Novel shielding structure and design method therefor
A technology of shielding structure and design method, applied in the field of electromagnetics, can solve the problems of inapplicability, poor anti-interference ability and high cost
Active Publication Date: 2016-11-09
HARBIN INST OF TECH
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Problems solved by technology
The first method has the advantage of low cost, but the local anti-interference ability is poor, which is an important reason why this method cannot be applied to high magnetic field cleanliness requirements. Although the second method has a good shielding effect, it is extremely expensive and cannot be popularized to each field
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[0100] The present invention will be further described below in conjunction with the accompanying drawings.
[0101] like figure 1 A new type of shielding structure shown includes a closed coil and an outer shielding layer. The closed coils are coaxial and uniaxially arranged, and a high magnetic permeability outer shielding layer is arranged outside the coaxial arrangement group composed of closed coils, and the closed coils are connected in series. together, connect the power supply.
[0102] As an embodiment of the present invention, the closed coils are arranged in a group of four coaxial single-axis four coils, and the coaxial arrangement group composed of four closed coils is provided with a regular hexahedral high magnetic permeability outer shielding layer, The closed coils are connected in series and connected to the power supply. Let d1 be the distance between the middle coils; d2 be the distance between the two coils; a is the side length of the coil; a_shield is t...
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The invention discloses a novel shielding structure and a design method therefor, and mainly solves the problems of high cost and unsatisfactory shielding effect of the scheme in the prior art. According to the configuration of the novel shielding structure, closing coils are coaxially and mono-axially arranged; a high-magnetic-conductivity external shielding layer is arranged on the exterior of the coaxial arrangement group formed by the closing coils; the closing coils are connected in series, and are connected with a power supply; the design method comprises the steps of establishing an analysis model by the Biot-Savart law; establishing a coil magnetic field distribution model comprising the external layer magnetic conductive material boundary condition by adopting a mirror image model method; enabling the second-order equal-even order coefficient, the four-order equal-even order coefficient and the six-order equal-even order coefficient to be equal to 0 when x is equal to 0 through Taylor expansion, and solving the key structural parameters of coil spacings, the specific value of ampere turns and the like. The novel shielding structure has the advantages of low cost and good shielding effect.
Description
technical field [0001] The invention relates to the field of electromagnetism, is applicable to fields such as zero-magnetism and weak-magnetic environment simulation devices, and magnetic field protection, and specifically relates to a novel shielding structure and a design method thereof. Background technique [0002] At present, spacecraft experiments, biological experiments, and basic physical science experiments all put forward urgent demands on the cleanliness of the magnetic environment and the standard weak magnetic environment. There are generally two ways to create a clean magnetic environment: one is to offset the earth’s own uniform magnetic field and the external man-made magnetic field through a energized coil that generates a uniform magnetic field; the other is to use high magnetic permeability materials to construct a multi-layer closed passive shielding device. The geomagnetic field and man-made magnetic environment are shielded from the constructed central...
Claims
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IPC IPC(8): H05K9/00
CPCH05K9/0071
Inventor 潘东华李立毅孙芝茵李吉曹沁婕林生鑫
Owner HARBIN INST OF TECH