关键词: 退火, 电工钢, 定子铁芯, 磁性能

Abstract: Effect of vacuum annealing treatment on single sheet material properties and stator core magnetic properties of the electrical steel 35W360 was studied. The results show that the grain size and mechanical properties of the electrical steel change a little after annealing at 650-780 ℃. But the insulating coating is damaged by the annealing treatment, and the higher the annealing temperature, the more severe the damage. For stator cores made of the electrical steel by stamping, after annealing at higher temperatures, the iron loss and magnetic field strength decrease more at different frequencies. After cores are wound into stators, the magnetic properties of annealed stators deteriorate. As the annealing temperature increases from 650 ℃ to 780 ℃, at 50 Hz, the increase in iron loss rises from 0% to 6.67%, and the increase in magnetic field strength rises from 10.77% to 13.64%; at 300 Hz, the increase in iron loss rises from 2.08% to 6.94%, and the increase in magnetic field strength rises from 8.49% to 11.34%.

Key words: annealing, electrical steel, stator core, magnetic properties