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Development of direct current heteropolar machines with superconducting field windings


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Green, MJI 1981 , 'Development of direct current heteropolar machines with superconducting field windings', Research Master thesis, University of Tasmania.

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A practical and theoretical study of direct current heteropolar
machines with superconducting field windings was conducted with the aim
of proving their technical feasibility and to indicate their advantages
and disadvantages over machines of more conventional design. These studies
were conducted in conjunction with extensive tests on small superconducting
D.C. machines of various formats.
Three stages of machine development occurred. In the first stage
machine the superconducting field winding was shielded from armature
reaction fluxes with the aid of iron and compensating windings.
In the second stage machine the superconducting field winding was
subjected to the full effects of the armature reaction fluxes.
Tests conducted with these machines indicated that the operation of
the superconducting field winding was not influenced by the flow of armature
currents. A third, four pole superconducting D.C. machine which exhibits
all the advantages gained by using superconductors in the field windings
has been constructed. This machine has most of the construction features
of a full size prototype machine for future industrial applications. As
a result of difficulties encountered in inducing the superconducting state
into the field windings operational tests on this machine could not be
conducted. Possible reasons for the difficulties are discussed with the
result that some of the reasons are rejected and measures that could
overcome the difficulties are forwarded.
The project began with no experience in cryogenics, cryostat design
and construction nor superconductivity. Consequently details of practical
techniques utilised during the project are included.
Continued development of superconducting heteropolar D.C. machines
should prove that the design and operation of a prototype machine with
a rating in excess of 10 MW is possible. This is essential if this type
of machine is to make any impact in the future. Providing the expectation
that voltage per commutator bar limits can be substantially increased
is realised, machine ratings that are limited only by armature cooling
should be possible.

Item Type: Thesis - Research Master
Authors/Creators:Green, MJI
Keywords: Low temperature engineering, Superconductors
Copyright Holders: The Author
Copyright Information:

Copyright 1982 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (M.Eng.Sc.)--University of Tasmania, 1982

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