This study investigates the effects of different ambient temperatures on the electromagnetic properties of non-oriented silicon steel. The focus is on the changes in iron loss, magnetic induction, and permeability of 0.35 mm non-oriented silicon steel with silicon content ranging from 2.0% to 3.0% and temperatures from 30℃ to 120℃. Results show that when the temperature increases from 30℃ to 120℃, the iron loss P1.5/50 decreases by approximately 4.03%, the magnetic induction B50 decreases by approximately 6.83%, and the maximum permeability μm decreases by approximately 9.36%.
Non-oriented silicon steel with low iron loss and high magnetic induction can effectively improve motor performance and reduce motor losses. In recent years, with the increasing global emphasis on energy saving and environmental protection, and the promotion of variable frequency technology in motor miniaturization, high efficiency, and emerging industries, non-oriented silicon steel has developed rapidly. Silicon steel manufacturers employ strict production control measures in smelting, rolling, and heat treatment processes to obtain silicon steel materials with excellent electromagnetic properties. They also use professional magnetic measurement equipment to test magnetic induction and iron loss, providing data for motor design. However, numerous studies have shown that the accuracy and effectiveness of the results, whether for electromagnetic field distribution or loss distribution in magnetic materials, ultimately depend on the electromagnetic properties of the material under its actual working conditions. Currently, the electromagnetic performance data provided by silicon steel manufacturers, such as the iron loss and magnetization curves of non-oriented silicon steel sheets, are usually measured under laboratory standard conditions and cannot accurately reflect the actual operating state of the motor. To more accurately study the relationship between silicon steel materials and motor performance, it is necessary to study the magnetic characteristics of silicon steel materials at different temperatures. This study investigates the changes in the magnetic properties of non-oriented silicon steel at different temperatures ranging from 30℃ to 120℃.
The following conclusions are drawn:
(1) At 30-120℃, the iron loss of 0.35 mm non-oriented silicon steel with a silicon content of 2.0%-3.0% decreases with increasing temperature. At a test frequency of 50 Hz, the iron loss P1.5/50 decreases by approximately 4.03%;
(2) At 30-120℃, the magnetic induction of 0.35 mm non-oriented silicon steel with a silicon content of 2.0%-3.0% decreases with increasing temperature. This is mainly manifested in the applied magnetic field strength of 100 A/m to 1000 A/m, where the magnetic induction B50 decreases by approximately 6.83%;
(3) At 30-120℃, the permeability of 0.35 mm non-oriented silicon steel with a silicon content of 2.0%-3.0% decreases with increasing temperature. This is mainly manifested in the magnetic field range near 100 A/m, where the maximum permeability μm decreases by approximately 9.36%;
(4) At 30-120℃, at high frequencies, the iron loss of 0.35 mm non-oriented silicon steel with a silicon content of 2.0%-3.0% increases significantly, and the influence of temperature on iron loss is relatively significant, while the permeability decreases significantly, and the influence of temperature is relatively insignificant.
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