Abstract:

To analyze the induced electric fields generated by moving magnetic objects and address the limitations of existing models, this paper proposes a novel model that is more suitable for calculating the induced electric fields by the objects moving in any direction. The applicabilities and limitations of current models for induced electric fields from moving magnetic objects are evaluated. On the basis of evaluation, a mathematical model for the induced electric fields from moving magnetic objects is derived by using a vector potential model of magnetic dipole as the theoretical foundation. The proposed model is verified through theoretical analysis and simulating calculations. And it is further demonstrated through the case studies involving the magnetic field characteristics of actual ships. The results show that the proposed model is suitable for calculating the electric fields induced by the magnetic objects moving in any direction and is more concise in derivation and calculation compared to the traditional models based on Coulomb’s law and the Biot-Savart law. Case study results indicate that the induced electric fields generated by the motion of magnetic ships have distinct regional characteristics, with the electric field strength reaching mV/m level, which constitutes a significant component of the ship’s static electric field. The induced electric field model proposed in this study provides a more accurate theoretical basis for the detection of electric fields from moving magnetic objects and can be effectively applied to the detection and analysis of ship electric fields.

Key words: moving magnetic object, magnetic dipole, induced electric field, magnetic vector potential, ship, static electric field