Simulation And Design Of Magnetic Field Structure Of Magnetoelectric Seismometer

Magnetoelectric seismometer is simple in structure,reliable in performance and convenient for covering and networking.it was first used in the field of earthquake monitoring.The magnetic field structure is used as a transducing place in magnetoelectric seismometer.the performance of the magnetic field structure will directly affect the recording of seismic wave and the subsequent processing of seismic wave data.The research of related scholars shows that in order to obtain a high-precision seismometer with high sensitivity and low distortion,the structure of the seismometer should have a high magnetic induction intensity and a uniform air gap magnetic field.In this paper,the magnetic field structure of magnetoelectric seismometer is studied,and the magnetic induction intensity and magnetic field uniformity in air gap are analyzed.Firstly,that system model of magnetoelectric seismometer is analyze.when the air gap magnetic field is analyzed in detail.The magnetic field structure of DS – 4A short-period seismometer is analyzed and simulated by ANSYS Maxwell software.The result is a magnetic induction line distribution and a magnetic induction intensity cloud diagram in the air gap.Specifically,the uniform magnetic field on the trajectory of the coil was studied.The size of the magnetic shoe was optimized under the condition that the overall size of the seismometer was not changed.The simulation results show that the homogeneity of the optimized air gap magnetic field is significantly improved.At the same time,this subject re-presents a dual magnetic steel differential magnetic field structure consisting of two cylindrical permanent magnets,anH-shaped magnetic shoe and an external magnetic yoke.The results show that the new magnetic field structure effectively broadens the range of uniform magnetic field and increases the intensity of air gap magnetic field.The transient simulation results show that the harmonic content in the induced voltage components is greatly reduced.The actual measurement results show that compared with the traditional magnetic field structure,the magnetic field uniformity range of the new magnetic field structure in the whole air gap path is improved by 23 %,and the magnetic induction intensity is improved by 24 %.The redesigned magnetic field structure will improve the sensitivity and distortion of the whole seismometer.