Abstract: A watercraft includes at least one high-temperature superconducting coil and a cooling system for cooling the high-temperature superconducting coil to a cryogenic operating temperature, wherein the cooling system has a first cryostat tank, which surrounds the high-temperature superconducting coil and is designed to hold a liquid phase of a cryogenic coolant; wherein the watercraft also has a load, which is designed to convert an operating medium in the form of a fuel and/or in the form of a material promoting combustion; wherein at least one first material component of the operating medium is formed by the cryogenic coolant; and wherein the first cryostat tank is designed to hold a major part of the required total amount of the first material component of the operating medium for the operation of the load. A method operates a watercraft of this type.

Abstract: A method for operating a mine-sweeping system and corresponding mine-sweeping system, wherein the mine-sweeping system includes at least one drone for detonating sea mines. The drone has at least one magnet element for magnetically detonating the sea mines. The method includes a) translationally moving the at least one drone in the water and b) carrying out a first rotational movement of the drone with respect to a first degree of rotational freedom.

Abstract: The present disclosure relates to DC transmission. Some embodiments may include a device for DC transmission comprising: a superconducting transmission line including a superconducting conductor element; and a cooling device for cooling an inner region of the transmission line with a fluid coolant to a temperature below a critical temperature of the superconducting conductor element. The superconducting transmission line may comprise a vacuum-insulated sleeve thermally isolating the inner region of the transmission line from a warmer outer surrounding area. The cooling device may comprise a feed device feeding coolant at an end region of the transmission line into the inner region of the transmission line. The transmission line may be free of internally arranged feed devices for feeding coolant at locations away from the end region.

Abstract: Various embodiments include a rotor for an electric machine comprising: an electric coil arrangement; and a winding carrier mechanically carrying the coil arrangement and at least partially enclosing the coil arrangement on a radially outer side of the coil arrangement. The rotor includes an inner cavity for circulating a fluid coolant such that the coil arrangement comes into contact with the liquid coolant on its radially inner side as the rotor rotates.

Abstract: A rotor for an electrical machine is disclosed herein. The rotor includes a rotor housing, a winding carrier arranged therein, at least one first axial connecting element mechanically interconnecting the winding carrier and the rotor housing, and a superconducting rotor winding configured to produce a magnetic field. The rotor winding is mechanically retained by the winding carrier and is part of a self-contained circuit inside the rotor in which circuit a continuous current may flow. The self-contained circuit has a continuous current switch with a switchable conductor section that may be switched between a superconducting state and a normally conducting state. The switchable conductor section is arranged on the first axial connecting element. A machine including the rotor and a method for operating the rotor is also disclosed herein.

Abstract: An electrical spool device having at least one coil winding composed of a superconducting strip conductor is specified. The strip conductor includes: a strip-type substrate having two main surfaces; at least one planar superconducting layer applied on a first main surface of the substrate; and at least one outer electrical coupling layer applied on at least one of the main surfaces of the conductor composite thus formed. In this case, the coupling layer brings about an electrical coupling of adjacent turns of the coil winding, wherein the electrical coupling is dimensioned such that the time constant for electrical charging and/or discharging of the coil winding is in the range of 0.02 seconds and 2 hours.

Abstract: A rotor for an electrical machine with a central rotor axis, the rotor includes at least one superconducting coil arrangement, a cooling system for cooling the coil arrangement to a cryogenic operating temperature, and a carrying body which mechanically carries at least one coil arrangement from a radially inner side of the coil arrangement. The carrying body has a substantially cylindrical outer contour. The carrying body is predominantly composed of an amagnetic material which has a density of at most 4.6 g/cm3 and a thermal conductivity of at least 10 W/(m-K). The carrying body is designed to thermally couple the superconducting coil arrangement to the cooling system. An electrical machine has a rotor of this kind.

Abstract: The disclosure relates to a system having an electric machine with a superconductive component cooled using a cryogenic liquid, and in particular to the full utilization of the refrigeration power available from vaporization of the cryogenic coolant. The system also has a fuel cell, in which an operating medium may be reacted to provide electrical energy. The coolant is fed in liquid form to the superconductive component to cool the component, utilizing the vaporization enthalpy of the coolant. The coolant is then fed in gaseous form to a further component of the machine to cool the component, utilizing the heating enthalpy of the coolant. The now heated coolant is fed to the fuel cell, which uses the coolant supplied to the fuel cell as an operating medium and reacts it.

Abstract: A saddle coil for a rotor comprising: two poles of an electrical machine having a plurality of coil turns; for each coil turn of the plurality of coil turns, two straight longitudinal sections having a first length and, following on at a right angle from the longitudinal sections, two transverse sections symmetrically curved and with a second length less than the first length. Each longitudinal section and each transverse section includes a coil conductor with a high-temperature superconductor tape. The coil conductors are connected to one another at the corners of the saddle coil by pressing and/or soldering.

Abstract: Various embodiments include a drive system for a vehicle, the system comprising: an internal combustion engine for converting chemical energy stored in a liquid fuel into mechanical energy; a fuel tank for storing fuel for use by the internal combustion engine; and an electric machine having a rotor, a stator, and a cooling system for cooling at least one component of the electric machine using a cooling liquid. The cooling liquid comprises the fuel.

