Abstract
The use of superconductors in rotating electrical machinery results in high rotor stresses at cryogenic temperatures, and requires the availability of structural materials that must meet stringent performance requirements. This paper discusses the potential advantages of composite materials for such applications, the range of properties that may be achieved, and some preliminary experimental data that help define that potential. Some of the factors that arise due to anisotropy in terms of a particular design problem are considered. These are related to the example of a torque tube suitable for use in a superconducting ac generator.
Partially supported by National Bureau of Standards and Advanced Research Projects Agency.
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Abbreviations
- FR :
-
circumferential force per unit axial length of retainer due to field winding and winding support forces (equivalent to the product of the hoop stress times the thickness of the retainer)
- k:
-
thermal conductivity
- LE :
-
extension length
- Q:
-
rate of heat conduction
- TL :
-
shear flow
- tE :
-
extension thickness
- tR :
-
retainer thickness
- ϕ:
-
angle of principal stress σ1 with circumference
- σ1σ2 :
-
principal stresses
- σM :
-
torque tube self-induced circumferential stress due to centrifugal forces
- σθ:
-
retainer circumferential stress
- Tθz :
-
shear stress
- c:
-
fiber reinforced plastic composite
- s:
-
stainless steel
References
M. Van de Voorde, IEEE Trans. Nucl Sci. 20:693 (1973).
J. R. McLoughlin, in: “Materials Research for Superconducting Machinery,” NBS/ARPA Semi-Annual Report, AD 780 596 (March, 1974).
J. R. McLoughlin, in: “Materials Research for Superconducting Machinery,” NBS/ARPA Semi- Annual Report, AD-A004586 (October 1974).
A. Bejan, Cryogenics 14:313 (1974).
S. W. Tsai, “Strength Characteristics of Composite Materials,” NASA OR-226 (1965).
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© 1977 Springer Science+Business Media New York
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Hillig, W.B., Rios, P.A. (1977). Application of Fiber-Reinforced Polymers to Rotating Superconducting Machinery. In: Timmerhaus, K.D., Reed, R.P., Clark, A.F. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 22. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-9850-9_21
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DOI: https://doi.org/10.1007/978-1-4613-9850-9_21
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