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Calculation of alternating current losses in stacks and coils made of second generation high temperature superconducting tapes for large scale applications
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10.1063/1.4827375
/content/aip/journal/jap/114/17/10.1063/1.4827375
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/17/10.1063/1.4827375

Figures

Image of FIG. 1.
FIG. 1.

The computational domain represents the cross-section of an infinitely long bundle of conductors. The superconducting regions are denoted by , the normal conductors by , and the air or insulation by . Neither nor need to be connected. The boundary of the computational domain is denoted by . The arrow points to the conductor which carries a net current .

Image of FIG. 2.
FIG. 2.

Stack of coated conductor superconducting tapes as a periodic array of unit cells with height . The zoomed image (right) shows the internal layered structure of each unit cell.

Image of FIG. 3.
FIG. 3.

Homogenization of a stack of tapes. The labels , and denote each of the tapes in the actual stack (left) and the homogeneous-medium equivalent (right), respectively.

Image of FIG. 4.
FIG. 4.

Discretization of the homogenous bulk domain into smaller subdomains.

Image of FIG. 5.
FIG. 5.

Magnetic flux density magnitude B [T] for half AC cycle in a stack of 32 tapes in the transport current case. Results shown at different phase values: from π to 2π in π/4 increments (from left to right). For visualization purposes, domain edges are not plotted. Top: actual stack. Bottom: anisotropic bulk model. The actual width of the superconducting layers is 4 mm while the height of the stack is 9.376 mm. The separation between ticks in the plot frames is 1 mm.

Image of FIG. 6.
FIG. 6.

Normalized current density for half an AC cycle in a stack of 32 tapes in the transport current case. Results shown at different phase values: from π to 2π in π/4 increments (from left to right). Top: Actual stack of tapes. For visualization purposes, the superconducting layers’ actual thickness is artificially expanded in the vertical direction. Bottom: Anisotropic bulk model. The actual width of the superconducting layers is 4 mm, while the height of the stack is 9.376 mm.

Image of FIG. 7.
FIG. 7.

Instantaneous loss [W/m] for the actual stack of 32 tapes (dashed line) and its anisotropic bulk model (solid line) in the transport current case.

Image of FIG. 8.
FIG. 8.

Magnetic flux density magnitude [T] for half an AC cycle in a stack of 32 tapes for the magnetization case. A sinusoidal magnetic flux density of 100 mT at 50 Hz was applied vertically to the stack. Results shown at different phase values: from π to 2π in π/4 increments (from left to right). Top: Actual stack. Bottom: Anisotropic bulk model. The actual width of the superconducting layers is 4 mm while the height of the stack is 9.376 mm. The separation between ticks in the plot frames is 1 mm. For visualization purposes, domain edges are not plotted.

Image of FIG. 9.
FIG. 9.

Normalized current density for half an AC cycle in a stack of 32 tapes in the magnetization case. Results shown at different phase values: from π to 2π in π/4 increments (from left to right). Top: Actual stack of tapes. For visualization purposes, only data for the superconducting layers’ is plotted. The superconducting layers’ true thickness is artificially expanded in the vertical direction. Bottom: Anisotropic bulk model. The actual width of the superconducting layers is 4 mm while the height of the stack is 9.376 mm.

Image of FIG. 10.
FIG. 10.

Instantaneous loss [W/m] for the actual stack of 32 tapes (dashed line) and its anisotropic bulk model (solid line) in the magnetization case.

Image of FIG. 11.
FIG. 11.

Rectangular edge element.

Image of FIG. 12.
FIG. 12.

Triangular edge element.

Tables

Generic image for table
Table I.

Parameter values used for simulations.

Generic image for table
Table II.

AC losses, transport current case.

Generic image for table
Table III.

Computing time, transport current case.

Generic image for table
Table IV.

AC losses, applied magnetic field case.

Generic image for table
Table V.

Computing time, applied magnetic field case.

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/content/aip/journal/jap/114/17/10.1063/1.4827375
2013-11-01
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Calculation of alternating current losses in stacks and coils made of second generation high temperature superconducting tapes for large scale applications
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/17/10.1063/1.4827375
10.1063/1.4827375
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