Abstract
The magnetic properties of non-oriented silicon iron alloys are strongly influenced by the cutting technology. Medium quality electrical steel M800-65A samples were cut through mechanical punching, laser, water jet and electro erosion technologies and were characterized with an industrial Single Strip Tester at the peak magnetic polarizations Jp of 0.5, 1 and 1.5 T, in the frequency range starting from 10 Hz to 200 Hz. The influence of the cutting technology on the energy losses and magnetic permeability was investigated.
Highlights
Non-oriented electrical steels have a crystalline texture, which is characterized through a very low magneto-crystalline anisotropy
It is well known that the electrical machines have an energy consumption of 50% from the worldwide electricity consumption and almost 6040 Mt of CO2 emissions are due to these devices
According to the newest regulations, it is expected that in 2030, without proper environmental decisions, the energy consumption of the electrical motors will increase until 13360 TWh/year and the emissions will be equal to 8570 Mt/year
Summary
Non-oriented electrical steels have a crystalline texture, which is characterized through a very low magneto-crystalline anisotropy. The magnetic cores of the electrical machines are prepared, by cutting the non-oriented alloys through mechanical punching, because this method is very fast and cheap, it generates inside the material mechanical stresses that affect the energy losses and the magnetic properties. This method is suitable to cut almost any type of steels and it has a narrow kerf width Physical properties such as melting point, thermal and electric conductivity, density have a limited importance, the hardness of the material could reduce the cutting speed. This process induces no heat affected zone and no hard oxidation layers on the cut edges, which could lead to the microcracks apparition. The non-conventional methods are adequate in the prototyping production
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