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Effect of Winding Tension, Support Material, and Epoxy Impregnation on the Strain and Critical Current of YBCO Coil.

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Title: Effect of Winding Tension, Support Material, and Epoxy Impregnation on the Strain and Critical Current of YBCO Coil.
Authors: Liu, Liyuan1, Chen, Wei1, Zhang, Haiyang1, Yang, Xinsheng1, Zhang, Yong1, Yang, Ye2, Zhao, Yong3
Source: IEEE Transactions on Applied Superconductivity. Mar2017, Vol. 27 Issue 2, p1-7. 7p.
Subjects: Critical currents, Epoxy insulators, Tensile strength, Electric coils, Winding machines -- Tension control
Abstract: The critical current (Ic) of epoxy impregnated YBCO coil is prone to degrade due to the cumulative radial tensile stress. Winding tension has the advantage to reduce the amount of epoxy resin and decrease the radial tensile stress during cool down process. In this paper, the dry and wet coils wound on copper and polytetrafluoroethylene (PTFE, Teflon) bobbin materials with various winding tensions were manufactured and tested. With increasing the winding tension, the winding strain increased but the thermal strain reduced. The low coefficient of thermal expansion for bobbin and epoxy impregnation could decrease thermal contraction of the innermost layer of coil. The winding tension effectively reduced the degradation of epoxy impregnated YBCO coil. The bobbin materials and winding tension of 10–50 N had no effect on the degradation of Ic. A proper winding tension of 20 N was successfully used to fabricate an epoxy impregnated YBCO coil of 30 turns without degradation [ABSTRACT FROM PUBLISHER]
Copyright of IEEE Transactions on Applied Superconductivity is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Effect of Winding Tension, Support Material, and Epoxy Impregnation on the Strain and Critical Current of YBCO Coil.
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  Data: <searchLink fieldCode="JN" term="%22IEEE+Transactions+on+Applied+Superconductivity%22">IEEE Transactions on Applied Superconductivity</searchLink>. Mar2017, Vol. 27 Issue 2, p1-7. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Critical+currents%22">Critical currents</searchLink><br /><searchLink fieldCode="DE" term="%22Epoxy+insulators%22">Epoxy insulators</searchLink><br /><searchLink fieldCode="DE" term="%22Tensile+strength%22">Tensile strength</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+coils%22">Electric coils</searchLink><br /><searchLink fieldCode="DE" term="%22Winding+machines+--+Tension+control%22">Winding machines -- Tension control</searchLink>
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  Label: Abstract
  Group: Ab
  Data: The critical current (Ic) of epoxy impregnated YBCO coil is prone to degrade due to the cumulative radial tensile stress. Winding tension has the advantage to reduce the amount of epoxy resin and decrease the radial tensile stress during cool down process. In this paper, the dry and wet coils wound on copper and polytetrafluoroethylene (PTFE, Teflon) bobbin materials with various winding tensions were manufactured and tested. With increasing the winding tension, the winding strain increased but the thermal strain reduced. The low coefficient of thermal expansion for bobbin and epoxy impregnation could decrease thermal contraction of the innermost layer of coil. The winding tension effectively reduced the degradation of epoxy impregnated YBCO coil. The bobbin materials and winding tension of 10–50 N had no effect on the degradation of Ic. A proper winding tension of 20 N was successfully used to fabricate an epoxy impregnated YBCO coil of 30 turns without degradation [ABSTRACT FROM PUBLISHER]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of IEEE Transactions on Applied Superconductivity is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1109/TASC.2017.2655012
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        Text: English
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      – SubjectFull: Critical currents
        Type: general
      – SubjectFull: Epoxy insulators
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      – SubjectFull: Tensile strength
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      – SubjectFull: Electric coils
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      – SubjectFull: Winding machines -- Tension control
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      – TitleFull: Effect of Winding Tension, Support Material, and Epoxy Impregnation on the Strain and Critical Current of YBCO Coil.
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              Text: Mar2017
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