Reluctance motors with bulk HTS material

Oswald, B.; Best, K.-J.; Setzer, M.; Söll, M.; Gawalek, W.; Gutt, A.; Kovalev, L.K.; Krabbes, G.; Fisher, L. M.; Freyhardt, H.C.

doi:10.1088/0953-2048/18/2/006

Cited by 62 publications

(47 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These materials are extremely promising as a competing technology for permanent magnets in several engineering applications including magnetic bearings and brushless ac machines [4]- [7]. In many topologies envisaged for designing an efficient electrical motor based on bulk superconductors, the YBCO sample is permanently magnetized parallel to its -axis and placed in the machine rotor [8], [9]. In this configuration, the sample is likely to experience transient variations of the applied magnetic field caused by modifications of the applied torque on the shaft.…”

mentioning

confidence: 99%

Measurements of Thermal Effects in a Bulk YBCO Single Domain Superconductor Submitted to a Variable Magnetic Field

Laurent

Vanderbemden

Meslin

et al. 2007

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

Abstract-When YBCO single domains are subjected to a variable magnetic field, the motion of vortices may give rise to a significant temperature increase and a degradation of the superconducting properties. We have experimentally investigated such effects in bulk melt-processed YBCO single domains. Several temperature sensors, a pick-up coil and two Hall probes were placed against the surface of a monolithic bulk YBCO pellet. Data were simultaneously recorded during the application of ac magnetic fields of various amplitudes, either with or without a pre-existing dc trapped flux. The measurement results agree well with to those obtained by numerical modeling. It was also found that a superimposed dc magnetic moment reduces the temperature increase caused by the ac magnetic field.Index Terms-High-temperature superconductors, magnetic variables measurement, thermal variables measurement.

show abstract

mentioning

confidence: 99%

Measurements of Thermal Effects in a Bulk YBCO Single Domain Superconductor Submitted to a Variable Magnetic Field

Laurent

Vanderbemden

Meslin

et al. 2007

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

show abstract

“…Superconducting technology has been proposed for several machine types [21,22,23,24,25,26,27,28,29] however, most high power demonstrations of superconducting machines have been synchronous machines with superconducting field windings.…”

Section: Types Of Superconducting Machinesmentioning

confidence: 99%

Development of superconducting wind turbine generators

Jensen

Mijatović

Abrahamsen

2013

Journal of Renewable and Sustainable Energy

View full text Add to dashboard Cite

In this paper the commercial activities in the field of superconducting machines, particularly superconducting wind turbine generators, are reviewed and presented. Superconducting generators have the potential to provide a compact and light weight drive train at high torques and slow rotational speeds, because high magnetic fields can be produced by coils with very little loss.Three different superconducting wind turbine generator topologies have been proposed by three different companies. One is based on low temperature superconductors (LTS); one is based on high temperature superconductors (HTS); and one is a fully superconducting generator based on MgB 2 . It is concluded that there is large commercial interest in superconducting machines, with an increasing patenting activity.Such generators are however not without their challenges. The superconductors have to be cooled down to somewhere between 4K and 50K, depending on what type of superconductor is employed, which poses a significant challenge both from a construction and operation point of view. The high temperature superconductors can facilitate a higher operation temperature and simplified cooling, but the current price and production volumes prohibit a large scale impact on the wind sector. The low temperature superconductors are readily available, but will need more sophisticated cooling.Eventually the CoE from superconducting wind turbines, with particular emphasis on reliability, will determine if they become feasible or not and for such investigations large-scale demonstrations will be needed.

show abstract

“…Several demonstration projects were carried out where the latest one was a 400 kW motor with N dF eB magnets and bulk HTS (YBCO) in four pole rotor topology which was successfully constructed and tested (98) where the rotor was cooled via liquid nitrogen at 77 K (99).…”

Section: Hts Machinesmentioning

confidence: 99%

Superconducting wind turbine generators

Abrahamsen¹,

Mijatović

Seiler³

et al. 2010

Supercond. Sci. Technol.

196

View full text Add to dashboard Cite

We have examined the potential of 10 MW superconducting direct drive generators to enter the European offshore wind power market and estimated that the production of about 1200 superconducting turbines until 2030 would correspond to 10% of the EU offshore market. The expected properties of future offshore turbines of 8 and 10 MW have been determined from an up-scaling of an existing 5 MW turbine and the necessary properties of the superconducting drive train are discussed. We have found that the absence of the gear box is the main benefit and the reduced weight and size is secondary. However, the main challenge of the superconducting direct drive technology is to prove that the reliability is superior to the alternative drive trains based on gearboxes or permanent magnets. A strategy of successive testing of superconducting direct drive trains in real wind turbines of 10 kW, 100 kW, 1 MW and 10 MW is suggested to secure the accumulation of reliability experience. Finally, the quantities of high temperature superconducting tape needed for a 10 kW and an extreme high field 10 MW generator are found to be 7.5 km and 1500 km, respectively. A more realistic estimate is 200–300 km of tape per 10 MW generator and it is concluded that the present production capacity of coated conductors must be increased by a factor of 36 by 2020, resulting in a ten times lower price of the tape in order to reach a realistic price level for the superconducting drive train.

show abstract

Reluctance motors with bulk HTS material

Cited by 62 publications

References 3 publications

Measurements of Thermal Effects in a Bulk YBCO Single Domain Superconductor Submitted to a Variable Magnetic Field

Measurements of Thermal Effects in a Bulk YBCO Single Domain Superconductor Submitted to a Variable Magnetic Field

Development of superconducting wind turbine generators

Superconducting wind turbine generators

Contact Info

Product

Resources

About