Abstract
The effect of uniaxial stress on iron losses of M400-50A grade non-oriented electrical steel sheets cut by punching process is experimentally studied. Samples cut along the rolling and transverse directions and having different number of cutting edges are used for this purpose. Measurements are carried out in the range of 10–100 Hz frequency of sinusoidal excitations at different magnetization levels under varying uniaxial stress by using a single sheet tester. The iron losses are obtained from the measurements and comparative analyses are made for different cases. The study shows that the effect of stress on the iron losses of the punched samples varies depending on the degradation level that the samples have after the cutting process. By considering this varying effect, when the combined effect of stress and punching is analyzed, it is observed that the iron losses increased up to 55.2% under compressive stress. It is also observed that the increase in the losses due to the effect of cutting can be recovered by applying tensile stress.
Highlights
Electrical steel sheets are usually cut to specific shapes by different techniques during the manufacturing process for appropriate usage in electrical machine parts
The measurement results of the samples cut by punching process and subject to different uniaxial stress levels are presented throughout the paper in detail
The combined effect of stress and punching on the iron losses were discussed. This is the first study showing the effect of stress on the iron losses of the punched samples and taking the combined effect of stress and punching into account together
Summary
Electrical steel sheets are usually cut to specific shapes by different techniques during the manufacturing process for appropriate usage in electrical machine parts. These processes cause degradation in the magnetic properties of the electrical steel sheets and increase the iron losses [1,2,3]. In addition to the residual stress introduced by manufacturing processes, materials are subjected to additional mechanical stress due to the operating conditions of the machines [4,5,6]. Punching presents a faster cutting rate for the electrical steel sheets used in electrical machines
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