Present status of R&amp;D on superconducting magnetic bearing technologies for flywheel energy storage system

Koshizuka, N.; Ishikawa, Fumihiko; Nasu, Hidetoshi; Murakami, Michiko; Matsunaga, Kentaro; Saito, S.; Saito, Osamu; Nakamura, Yu; Yamamoto, H.; Takahata, Ryoichi; Oka, Teruaki; Ikezawa, Hiroshi; Tomita, Masaru

doi:10.1016/s0921-4534(02)01374-6

Cited by 32 publications

(7 citation statements)

References 4 publications

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“…In the bulk superconductors, the structural defects with dimensions at nanoscale play an important role for flux pinning which supports a high performance in the levitation system [1][2][3][4]. For example, in low-temperature superconductors (LTSs) like Nb-Ti and Nb 3 Sn, the strongest pinning is supplied by a dense lamellar structure of normal -Ti ribbons, about 1 nm (0.2 , where denotes coherence length) thick and aligned parallel to the wire transport current in Nb-Ti [5], and by grain boundaries in Nb 3 Sn [6][7][8].…”

Section: Introductionmentioning

confidence: 94%

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Enhancement of flux pinning in GdBa2Cu3O7−y bulks prepared by nanoparticle-powder-assisted method

Cheng

Hsieh

et al. 2011

J. Mod. Transport.

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High quality GdBa 2 Cu 3 O 7-y (Gd123) textured bulks with Nd 2 BaCuO 5 (Nd211) nanoparticle precipitations have been fabricated by a nanoparticle-powders-assisted MTG (melt-textured-growth) technique. The high density nanoscale flux pinning sites were introduced into Gd123 by mixing Nd211 nanoparticle powders (about 20-50 nm) with Gd123 nano-precursors before the MTG process. Microstructural analyses reveal that a large number of Nd211 nanoparticles with a size around 50-150 nm were inserted in the Gd123 matrix, forming a kind of superconducting nanocomposites. The critical current density at 77 K is systematically increased and the flux pinning behavior is significantly improved. The scaling behavior of the flux pinning force shows a magnetic field dependent feature with a peak located at h p 0.4. This may be the fingerprint of melt-textured 123 compounds, which cannot be interpreted by the simple superposition of different types of elementary pinning sources.

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Section: Introductionmentioning

confidence: 94%

“…evitation force between a high temperature superconducting bulk and a permanent magnet has many potential applications including flywheels-based energy storage system [1], superconducting bearings [2], transportation [3], and Maglev trains [4].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of flux pinning in GdBa2Cu3O7−y bulks prepared by nanoparticle-powder-assisted method

Cheng

Hsieh

et al. 2011

J. Mod. Transport.

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“…A FESS is a viable technology for energy storage because it is environmentally safe, can sustain infinite charge/discharge cycles, and has higher power-to-weight ratio than chemical batteries [1]. FESSs commonly use active magnetic bearings (AMBs) for contact-free operation to maximize the efficiency of the system.…”

Section: Introductionmentioning

confidence: 99%

Design of magnetically levitated rotors in a large flywheel energy storage system from a stability standpoint

et al. 2010

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The stability of flywheels in an energy storage system supported by active magnetic bearings (AMBs) is studied in this paper. We designed and built two flywheel energy storage systems (FESS) that can store up to 5 kWh of usable energy at a maximum speed of 18,000 rpm. One is optimized to store as much energy as possible, resulting in a flywheel with a strong gyroscopic coupling. The other has a much smaller gyroscopic coupling for ease of control. To analyze the stability of the system accurately, we derived the dynamic models of the rotor using finite-element method and integrated them with the models of the bearings, amplifiers, and sensors to obtain the simulation model of the system. We validated the model through experiments and compared the stability of these two systems.

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“…Flywheel storage/attitude control as the key technology has become the hot topic in related fields [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Generally, a flywheel storage/attitude control system is composed of the flywheel, axis, bearing, motor/ generator, vacuum box, and electric power system.…”

Section: Introductionmentioning

confidence: 99%

Performance investigation on ultrasonic levitation axial bearing for flywheel storage system

Peng

Yang

Kan

et al. 2009

Front. Mech. Eng. China

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The bearing is an important basic mechanical part for supporting a shaft. A flywheel storage system needs a type of noncontact support bearing to enhance the speed of the axis. A magnetic suspension bearing is one type of noncontact bearing but has electromagnetic interference to other electric equipment. Based on the performance research of ultrasonic levitation technology, a novel noncontact bearing called ultrasonic bearing is presented, which consists of a special piezoelectric vibrator supporting the load. Experiments are carried out to study the relationships among the amplitude of the vibrator and levitation clearance, the highest speed of the axis, and the frictional moment of the axis. Results show that the levitation clearance becomes smaller gradually with increasing load; the rotation speed is up to 8946 r/min, and the friction moment is only 2.095Â10 -5 N$m when the levitation clearance is 8.53 μm. The ultrasonic bearing is highlighted because of its simple structure, strong levitation ability, and low friction moment.

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Present status of R&D on superconducting magnetic bearing technologies for flywheel energy storage system

Cited by 32 publications

References 4 publications

Enhancement of flux pinning in GdBa2Cu3O7−y bulks prepared by nanoparticle-powder-assisted method

Enhancement of flux pinning in GdBa2Cu3O7−y bulks prepared by nanoparticle-powder-assisted method

Design of magnetically levitated rotors in a large flywheel energy storage system from a stability standpoint

Performance investigation on ultrasonic levitation axial bearing for flywheel storage system

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