A study on electromagnetic and mechanical characteristics of the field coil in HTS motor

S. B. Kim; T. Kadota; J. H. Joo; H. Sano; S. Murase; S. H. Lee; J. P. Hong; H. M. Kim; Y. K. Kwon; Y. S. Jo

doi:10.1016/j.physc.2010.05.201

A study on electromagnetic and mechanical characteristics of the field coil in HTS motor

S. B. Kim, T. Kadota, J. H. Joo, H. Sano, S. Murase, S. H. Lee, J. P. Hong, H. M. Kim, Y. K. Kwon, Y. S. Jo

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

High temperature superconducting (HTS) motors electromagnetically consist of a rotator wound with HTS wires and an armature with conventional copper wires like Litz wire. The HTS rotor windings, as field coils, consist of a straight part and an end-ring part. Because a major rotation torque is induced by an interaction between magnetic fields and current-carrying conductors in the straight part, most of mechanical stresses in the motor occur at the straight part. An end-ring is placed in the edge of the straight part and used to connect to each adjacent straight-part coils. The magnetic fields by coil currents concentrate on the end-ring part, therefore, it is expected that the critical current of the entire coil, straight and end-ring, can be determined by the magnitude of the field in the end-ring. This paper deals with the overall Jc degradation in the end-ring part by self-field generated from the coil. In addition to electromagnetic analyses, we have performed a numerical analysis in order to evaluate mechanical stresses in the straight part of field coil by armature reaction on steady-state operation. The analytical results will be presented in this paper.

Original language	English
Pages (from-to)	1756-1762
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	470
Issue number	20
DOIs	https://doi.org/10.1016/j.physc.2010.05.201
Publication status	Published - Nov 1 2010

Keywords

HTS motor
Mechanical stress
Racetrack coil

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/j.physc.2010.05.201

Cite this

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title = "A study on electromagnetic and mechanical characteristics of the field coil in HTS motor",

abstract = "High temperature superconducting (HTS) motors electromagnetically consist of a rotator wound with HTS wires and an armature with conventional copper wires like Litz wire. The HTS rotor windings, as field coils, consist of a straight part and an end-ring part. Because a major rotation torque is induced by an interaction between magnetic fields and current-carrying conductors in the straight part, most of mechanical stresses in the motor occur at the straight part. An end-ring is placed in the edge of the straight part and used to connect to each adjacent straight-part coils. The magnetic fields by coil currents concentrate on the end-ring part, therefore, it is expected that the critical current of the entire coil, straight and end-ring, can be determined by the magnitude of the field in the end-ring. This paper deals with the overall Jc degradation in the end-ring part by self-field generated from the coil. In addition to electromagnetic analyses, we have performed a numerical analysis in order to evaluate mechanical stresses in the straight part of field coil by armature reaction on steady-state operation. The analytical results will be presented in this paper.",

keywords = "HTS motor, Mechanical stress, Racetrack coil",

author = "Kim, {S. B.} and T. Kadota and Joo, {J. H.} and H. Sano and S. Murase and Lee, {S. H.} and Hong, {J. P.} and Kim, {H. M.} and Kwon, {Y. K.} and Jo, {Y. S.}",

note = "Funding Information: This work was supported by the Ministry of Education, Science and Technology, Republic of Korea, under a grant from the Center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program.",

year = "2010",

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T1 - A study on electromagnetic and mechanical characteristics of the field coil in HTS motor

AU - Kim, S. B.

AU - Kadota, T.

AU - Joo, J. H.

AU - Sano, H.

AU - Murase, S.

AU - Lee, S. H.

AU - Hong, J. P.

AU - Kim, H. M.

AU - Kwon, Y. K.

AU - Jo, Y. S.

N1 - Funding Information: This work was supported by the Ministry of Education, Science and Technology, Republic of Korea, under a grant from the Center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program.

PY - 2010/11/1

Y1 - 2010/11/1

N2 - High temperature superconducting (HTS) motors electromagnetically consist of a rotator wound with HTS wires and an armature with conventional copper wires like Litz wire. The HTS rotor windings, as field coils, consist of a straight part and an end-ring part. Because a major rotation torque is induced by an interaction between magnetic fields and current-carrying conductors in the straight part, most of mechanical stresses in the motor occur at the straight part. An end-ring is placed in the edge of the straight part and used to connect to each adjacent straight-part coils. The magnetic fields by coil currents concentrate on the end-ring part, therefore, it is expected that the critical current of the entire coil, straight and end-ring, can be determined by the magnitude of the field in the end-ring. This paper deals with the overall Jc degradation in the end-ring part by self-field generated from the coil. In addition to electromagnetic analyses, we have performed a numerical analysis in order to evaluate mechanical stresses in the straight part of field coil by armature reaction on steady-state operation. The analytical results will be presented in this paper.

AB - High temperature superconducting (HTS) motors electromagnetically consist of a rotator wound with HTS wires and an armature with conventional copper wires like Litz wire. The HTS rotor windings, as field coils, consist of a straight part and an end-ring part. Because a major rotation torque is induced by an interaction between magnetic fields and current-carrying conductors in the straight part, most of mechanical stresses in the motor occur at the straight part. An end-ring is placed in the edge of the straight part and used to connect to each adjacent straight-part coils. The magnetic fields by coil currents concentrate on the end-ring part, therefore, it is expected that the critical current of the entire coil, straight and end-ring, can be determined by the magnitude of the field in the end-ring. This paper deals with the overall Jc degradation in the end-ring part by self-field generated from the coil. In addition to electromagnetic analyses, we have performed a numerical analysis in order to evaluate mechanical stresses in the straight part of field coil by armature reaction on steady-state operation. The analytical results will be presented in this paper.

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KW - Racetrack coil

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A study on electromagnetic and mechanical characteristics of the field coil in HTS motor

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Keywords

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