Abstract
High temperature superconducting (HTS) tape can be cut and stacked to form composite bulks capable of generating fields as high as 17.7 T, the highest of any trapped field magnet. This makes them the most powerful permanent magnets accounting for the need to maintain a cryogenic temperature. This cryogenic penalty is increasingly being justified due to the significantly higher power densities (>10kW/Kg) fully superconducting motors can enable by using magnetized stacks of tape on the rotor and HTS coils on the stator. Design considerations for a motor using magnetized stacks for aerospace applications will be presented including FEM modelling in COMSOL and experimental prototype results for candidate designs. The rotor AC loss due to heating by ripple fields will be discussed based on these results and its interdependence with stator AC loss in a fully superconducting motor which has not always been appreciated in previous partially superconducting motor designs.
Highlights
High temperature superconducting (HTS) tape can be cut and stacked to form composite bulks capable of generating fields as high as 17.7 T, the highest of any trapped field magnet. This makes them the most powerful permanent magnets accounting for the need to maintain a cryogenic temperature
This cryogenic penalty is increasingly being justified due to the significantly higher power densities (>10kW/Kg) fully superconducting motors can enable by using magnetized stacks of tape on the rotor and HTS coils on the stator
The application of high temperature superconductors (HTS) to commercial devices has been troublesome despite the advantages offered by this kind of materials discovered decades ago
Summary
The application of high temperature superconductors (HTS) to commercial devices has been troublesome despite the advantages offered by this kind of materials discovered decades ago. Nowadays the increasing requirements of capital intensive industries, nuclear [1] and aerospace [2], might be opening further application fields These developments from the demand point of view should be corresponded by advances in the manufacturability and usability of superconductive arrangements. In this sense, stacks of superconductive tape, consisting of layers of tape soldered together taking advantage of the metallic substrate on the superconducting layer is deposited, offer a stimulating opportunity for its application on electromagnetic devices as substitutes of permanent magnets.
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