Design And Simulation Of Nanocrystalline Alloy Excitation Structure In Two Dimensional Magnetic Measurement

With the progress of technology and the development of industry, kinds of electromagnetic equipments such as motors, transformers, inductors, are widely used in power system, communications, transportation, national defense and other fields. Energy saving, high efficiency and miniaturization are becoming the trends of electromagnetic devices. As the core structure affects the volume and energy consumption of electromagnetic equipment directly, accurate measurement and analysis on the magnetic properties of magnetic core materials is of great importance. At present, the main measurement methods of the magnetic properties are one-dimensional magnetic properties measurement and two-dimensional magnetic properties measurement. While 1D magnetic properties measurement can’t be used to measure the rotational magnetic property, 2D magnetic properties measurement breaks the limitation and is becoming a hot spot of current research. Nanocrystalline alloy material with high saturation magnetic flux density, high magnetic permeability, and low loss at high frequency, is one of the very important magnetic materials used in high frequency condition. This paper is about simulation and analysis on 2D excitation structure using nanocrystalline alloy as core material. And on the basis of the existing devices, a new type of two-dimensional excitation structure is proposed.First of all, this paper introduces the measuring principle and device structure of 1D magnetic properties measurement. Also the advantages and disadvantages of different methods are compared. Moreover, the formation principle of rotating magnetic field and the existing 2D magnetic properties testers at home and abroad are introduced. Comparisons of the testers’ structure and performance are also made.Secondly, this paper introduces the numerical calculation method called “finite element method” and electromagnetic field finite element analysis software ANSYS Maxwell. 2D models of three kinds of typical excitation structures are established. Uniformity and magnitude of the magnetic flux density in the samples were analyzed on different magnetization angles. Also, the mean value and standard deviation of magnetic flux density and B vector trajectory with no feedback control are compared.Finally, according to the physical properties of nanocrystalline alloy material and simulation comparison results, a new 2D excitation structure using nanocrystalline alloy core material is proposed. The magnetic resistance network is used for the magnetic circuit design, and the new type of excitation structure is simulated by Maxwell 3D. Further analysis is done on the magnetization and uniformity degree of sample. The B-coil and H-coil sizes are preliminarily determined. By adding the magnetic shielding layer, the device performance is optimized and the homogeneous degree of the magnetic flux density in the samples is improved.