High temperature superconducting (HTS) tape can be cut and stacked to generate large magnetic fields at cryogenic temperatures after inducing persistent currents in the layers. A field of 17.7 T was trapped between two stacks HTS 8 K with no external mechanical reinforcement. 17.6 could sustained when warming stack up 14 K. new type hybrid used consisting a 12 mm square insert embedded inside larger 34.4 diameter made from different tape. The generated is largest for any magnet reported 30%...

Stacks of large width superconducting tape can carry persistent currents over similar length scales to bulk superconductors, therefore giving them potential for trapped field magnets and magnetic levitation. 46 mm wide high temperature has previously been cut into square annuli create a 3.5 T mode magnet. The same pieces were used here form composite hollow cylinder with an inner bore 26 mm. Magnetic levitation was achieved by cooling pair rare-earth magnets. This paper reports the axial...

The potential of (RE)BCO superconducting bulks in rotating machine designs has been explored through numerous experimental prototypes, with the being magnetized to act as held poles. However, stacks tapes have emerged a promising alternative for trapped magnets partly because their suitability pulsed-field method magnetization, which is considered most practical trapping flux. benefits using stack rotor poles suitable motors are reported. ability long rectangular allows motor more efficient...

Stacks of superconducting tape can be used as composite bulk superconductors for both trapped field magnets and magnetic levitation. Little previous work has been done on quantifying the levitation force behavior between stacks permanent magnets. This paper reports axial properties wound into pancake coils to act a cylinder, showing that similar stable forces those expected from uniform cylinder are possible. Force creep was also measured simulated system. The geometry tested is possible...

Electric propulsion for long distance aircraft requires very high power densities likely only possible with superconducting machines. There have been a number of motor design and prototype studies but few that are fully superconducting. Radial topologies the stator rotor geometry, qualitatively compared in context motors aimed at electric previously published prototypes. AC magnetic fields experienced by components leads to loss, which lowers efficiency imposes cryogenic heat penalty. The...

Design requirements of the next generation electric aircraft place stringent on power density required from motors. A future prototype planned in scope European project 'Advanced Superconducting Motor Experimental Demonstrator' (ASuMED) considers a permanent magnet synchronous motor, where conventional ferromagnets are replaced with superconducting trapped field magnets, which promise higher flux densities and thus output without adding weight. Previous work has indicated that stacks tape...

(RE)Ba <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">7-δ</sub> bulks are well known for their ability to trap high magnetic fields; however, it has been recently shown by the current authors that stacks of commercial YBCOcoated conductor tape can outperform YBCO similar size at temperatures below 60 K due superior thermal stability during...

Stacks of commercial high-temperature superconducting tape can be cut and soldered together to form slabs a large range shapes sizes. They are most interesting for magnetic levitation applications due the flexibility geometry, allowing them created in thin suitable planar rotary bearings linear maglev bearings. In this paper, axial force was measured between field cooled slab 30 × mm 25-mm-diameter rare-earth permanent magnet (PM), which produced cylindrically symmetric necessary context The...

Stacks of high temperature superconducting tape have proved to trap in laboratory conditions levels magnetic flux density one order magnitude above actual state-of-the-art permanent magnets.Their simple manufacturing, mechanical properties and intrinsic resistance sudden quench greatly facilitate their utilization industrial applications, amongst them, as source the rotor electrical machines.For this happen, currents induced layers stack must not be disturbed during operation.This work...

High temperature superconducting (HTS) bulks or stacks of coated conductors (CCs) can be magnetized to become trapped field magnets (TFMs). The magnetic fields such TFMs break the limitation conventional (<2 T), so they show potential for improving performance many electrical applications that use permanent like rotating machines. Towards practical commercial TFMs, effective in situ magnetization is one key issues. pulsed (PFM) among most promising methods virtue its compactness, mobility...

The trapped magnetic field profile of stacks GdBa2Cu3O7−x superconducting tape was investigated. Angled were magnetized and found to produce very uniform profiles. angled made 12 mm × 24 solder coated pieces bonded together following a brief consolidation heat treatment. Layering multiple adding ferromagnetic plate beneath the samples both enhance magnitude uniformity Stationary time-dependent critical state finite element models also developed complement experimental results investigate...

