Two-dimensional model of a high-Tc superconducting dynamo

TL;DR

This paper develops a two-dimensional model for high-temperature superconducting dynamos, enabling accurate simulation of induced currents and voltages, especially when the magnet length is comparable to the strip width.

Contribution

It introduces an efficient two-dimensional numerical model for superconducting dynamos, improving upon previous one-dimensional approaches.

Findings

The model accurately predicts loop currents and electric fields.

Voltages in the stator can be computed under open circuit conditions.

One-dimensional models may be inaccurate for certain geometries.

Abstract

High temperature superconducting dynamos are capable of low loss contactless pumping large dc currents into superconducting magnet coils. We present a model of such devices and use efficient numerical methods for computing the two-dimensional loop currents and electric fields induced in the thin superconducting stator strip by a dynamo rotor mounted permanent magnet. We find also the voltages generated in the stator under the open circuit conditions. It is shown that if the length of a permanent magnet is comparable to or smaller than the strip width, the one-dimensional model employed in the previous works can be inaccurate.