Applications and modelling of bulk HTSs in brushless ac machines

Barnes, George; McCulloch, Malcolm; Dew‐Hughes, D.

doi:10.1088/0953-2048/13/6/352

Cited by 16 publications

(8 citation statements)

References 10 publications

(10 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to acting as TFMs with high magnetic fields, hollow, cylindrical or tube-shaped bulk superconductors are also able to shield magnetic fields in a more efficient way than an equivalent ferromagnetic cylinder [206][207][208]. This shielding property has also been exploited in bulk superconductor reluctance machines [209,210], where the magnetic field along the direct axis is enhanced by reinforcing the low reluctance path provided by the ferromagnetic material in the rotor.…”

Section: Hollow Bulk Cylinders and Tubes For Shieldingmentioning

confidence: 99%

Modelling of bulk superconductor magnetization

Ainslie

Fujishiro

2015

Supercond. Sci. Technol.

182

166

View full text Add to dashboard Cite

This paper presents a topical review of the current state of the art in modelling the magnetization of bulk superconductors, including both (RE)BCO (where RE = rare earth or Y) and MgB 2 materials. Such modelling is a powerful tool to understand the physical mechanisms of their magnetization, to assist in interpretation of experimental results, and to predict the performance of practical bulk superconductor-based devices, which is particularly important as many superconducting applications head towards the commercialisation stage of their development in the coming years. In addition to the analytical and numerical techniques currently used by researchers for modelling such materials, the commonly used practical techniques to magnetize bulk superconductors are summarised with a particular focus on pulsed field magnetization (PFM), which is promising as a compact, mobile and relatively inexpensive magnetizing technique. A number of numerical models developed to analyse the issues related to PFM and optimise the technique are described in detail, including understanding the dynamics of the magnetic flux penetration and the influence of material inhomogeneities, thermal properties, pulse duration, magnitude and shape, and the shape of the magnetization coil(s). The effect of externally applied magnetic fields in different configurations on the attenuation of the trapped field is also discussed. A number of novel and hybrid bulk superconductor structures are described, including improved thermal conductivity structures and ferromagnet-superconductor structures, which have been designed to overcome some of the issues related to bulk superconductors and their magnetization and enhance the intrinsic properties of bulk superconductors acting as trapped field magnets (TFMs). Finally, the use of hollow bulk cylinders/tubes for shielding is analysed.

show abstract

Section: Hollow Bulk Cylinders and Tubes For Shieldingmentioning

confidence: 99%

Modelling of bulk superconductor magnetization

Ainslie

Fujishiro

2015

Supercond. Sci. Technol.

182

166

View full text Add to dashboard Cite

show abstract

“…Currently there are essentially three categories of machines optimized with superconductor materials: hysteresis, reluctance and trapped field motors [21], [22], [23]. Theoretically, the torque produced from an HTS machine is three to five times higher than the torque obtained for the same conventional machine, made by conventional materials [24].…”

Section: Electric Disc Motorsmentioning

confidence: 99%

Disc Motor: Conventional and Superconductor Simulated Results Analysis

Inácio¹,

Martins²,

Neves³

et al. 2010

IFIP Advances in Information and Communication Technology

View full text Add to dashboard Cite

Abstract. Taking into consideration the development and integration of electrical machines with lower dimensions and higher performance, this paper presents the design and development of a three-phase axial flux disc motor, with 50 Hz frequency supply. It is made with two conventional semi-stators and a rotor, which can be implemented with a conventional aluminum disc or a high temperature-superconducting disc. The analysis of the motor characteristics is done with a 2D commercial finite elements package, being the modeling performed as a linear motor. The obtained results allow concluding that the superconductor motor provides a higher force than the conventional one. The conventional disc motor presents an asynchronous behavior, like a conventional induction motor, while the superconductor motor presents both synchronous and asynchronous behaviors.

show abstract

“…Among them, Superconducting Synchronous Reluctance Motors (ScSynRM) are studied and tested in different companies and research institutes [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

2D analytical modeling of a wholly superconducting synchronous reluctance motor

Male¹,

Lubin²,

Mezani³

et al. 2011

Supercond. Sci. Technol.

View full text Add to dashboard Cite

An analytical computation of the magnetic field distribution in a wholly superconducting synchronous reluctance motor is proposed. The stator of the studied motor consists of three-phase HTS armature windings fed by AC currents. The rotor is made with HTS bulks which present the specificity to have a diamagnetic behavior under zerofield cooling. The electromagnetic torque is obtained by the interaction between the rotating magnetic field created by the HTS windings and the HTS Bulks. The proposed analytical model is based on the resolution of Laplace's and Poisson's equations (by the separation of variables technique) for each sub-domain, i.e. stator windings, air-gap, holes between HTS bulks and exterior iron shield. For the study, the HTS bulks are considered as perfect diamagnetic materials. The boundary and continuity conditions between each sub-domains yield to the global solution. Magnetic field distributions and electromagnetic torque obtained by the analytical method are compared with those obtained from finite element analyses.

show abstract

Applications and modelling of bulk HTSs in brushless ac machines

Cited by 16 publications

References 10 publications

Modelling of bulk superconductor magnetization

Modelling of bulk superconductor magnetization

Disc Motor: Conventional and Superconductor Simulated Results Analysis

2D analytical modeling of a wholly superconducting synchronous reluctance motor

Contact Info

Product

Resources

About