Optimization of the force modeling between high temperature superconductor and permanent magnet

The determination of the optimum force between a permanent magnet and a high temperature superconductor is studied in terms of frozen image model. The Amperian surface current assumption is assumed for the magnetization of the permanent magnet in the force calculation. The modeling is incorporated with the magnetic configurations of the magnet-superconductor system, such as vertical force for different cooling procedures. In the optimization study, the Amperian bulk current assumption is introduced to the force calculation. Comparing the theoretical results obtained from both assumptions with the experimental results showed that the force estimation is better with the bulk current assumption than that of the surface current. The results indicate that this improvement in the calculation of the force between the superconductor and permanent magnet is useful for larger geometries such as superconducting energy storage systems.