Research On Vector Magnetic Characteristics Of Electrical Steel Sheet Based On Play Model

With the rapid development of the national economy,the capacity of electrical equipment such as motors and transformers is increasing,and arising the problem about the sharp rise of power loss.These losses are mainly distributed in the core of electromagnetic equipment such as motor,so it is very important to study the modeling of hysteresis characteristics of electrical steel sheet used in the core.The average magnetization curve is usually used to simulate the magnetic characteristics in cores in the traditional commercial finite element analysis software.As a result,because it fails to consider the hysteresis characteristics of electrical steel sheet,the resulting core loss calculation accuracy is limited.To improve the accuracy of magnetic hysteresis simulation of electrical steel sheet,the scalar Play hysteresis model and the vector Play hysteresis model were established to simulate the scalar anisotropic and vector anisotropic characteristics of electrical steel sheet.Based on one-dimensional and two-dimensional magnetic characteristics measurement system,the magnetic characteristics of electrical steel sheet in different magnetization directions were measured,and the anisotropic characteristics of electrical steel sheet were studied.The relevant parameters of the Play model were identified by the measurement data.Based on the shortcomings in the identification process,the identification method were improved,and the improved model was verified by the experimental data.Furthermore,the Play hysteresis model mentioned above was used to analyze the magnetic characteristics of the core of a permanent magnet synchronous motor,which lays a foundation for the research of high power density motor.The main research contents are as followsFirstly,based on Epstein frame measurement system,the magnetic characteristics of electrical steel sheet were measured,and the hysteresis loop obtained by magnetization in different directions was analyzed.On this basis,the scalar Play hysteresis model was established from the modeling mechanism of the Play hysteresis model,and the model parameters such as Everett function and shape function were identified.The experimental data were used to verify the model,and the research shown that the model can effectively simulate the scalar anisotropy characteristics of electrical steel sheets.Secondly,in order to further study the real magnetic characteristics of the electrical steel sheet,the periodic variation curve of the vector magnetic flux density and magnetic field strength of the electrical steel sheet under different alternating magnetization directions were measured by a two-dimensional magnetic characteristic measurement system in the lab,and the vector anisotropic magnetic characteristics of the electrical steel sheet were obtained.Then,to describe the vector anisotropy characteristic of electrical steel sheet,based on scalar Play hysteresis model,the vector Play hysteresis model was established,the shortcomings of parameter identification were analyzed,and the improved identification method was improved.Everett function and distribution function were solved again,and the simulation results of the model were compared with the experimental results to verify the effectiveness of the modeling.Finally,the vector Play hysteresis model was used to solve the magnetic characteristics of the core of a permanent magnet motor.A permanent magnet synchronous generator model was established by using the Maxwell finite element software,and the model was simulated and calculated on the premise of satisfying the precision requirement.The magnetic flux density waveforms and data of any point in the stator core in one period were extracted.