Analysis and Experiment of Flux Distribution around Magnetic Structure in Earth's Magnetic Field(<Special Issue>Asia-Pacific Symposium on Applied Electromagnetics and Mechanics(APSAEM10))
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In the earth's magnetic field, a magnetic structure gets a magnetization and creates a local magnetic perturbation. In order to make the magnetic structure magnetically "silent", degaussing coils are prepared in it, and currents in those coils are controlled. For the optimal design of the coils and optimal control of the currents, the precise distribution of flux under the earth's magnetic field should be analyzed. But, the reports of such detailed analysis and measurement are few. In this paper, the disturbance of magnetic field due to a magnetic structure is analyzed, and the experimental investigation is carried out. A suitable B-H property for such an analysis under the earth's magnetic field is also examined. It is pointed out that a BH curve, which is changed by the residual magnetization in the magnetic material due to the earth's magnetic field, should be used in order to analyze the behavior of magnetic material under the earth's magnetic field. It is shown that the flux density in the magnetic material in the earth's magnetic field is larger about one hundred times larger than the earth's magnetic flux density, and the disturbance due to a magnetic structure can be reduced by degaussing coils.
- 日本AEM学会誌 = Journal of the Japan Society of Applied Electromagnetics
日本AEM学会誌 = Journal of the Japan Society of Applied Electromagnetics 19(Supplement), S135-S138, 2011-09-10