Boat propulsion system

Abstract

A marine propulsion system may include at least one electric motor and a converter-fed electrical power supply. The at least one electric motor may be arranged in a propeller shaft pipe at a stern of a vessel for driving at least one vessel propeller, and may include at least one drive machine for driving at least one generator.

1 . A marine propulsion system, comprising: 
 at least one electric motor arranged in a propeller shaft pipe at a stern of a vessel for driving at least one vessel propeller;    a converter-fed electrical power supply to supply electric power to the at least one electric motor, including, 
 at least one drive machine for driving at least one generator, wherein 
 at least one of the at least one electric motor and the at least one generator is a three-phase synchronous machine, and  
 at least one of the at least one electric motor and the at least one generator includes a rotating field winding composed of high-temperature superconductor (HTSL) wire, each rotating field winding being arranged in a cryostat for cryogenically cooling the rotating field winding to a temperature between 15 and 77 K.  
 
   
   
   
       2 . The marine propulsion system as claimed in  claim 1 , wherein at least one of the at least one electric motor and the at least one generator includes an air gap three-phase winding composed of loomed copper conductors, arranged in an annular gap between a rotor and a laminated magnetic iron yoke.  
   
   
       3 . The marine propulsion system as claimed in  claim 1 , wherein the HTSL wire of the rotating field winding is formed from multifilament ribbon conductors Bi 2  Ba 2  Sr 2  Cu 3  O x  or B 2  Ba 2  SrCu 2  Ox in at least one of a 
 silver and silver-alloy matrix, of YBa 2  Cu 3  O x  as a thin film on a steel strip, a nickel strip, a strip composed of an alloy containing nickel, a silver strip or an MgB 2  superconductor.    
   
   
       4 . The marine propulsion system as claimed in  claim 2 , wherein the rotor, including the rotating field winding composed of HTSL wire, includes 6 to 12 poles.  
   
   
       5 . The marine propulsion system as claimed in  claim 1 , wherein each cryostat is suppliable with coolant via a coolant circuit.  
   
   
       6 . The marine propulsion system as claimed in  claim 1 , wherein cryostats are suppliable with coolant via at least two redundant coolant circuits.  
   
   
       7 . The marine propulsion system as claimed in  claim 5 , wherein at least one of cold helium and hydrogen gas is provided as the coolant in the coolant circuit between a cold head and a transfer coupling to the cryostat.  
   
   
       8 . The marine propulsion system as claimed in  claim 5 , wherein the coolant circuit between a cold head and a transfer coupling to the cryostat is designed such that the transfer coupling is supplied with a liquid coolant including at least one of liquid neon, liquid hydrogen, liquid nitrogen and a liquefied gas mixture, and vaporized coolant is fed back to the cold head.  
   
   
       9 . The marine propulsion system as claimed in  claim 7 , wherein the cold head of each coolant circuit is operatable via a closed-cycle compressed-gas circuit.  
   
   
       10 . The marine propulsion system as claimed in  claim 9 , wherein the compressed-gas circuit for the cold head is cooled by at least one of a central cooling water supply, sea water, and a heat exchanging device connected to outer surfaces of the vessel over which sea water washes.  
   
   
       11 . The marine propulsion system as claimed in  claim 7 , wherein each cold head is associated with a respective compressed-gas circuit.  
   
   
       12 . The marine propulsion system as claimed in  claim 9 , wherein each compressed-gas circuit includes an associated integrated sea-water cooling circuit.  
   
   
       13 . The marine propulsion system as claimed in  claim 9 , wherein each compressed-gas circuit includes an associated integrated fresh-water circuit, with a heat exchanger to transfer heat from the compressed-gas circuit to the integrated fresh-water circuit.  
   
   
       14 . The marine propulsion system as claimed in  claim 13 , wherein the integrated fresh-water circuit includes another heat exchanger to thermally connect the integrated fresh-water circuit to sea water.  
   
   
       15 . The marine propulsion system as claimed in  claim 1 , wherein the electrical power supply includes a power machine and a generator having a cryostat, including a rotating field winding and is suppliable with coolant by a coolant circuit shared by the cryostat of the electric motor and the cryostat of the electrical power supply.  
   
   
       16 . The marine propulsion system as claimed in  claim 1 , wherein the electrical power supply includes a power machine and a generator having a cryostat, including a rotating field winding and is suppliable with coolant by two coolant circuits, which are mutually redundant and are shared by cryostat of the electric motor and the cryostat of the electrical power supply.  
   
   
       17 . The marine propulsion system as claimed in  claim 7 , wherein the cold head in each coolant circuit is arranged in the vertical direction above that cryostat which is arranged at the highest point in the vertical direction.  
   
   
       18 . The marine propulsion system as claimed in  claim 2 , wherein the rotor, including the rotating field winding composed of HTSL wire, includes 8 poles.  
   
   
       19 . The marine propulsion system as claimed in  claim 6 , wherein at least one of cold helium and hydrogen gas is provided as the coolant in the coolant circuit between a cold head and a transfer coupling.  
   
   
       20 . The marine propulsion system as claimed in  claim 5 , wherein the coolant circuit between a cold head and a transfer coupling to the cryostat is designed such that the transfer coupling is supplied with a liquid coolant including at least one of liquid neon, liquid hydrogen, liquid nitrogen and a liquefied gas mixture, and vaporized coolant is fed back to the cold head.  
   
