An energy conversion system includes a low-impedance generator having at least one armature winding set. The armature winding set includes a plurality of single-phase coils. The system also includes a current source converter assembly electrically coupled to an armature of the generator. The current source converter assembly includes at least one current source converter that includes a current source rectifier coupled to a current source inverter via a DC link and at least one capacitor across the plurality of single-phase armature coils. The capacitor(s) of the current source converter(s) is configured to absorb high frequency components of current pulses generated by the current source converter so as to minimize current ripple in a current applied to the plurality of single-phase coils.

A positioning device configured to position an object, the positioning device including: an object table configured to hold the object; an electromagnetic motor configured to displace the object table, the electromagnetic motor including: a coil assembly mounted to the object table, a superconductor assembly configured to co-operate with the coil assembly to generate a driving force on the object table, and a cryogenic enclosure configured to enclose the superconductor assembly and maintain the superconductor assembly in a superconductive state; a support for supporting the electromagnetic motor; and an electromagnetic support configured to suspend the cryogenic enclosure relative to the support, thereby maintaining a gap between the cryogenic enclosure and the support.

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 system for converting potential energy into electric power from a mixture of gases, such as atmospheric air, including a particular lesser-density-gas, such as nitrogen, and a particular larger-density-gas, such as oxygen. The system includes a gas-separator at an upper-elevation; a gas-flow-conduit that has a gas-exit-port at a lesser-elevation, where the lesser-elevation is significantly lower than the upper-elevation; and an energy-converter positioned on the gas-flow-conduit. The gas-separator is coupled to the gas-exit-port via the gas-flow-conduit. The gas-separator separates the particular larger-density-gas from the gas mixture. The gas-flow-conduit conducts the separated particular larger-density-gas from the gas-separator via the gas-flow-conduit to the energy-converter; and the energy-converter generates electric power from the conducted separated particular larger-density-gas.

An energy conversion system includes a low-impedance generator having at least one armature winding set. The armature winding set includes a plurality of single-phase coils. The system also includes a current source converter assembly electrically coupled to an armature of the generator. The current source converter assembly includes at least one current source converter that includes a current source rectifier coupled to a current source inverter via a DC link and at least one capacitor across the plurality of single-phase armature coils. The capacitor(s) of the current source converter(s) is configured to absorb high frequency components of current pulses generated by the current source converter so as to minimize current ripple in a current applied to the plurality of single-phase coils.

An energy conversion system includes a low-impedance generator having at least one armature winding set. The armature winding set includes a plurality of single-phase coils. The system also includes a current source converter assembly electrically coupled to an armature of the generator. The current source converter assembly includes at least one current source converter that includes a current source rectifier coupled to a current source inverter via a DC link and at least one capacitor across the plurality of single-phase armature coils. The capacitor(s) of the current source converter(s) is configured to absorb high frequency components of current pulses generated by the current source converter so as to minimize current ripple in a current applied to the plurality of single-phase coils.

A cooling system for cooling an electric generator having a stator, a rotor and one or more superconducting coils is provided. The cooling system includes: at least a first cooling unit for cooling at least one of the stator and the rotor, at least a second cooling unit for cooling the superconducting coils, the second cooling unit being thermally connected to the first cooling unit, the first cooling unit providing a hot source for the second cooling unit.

A cooling system for cooling an electric generator having a stator, a rotor and one or more superconducting coils is provided. The cooling system includes: at least a first cooling unit for cooling at least one of the stator and the rotor, at least a second cooling unit for cooling the superconducting coils, the second cooling unit being thermally connected to the first cooling unit, the first cooling unit providing a hot source for the second cooling unit.

The invention provides an assembly having a cryostat and a flat coil layer of superconducting coils for use with a magnetic levitation and/or acceleration motor system of a lithographic apparatus. The cryostat has two insulation coverings. The coil layer is arranged between the two coverings. The coverings each have an inner plate configured to be cryocooled and an outer plate parallel to the inner plate, and an insulation system with a vacuum layer between the inner and outer plate. The insulation system of said covering has a layers of circular bodies, the central axes of these bodies extending perpendicular to the inner and outer plate, and is configured to provide a layer of point contacts between two layers of circular bodies or between a layer of circular bodies and the inner and/or outer plate.