Development of a synchronous motor with Gd–Ba–Cu–O bulk superconductors as pole-field magnets for propulsion system

Miki, M.; Tokura, Susumu; Hayakawa, H; Inami, H; Kitano, Masahiko; Matsuzaki, H.; Kimura, Yosuke; Ohtani, I; Morita, E; Ogata, Hisao; Izumi, Mitsuru; Sugimoto, H.; Ida, Tetsuya

doi:10.1088/0953-2048/19/7/s14

Cited by 86 publications

(51 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this regards, superconducting bulks have been used extensively in practice as a replacement for rare-earth permanent magnet [3]. However, regardless of practical cHallenges due to mechanical instability in high field imposed by Lorentz forces and low current density comparable the size of a bulk [4], [5], the crossed magnetic field has a destructive effect on the magnetization of superconducting bulks [6].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Demagnetization in HTS Stacked Tapes Implemented in Electric Machines as a Result of Crossed Magnetic Field

Baghdadi

Fagnard

Zhang

et al. 2015

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

This paper investigates the practical effectiveness of employing superconducting stacked tapes to superconducting electric machinery. The use of superconducting bulks in various practical applications has been addressed extensively in the literature. However, in practice, dramatic demagnetization of magnetic moments would occur on superconducting bulks due to the crossed field effect. In our study, we employed the superconducting stacked tapes in a synchronous superconducting motor, which was designed and fabricated in our laboratory, aiming to lessen demagnetization due to crossed field effect in comparison with superconducting bulks. Applying the transverse AC field, the effects of frequency, amplitude, and number of cycles of the transverse magnetic field are discussed. Furthermore, a stack of 16 layers of superconducting tapes is modelled and the consequences of applying the crossed magnetic field on the sample are evaluated. The confrontation between experiments and simulation allows us to thoroughly understand the crossed field effects on stacked tapes. At the end, a preventive treatment, based on the shielding characteristic of superconductor and materials with high permeability, i.e. mu metal and metalic glass, is suggested. On the other hand, the shielding feature of aforementioned materials will hinder the penetration of magnetic field and, consequently, reduction of the demagnetization will be attained.

show abstract

Section: Introductionmentioning

confidence: 99%

Investigation of Demagnetization in HTS Stacked Tapes Implemented in Electric Machines as a Result of Crossed Magnetic Field

Baghdadi

Fagnard

Zhang

et al. 2015

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

show abstract

“…The temperature of the center of the bulk HTS reached 94.5 K and the cooling time was below 2 hours as shown in FIGURE 4 (a). This value of the temperature must be taken with great care, considering the thermocouples may not have been correctly attached to the bulk HTS; we consider it was most certainly near 80 K. Thanks to our PFM method using vortex-type copper winding coils, the trapped field reached 1.04 T [10]. These results lead to the conclusion that the characteristic cooling structure of the rotor plate is a successful design for bulk-HTS magnets.…”

Section: Cooling and Magnetizing Properties Of The Bulk-hts Motormentioning

confidence: 84%

Applied HTS Bulks and Wires to Rotating Machines for Marine Propulsion

Miki¹,

Felder²,

Kimura³

et al. 2010

AIP Conference Proceedings

View full text Add to dashboard Cite

“…As an example, the axial gap-type motor designed and realized in Japan can be mentioned here [5], [6]. This machine…”

Section: Introductionmentioning

confidence: 99%

3-D Modeling of Coils for Pulsed Field Magnetization of HTS Bulk Pellets in an Electrical Machine

Berger

Kapek

Colle

et al. 2018

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

Abstract-In this work, we propose to study and design a coil used to magnetize, by means of a Pulsed Field Magnetization (PFM) process, an inductor of a radial flux superconducting machine with one pair of poles. Each pole contains four similar HTS bulks of 30 mm diameter arranged in a square pattern. The cryostat already exists for this application and the temperature of the HTS bulks can vary from 4.2 K to their critical temperature, in transient state. For a given primary source of energy, here a capacitor bank of 10 kJ (5 mF, 2 kV) is available, the PFM process depends strongly on the value of the coil inductance used to generate pulsed field, because it defines the waveform of the current: peak value and time constant. Thus, 3D modeling of the coil is required in order to be sure that its inductance and the magnetic field produced will provide a full magnetization of HTS bulks. From the practical point of view, we would like to achieve an average magnetization of each pole around 3 T.In this paper, numerical modeling of coils with different number of turns coupled with circuit's equations is achieved. The maximum magnetic field obtained on the HTS bulks and estimated magnetization at the top center of each HTS bulk, are presented and discussed.

show abstract

Development of a synchronous motor with Gd–Ba–Cu–O bulk superconductors as pole-field magnets for propulsion system

Cited by 86 publications

References 5 publications

Investigation of Demagnetization in HTS Stacked Tapes Implemented in Electric Machines as a Result of Crossed Magnetic Field

Investigation of Demagnetization in HTS Stacked Tapes Implemented in Electric Machines as a Result of Crossed Magnetic Field

Applied HTS Bulks and Wires to Rotating Machines for Marine Propulsion

3-D Modeling of Coils for Pulsed Field Magnetization of HTS Bulk Pellets in an Electrical Machine

Contact Info

Product

Resources

About