Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Including superconductivity
Patent
1993-12-28
1996-06-04
Thompson, Gregory D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Including superconductivity
335216, 505211, 323360, G01R 3320, H01F 722
Patent
active
055239145
DESCRIPTION:
BRIEF SUMMARY
Subject matter of the invention is an inductive superconducting current storage, characterized in that it comprises an inner coil wound from superconducting material and an outer coil wound from superconducting material and disposed around the inner coil in spaced manner therefrom, said inner coil and said outer coil in operation having current flowing therethrough in opposite directions so that the same magnetic flux as in the inner space of the inner coil, but of opposite direction, is present in the annular space between inner coil and outer coil.
Inductive superconducting current storages or accumulators having a cylindrical coil as most essential component are known. With such current storages the magnetic field present in the inner space of the coil passes outwardly at the two coil ends and is closed outside of the coil so that a magnetic field having as a rule a very high magnetic field strength is present in the vicinity of the coil.
In the current storage according to the invention, the magnetic circuit in contrast thereto extends in a first axial direction through the inner space of the inner coil and then extends in the opposite, second axial direction through the annular space between inner coil and outer coil so that--apart from portions close to the two face ends of the coil assembly--there is virtually no magnetic field outside of the coil assembly. The magnetic field is compensated or fed back in the coil assembly.
The term "superconducting material" on the one hand refers to as a rule metallic materials which are superconductive only at temperatures very little above absolute zero and which have been known for quite some time. On the other hand, this term also applies to the mostly ceramic materials which are still superconducting at a considerable distance in temperature from absolute zero and which have been known for a few years only. These materials often are called high-temperature superconductors, with the temperature of liquid nitrogen being usable as classification limit; according to this classification, high-temperature superconductors are superconductors which are still superconducting at least at the boiling temperature of liquid nitrogen.
The windings of the inner and outer coils as well as the magnetic flux cross-sections of the annular space and the inner space preferably are designed such that at least substantially the same magnetic flux densities result in the annular space and in the inner space. This holds also for the circumferences of inner coil and outer coil. The superconducting material of the two coils may be put to practical use at all locations.
The inner coil and the outer coil usually form part of a common storage circuit. For being able to (completely or partly) discharge the storage circuit, the storage circuit preferably is connected to a load circuit. According to a particularly preferred development of the invention, the storage circuit has a discharge switch means composed with superconducting material and adapted to be brought into a high-resistance, normally conducting state for interrupting the storage circuit and thus discharging the current storage via the load circuit. Switches composed with superconducting material are known per se, just as means for bringing the switch into a high-resistance, normally conducting state for opening the switch, which may be for example a heating means, a means for applying high-energy radiation to the switch (high-frequency radiation, laser radiation, etc.), a means for applying a current pulse of high current intensity to the superconducting material of the switch. The latter is particularly preferred in the current storage according to the invention, in particular in an embodiment in which the current pulse is generated by discharge of a capacitor or several capacitors.
Further preferred features of the invention are indicated in claims 4 to 18 and will be elucidated in more detail further below in conjunction with the description of further preferred embodiments. It is pointed out that the features indicated in t
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Ehrhart Peter
Scholderle Hermann
Weck Werner
Barrera Raymond M.
Magnet-Motor Gesellschaft fur Magnetomotorisch Technik mbH
Thompson Gregory D.
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