If the strength of the rolling mill is relatively strong in the casting process, it can be allowed to dissolve after the precipitation, so that the particles after hot rolling annealing are refined, and the temperature is a little higher when the final rolling, which can prevent the crystallization from coarser and reduce the loss to a minimum. For non-oriented electrical steel, because it has higher deformation resistance and lower thermal conductivity, there will be some tile-like defects on the surface of the product, and internal and external cracks are easy to occur, so it is necessary to slowly cool and slowly heat.

According to the magnitude of magnetic induction, oriented eletrical steel can be further divided into high magnetic induction oriented eletrical steel (Hi-B) and general oriented eletrical steel (CGO). The oriented eletrical steel with magnetic inductance of less than 1.88T is called general oriented eletrical steel (CGO), and the oriented eletrical steel with magnetic inductance greater than or equal to 1.88T is called high magnetic inductance oriented eletrical steel (Hi-B). Generally, the high magnetic inductance oriented eletrical steel has lower iron loss performance, and can reduce the loss during the energy conversion process when used as the transformer iron core.

In addition to the normal annealing of the hot rolled coil, the cold-rolled electrical steel strip also needs to undergo various forms of heat treatment several times after cold rolling. Intermediate decarburization annealing, work hardening elimination annealing, magnesium oxide isolation coating drying treatment, high temperature circular furnace and shroud furnace annealing, tensile heat leveling annealing, finished product annealing and insulation layer drying sintering treatment.

In order to achieve this goal, electric vehicle iron core usually adopt a laminated or stacked structure, consisting of many sheets or sheets. This design can reduce the eddy current loss in the iron core, increase the path length of the magnetic flux, increase the magnetic resistance, and thus reduce the magnetic flux leakage loss. In addition, the core usually has a special shape and groove to accommodate the coil and ensure that the magnetic field can be efficiently transmitted between the rotor and the stator.

In addition, in the operation of the transformer, the winding has a strong magnetic field around, the iron core, metal structure, parts, components, etc., are in a non-uniform magnetic field, their distance from the winding is not equal, so the metal structure, parts, components and other magnetic field induction generated by the electromotive force size is also not equal, there is a potential difference between each other.

Thinner electrical steel materials, including super electrical steel materials, to reduce the iron loss of the core to a greater extent.

Silicon steel magnesium oxide is a small particle size, good suspension in water, low hydration rate, with a certain particle size distribution range of white powder, is a special magnesium oxide products, mainly used in the production of oriented silicon steel sheet, in its high temperature annealing stage, so that iron metal atoms into a regular orientation, to isolate and prevent sintering, remove sulfur and phosphorus in silicon steel impurities, but also with the surface of silicon steel The silicon reaction forms an excellent insulating film. In order to ensure the quality of magnesium oxide coating,

In the inspection of the motor, it is often found that the performance indicators of the sample during the product trial identification meet the drawing and product requirements, but in the production of different manufacturers or the same manufacturer, the product performance of different batches fluctuates greatly, and the analysis is caused by the instability of the design and manufacturing quality of the chip and the iron core.