Flux pumping

Flux pumping

High Temperature Superconducting Motors

Published in Ranjan Vepa, Electric Aircraft Dynamics, 2020

One approach to keeping the field coils magnetized is to use flux-trapped superconductors to maintain the flux in the field coils. Such a superconductor is also known as a flux pump, a concept which has been discussed in the preceding section. A flux pump enables a DC current to be driven within a closed superconducting circuit without the need for a direct electrical connection to a power supply. This eliminates the thermal losses associated with metal leads conducting current. Such machines are modeled as high-field and low-resistance machines, but the torque constant is relatively high. They need minimal energy for super-cooling over an entire flight, and continuous magnetization is provided by periodic flux pumping.

The effect of time-dependent γ-pumping on buoyant magnetic structures

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Journal Information

Published in Geophysical & Astrophysical Fluid Dynamics, 2018

Abrar A. Ali, Lara J. Silvers

To analyse the behaviour of emerging magnetic flux in greater detail, we examine the horizontal magnetic component of the field in the y-direction as a function of time and depth. Figure 3 focuses on an individual magnetic flux tube (see the box in figure 2(f) for a visualisation of the region of interest) at the particular point x=0.25 and y=0, and study the changes that are occurring to the magnetic field in relation to the strength of the γ-pumping. In order to enable a clearer interpretation of the results, the difference is also plotted; positive values of represent changes in the magnetic field and/or the magnetic flux pumping such that the γ-pumping is able to hold back the upward transport of the magnetic field.

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High Temperature Superconducting Motors

The effect of time-dependent γ-pumping on buoyant magnetic structures