Study Of The Sensing Structure Design And Its Calibration Method For Two Dimensional Rotation Magnetic Properties In High Frequency

Magnetic materials have important applications in the field of electrical engineering,which are mainly used in different kinds of magnetic core structure of motor,transformer and inductor.With the progress of science technology and the development of industry,energy saving,high frequency,high efficiency and miniaturization have become the themes of the development of electromagnetic equipment.As the current research trend,high frequency puts forward higher requirements for magnetic materials.Research on magnetic materials with excellent performance in high frequency will have a generally reference value for the development of electromagnetic equipment.As a representative of new materials,nanocrystalline alloy has high saturation flux density,high permeability,low loss in high frequency and some other excellent characteristics.To study it under the high frequency magnetic properties has much practical reference value and great significance for the research of new electromagnetic equipment.Based on the research of two dimensional magnetic properties of nanocrystalline alloy samples in high frequency,a new B-H sensor structure is proposed and designed,and the calibration of the H coil is achieved.Main work contents are as follows:1.This paper analyzed three kinds of measuring methods and principles of one dimensional magnetic properties and compared advantages and disadvantages of various measuring methods.And it briefly outlined the foreign and domestic existing magnetic properties of two dimensional measuring devices and the research achievements of magnetic properties of three dimensional measurements.2.Researching two common methods of production of magnetic flux density sensor:search coil and needle probe technique.After comparing the characteristics of the two methods,it showed that the search coil method was not apply for the nanocrystalline alloy samples which are thin,brittle and fragile.So it used the needle probe technique to make the magnetic flux density sensor to measure magnetic flux density of samples and used H coil sensor to measure magnetic field intensity.The two sensors were connected through the PCB board,and then a new type of B-H composite hysteresis vector sensor was presented.3.Calibrating the coil coefficient of H coil.In order to increase the uniform area of the magnetic field,a modified Helmholtz coil was designed to carry out calibration experiments of coil under high frequency.A lot of calibration experiments were carried out on the basis of theoretical analysis.The data acquisition of calibration experiment was completed by LabVIEW,and the calibration coefficient of H coil could be obtained by processing the data.4.Using the two dimensional high frequency rotating magnetic properties measuring device designed by our research group to measure the magnetic properties of nanocrystalline alloy samples under alternating magnetic field and two dimensional rotation magnetic field.By processing the induction signal collected from the B-H composite sensor,the result was obtained,and a brief analysis and summary was made.