Modeling Of Hysteresis Characteristics And Loss Analysis Of Electrical Soft Magnetic Materials

Soft magnetic materials play an important role in the field of electrical applications.The hysteresis characteristics of soft magnetic materials are closely related to the operating characteristics of electrical equipment such as transformers and motors.It is of great significance to fully describe the hysteresis characteristics of soft magnetic materials for the fine design of electrical equipment.In this thesis,aiming at the problems of local overheating,high energy consumption and high consumables caused by the low utilization rate of magnetic material performance in traditional electrical equipment,hysteresis modeling method is adopted to incorporate temperature and rotating hysteresis into the model,so that the simulation is closer to the actual magnetization process,so as to improve the reliability of material magnetic characteristic data,expand the utilization boundary of material characteristics,and improve the electrical performance of electrical equipment.The validity of the model is verified by comparing the measured and calculated values of the core loss of the sample.Finally,the model is applied to a three-phase 36-slot 6-pole surface-mounted permanent magnet motor to calculate its total loss and rotating core loss,and verify the engineering applicability of the model.The main contents are as follows:1.Based on Weiss molecular field theory and spontaneous magnetization mechanism,a temperature modified J-A dynamic hysteresis model is proposed to describe the effect of temperature on saturation magnetization M_s during magnetization.The simulated annealing particle swarm optimization algorithm is used to identify the model parameters,and the finite element method is used to calculate the local core loss and its distribution,which provides the basis for the study of local overheating problem.Finally,the calculated and measured core loss values of 50WW600 non-oriented silicon steel sheet and 30Q130 oriented silicon steel sheet are compared and analyzed to verify the validity of the model,which lays a model foundation for subsequent research.2.Based on the magnetic domain theory of materials and the characteristics of magnetic domain motion during magnetization,a hybrid scalar model with full physical mechanism is proposed to fully describe the magnetic domain rotation and domain wall bending and displacement.The calculated and measured values of core loss of non-oriented silicon steel50WW470,oriented silicon steel BTM406 and amorphous strip 1k101 were compared and analyzed to verify the feasibility of the model.Taking distortion excitation and DC bias as test conditions,it is verified that the model is also applicable under non-sinusoidal excitation.3.Based on the magnetization process of the coexistence of rotating magnetization and alternating magnetization and the characteristics of the mixed scalar model,combined with the S-W model modeling theory,a two-dimensional vector hybrid model is proposed to study the rotating magnetization.With the help of two-dimensional rotating magnetization measurement platform,the rotating magnetization characteristics of sample electrical steel 50WW400 were tested,and the alternating loss and rotating loss were compared and analyzed.The model is applied to the rotating motor to calculate the rotation loss and total loss of the motor and verify the accuracy of the model.