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High-temperature superconducting (HTS) machines have the virtues of higher power density and better stability, which makes it a good prospect in the applications of wind power generation and ship propulsion. When the high-temperature superconductor is used in the rotating machines, the behavior of the conductor would be affected by the complex magnetic field, Lorentz force, and the centrifugal force. In order to evaluate the performance of the HTS coil in the machine, a finite element method model of the machine to calculate the magnetic field coupled with stress field was built in this paper. At first, the distribution of the magnetic field in the machine was calculated, then the Lorentz force was calculated and transferred to the stress field to obtain the stress and strain in the HTS and other structural materials. In the calculation, three operating conditions were considered, including no-load, full-load, and three-phase short-circuit fault. The results show that the stress on the HTS coil and the structural component are all smaller than the critical stress, which proves that the design is reliable. [ABSTRACT FROM PUBLISHER]

In order to design a High Temperature Superconducting (HTS) machine that is able to operate safely and reliably, studies on the characterization of Second Generation (2G) HTS tapes are of paramount importance. This paper presents an experimental setup to measure critical current of 2G HTS tapes in high DC magnetic fields (up to 5 Tesla) with an AC current ripple superimposed, as well as various temperatures ranging from 25 K to 77 K. The 2G tape measured is the SGS12050 coated conductor made by SuperPower. The critical current is measured by a flux vector with reference to the widest sample face from 0 to 90 degrees in 10 degree steps. Smaller steps are required close to 0^\circ. A Variable Temperature Insert (VTI) is utilized to control temperature change. [ABSTRACT FROM AUTHOR]

• Output power of 3 kW is reached for fully superconducting machine • Full design process of 3 kW fully HTS machine is described. • Comparison of analytical, finite element modeling and experimental results of 3kW HTS machine is provided. Good agreement between results is achieved. Superconducting (SC) electrical machines could affect different industries due to their high power density. The most promising of them are fully superconducting machines. In the paper whole cycle of development of fully high temperature superconducting electrical machine is described: analytical calculation of magnetic field in the active zone of the machine, finite element modeling, some design features and experimental research of small-scale prototype. It is shown that theoretical and experimental results are in good correlation. Developed approaches could be used to develop high-power machines. [ABSTRACT FROM AUTHOR]