磁屏蔽電纜感應(yīng)耦合干擾抑制機(jī)理分析
[Abstract]:The work of high speed maglev system can not be separated from the cooperation of power cable and signal cable, so it is easy to form the crosstalk between the weak line and the strong line under parallel wiring. In this paper, the crosstalk and suppression mechanism of magnetic coupling are analyzed and studied in view of the electromagnetic coupling in parallel cabling, and some experiments are designed for magnetic shielding cable with low frequency magnetic shielding, which is convenient for the design of magnetic cable. Firstly, the electromagnetic coupling of cable is theoretically analyzed according to lumped parameter model. The electric field coupling and magnetic field coupling are studied, and the suppression effect of nonmagnetic shielding layer on electric field coupling and magnetic field coupling is analyzed. It is concluded that the grounding treatment of non-magnetic shielding layer has better restraining effect on electric field coupling and high-frequency magnetic field coupling, but not on low-frequency magnetic field coupling. Secondly, the active magnetic coupling interference suppression of power cable by magnetic material as shielding layer is studied. Due to the low magnetoresistive characteristics of magnetic materials, magnetic shunt effect can be realized. Therefore, the magnetic coupling suppression effect is obtained by winding power cables with shielding layer. It is concluded that the magnetic shielding layer has no magnetic field suppression effect on single-channel power cable, but has excellent magnetic field suppression effect for the loop power cable with the same current and opposite direction. The maximum shielding efficiency of the circuit cable with current size of 70A along the x axis and z axis is 34.9dB and 26.4dB respectively. The Ansoft Maxwell magnetic field simulation software is used to simulate the above conclusions to verify the correctness of the experiments and conclusions. The passive magnetic coupling interference suppression of signal cable by magnetic material as shielding layer is studied again. The experiment circuit is also designed and the feasibility of the experimental circuit is verified by the magnetic shunt effect of the magnetic material. Then the magnetic coupling interference suppression effect of the magnetic material to the signal loop is studied by using the experimental circuit. It is concluded that the magnetic material as a shielding layer has excellent magnetic coupling interference suppression effect on the signal cable, but it is necessary to select the magnetic material with appropriate permeability and saturation magnetic induction intensity. The experimental results show that the magnetic shielding performance of the signal cable can reach 20 dB when the appropriate magnetic material is used as the shielding layer. Finally, the power cable with magnetic shielding effect and the anti-magnetic inductive coupling signal cable are designed and manufactured according to the above experimental conclusions, and a kind of diamagnetic hybrid cable is designed and manufactured innovatively. Hybrid cable can not only realize the transmission of electric power, but also realize the transmission of weak current signal.
【學(xué)位授予單位】:北京工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TM271
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