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Effect of Ambient Temperature on Magnetic Properties of Non-oriented Silicon Steel

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  The effects of different ambient temperatures on the electromagnetic properties of non-oriented silicon steel were studied. The changes of steel loss, magnetic induction and magnetic permeability of 0.35 mm non-oriented silicon with the ambient temperature in the range of 30-120 °C and the content of silicon in the range of 2.0%-3.0% were studied. The results show that when the temperature is raised from 30 °C to 120 °C, the iron loss P1.5/50 decreases by about 4.03%, the magnetic induction B50 decreases by about 6.83%, and the maximum magnetic permeability μm decreases by about 9.36%.
  Non-oriented silicon steel with low iron loss and high magnetic induction performance can effectively improve motor performance and reduce motor loss. In recent years, with the increasing emphasis on energy conservation and environmental protection around the world, the introduction of variable frequency technology in the miniaturization, high efficiency of electric motors and the promotion of emerging industries, non-oriented silicon steel has been rapidly developed. Silicon steel manufacturing enterprises use strict production control methods to obtain excellent electromagnetic properties of silicon steel materials from various processes of smelting, rolling and heat treatment, and use magnetic measuring equipment to conduct magnetic induction and iron loss testing to provide motor manufacturing enterprises. The basis of motor design. However, a large number of studies have shown that the accuracy and effectiveness of the results, whether in the electromagnetic material distribution or loss distribution in the magnetic material, ultimately depends on the electromagnetic properties of the material under its actual working conditions. At present, the electromagnetic performance data provided by silicon steel manufacturing enterprises, such as the iron loss and magnetization performance curves of non-oriented silicon steel sheets, are usually measured under the conditions specified by the laboratory standards, and cannot truly reflect the true state of the motor operation, in order to be more accurate. The relationship between silicon steel materials and motor performance is studied. It is necessary to study the magnetic properties of silicon steel materials at different temperatures. The variation of magnetic properties of non-oriented silicon steel was studied at different temperatures ranging from 30 to 120 °C.
 
  The following conclusions were obtained:
  (1) At 30-120 ° C, the loss of 0.35 mm non-oriented silicon steel with a silicon content of 2.0% to 3.0% decreases with increasing temperature. At the test frequency of 50 Hz, the iron loss P1.5/50 decreases by about 4.03%. ;
  (2) At 30-120 ° C, the magnetic induction of 0.35 mm non-oriented silicon steel with a silicon content of 2.0% to 3.0% decreases with increasing temperature, mainly at the applied magnetic field strength of 100 A/m to 1000 A/m. Sense B50 decreased by about 6.83%;
  (3) At 30-120 ° C, the magnetic permeability of 0.35 mm non-oriented silicon steel with a silicon content of 2.0% to 3.0% decreases with increasing temperature, mainly in the vicinity of the magnetic field range of 100 A/m, and the maximum magnetic permeability μm Decreased by approximately 9.36%;
  (4) At 30-120 ° C, the iron loss of 0.35 mm non-oriented silicon steel with a silicon content of 2.0% to 3.0% increased significantly, the temperature has a relatively significant effect on iron loss, and the magnetic permeability is significantly reduced. The effect of temperature is relatively insignificant.