Magnetostrictive Characteristics And Vibration And Noise Analysis Of High Frequency Transformers

Amorphous alloy material has the characteristics of low loss.Amorphous alloy transformer play a very important role in the transmission and distribution system,but the vibration and noise generated during its operation will affect the surrounding environment,and the long-term use of the equipment will also affect its performance.The magnetostrictive effect of amorphous alloy transformer core is the main source of core vibration.In order to analyze the vibration,it is necessary to accurately measure the magnetization and magnetostrictive characteristics of amorphous alloy transformer core.At present,many countries in the world are deeply studying the content of amorphous transformers.However,magnetostriction and noise analysis under high frequency conditions have not been published.Therefore,it is necessary to further study the noise characteristics of amorphous alloy transformers.In order to study the vibration and noise of transformer core under the condition of high frequency,the magnetic characteristics and magnetostrictive characteristics of amorphous alloy are measured in this paper.The magnetostrictive effect of the core is mainly considered.The vibration and noise of transformer are analyzed and studied from the perspective of establishing the magnetostrictive model.The finite element model of amorphous alloy transformer was established based on the magnetic characteristics and magnetostrictive characteristics data,and the model was compared with the measured results of vibration experiment to verify the effectiveness of the model.The main research contents of this paper are as follows:(1)The magnetic characteristics of amorphous alloy materials were measured,and the corresponding magnetization and magnetostrictive characteristics data were obtained.Based on the experimental measurement data,the parameters of the magnetostrictive model were determined and the accuracy was verified in the later stage.(2)In consideration of the fact that k changes with the magnetization state in the actual magnetization process,the traditional J-A model is improved by introducing the parameter v,considering the frequency change and adding eddy current loss and residual loss.The modified magnetization intensity M is combined with the quadratic domain transition model,and a suitable magnetostrictive model is established for the simulation of amorphous alloy.Among them,the parameter identification mainly relies on the particle swarm optimization algorithm.The parameter changes under different excitation were analyzed,and the parameters were taken into the model to calculate the hysteresis loop and magnetostrictive loop.The calculation was carried out,and the results were compared to prove their accuracy.(3)Based on the model data,based on the magnetic characteristic curve and the magnetostrictive single value curve,and considering the magnetostrictive effect of the core,the physical field of the core of the amorphous alloy transformer is analyzed and calculated in turn to verify the rationality and accuracy of the numerical calculation.(4)Through the magnetostrictive model,the corresponding high frequency magnetic characteristic data and the single value curve data of magnetostrictive were obtained,which were taken into the established finite element model for vibration and noise analysis,and compared with the vibration and noise measurement data under high frequency conditions to verify the practicability of the magnetostrictive model under high frequency excitation.