Ltd. is a professional automation workshop production line solution provider for high frequency transformer peripheral equipment.

Juke Industry is dominated by Taiwanese technology, and all raw materials are selected and processed in strict accordance with Taiwan Standard Huai, and with the excellent technology and professional services to create maximum value for customers, and determined to become the world's high-frequency transformer automation equipment program The leading brand.
Juke Industry adheres to European standards, and its product series include: transformer inserting machine, ei type transformer inserting machine, transformer EI inserting machine, transformer core inserting machine, transformer automatic casing machine, automatic magnetic core assembly machine, (Full-automatic core assembly + bag tape + test + wobble plate), transformer winding machine, CNC winding machine, CNC coil winding machine, single-axis winding machine, multi-axis winding machine, 12-axis automatic winding Machine, automatic winding + tape machine, (USB charger automatic filming machine), automatic rubberizing machine, semi-automatic tape machine, vacuum impregnation machine, (with single and double cylinder difference), automatic soldering machine and semi-automatic Soldering machine (also called flip soldering machine), infrared tunnel furnace, ultraviolet curing oven, baking line and other high-frequency transformer peripheral automation equipment, products are widely used in high and low frequency transformers, ballasts and motor manufacturers. In order to meet the needs of the market, in 2008, in Yixiu District, Anqing City, Anhui Province, a group of professional and technical personnel to provide quality services to customers.

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