The Optimization And Design Of Excitation And Sensing Of The Test Device Of Three-dimensional Magnetic Properties

With the development of industrial science and technology in the world,the application of magnetic materials is more and more extensive.Magnetic materials play an important role in all fields of electrical machines and appliances,so the research of magnetic materials is also more and more deeply.At present,the research on magnetic properties of one-dimensional and two-dimensional magnetic materials is relatively perfect,there are a lot of more mature theoretical methods and experimental device.But in the practical application of magnetic materials,the three dimensional magnetic properties cannot be separated.Therefore,it is very necessary to study the three-dimensional(3D)magnetic properties of the magnetic materials.The thesis is based on “Research on three-dimensional magnetic properties inspection technology of electromagnetic materials and hysteresis model of tensor” supported by NSFC.Mainly aims at the difficult problem in the field of simulation of the magnetic properties of the materials,a new method to achieve accurate three-dimensional magnetic properties of the material is put forward in this paper,a new type of three-dimensional design of improved magnetic characteristics test experimental system,its excitation and sensing systems are optimized,and the alternating and rotating magnetic properties of silicon sheet material are tested over wide frequency range.The main contents are as follows:(1)The main magnetic circuit of the excitation device of 3D magnetic properties is designed and optimized further,the excitation of the main magnetic circuit pole shape,angle and pole of sheet stacking mode is designed,and the sample to be measured is the shimming protective layer and the optimal air gap size optimization calculation the optimal magnetic field,uniform magnetic field,which lays the foundation for 3D measurement of magnetic properties of magnetic materials.(2)A flexible excitation method was exploited and an excitation system over wide frequency range is designed.This enables the SMC specimen can be technically magnetized under various excitation conditions and frequency range achieves from 2 Hz to1000 Hz.(3)A novel 3D sensing box is designed and analyzed to improve the measurement accuracy of the surface inducted H and B.Calibration technique for the novel sensing coil is proposed also.Tensor coefficient of 3D sensing box is obtained by means of comprehensive calibration experiment.In addition,the compensation approach is adopted to improve accuracy further.According to these calibration and compensation methods,Band H vectors computing formulas were derived.(4)The sensor signal detection of 3D magnetic properties is optimized,automatic test data acquisition and control system are designed,which can effectively guarantee the sensing signal without distortion,and through digital filtering and signal nulling method,effectively reduce interference in the coil,improve the accuracy of detection.(5)Based on virtual instrument to achieve 3D magnetic characteristics of the test device x,y,z three directions complex excitation pattern signal given,the waveform,frequency,amplitude,phase,sampling rate can be adjusted.The magnetic properties of the non-oriented silicon steel sheet are tested over wide frequency range,This study can provide theoretical and experimental guidance to optimize the device performance and lower the product cost.Meanwhile,it paves the way to design high frequency devices.