Braided shielding layer radius design method based on shielding effectiveness

Abstract

The invention discloses a braided shielding layer radius design method based on shielding effectiveness, and relates to the technical field of braided cables, provides an efficient way for electromagnetic radiation of electromechanical equipment for the cable, is one of main sources of electromagnetic compatibility of the equipment, and does not disclose an effective technology for solving the electromagnetic compatibility problem of the cable from a shielding structure design at present, and the key points of the technical scheme are as follows: establishing a kley transfer impedance model; establishing a function relation between the core wire current and the shielding layer current according to the kley transfer impedance model; establishing an electromagnetic radiation model of the shielding layer current by adopting a dipole approximation method; defining the shielding effectiveness of the cable. According to the method, the mathematical relationship between the cable shielding effectiveness and the braided shielding layer is determined, the quantitative relationship between the cable shielding effectiveness and the radius of the shielding layer is obtained through analysis, atheoretical basis is provided for evaluation of the electromagnetic compatibility of the cable and design of a shielding structure, and the compatibility problem of signal transmission in a complex electromechanical equipment system is solved.

Description

technical field [0001] The invention relates to the technical field of braided cables, in particular to a method for designing the radius of a braided shielding layer based on shielding effectiveness. Background technique [0002] Braided cables are widely used in electromechanical equipment because of their good shielding effect and flexibility. Such as figure 1 As shown, the braided shielding layer is made of multiple bundles of metal conductive filaments alternately braided. Due to the existence of braided meshes, the external electromagnetic field can pass through these braided meshes to generate electromagnetic interference on the core wire; similarly, the electromagnetic field generated by the core wire is also Electromagnetic radiation can be generated outwards through these meshes. Therefore, cables provide an efficient way for electromagnetic radiation of electromechanical equipment, and are one of the main sources of equipment electromagnetic compatibility proble...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for designing the radius of the braided shielding layer based on the shielding effectiveness, which can provide a theoretical basis for the evaluation of the cable electromagnetic compatibility performance and the design of the shielding structure, and solve the compatibility problem of signal transmission in complex electromechanical equipment systems.

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