Marine propulsion – Electric drive for propelling means
Patent
1991-03-26
1993-10-05
Sotelo, Jesus D.
Marine propulsion
Electric drive for propelling means
60202, B60L 1102
Patent
active
052499901
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a method for the propulsion of water vehicles with which, within a pipe shaped region through which surrounding water is streaming, a magnetic field as well as an electric field are produced with overlapping largely perpendicular field lines in such a way that a force is exercised on the charge carriers located in the surrounding water and this force is utilized as a propulsion force for the water vehicle, whereby, in the pipe shaped region, a radially directed electric field as well as a thereto perpendicularly directed magnetic field are produced.
The invention further concerns an apparatus for the propulsion of water vehicles in which a pipe shaped region through which surrounding water is streaming is equipped with a magnetic coil and in the pipe shaped region two electrodes connected to a voltage source are arranged in such a way that, within the pipe, at least one electrode, surrounded by a magnetic coil and connected to a voltage source, is arranged in such a way that a force is exercised on the charge carriers located in the surrounding water and this force is utilized as a propulsion force for the water vehicle.
A method and an apparatus of the above mentioned kind are known in the art from the British Journal "Maritime Defense, The Journal of International Naval Technology", 12/1988, page 445.
The superposition of an electric as well as a magnetic field upon a medium which contains mobile charge carriers is known in the art of so-called magnetic hydrodynamic propulsion. In consequence of the action of the electric field, the charge carriers begin to move and in consequence of the motion of the charge carriers within the magnetic field the so-called Lorentz force is exercised upon the charge carriers which, as is known in the art, is given by the cross product of the magnetic field and velocity vectors.
As mentioned above, the utilization of this type of magnetic hydrodynamic propulsion with water vehicles is also known in the art. In the above mentioned configuration which is known in the art, the pipe is surrounded by two superconducting saddle coils symmetrically arranged with respect to the pipe axis. The saddle coils produce, in this way, a magnetic field the direction of which runs perpendicular to the pipe axis. In the pipe, two condensor-like plate electrodes are arranged in the axial direction so that the magnetic field produced by these plate electrodes is likewise perpendicular to the axis direction as well as perpendicular to the direction of the magnetic field. This has the consequence that the freely moving charge carriers of the surrounding water located in the pipe, namely the ions of salt water, are given a Lorentz force along the axial direction of the pipe. The configuration which is known in the art produces, in this manner, a recoil force which stems from the axially moving charge carriers within the pipe. In the apparatus which is known in the art for the propulsion of a water vehicle, a magnetic field strength of 2 T is produced with the saddle coils using a current of 2000 A which is intended to lead to a recoil force of 8 kN.
The underlying physical principles necessary to understand this type of magnetic hydrodynamic propulsion are described in a text book of Becker/Sauter "Theorie der Elektrizitat", 19th edition, 1969, Volume 1, pages 255 through 266, as well as in the text book of Pohl "Einfuhrung in die Physik", 20th edition, 1967, Volume 2, "Elektrizitatslehre", pages 98 through 104.
The method and apparatus which are known in the art have the advantage that the propulsion unit does not in any way require moving elements and therefore practically no propulsion noise occurs. For this reason this type of configuration is well suited for military purposes as well, in particular, for the propulsion of submarines.
However, the method and the apparatus known in the art has the associated disadvantage that the operating efficiency is relatively low and the coil construction relatively complicated. Furthermore, the configuration which is known in the ar
REFERENCES:
patent: 3662554 (1972-05-01), de Broqueville
British Journal "Maritime Defense", The Journal of International Navel Technology, Dec. 1988, p. 445.
German text book of Becker/Sauter "Theorie der Elektrizitat" 19th edition, 1969, vol. 1, pp. 255-266.
German text book of Pohl "Einfuhrung in die Physik", 20th edition, 1967, vol. 2, Elektrizitatslehre, pp. 98-104.
Book of Wilson, M. N., "Superconducting Magnets", Clarendon Press, 1983, pp. 53-55.
Contribution from Komarek P. in a conference report "Seminar Supraleitungstechnik", of 13/14 May 1985 in the Schule fur Kerntechnik, Kernforschungszentrum Karlsruhe, pp. 180, 199-209.
British journal "The Motorship", Oct. 88, p. 74.
German text book of Moeller/Fricke/Frohne/Vaske "Grundlagen der Elektrotechnik", B. G. Teubner, Stuttgart 1986, p. 164.
German text book of Linder/Brauer/Lehmann "Taschenbuch der Elektrotechnik und Elektronik", Frankfurt/Main 1985, p. 60.
German journal "Hansa", No. 9/10, 1989, pp. 681-684.
Hamrick Claude A. S.
Sotelo Jesus D.
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