Overview of High Temperature Superconductor Machines

2021 ◽  
Vol 4 (4) ◽  
pp. 25-33
Author(s):  
Bruno Douine ◽  
◽  
Hocine Menana ◽  
Kevin Berger ◽  
Jean Lеvеque ◽  
...  
Keyword(s):  
High Temperature ◽  
Power Systems ◽  
High Temperature Superconductor ◽  
High Temperature Superconductors ◽  
Synchronous Machine ◽  
Recent Time ◽  
Operating Principle ◽  
Electrical Machines ◽  
Synchronous Machines ◽  
Ac Losses

Electrical machines are important parts of different power systems. The application of high temperature superconductors (HTS) in electrical machines is very promising due to high transport currents. This paper reviews various topologies of superconducting motors and generators using HTS published in the literature in recent time. It begins with a brief presentation of the HTS material used in electrical machines. The description of AC losses and cryogenic systems is done afterwards. Then we offer a striking description of the various realizations of HTS electrical machines such as half HTS synchronous machines, fully HTS synchronous machine, machines with HTS bulks and stacks. Some of these machines are totally innovative compared to conventional ones and their operating principle is strictly related to the presence of HTS materials.

scholarly journals Measurements and Analysis of AC Losses in HTS Windings of Electrical Machine for Different Operation Modes

2021 ◽  
Vol 11 (6) ◽  
pp. 2741
Author(s):  
Sergey Zanegin ◽  
Nikolay Ivanov ◽  
Vasily Zubko ◽  
Konstantin Kovalev ◽  
Ivan Shishov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
High Temperature Superconductor ◽  
High Temperature Superconductors ◽  
Transport Current ◽  
Operating Conditions ◽  
Ac Losses ◽  
Electrical Machine ◽  
2Nd Generation ◽  
Motor Mode

The article is devoted to the study of losses in devices based on high-temperature superconductors of the 2nd generation. The complexity of the devices under study increases from a single rack coil to a winding assembled from several coils, and finally to an electric machine operating in generator mode. This is the way to experimentally study the behavior of 2nd generation high temperature superconductor (2G HTS) carrying a transport current in various conditions: self-field, external DC, and AC magnetic field. Attention is also paid to the losses in the winding during its operation from the inverter, which simulates the operating conditions in the motor mode of a propulsion system.

scholarly journals Design and Characteristic Analysis of a Homopolar Synchronous Machine Using a NI HTS Field Coil

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5658
Author(s):  
Young Jin Hwang
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Synchronous Machine ◽  
Electrical Machines ◽  
Advanced Materials ◽  
Characteristic Analysis ◽  
Field Coil ◽  
Research Fields ◽  
Operating Stability ◽  
Conducting Research

This paper deals with a homopolar synchronous machine (HSM) applying high-temperature superconducting (HTS) field coils. Superconductors, especially high-temperature superconductors, have high potential as advanced materials for next-generation electrical machines due to their high critical current density and excellent mechanical strength. However, coils made with high-temperature superconductors have a high risk of being damaged in the event of a quench due to the intrinsic low normal zone propagation velocity (NZPV). Therefore, the coil protection issue has been regarded as one of the most important research fields in HTS coil applications. Currently, the most actively studied method for quench protection of the HTS coils is the no-insulation (NI) winding technique. The NI winding technique is a method of winding an HTS coil without inserting an insulating material between turns. This method can automatically bypass the current to the adjacent turn when a local quench occurs inside the HTS coil, greatly improving the operating stability of the HTS coils. Accordingly, many institutions are conducting research to develop advanced electrical machines using NI HTS coils. However, the NI HTS coil has its intrinsic charge/discharge delay problem, which makes it difficult to successfully develop electrical machines using the NI HTS coil. In this study, we investigated how this charging/discharging problem appeared when the NI HTS coil was used in an HTS homopolar synchronous machine (HSM) which is one of the electrical machines with a high possibility of applying the HTS coil in the future because it has a stationary field coil structure. For this, the characteristic resistances of HTS coils were experimentally obtained and applied to the simulation model.

scholarly journals Microstructure of High Temperature Superconductors of the Perovskite Type

1987 ◽  
Vol 40 (4) ◽  
pp. 547 ◽  
Author(s):  
AF Moodie ◽  
HJ Whitfield
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
High Temperature Superconductor ◽  
High Temperature Superconductors ◽  
High Resolution Electron Microscopy ◽  
Convergent Beam Electron Diffraction ◽  
Beam Electron ◽  
Resolution Electron ◽  
Convergent Beam ◽  
Perovskite Type

Combined high resolution electron microscopy and convergent beam electron diffraction (CBED) of the same areas of crystals of Ba3La3Cu6014 reveals defects of various types including ordinary dislocations and polytypic intergrowths. This latter type is considered to be intimately associated with the performance of this material as a high temperature superconductor ..

Computation of AC losses in high-temperature superconductors

1998 ◽  
Vol 310 (1-4) ◽  
pp. 62-66 ◽  
Author(s):  
Jaakko Paasi ◽  
Jorma Lehtonen ◽  
Markku Lahtinen ◽  
Lauri Kettunen
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Ac Losses

AC losses of YBa2Cu3O7−x high temperature superconductors

1991 ◽  
Vol 180 (5-6) ◽  
pp. 373-380 ◽  
Author(s):  
S. Zannella ◽  
L. Jansak ◽  
D. Lee ◽  
K. Salama
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Ac Losses

Electron irradiation effects in doped high temperature superconductors YBa2Cu3−x MxOy (M = Fe, Ni; x=0; x=0:01)

Open Physics ◽  
2008 ◽  
Vol 6 (4) ◽  
Author(s):  
Aram Sahakyan ◽  
Sergei Nikoghosyan ◽  
Hrant Yeritsyan
Keyword(s):  
High Temperature ◽  
Critical Current ◽  
Irradiation Dose ◽  
High Temperature Superconductor ◽  
Defect Formation ◽  
Weak Link ◽  
High Temperature Superconductors ◽  
Large Change ◽  
Impurity Doped ◽  
Intergranular Critical Current Density

AbstractThe influence of irradiation by electrons with an energy of 8 MeV, at dose intervals between 1013 and 2×1018el/cm2, on the properties of impurity doped, high-temperature superconductor YBa2Cu3−x MxOy (M = Fe, Ni; x=0; x=0:01) ceramics has been studied.It has been established that, as the irradiation dose is increased, the onset temperature of the transition to the superconducting state (T con), and the intergranular weak link coupling temperature between granules (T mJ), exhibit an oscillation around their initial values of approximately about 1–1.5 K. This oscillation indicates that the process of radiation defect formation in HTSC occurs in multiple stages. It was also found that the critical current (J c)decreases with an increase of the irradiation dose, and exhibits a local minimum at a dose of 8×1016el/cm2coinciding with minima for T con and T mJ at this dose. It was found that the introduction of Fe atoms to the ceramic decreases T mJ, while introducing Ni atoms decreases both T con and T mJ; it is suggested that this is a result of Ni substitution of Cu both in Cu2 plane sites and Cu1 chain sites. The introduction of Ni causes a large change in the intergranular critical current density, J c. A critical irradiation dose is obtained (2×1018)after which all HTSC parameters strongly decrease, i. e. the superconductivity of HTSC is destroyed.

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