Abstract
The cutting process of silicon steels is a necessary manufacturing technique in electrical equipment. Different cutting methods have different effects on the internal structure and magnetic properties of the electrical steel sheets. Laser cutting can produce thermal stress during processing, while mechanical cutting may cause plastic deformation near the cutting edge, which both lead to deterioration in the magnetic properties of the material. Therefore, studying the effect of different cutting techniques on magnetic properties is of great significance to accurately predict the iron losses of electrical equipment. In this paper, a mobile B-H sensing structure is designed to sense the distribution of local magnetic properties near the cutting edges. Magnetic properties of the non-oriented (NO) silicon steel samples B35A270 and 50JN470 are measured and characterized with the variation of distance from cutting edges. The results demonstrate that the deterioration of magnetic properties depends on the cutting methods and the material characteristics. Wire cutting has little effect on magnetic performance and the effect can be observed near the cutting edge. As a contrast, the decrease of the relative magnetic permeability can be observed in a deeper width of the steel strips cutting by laser. Moreover, the multiple trends of laser cutting loss which vary with cutting depth are compared and discussed. This research can provide a reference for the application of electrical equipment under actual working conditions.
Highlights
Magnetic cores of electrical machines and power transformers are often affected by different manufacturing steps such as punching, bending, cutting, stacking or welding during the production process
A large number of studies have shown that the material will produce mechanical stress during the cutting process, which determines the increasing in total loss and the decreasing in permeability
The high temperature generated by laser cutting resulting in higher magnetic permeability near the edge may promote the growth of grains in this area, while wire cutting mainly cause the plastic deformation and the stress field near the edge and make the cut edge harder to magnetize
Summary
Magnetic cores of electrical machines and power transformers are often affected by different manufacturing steps such as punching, bending, cutting, stacking or welding during the production process. By comparing and evaluating the effects of different manufacturing processes on the deterioration of the magnetic properties, it comes out that the cutting influence is the most harmful.. A large number of studies have shown that the material will produce mechanical stress during the cutting process, which determines the increasing in total loss and the decreasing in permeability.. Scitation.org/journal/adv magnetic properties affected by cutting is difficult. Different cutting has different effects on the permeability and loss of different silicon steel sheets, which is a subject that needs to be analyzed and compared. Different cutting methods were measured at magnetic flux density of 0.7T, 1.0T, 1.3T. The frequency f at measurements varies from 50 to 200 Hz
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