An electric vessel includes a drive motor to rotate a propeller; a battery module to supply a voltage; an inverter to convert a DC voltage of the battery module into an AC voltage to drive the drive motor; a battery management system (BMS); an electronic control unit (ECU) including a vessel control unit to control the BMS, the inverter, and the drive motor in order to operate the vessel; and an operation unit to transmit an operation signal to the ECU according to a driver's operation.

An electrical power system for a watercraft including a first electrical power plant configured to operate in a variable frequency mode to output variable frequency power to a first electrical network and a fixed frequency mode to output fixed frequency power to a second electrical network. There is a first electrical load including a first high temperature superconductor (HTS) motor connected to the first electrical network and a second electrical load connected to a second electrical network. A controller selectively connects the first electrical power plant to the first electrical network and operates the first electrical power plant in a variable frequency mode to output variable frequency power to power the first HTS motor and selectively connects the first electrical power plant to the second electrical network and operates the first electrical power plant in a fixed frequency mode to output fixed frequency power to power the second electrical load.

An electrical power system for a watercraft including a first electrical power plant configured to operate in a variable frequency mode to output variable frequency power to a first electrical network and a fixed frequency mode to output fixed frequency power to a second electrical network. There is a first electrical load including a first high temperature superconductor (HTS) motor connected to the first electrical network and a second electrical load connected to a second electrical network. A controller selectively connects the first electrical power plant to the first electrical network and operates the first electrical power plant in a variable frequency mode to output variable frequency power to power the first HTS motor and selectively connects the first electrical power plant to the second electrical network and operates the first electrical power plant in a fixed frequency mode to output fixed frequency power to power the second electrical load.

A vessel energy management system for controlling power supply to and from a propulsion system of a vessel. The energy management system has a motor-generator unit adapted to receive power from a prime mover of the vessel, a frequency converter, an energy storage unit, and a controller. According to different embodiments, the energy storage unit includes one or more capacitors, super capacitors or ultra capacitors. The controller determines an instantaneous power requirement of the propulsion system and an average power generated by the prime mover. A comparator compares the instantaneous required power and average power. If the instantaneous required power exceeds the average power, the motor-generator unit receives energy from the energy storage unit. If the instantaneous required power is less than the average power, the motor-generator unit supplies power from the prime mover to the energy storage unit.

An electric underwater jet motor designed for vehicles traveling above or below the sea. The electric underwater jet motor includes a plurality of stators for marine crafts; at least one radial stator, at least one rotor, at least two impeller blades, a magnetic bearing; at least one permanent magnet bar; at least one axial stator, hydrodynamic bearing components, a motor housing and an engine fastener; a hydrodynamic jet motor housing; and a control unit including a microprocessor, a software, magnetic bearing distance sensors, counter and speed measurement sensors, gyroscopic balance sensors to provide comfortable travel by collected data to reduce an effect of sea currents and wave movements which are the consequences of seasickness on the passengers at sea, heat and humidity sensors, pressure measurement sensors, voltage and ampere measurement sensors, a motor drive circuitry, software algorithms, an energy management system, a control panel, batteries and battery charging components.

A high temperature superconductor (HTS) rotating machine having a longitudinal axis and having a first rotational inertia. There is a cylindrical stator assembly disposed about the longitudinal axis and a cylindrical rotor assembly disposed within the stator assembly. The rotor assembly is configured to rotate within the stator assembly about the longitudinal axis. The rotor assembly includes at least one HTS winding assembly which, in operation, generates a magnetic flux linking the stator assembly. There is a cylindrical electromagnetic shield disposed about the at least one HTS winding assembly having a second rotational inertia. There is a cryogenic cooling system for cooling the at least one superconducting winding assembly of the rotor assembly. The second rotational inertia is at least eighty percent (80%) of the first rotational inertia.

An electric underwater jet motor designed for vehicles traveling above or below the sea. The electric underwater jet motor includes a plurality of stators for marine crafts; at least one radial stator, at least one rotor, at least two impeller blades, a magnetic bearing; at least one permanent magnet bar; at least one axial stator, hydrodynamic bearing components, a motor housing and an engine fastener; a hydrodynamic jet motor housing; and a control unit including a microprocessor, a software, magnetic bearing distance sensors, counter and speed measurement sensors, gyroscopic balance sensors to provide comfortable travel by collected data to reduce an effect of sea currents and wave movements which are the consequences of seasickness on the passengers at sea, heat and humidity sensors, pressure measurement sensors, voltage and ampere measurement sensors, a motor drive circuitry, software algorithms, an energy management system, a control panel, batteries and battery charging components.

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 superconducting current limiter with a bifilar coil winding made of a T.sub.c superconductor (HTS) conductor in a cryostat that includes a solid filler material, where the solid filling material is particularly formed from a granulate, hollow bodies or an open-pored structure and is surrounded by cryogen.

A sliding surface located to one side in the axial direction relative to the axially central position of a rotary shaft is supported by the slide surface of a supply shaft in a slidable manner in the axial direction, the slide surface being the surface on which sliding occurs. The portion located to the other side in the axial direction side relative to the axially central position of the rotary shaft is fixed to an output shaft. The sliding surface is positioned on the surface of a hard coating, and the hard coating is positioned so as to cover a part of a substrate made of a GFRP. The slide surface is positioned on the surface of a hard coating, and the hard coating is positioned so as to cover a part of a substrate made of a GFRP.