The direct relationship between output power and current carrying capability of rotor bars in HTS induction/synchronous motor with the use of DI-BSCCO tapes

Nakamura, Taketsune; Nagao, Kazunori; Nishimura, Tatsuo; Ogama, Y; Kawamoto, Makoto; Okazaki, Tadashi; Ayai, N.; Oyama, Hitoshi

doi:10.1088/0953-2048/21/8/085006

Cited by 20 publications

(26 citation statements)

References 15 publications

(22 reference statements)

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“…In order to fabricate a high-temperature superconducting induction/synchronous motor [16][17][18], the rotor winding in a commercially available induction motor is replaced by an MgB 2 squirrel-cage-type winding. The MgB 2 wire used for the rotor winding has the three-layer structure of a mono-cored have already been published [12].…”

Section: Rotation Tests Of Superconducting Motormentioning

confidence: 99%

Development of a Liquid Hydrogen Transfer Pump System with MgB2 Wires*1

一弘¹,

広嗣²,

拓郎³

et al. 2012

TEION KOGAKU

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An electric pump composed of an MgB2 motor is combined with superconducting level sensors using thin CuNi-sheathed MgB2 wires to transfer liquid hydrogen. An impeller is attached to the lower end of a rotating shaft on the MgB2 motor and covered with an outer casing to form a centrifugal pump. Then, the MgB2 motor and impeller are placed vertically inside a cryostat with an infill of liquid hydrogen. A glass Dewar vessel is prepared to receive the liquid hydrogen transferred from the cryostat containing the MgB2 motor. The MgB2 sensors are used not only to detect the level of liquid hydrogen but also to control the electric pump on the basis of their pre-estimated calibration curves. By using the assembled pump system, the liquid hydrogen is successfully transferred from the cryostat to the glass Dewar vessel via a transfer tube. / 21Highlights: A pump system composed of an MgB 2 motor and MgB 2 level sensors was constructed. The centrifugal pump was formed by attaching an aluminum impeller to the motor. A glass Dewar vessel receives the liquid hydrogen from a cryostat for the pump. The MgB 2 sensors were used to detect the liquid level and to control the motor. Transfer of liquid hydrogen was successfully carried out with the pump system. liquid hydrogen but also to control the electric pump on the basis of their pre-estimated calibration curves. By using the assembled pump system, the liquid hydrogen is successfully transferred from the cryostat to the glass Dewar vessel via a transfer tube.

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Section: Rotation Tests Of Superconducting Motormentioning

confidence: 99%

Development of a Liquid Hydrogen Transfer Pump System with MgB2 Wires*1

一弘¹,

広嗣²,

拓郎³

et al. 2012

TEION KOGAKU

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“…The further advantages including the above-mentioned benefits in the proposed induction/synchronous motor for the liquid hydrogen pump are summarized as follows [12]- [15]: 1) Coexistence of slip and synchronous modes. 2) Low loss and high efficiency.…”

Section: Proposal Of Superconducting Motor For Liquid Hydrogen Pumpmentioning

confidence: 99%

“…Table IV shows an example of the outline design of induction/synchronous motor with the MgB 2 wire. Based on the equivalent circuit analysis for the superconducting induction/synchronous motor [12]- [15], the maximum synchronous torque τ sm is theoretically expressed by…”

Section: Outline Design Of Rotor Windingmentioning

confidence: 99%

“…It is assumed that the total leakage inductance ℓ ′ at the liquid hydrogen temperature is equal to that for the room temperature [13]- [15]. On the other hand, the primary winding resistance r 1 is obtained under the assumption that the residual resistance ratio (RRR), which is defined here by the ratio of the resistance at an operating temperature of the conventional motor to the resistance at 20 K, is a hundred for the copper.…”

Section: Outline Design Of Rotor Windingmentioning

confidence: 99%

“…In this paper, a superconducting induction/synchronous motor [10]- [15] for circulation or transfer of the liquid and/or slush hydrogen is presented as one of the low-field applications of the MgB 2 wires. This motor enables us to drive a pump to circulate or transfer the liquid/slush hydrogen with very low power consumption, and would form one of the infrastructure components in the near-future society with hydrogen utilization.…”

Section: Introductionmentioning

confidence: 99%

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Proposal of a Fully Superconducting Motor for Liquid Hydrogen Pump With MgB<formula formulatype="inline"><tex Notation="TeX">$_{2}$</tex> </formula> Wire

Komori

Nakamura

2009

IEEE Trans. Appl. Supercond.

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Abstract-The outline design of a fully superconducting motor for liquid hydrogen pump with a magnesium-diboride (MgB2) superconducting wire is carried out to present various advantages arising from its prospective performances. The squirrel-cage rotor winding composed of superconducting loops with the MgB2 wire enables us to operate the motor not only in a slip mode but also in a synchronous rotation mode, and consequently the rotor winding loss can be suppressed drastically. Furthermore, it would be expected that the stator winding loss becomes smaller by using the MgB2 wire compared with familiar normal metals as typified by a copper. The time evolution of magnetic field distribution around the stator winding is obtained by means of a finite element analysis in order to estimate the AC loss and the primary circuit resistance.

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Thermal Release of Hidden Magnetic Moments in High T c Bi:2223/Ag Superconducting Tape During Warming to T c

Çelebi

LeBlanc

2011

J Supercond Nov Magn

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We report on measurements of the evolution of the magnetization M , upon warming from T 0 (77 K) to T c , for Bi:2223/Ag tape prepared by the continuous filling and forming (CTFF) with the locus of M initially situated along bridges between the envelopes of the major hysteresis curves. Concentric, oppositely directed magnetic moments coexist in the specimens when M lies along the bridges. We focused on the cases where M = 0, hence before warming, the constituent moments cancel each other exactly. Since they diminish in magnitude at different rates as T is increased to T c , their sequential "release" leads to a rich variety of phenomena. A comparison of experimental and theoretical results shows that our simple model semiquantitatively reproduces the major features of the observations on the specimen of Bi:2223/Ag tape.

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The direct relationship between output power and current carrying capability of rotor bars in HTS induction/synchronous motor with the use of DI-BSCCO tapes

Cited by 20 publications

References 15 publications

Development of a Liquid Hydrogen Transfer Pump System with MgB2 Wires*1

Development of a Liquid Hydrogen Transfer Pump System with MgB2 Wires*1

Proposal of a Fully Superconducting Motor for Liquid Hydrogen Pump With MgB<formula formulatype="inline"><tex Notation="TeX">$_{2}$</tex> </formula> Wire

Thermal Release of Hidden Magnetic Moments in High T c Bi:2223/Ag Superconducting Tape During Warming to T c

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