Calculation Method for the Inductance of the Ship Deperming Coils Considering the Hull Eddy Current Effect

doi:10.12382/bgxb.2021.0596

Abstract

Abstract: Deperming power systems are designed based on the inductance of the ship deperming coils. In view of the complex ship structure and the significant demagnetization effect of the hull eddy current, an approach for calculating the inductance based harmonic magnetic analysis is presented. A 3-D harmonic magnetic analysis is conducted to extract the real and imaginary parts of the coil terminal voltages and currents, based on which the coil inductances can be determined according to the impedance phasor expression. The influence of the skin effect of the shell eddy current on the calculation is emphatically analyzed and the shell mesh further optimized. The inductance of the deperming coils on the actual scale aircraft carrier are calculated, and its influencing factors discussed. The analytic calculation model of the air-core coil inductance and the physical scale model of the aircraft carrier deperming coil inductance are designed, and the scaled model inductance is measured. The results show that the relative error of the air-core coil inductance calculation is merely 1.8%, and the maximum relative errors of the self-inductance and mutual inductance calculations of the scaled-down model are 7.1% and 17.2%, respectively. This convincingly validates the effectiveness of the proposed method and provides a reference for the design of power source for ship deperming.

Key words: ship, depermingcoils, inductancecalculation, eddycurrent, skineffect

CLC Number:

U665.18

ZHOU Guohua, TANG Liezheng, SUN Zhaolong, WU Kena, LI Zhixin. Calculation Method for the Inductance of the Ship Deperming Coils Considering the Hull Eddy Current Effect[J]. Acta Armamentarii, 2022, 43(11): 2866-2874.

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