Magnetic levitation using a stack of high temperature superconducting tape annuli

Patel, Anup; Hahn, Seungyong; Voccio, John; Baškys, Algirdas; Hopkins, Simon C.; Glowacki, B.A.

doi:10.1088/1361-6668/30/2/024007

Cited by 46 publications

(41 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…7gives a simple algebraic method for calculating the maximum levitation force (no differential equations of the type of (5) must be solved iteratively) and can be used for the fast estimation of the maximum performance and to compare the performance of different arrangement of PMs in ideal condition. The same results are obtained by means of the perfectly trapped flux (PTF) model in [28]- [29].…”

Section: A Numerical Modelsupporting

confidence: 71%

The Measurement and Modeling of the Levitation Force Between Single-Grain YBCO Bulk Superconductors and Permanent Magnets

Morandi

Fabbri

Ribani

et al. 2018

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

The levitation force between a single grain YBCO cylindrical bulk superconductor and a permanent magnet is investigated. The force measured both in zero field cooling and field cooling condition in the temperature range 20 K-80 K is reported. The dependence of peak levitation force and power dissipation on the temperature is analyzed and the saturation of the peak force with increasing the critical current of the material is pointed out. A numerical analysis is also carried out for understanding the electrodynamics of the levitation mechanism. Good reproduction of the measured data is obtained and relevant observed phenomena, such as hysteresis of the levitation cycle at high temperature and saturation of the peak force at low temperature, are explained by means of the model. Characterization of the material in terms of critical current density in the field range 0 T-0.5 T is also obtained by means of the numerical model by means of the fitting of the measured data.

show abstract

Section: A Numerical Modelsupporting

confidence: 71%

The Measurement and Modeling of the Levitation Force Between Single-Grain YBCO Bulk Superconductors and Permanent Magnets

Morandi

Fabbri

Ribani

et al. 2018

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

show abstract

“…The agreement for a SMB with a rolled stack was fair at 20 K and reasonable at 77 K [55]. For a SMB with a stack of annuli [63], the agreement was good. Similarly, a 3-D model was built to study the current pattern for the SMB with the rolled stack with limited discussion and validation [55].…”

Section: Introductionmentioning

confidence: 73%

Superconducting magnetic bearings simulation using an H-formulation finite element model

Quéval

Liu

Yang

et al. 2018

Supercond. Sci. Technol.

106

View full text Add to dashboard Cite

The modeling of superconducting magnetic bearing (SMB) is of great significance for predicting and optimizing its levitation performance before construction. Although lots of efforts have been made in this area, it still remains some space for improvements. Thus the goal of this work is to report a flexible, fast and trustworthy H-formulation finite element model. First the methodology for modeling and calibrating both bulk-type and stack-type SMB is summarized. Then its effectiveness for simulating SMBs in 2-D, 2-D axisymmetric and 3-D is evaluated by comparison with measurements. In particular, original solutions to overcome several obstacles are given: clarification of the calibration procedure for stack-type and bulk-type SMBs, details on the experimental protocol to obtain reproducible measurements, validation of the 2-D model for a stack-type SMB modeling the tapes real thickness, implementation of a 2-D axisymmetric SMB model, implementation of a 3-D SMB model, extensive validation of the models by comparison with experimental results for field cooling and zero field cooling, for both vertical and lateral movements. The accuracy of the model being proved, it has now a strong potential for speeding up the development of numerous applications including maglev vehicles, magnetic launchers, flywheel energy storage systems, motor bearings and cosmic microwave background polarimeters.

show abstract

“…Silver stabilizer be less than 0.4 mm from the cut surface [10]. It is a highly precise method for machining stacks that was also used to cut out the square void for the SuperPower stack as shown in Figure 5.…”

Section: Silver Stabilizermentioning

confidence: 99%

A trapped field of 17.7 T in a stack of high temperature superconducting tape

Patel

Baškys

Mitchell-Williams

et al. 2018

Supercond. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

High temperature superconducting (HTS) tape can be cut and stacked to generate large magnetic fields at cryogenic temperatures after inducing persistent currents in the superconducting layers. A field of 17.7 T was trapped between two stacks of HTS tape at 8 K with no external mechanical reinforcement. 17.6 T could be sustained when warming the stack up to 14 K. A new type of hybrid stack was used consisting of a 12 mm square insert stack embedded inside a larger 34.4 mm diameter stack made from different tape. The magnetic field generated is the largest for any trapped field magnet reported and 30% greater than previously achieved in a stack of HTS tapes. Such stacks are being considered for superconducting motors as rotor field poles where the cryogenic penalty is justified by the increased power to weight ratio. The sample reported can be considered the strongest permanent magnet ever created.

show abstract

Magnetic levitation using a stack of high temperature superconducting tape annuli

Cited by 46 publications

References 21 publications

The Measurement and Modeling of the Levitation Force Between Single-Grain YBCO Bulk Superconductors and Permanent Magnets

The Measurement and Modeling of the Levitation Force Between Single-Grain YBCO Bulk Superconductors and Permanent Magnets

Superconducting magnetic bearings simulation using an H-formulation finite element model

A trapped field of 17.7 T in a stack of high temperature superconducting tape

Contact Info

Product

Resources

About