An electromagnet can be used to provide a controlled magnetic field, for example for the purpose of minesweeping. The electromagnet is constructed of a material which has a Curie temperature, such that the electromagnet can be stored at a temperature above the Curie temperature, but deployed below the Curie temperature in use.

An electromagnet can be used to provide a controlled magnetic field, for example for the purpose of minesweeping. The electromagnet is constructed of a material which has a Curie temperature, such that the electromagnet can be stored at a temperature above the Curie temperature, but deployed below the Curie temperature in use.

Various embodiments include a magnetic compensation device for a drone for triggering mines comprising: a flux-guiding element comprising a soft magnetic material in the shape of an open or closed ring; a receiving chamber for the drone for holding the drone; and an electric coil device coupled magnetically to the flux-guiding element so a predetermined magnetic flux can be coupled into the flux-guiding element using the coil device. The flux-guiding element and the receiving chamber are arranged in relation to one another so that a magnetic flux brought about by the drone can be closed through the ring shape of the flux-guiding element.

A magnetic anomaly sensing system and method uses two triaxial magnetometer (TM) sensors arranged in a one-dimensional array with the sensors' magnetic sensing axes being parallel to one another. The sensors are spaced-apart from one another along one of the sensing axes by a distance D with a midpoint between the sensors along the one sensing axis being located a distance Z from a reference datum. A processor implements an iterative process to include generating scalar magnitudes of a magnetic anomaly field measured at each of the sensors where the magnetic anomaly field is associated with a magnetic object. A scalar range from the sensors to the magnetic object is generated based on the distance D, the distance Z, and the scalar magnitudes. A magnetic dipole moment of the magnetic object is generated using the scalar range and the scalar magnitudes.

A magnetic anomaly sensing system and method uses two triaxial magnetometer (TM) sensors arranged in a one-dimensional array with the sensors' magnetic sensing axes being parallel to one another. The sensors are spaced-apart from one another along one of the sensing axes by a distance D with a midpoint between the sensors along the one sensing axis being located a distance Z from a reference datum. A processor implements an iterative process to include generating scalar magnitudes of a magnetic anomaly field measured at each of the sensors where the magnetic anomaly field is associated with a magnetic object. A scalar range from the sensors to the magnetic object is generated based on the distance D, the distance Z, and the scalar magnitudes. A magnetic dipole moment of the magnetic object is generated using the scalar range and the scalar magnitudes.

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.

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.

Various embodiments may include a drone for triggering sea mines by means of an external magnetic field. For example a drone may include: a drive having an electric motor; the electric motor comprising a stator and a rotor mounted on a shaft. The stator includes a stator winding arranged on a first carrier. The rotor includes a second carrier and a magnetic or electromagnetic element arranged on the second carrier. The element may be configured to magnetically interact with the stator winding to form a superordinate magnetic field during operation of the electric motor. During operation, the electric motor forms an external magnetic field outside of the electric motor with a magnetic flux density of at least 0.5 mT.

Various embodiments may include a drone for triggering sea mines by means of an external magnetic field. For example a drone may include: a drive having an electric motor; the electric motor comprising a stator and a rotor mounted on a shaft. The stator includes a stator winding arranged on a first carrier. The rotor includes a second carrier and a magnetic or electromagnetic element arranged on the second carrier. The element may be configured to magnetically interact with the stator winding to form a superordinate magnetic field during operation of the electric motor. During operation, the electric motor forms an external magnetic field outside of the electric motor with a magnetic flux density of at least 0.5 mT.

A device for winding and unwinding a cable including a winch comprises a chassis, an electric motor for driving a drum in rotation in relation to the chassis, locking/unlocking means comprising a first induction coil and configured such as to immobilize the drum in relation to the chassis when the first coil is not being powered electrically, the device including a second induction coil that is powered electrically, dimensioned and arranged such that the magnetic field generated by the assembly formed by the first and second coils, when the first coil is powered electrically, is less than the magnetic field generated by the first coil at a point located at a distance from the winch that is greater than a predetermined threshold, the electrical energizing and de-energizing of the second coil being synchronized with the electrical energizing and respectively de-energizing of the first coil.