Amorphous alloys have excellent low loss characteristics and are suitable for high-performance motor cores 1. Due to the limitation of the thickness of extremely thin soft magnetic materials, stamping is not suitable for processing. At present, the most commonly used processing method is EDM 2, but this method will generate high temperature at the edge of the material, thereby changing the internal structure of the edge of the material, making iron loss worsens.
In this paper, a ring-like experiment method was used to explore the effect of EDM on the deterioration of iron loss. The first part of the paper analyzes the research situation of the scholars on the deterioration of the iron loss at the edge of the soft magnetic material core; The second part introduces the basic principles and specific methods of the ring-like experiment（The sample and principle are shown in Fig. 1）, and explores the relationship between the ratio of the area affected by cutting to the total area and the deterioration of iron loss. Taking 0.05mm ultra-thin silicon steel as a control（Some experimental results are shown in Fig. 2）, comparing the degree of iron loss deterioration of the two materials, and analyzing the iron loss deterioration law of ultra-thin soft magnetic materials; The third part analyzes the metallographic diagram of the material, observing the crystallization of amorphous alloys at the edge after EDM cutting and the behavior of 0.05mm ultra-thin silicon steel grains, and explains the reasons for the difference in the degree of deterioration of the two materials from a microscopic point of view; Finally, summarize the relevant conclusions.
To sum up, this paper compares the iron loss deterioration of amorphous alloys and other ultra-thin soft magnetic materials, and explores the iron loss deterioration law of amorphous alloys with different proportions of the area affected by cutting from the perspective of experimental data and microstructure. In the follow-up work, according to this law, the exact value of the iron loss deterioration at the cutting edge of the material is deduced to provide guidance for the application of amorphous alloys.
References:
1 Li T , Zhang Y , Liang Y , et al. Multiphysics Analysis of an Axial-Flux In-Wheel Motor With an Amorphous Alloy StatorJ. IEEE Access, 2020, 8:1-1.
2 Chai F , Li Z , Chen L , et al. Effect of Cutting and Slot Opening on Amorphous Alloy Core for High-Speed Switched Reluctance MotorJ. IEEE Transactions on Magnetics, 2020, PP(99):1-1.

Fig. 1 Test ring samples and principle

Fig. 2 Part of the experimental data