Abstract: The present disclosure relates to cooling devices. The teachings thereof may be embodied in devices for cooling a rotor, which rotates about an axis, wherein the rotor is supported by a central rotor shaft. For example, in a cooling device, the rotor may be supported by a central rotor shaft and comprise a hollow space in the interior of the rotor shaft for accommodating coolant. It may include a first coolant line extending radially outwardly from the hollow space and an annular first distribution line fluidically connected to the hollow space via the first coolant line.

Abstract: Various embodiments include a drive system for a vehicle, the system comprising: an internal combustion engine for converting chemical energy stored in a liquid fuel into mechanical energy; a fuel tank for storing fuel for use by the internal combustion engine; and an electric machine having a rotor, a stator, and a cooling system for cooling at least one component of the electric machine using a cooling liquid. The cooling liquid comprises the fuel.

Abstract: A method for producing an electrical coil device may include winding a strip conductor into a coil winding and subsequently dividing the coil winding into at least two partial coils by at least one cut through the coil winding, wherein the strip conductor remains connected as a doubly contiguous loop by existing remaining connections in the end regions of the strip conductor. An electric coil device is also disclosed, which includes at least two partial coils from a higher-level doubly contiguous strip conductor. The at least two partial coils may be produced by subsequent cutting of a coil winding wound by a single strip conductor.

Abstract: Various embodiments include a rotor for an electric machine comprising: an electric coil arrangement; and a winding carrier mechanically carrying the coil arrangement and at least partially enclosing the coil arrangement on a radially outer side of the coil arrangement. The rotor includes an inner cavity for circulating a fluid coolant such that the coil arrangement comes into contact with the liquid coolant on its radially inner side as the rotor rotates.

Abstract: The disclosure relates to a system having an electric machine with a superconductive component cooled using a cryogenic liquid, and in particular to the full utilization of the refrigeration power available from vaporization of the cryogenic coolant. The system also has a fuel cell, in which an operating medium may be reacted to provide electrical energy. The coolant is fed in liquid form to the superconductive component to cool the component, utilizing the vaporization enthalpy of the coolant. The coolant is then fed in gaseous form to a further component of the machine to cool the component, utilizing the heating enthalpy of the coolant. The now heated coolant is fed to the fuel cell, which uses the coolant supplied to the fuel cell as an operating medium and reacts it.

Abstract: An electric coil apparatus has at least two subcoils from a superordinate doubly connected tape conductor. The coil apparatus has at least two conductor branches, each of the subcoils being wound from one of these conductor branches respectively. The conductor branches of the superordinate tape conductor have a superordinate first surface and a superordinate second surface facing away from this first surface. In a first subcoil, the first surface of the tape conductor faces a centerpoint of the first subcoil, and in a second subcoil, the second surface of the tape conductor faces a centerpoint of the second subcoil. Furthermore, in a manufacturing method of such a coil apparatus the two conductor branches are routed parallel to each other so as to dorm the subcoils.

Abstract: The present disclosure relates to DC transmission. Some embodiments may include a device for DC transmission comprising: a superconducting transmission line including a superconducting conductor element; and a cooling device for cooling an inner region of the transmission line with a fluid coolant to a temperature below a critical temperature of the superconducting conductor element. The superconducting transmission line may comprise a vacuum-insulated sleeve thermally isolating the inner region of the transmission line from a warmer outer surrounding area. The cooling device may comprise a feed device feeding coolant at an end region of the transmission line into the inner region of the transmission line. The transmission line may be free of internally arranged feed devices for feeding coolant at locations away from the end region.

Abstract: The present disclosure relates to cooling devices. The teachings thereof may be embodied in devices for cooling a rotor, which rotates about an axis, wherein the rotor is supported by a central rotor shaft. For example, in a cooling device, the rotor may be supported by a central rotor shaft and comprise a hollow space in the interior of the rotor shaft for accommodating coolant. It may include a first coolant line extending radially outwardly from the hollow space and an annular first distribution line fluidically connected to the hollow space via the first coolant line.

Abstract: A superconducting coil device includes at least one coil winding, including at least one first and one second superconducting strip conductor, the first and second strip conductors each having a superconducting layer and a contact side provided with a contact layer; at least one first contact electrically connecting the contact side of the first strip conductor to an external circuit via a first contact piece; at least one second contact electrically connecting the contact side of the second strip conductor to the external circuit via a second contact piece; and a third contact electrically connecting the first and second strip conductors via the contact layer of the first and the second strip conductor within the coil winding, wherein the contact side of the first strip conductor has a different orientation relative to a center of the coil winding than the contact side of second strip conductor.

Abstract: The present disclosure relates to a cooling systems. The teachings thereof may be embodied in apparati for cooling an energy conversion apparatus having an electric machine comprising a rotor rotating around a central shaft and at least one first turbine arranged on the same shaft. The cooling apparatus may include at least one first internal cavity of the shaft for transporting coolant into a region within the rotor. The first internal cavity may extend axially through the first turbine and through an axial intermediate space between the first turbine and rotor.