Stacks of high temperature superconducting tape, magnetized using pulsed fields, provide a new type permanent magnet superconductors. To optimize the trapped field in such stacks, role stabilization layers was investigated by pulse magnetizing 12 mm square stack 15 tape over range 15–77 K. The stacks consisted commercial with silver stabilizer 1–3 μm or an additional 20 layer copper on top 1 silver. It found that and flux are relatively insensitive to thickness, only, led highest field. An...

High temperature superconducting (HTS) tape can be cut and stacked to form composite bulks capable of generating fields as high 17.7 T, the highest any trapped field magnet. This makes them most powerful permanent magnets accounting for need maintain a cryogenic temperature. penalty is increasingly being justified due significantly higher power densities (>10kW/Kg) fully motors enable by using magnetized stacks on rotor HTS coils stator. Design considerations motor aerospace applications...

Stacks of high-temperature superconducting tape can be magnetized to produce a variety different trapped field profiles in addition the most common conical or pyramidal profiles. using discarded Roebel cable offcuts were created investigate various stacking arrangements with aim creating stack that uniform for potential applications such as NMR. A new angled arrangement proved flattest, all overlapping and has scaled up. FEM modeling COMSOL was also performed complement measurements explain...

Superconducting technology offers the prospect of sharply increasing power density rotating electrical machines, especially in low-speed, high-torque range, with impact applications such as wind energy and aircraft propulsion. Among enabling technologies, stacks consisting piled up layers high-temperature superconductors may provide a source magnetic flux for torque production, without complexity superconducting wound rotor poles. For this to happen, careful designs optimizing...

Stacks of superconducting tape, made second-generation coated conductors, present an interesting alternative to bulk superconductors. The layered geometry allows incorporation other functional, namely ferromagnetic, materials. ferromagnetic material changes the field configuration within superconductor and can be used shape or divert flux density from its interior. This optimise remanent after magnetisation. FEM simulations are employed test performance a variety superconductor/ferromagnet...

A hybrid electric configuration for aircraft propulsion yields several advantages, such as reducing the fuel consumption and takeoff distance, improving control, decreasing emissions. For a scenario to occur, advances designed increase power-to-weight ratio of actual motors must be developed. Superconducting technologies offer prospect achieving performances but at cost increased design construction complexities. In that sense, stacks high-temperature superconductors have proven trap...

Stacks of superconducting (SC) tapes can trap much higher magnetic fields than conventional magnets. This makes them very promising for motors and generators. However, ripple in these machines present a cross-field component that demagnetizes the stacks. At present, there is no quantitative agreement between measurements modeling demagnetization, mainly due to need 3D model takes end effects real micron-thick SC layer into account. article presents demagnetization stacks up 5 initial...

Stacks of superconducting (RE)BCO tape are gaining popularity as a potential alternative for bulks trapped field applications. This is partly due to versatility and uniformity the starting material, allowing more deterministic prediction profile magnitude. However, most FEM models magnets do not incorporate parameters such critical current n-value dependence on angle applied magnetic field, leading only qualitative modeling results. More quantitative results can be obtained from...

A novel manufacturing technology to produce infinitely long and cost-effective MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> superconductive wires has been developed. The process consists of powder purification in a controlled atmosphere unique feeding allowing micrometer-sized Mg Cu powders nano-sized B dopant be fed continuously "U"-shaped stainless steel bimetallic sheath material. Laser seam welding applied seal the conductor...

In recent years, the phase formation sequence during heat treatment of Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn wires, and influence microstructure compositional homogeneity on in-field critical current (I xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> ), have received increasing attention. For RRP importance understanding managing ternary nausite has been demonstrated. However, a published Cu-Nb-Sn diagram including...

Pulsed field magnetization is the most practical method of magnetizing a (RE)BCO bulk, however large heat generation limits trapped to significantly less than possible using cooling. Modelling has been used show that effective removal from bulk interior, embedded metallic structures, can enhance by increasing thermal stability. The reported results are for experimental pulsed thin walled YBCO sample with 55 vertical holes high conductivity wires. A specially designed copper coldhead was...

As superconducting materials find their way into applications, there is increasing need to verify performance at operating conditions. Testing of critical current with respect temperature and magnetic field particular importance. However, testing facilities covering a range temperatures fields can be costly, especially when considering the cooling power required in cryogenic system below 65 K (inaccessible for LN2). Critical currents excess 500 A are common commercial samples, making such...