Abstract:
Power losses are an important phenomenon in 2nd type superconductors. Precise evaluation of
power losses in superconducting coils is crucial for the design of novel machines such as
superconducting motors or generators. Although AC losses are relatively easy to measure
with electrical methods, it is more difficult to measure power losses in the DC mode, induced
by varying external magnetic fields, such as occur in a real operating environment. Especially
the problematic one could be the direct-drive wind generator, where several elements
introduce nonsynchronous disturbances to the magnetic fields. Modelling had been carried
out by numerous authors1-4 in order to estimate the power losses in 2G HTS coils under
various external DC or ripple fields; however experimental work in the area is less common
due to the difficulty of conducting experiments and special equipment requirements. In this
paper, power losses are experimentally measured by the calorimetric method.
