Experimental Research On The Magnetic Performance Of Non-oriented Electrical Steel Laminated Structure During The Manufacturing Process

The vigorous development of new energy vehicle industry puts higher requirements for the energy efficiency of the electrical motor.The stator core is the main structure of the electrical motor and its magnetic performance directly affects the energy efficiency of the electrical motor.During the manufacturing process of the stator core,the non-oriented electrical steel laminated structure is the main structural feature.However,the manufacturing process leads to the obviously magnetic performance deterioration of the non-oriented electrical steel lamination,which greatly affects the energy efficiency of the electrical motor.It's significant to study the influence of manufacturing process on the magnetic performance for the non-oriented electrical steel lamination.In this paper,the main manufacturing processes of non-oriented electrical steel lamination are studied through experimental methods.The influence of manufacturing process parameters on the magnetic propertiesduring the non-oriented electrical steel lamination manufacturing process is analyzed.Based on these,the manufacturing process parameters of the non-oriented electrical steel lamination are optimized.The main contents of this paper are as follows:The manufacturing process experimental platform of non-oriented electrical steel lamination are built,which mainly includes the blanking experimental platform and the laser welding experimental platform.According to the manufacturing process features of the non-oriented electrical steel lamination,the experimental methods and the manufacturing process parameters are designed.In order to study the reason of magnetic performance deterioration during the non-oriented electrical steel lamination manufacturing process,the residual stress measurement experiment,the magnetic domain observation experiment and the weld micro-structure observation experiment are designed.Aiming at the influence of blanking process on the magnetic performance of non-oriented electrical steel lamination,different shape of punches and different blanking clearances are designed.The influence of these parameters on magnetic properties of non-oriented electrical steel lamination is analyzed in detail.The residual stress distribution and the magnetic domain distribution of the non-oriented electrical steel blanked by different blanking process parameters are analyzed.Based on these research,the blanking process parameters are optimized.The resultsshow the blanking performance of flat punch is the best and the optimum blanking clearance exists among 10% to 15% of the sheet thickness.Aiming at the influence of laser welding process on the magnetic performance of non-oriented electrical steel lamination,the welding quality performance including the weld micro-structure and the magnetic performance of non-oriented electrical steel lamination under continuous laser welding and pulsed laser welding are compared at first.The influence of different pulsed laser welding process parameters such as actual welding power,duty ratio and peak power on the weld seam micro-structure and magnetic properties of non-oriented electrical steel lamination are analyzed.Based on these,the main factors which affects the welding quality of non-oriented electrical steel lamination during the pulsed laser welding process are analyzed and the pulsed laser welding process parameters are optimized.The results show the welding performance is the best when the peak power is among 110-160 W and the duty ratio is among 35-85%.