Thruster for submarine vessels
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United States of America Patent
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Feb 17, 2004
Grant Date -
Oct 2, 2003
app pub date -
Mar 29, 2002
filing date -
Mar 29, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A thruster for use in underwater applications, including a stator assembly having an encapsulated set of coils and a rotor assembly having an encapsulated set of permanent magnets. Two ring-shaped rotor bearings, incorporating both thrust bearing surfaces and journal bearing surfaces, are mounted on the rotor assembly, for bearing engagement with corresponding bearing surfaces of ring-shaped bearing assemblies mounted on the stator assembly. The rotor bearings include radial grooves that form a centrifugal pump for drawing sea water through a filter assembly, which then directs the filtered water past the stator coils, for cooling, and past the bearing surfaces, for cooling and lubrication. The stator bearing assemblies are made up of a number of arc-shaped segmental bearings having specially configured cantilevered arms that facilitate the creation of a lubricating film of filtered sea water between the bearing surfaces. The rotor assembly has a shaftless configuration, with a ring-shaped rotor body with a set of inwardly projecting, symmetrically shaped blades.
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