为求解曲面导体在变化磁场中感应出的三维涡流，在现有的分布式电流源模型的基础上，根据六面体导体单元体特性，重新推导了导体的边界条件与电势梯度运算，提出了改进的分布式电流源模型。为了验证所提出的模型，并与有限元模型进行了对比分析。仿真结果表明：改进的分布式电流源模型与有限元模型的仿真结果高度一致，且相较于有限元模型，所提出的建模方法可以更准确地预测扫描时缺陷产生的扰动磁场，验证了所提模型在求解相关物理场问题的可靠性以及该模型在缺陷检测领域良好的应用前景。

In order to solve the 3D eddy current induced in curved conductors under varying magnetic fields, an improved distributed current source model was proposed, with the boundary conditions and potential gradient operations re-derived by considering the characteristics of the hexahedral conductor element. A comparative analysis with the finite element model was presented. The results show that the simulation outcomes of the improved distributed current source model align closely with those from the finite element model. Furthermore, the proposed model can more accurately predict the disturbance magnetic field caused by defects during scanning. It is concluded that the proposed model is reliable for solving related physical field problems and holds strong application potential in the field of defect detection.