The ring propeller with conical electromagnetic bearings and magneto fluid sealing system

• Autorzy: Matuszewski L.
• Konferencja: Sesja Naukowa Okrętowców European Shipbuilding 2004 Polski przemysł okrętowy (XXI; 27-28.09.2004; Gdańsk, Polska)
• Języki publikacji: EN

Abstrakty

EN

Unique features and operating principles of the method of conversion of electrical energy into mechanical and vice versa are presented herein as applied in the marine vessel propulsion. A marine application has been chosen because of a working prototype for such has been built and is currently tested. It is able to convert the electric power of the prime mover into the rotative power of the propeller, support the propeller, and transmit the thrust developed by the propeller to the vessel's hull. In this new design, an electric variable-frequency-drive synchronous motor mover is integrated with a ring propeller in such a way that the motor's stator in the form of electric windings is built into a nozzle shrouding the propeller, and the motor's rotor in the form of permanent neodymium magnets is built into the propeller's ring. Similar idea had been patented in Ship Research Institute in 1963. The propeller is shaftless, with the ring joining the blades at the tips. The nozzle has radial cavity that accommodates the ring in such a way that the ring inner surface is an extension of the nozzle inner surface, so the nozzle maintains it's optimal geometry. Furthemore, the ring improves the nozzle-propeller hydrodynamic interaction and efficiency by eliminating the leakage losses between moving blades and the nozzle encountered in traditional designs, such as Kort nozzles. Most important innovation is that the propeller is supported by and able to transmit the thrust via two self-centered, self-aligned, tapered magnetic bearings that keep the propeller in state of levitation. Magnetic bearings, as compared with roller and journal bearings, have significantly higher efficiency and require less maintenance. The taper enables transmission of both, radial and thrust loads. The propeller's ring sides perform as the conical bearing's journal (race) surface. The nozzle ring cavity performs as the mating surface and contains two sets of electro-magnets. Magnetic curtain is provided ti seal the bearing from the environment. The curtain is yet another advancement in this design, providing efficiency higher than existing mechanical and labyrinth seals. Magnetorheological fluid is one of the most efficient medium in sealing systems which gives, among all others, relatively lowest torque losses and no leakage at all. Its application has not been tested yet due to preliminary stage of researching work, and is schedule for trials at late autumn of 2004.

• Wydawca: Polish Academy of Sciences - Branch in Gdańsk Marine Technology Committee of the Polish Academy of Sciences
• Czasopismo: Marine Technology Transactions. Technika Morska
• Rocznik: 2004
• Tom: Vol. 15
• Strony: 479--488
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Matuszewski L.

• Gdańsk University of Technology, Faculty of Ocean Engineering and Ship Technology ul. Narutowicza 11/12, 80-952 Gdańsk, Poland

Bibliografia

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• 4. Gosiewski Z.. Falkowski K., Konferencja Automation 2003, Warszawa, marzec 2003, 399—406 (in polish).
• 5. Gosiewski Falkowski K.. Wieleńunkcyine łożyska magnetyczne, Wydawnictwo Naukowe Instytutu Lotnictwa. Warszawa 2003 (in Polish).
• 6. Falkowski K.. Matuszewski L.. Ring Thrusler With Magnetic Bearings, International Conference OCEANS2003. san Diego. USA. 2003.
• 7. Lahteenmmaki J. K., Lantto E. J., Optimization of the conical angle of coneshaped active magnetic hearings, Sixth International Symposium on Magnetic Bearings. 224-233. USA. 1998.
• 8. Koronowicz T., Szantyr J. Bugalski T. Theoretical model for determination the pressure field resulting from hull flow and operation of the marine propeller, Polish Maritime Research Vol. 4 No. 3 (13) September 1997