Iron core coil overlapping winding is a primary and secondary winding set in a certain order of alternation on the core column. Generally close to the iron yoke, low pressure winding is installed for ease of insulation. There are more gaps between the first and second windings of this winding, and the insulation is complex. The advantages are small leakage resistance, good strength, and convenient lead wire. Commonly used for low voltage, high current Transformers.
Iron core is composed of two parts: iron column and iron yoke. The core coil(winding) is mounted on the iron column, and the iron yoke is used to close the entire magnetic path. Here's what we need to know about the core coil:
The iron core coil is usually made of insulated copper wire. According to the position of the high and low pressure loops, they can be divided into two forms: concentric winding and overlapping winding.

　　The concentric winding is to set the primary winding and the secondary winding on the same iron core. The secondary winding is generally placed inside, and the winding is set outside at a time so that it can be insulated for treatment. However, for a transformer with a large output current, the secondary winding is complicated, and the secondary winding is often placed outside the primary winding. Concentric winding structure is simple, easy to winding. According to the different winding methods, concentric winding can be divided into cylindrical, spiral, continuous and tangled.
In practical industrial applications, the iron core coil usually uses an iterative winding. In order to reduce the hysteresis and Eddy current loss in the iron core, the iron core usually uses a Silicon content of about 5 % and a thickness of 0.35 to 0.50. And Silicon steel sheets coated with 0.01 to 0.13 thick Silicon steel sheet insulation paint on both sides are superimposed according to certain rules. The overlap of Silicon steel sheets is generally overlapping, that is, the Silicon steel sheets of the iron column and the iron yoke are staggered in layers and the core is clamped by the clamping device.
Iron cores can replace Silicon steel, Mohejin, and ferrite, as the main Transformers, control Transformers, wave inductors, energy storage inductors, reactors, and magnetic amplifiers in various forms of high-frequency switching power supplies. It is also widely used in a variety of transformer cores of similar accuracy. The performance of the iron core is derived from its manufacturing materials. Here we have a joint understanding of the manufacturing materials of the iron core.
The magnetic core is made of material. The material has high saturation magnetic induction, high magnetic conductivity, low coercive force, low loss, good stability, wear resistance, corrosion resistance, and low price. In all metal soft magnetic material core has the best price. Materials used to make microcrystalline iron cores are known as "green materials."
Due to the various properties of materials, magnetic cores are also widely used in various industries. Of course, magnetic cores have many uses that have not yet been discovered. I believe that in the near future, magnetic cores will shine in our lives.