High-Uniformity Calculation Method of Four-Coil Configuration in Large-Caliber Magnetic Field Immunity Testing System

TL;DR

This paper presents a novel calculation and optimization method for four-coil configurations to generate highly uniform magnetic fields in large-caliber magnetic immunity testing systems, validated by experiments.

Contribution

It introduces a new global parameter optimization approach based on Lagrange multipliers for coil design to achieve high magnetic field uniformity.

Findings

Derived magnetic field calculation formulas for four-coil configurations.

Proposed an optimization method using KKT conditions for coil parameters.

Experimental results confirm the effectiveness of the proposed design scheme.

Abstract

Power electronic equipment regulated by the International Thermonuclear Experimental Reactor (ITER) organization must pass the relevant steady-state magnetic field immunity test. The main body of magnetic field immunity test is magnetic field generator coil. Through mathematical derivation in this paper, the magnetic field calculation formulas of four-coil configuration under ideal and actual models are obtained. The traditional method of magnetic field performance calculation is compared with the general formula method under the ideal model. A global parameter optimization method based on Lagrange Multiplier by KKT conditions is proposed to obtain the coil parameters of high-uniformity magnetic field. The magnetic field distribution in the uniform zone is revealed by the finite element method. The model analysis is proved to be correct and effective by experimental results. The research of this paper provides a practical scheme for the coil design with high magnetic field and high-quality uniformity.