Pumps – Electrical or getter type – Electromagnetic
Patent
1991-09-10
1994-05-24
Bertsch, Richard A.
Pumps
Electrical or getter type
Electromagnetic
602031, H02K 4408
Patent
active
053143116
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a thrust generator which is suitable for a superconducting Electro Magnetic Thruster (hereinafter referred as EMT) of ship propulsion devices, a Dynamic Positioning Systems for ocean platforms and an Electro-Magnetic pumps acting upon an electrically conductive fluid, for example, sea water and a MHD generator and pumps and generators of pumping-up power systems.
BACKGROUND OF THE INVENTION
It is known to use dipole, quadralpol, saddle and racetrack type superconducting magnets for EMTs. The conventional EMTs may however be too big and too heavy to gain enough thrust for full-scale ships because of a low magnetic field of such magnets and it being difficult to construct the magnets. The magnetic field must be so strong, e.g., 10 to 20 Teslas, to obtain enough propulsive efficiency for EMT ships. The EMT having such a strong magnetic field may be a huge one while an on-board EMT propulsion device is limited in size and weight because of restricted hull space. Now, EMT propulsion units are unsatisfactory with respect to size, weight, thrust force and high magnetic field. In view of this, there is an important technological desire to develop EMTs for practical use.
DISCLOSURE OF INVENTION
The present invention is intended to provide light weight and compact thrust generators having high thrust and high magnetic field superconducting magnets. According to the present invention, the superconducting EMT generator comprises a super conducting solenoid magnet and a helical thrust duct with a pair of electrodes inserted in the hollow interior of the superconducting solenoid magnet. The inlet and the outlet of the spiral duct are spaced axially apart with respect to the longitudinal center axis of the solenoid magnet. In the case of sea water as a conductive fluid flowing in the thrust duct, an anode or a positive electrode is arranged continuously on the inner side wall of the duct, and a cathode or a negative electrode is disposed on the outer side wall of the duct because of a decreasing effective electrochemical reaction area of electrode by producing hydrogen bubbles at the cathode.
It is possible to generate the maximum thrust in case of a ratio of 3.5 of outer radius to inner radius of the duct.
The thrust duct with rectangular cross section is suitable for avoiding waste of the thrust volume.
A pair of superconducting solenoid magnets can be arranged in a row. Also, magnets arranged in parallel can form a closed loop magnetic flux line, resulting in the magnetic flux density generated by a pair of superconducting magnets being so much stronger than a single superconducting magnet.
The higher magnetic flux density generates a higher thrust and a higher propulsive efficiency.
It is possible that the magnetic field can be perfectly shielded by mounting superconducting material films or coils at the end of EMT units.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 shows a simplified cut-away perspective view of a device adopting the present invention.
FIG. 2 shows an enlarged detailed longitudinal section taken through a portion of FIG. 1.
FIG. 3 shows a general layout illustration of the EMT, shown in FIG. 1, for use as a ship propulsion system.
FIG. 4 shows a front view of FIG. 3.
FIG. 5 shows a cross section of a foil as shown in FIG. 4.
FIG. 6 shows a vector schematic of the Lorentz's forces acting on the foil of FIG. 4.
FIG. 7 shows a general layout illustration of EMTs mounted in the hull of a ship.
FIG. 8 shows a front view of FIG. 7.
FIG. 9 shows a plan view of the arrangement of EMTs which provides a closed flux path.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Preferred embodiments of the present invention will now be described hereinafter referring to the accompanying drawings. The thrust generator of the present invention provides a superconducting solenoid magnet 1 and a spiral thrust duct 2. The duct 2 includes inner and outer walls 2a, 2b, interconnected by intermediate walls 2c. The superconducting magnet 1 includes a housing 1A containing coils 3 o
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Basichas Alfred
Bertsch Richard A.
Hiroi Masao
Koatsu Gas Kogyo Co. Ltd.
Muroya Masaaki
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