The earliest material used for Transformer iron cores was soft wrought iron that was easily magnetized and demagnetized. The transformer iron core was made of wire, not a whole piece of iron. In order to overcome the magnetic resistance loss caused by periodic magnetization in the magnetic loop and the eddy current generated by the alternating flux cutting of the core. The core made of wire beam can effectively reduce the cross-sectional area of Eddy current path.
In about 1900, it was found that adding a small amount of Silicon or aluminum to iron can greatly reduce the magnetic loss, increase the permeability, increase the resistivity, and reduce the eddy current loss. After many improvements, the party used 0.35 M thick Silicon steel sheets to replace the wire to make Transformer cores.

　In recent years, all countries in the world have been actively studying and producing energy-saving materials. The iron core material of Transformers has been developed to the latest energy-saving material, amorphous magnetic material 2605S2, and amorphous alloy iron core Transformers have emerged. The iron loss of a transformer made of 2605SS 2 is only 1/5 of that of a Silicon steel Transformer, and the iron loss is greatly reduced.
With the development of the economy, the motor industry has also risen rapidly, and a large number of high-tech products have emerged. The fixed rotor core plays an important role as an essential part of the motor. The following is a description of its iterative principle:
The stator core is generally composed of 0.5 mm thick D41 Silicon steel sheets, each with a thickness of 3-6 mm. A 10mm wide ventilation tank is left between the section and the section. The center of the iron is pressed with a special non-magnetic pressure plate. Fixed on the base. Because the rotor speed of the steam turbine generator is high, its rotor is made of a single piece of high-strength alloy steel with good magnetic conductivity. The groove is milling at the extreme distance of the rotor. The excitation winding is stuck in the groove and forms the main magnetic pole of the generator with the unslotted part. In our country, the synchronous generator generally adopts the rotating armature type, so the excitation current of the generator supplies power to the rotor through the condenser ring of the rotor, forming a magnetic pole on the rotor. That's when you said the rotor was magnetic. When the prime motive drives the rotor to rotate, the result is that the magnetic pole on the armature is rotating, and the winding on the stator cuts the magnetic pole of this rotation to produce an alternating current, and the external output forms alternating current. If there are three groups of windings that are evenly distributed in space, the three-phase alternating current is output. The frequency of alternating current is related to the armature speed and pole number.
The empty load loss in Transformer losses, namely iron loss, mainly occurs in the transformer core stack, which is mainly due to the loss caused by the alternating magnetic lines generating hysteresis and Eddy currents through the core.
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The above is about the introduction of the rotor core, hope to help you, if you want to know more content, please pay attention to our website, thank you for your support.