   
       21 . The marine propulsion system as claimed in  claim 8 , wherein the cold head of each coolant circuit is operable via a closed-cycle compressed-gas circuit.  
   
   
       22 . A marine propulsion system, comprising: 
 at least one electric motor, arranged as an in-board motor, and for driving at least one vessel propeller associated therewith via a drive shaft system; and    a converter-fed electrical power supply to supply electric power to the at least one electric motor; the converter-fed electrical power supply including, 
 at least one drive machine for driving at least one generator, wherein 
 at least one of the at least one electric motor and the at least one generator is a three-phase synchronous machine, and  
 at least one of the at least one electric motor and the at least one generator includes a rotating field winding composed of high-temperature superconductor (HTSL) wire, each rotating field winding being arranged in a cryostat for cryogenically cooling the rotating field winding to a temperature between 15 and 77 K.  
 
   
   
   
       23 . The marine propulsion system as claimed in  claim 22 , wherein at least one of the at least one electric motor and the at least one generator includes an air gap three-phase winding composed of loomed copper conductors, arranged in an annular gap between a rotor and a laminated magnetic iron yoke.  
   
   
       24 . The marine propulsion system as claimed in  claim 22 , wherein the HTSL wire of the rotating field winding is formed from multifilament ribbon conductors Bi 2  Ba 2  Sr 2  Cu 3  O x  or B 2  Ba 2  SrCu 2  O x  in at least one of a 
 silver and silver-alloy matrix, of YBa 2  Cu 3  Ox as a thin film on a steel strip, a nickel strip, a strip composed of an alloy containing nickel, a silver strip or an MgB 2  superconductor.    
   
   
       25 . The marine propulsion system as claimed in  claim 23 , wherein the rotor, including the rotating field winding composed of HTSL wire, includes 6 to 12 poles.  
   
   
       26 . The marine propulsion system as claimed in  claim 22 , wherein each cryostat is suppliable with coolant via a coolant circuit.  
   
   
       27 . The marine propulsion system as claimed in  claim 22 , wherein cryostats are suppliable with coolant via at least two redundant coolant circuits.  
   
   
       28 . The marine propulsion system as claimed in  claim 26 , wherein at least one of cold helium and hydrogen gas is provided as the coolant in the coolant circuit between a cold head and a transfer coupling to the cryostat.  
   
   
       29 . The marine propulsion system as claimed in  claim 26 , wherein the coolant circuit between a cold head and a transfer coupling to the cryostat is designed such that the transfer coupling is supplied with a liquid coolant including at least one of liquid neon, liquid hydrogen, liquid nitrogen and a liquefied gas mixture, and vaporized coolant is fed back to the cold head.  
   
   
       30 . The marine propulsion system as claimed in  claim 28 , wherein the cold head of each coolant circuit is operatable via a closed-cycle compressed-gas circuit.  
   
   
       31 . The marine propulsion system as claimed in  claim 30 , wherein the compressed-gas circuit for the cold head is cooled by at least one of a central cooling water supply, sea water, and a heat exchanging device connected to outer surfaces of the vessel over which sea water washes.  
   
   
       32 . The marine propulsion system as claimed in  claim 28 , wherein each cold head is associated with a respective compressed-gas circuit.  
   
   
       33 . The marine propulsion system as claimed in  claim 30 , wherein each compressed-gas circuit includes an associated integrated sea-water cooling circuit.  
   
   
       34 . The marine propulsion system as claimed in  claim 30 , wherein each compressed-gas circuit includes an associated integrated fresh-water circuit, with a heat exchanger to transfer heat from the compressed-gas circuit to the integrated fresh-water circuit.  
   
   
       35 . The marine propulsion system as claimed in  claim 34 , wherein the integrated fresh-water circuit includes another heat exchanger to thermally connect the integrated fresh-water circuit to sea water.  
   
   
       36 . The marine propulsion system as claimed in  claim 22 , wherein the electrical power supply includes a power machine and a generator having a cryostat, including a rotating field winding and is suppliable with coolant by a coolant circuit shared by the cryostat of the electric motor and the cryostat of the electrical power supply.  
   
   
       37 . The marine propulsion system as claimed in  claim 22 , wherein the electrical power supply includes a power machine and a generator having a cryostat, including a rotating field winding and is suppliable with coolant by two coolant circuits, which are mutually redundant and are shared by cryostat of the electric motor and the cryostat of the electrical power supply.  
   
   
       38 . The marine propulsion system as claimed in  claim 28 , wherein the cold head in each coolant circuit is arranged in the vertical direction above that cryostat which is arranged at the highest point in the vertical direction.  
   
   
       39 . The marine propulsion system as claimed in  claim 23 , wherein the rotor, including the rotating field winding composed of HTSL wire, includes 8 poles.  
   
   
       40 . The marine propulsion system as claimed in  claim 27 , wherein at least one of cold helium and hydrogen gas is provided as the coolant in the coolant circuit between a cold head and a transfer coupling.  
   
   
       41 . The marine propulsion system as claimed in  claim 26 , wherein the coolant circuit between a cold head and a transfer coupling to the cryostat is designed such that the transfer coupling is supplied with a liquid coolant including at least one of liquid neon, liquid hydrogen, liquid nitrogen and a liquefied gas mixture, and vaporized coolant is fed back to the cold head.  
   
   
       42 . The marine propulsion system as claimed in  claim 29 , wherein the cold head of each coolant circuit is operable via a closed-cycle compressed-gas circuit.