Abstract: Disclosed herein is a superconducting field coil of a homopolar type superconducting synchronous machine. The superconducting synchronous machine includes a superconducting field coil which comprises a single or double pancake coil formed by winding a superconducting wire, a core-type rotor which is made of a magnetic material, and an armature winding excited to three phases on a surface of a core of a stator. The field coil of the homopolar type superconducting synchronous machine is not rotated when the machine is in operation. Thus, there is no part for coupling the rotating field coil to a stationary cryo-cooler for cooling a refrigerant, so that the structure is simple, reliability is high, and various cooling methods are available.

Abstract: An electromechanical power converter that has a rotor assembly with a conductive shell, a first conductor made from superconducting material that is in series electrical contact with the conductive shell and a second conductor made from superconducting material and in series electrical contact with said conductive shell, thus providing an internal impedance converting electromechanical power converter.

Abstract: A superconducting rotating machine includes a stator assembly having at least one stator coil assembly. A rotor assembly, which includes an axial shaft, is configured to rotate within the stator assembly. The rotor assembly includes at least one superconducting winding assembly. A first and second end plate are rigidly attached to the axial shaft at distal ends of the at least one superconducting winding assembly. An asynchronous field filtering shield surrounds the at least one superconducting winding assembly. A first interconnection assembly connects the shield to the first end plate. The first interconnection assembly allows for axial movement between the shield and the first end plate but restricts tangential movement between the same.

Abstract: The superconducting device has a rotor which is rotatable about an axis of rotation and is provided with a superconductive winding in a heat conducting winding carrier. The winding carrier has a central cooling agent cavity with a lateral cavity leading out of the winding carrier connected thereto. A cold head associated with a cooling unit is connected to a condenser unit which condenses the cooling agent. A fixed heat tube guiding the cooling agent is coupled to the condenser unit, protruding axially into the coorotating lateral cavity and is sealed in relation thereto.

Abstract: Disclosed herein is a superconducting rotor with a cooling system located inside. The rotor comprises a superconducting field coil for generating a strong magnetic field, a field coil supporting member for supporting the superconducting field coil, and a pulse tube refrigerator.

Abstract: The superconducting device (2) comprises a rotor (5) which is rotatable about an axis of rotation (A) and is provided with a superconductive winding (10) in a heat conducting winding carrier (9). The winding carrier (9) has a central cooling agent cavity (12) with a lateral cavity (13) leading out of the winding carrier (4) connected thereto. A cold head (16) associated with a cooling unit (16) is connected to a condenser unit (18) which condenses the cooling agent (k, k′). A fixed heat tube (20) guiding the cooling agent (k, k′) is coupled to the condenser unit (18), protruding axially into the co-rotating lateral cavity (13) and is sealed in relation thereto.

Abstract: A system for cooling a superconductor device includes a cryocooler located in a stationary reference frame and a closed circulation system external to the cryocooler. The closed circulation system interfaces the stationary reference frame with a rotating reference frame in which the superconductor device is located. A method of cooling a superconductor device includes locating a cryocooler in a stationary reference frame, and transferring heat from a superconductor device located in a rotating reference frame to the cryocooler through a closed circulation system external to the cryocooler. The closed circulation system interfaces the stationary reference frame with the rotating reference frame.

Abstract: A superconducting device, such as a superconducting rotor for a generator or motor. A vacuum enclosure has an interior wall surrounding a cavity containing a vacuum. A superconductive coil is placed in the cavity. A generally-annularly-arranged, thermally-conductive sheet has an inward-facing surface contacting generally the entire outward-facing surface of the superconductive coil. A generally-annularly-arranged coolant tube contains a cryogenic fluid and contacts a generally-circumferential portion of the outward-facing surface of the sheet. A generally-annularly-arranged, thermally-insulative coil overwrap generally circumferentially surrounds the sheet. The coolant tube and the inward-facing surface of the coil overwrap together contact generally the entire outward-facing surface of the sheet.

Abstract: An isolation system for isolating a first object from vibrations from a second object. Such vibrations will have three orthogonal components, one oriented along a line between the objects, and two oriented 90.degree. apart in a plane normal to that line. The system includes three superconductor/magnet stages, each stage designed to extinguish one of the orthogonal components.

Abstract: A method of designing a superconductivity employing apparatus includes the steps of causing a magnetism generating disk-shaped floatable portion (4) to face a disk-shaped fixed portion (2) capable of exhibiting superconductivity with a gap (G) therebetween; initializing the fixed portion (2) to reach a superconducting state at a position where the floatable portion (4) is spaced away from the fixed portion (2) to such an extent that its magnetic field does not influence the fixed portion (2); and using properly first, second, and n-th approach characteristics (S1, S2, Sn) when a difference between an n-th approach characteristic (Sn) and the second characteristic (S2) is smaller than a difference between the first and second characteristics (S1, S2), where the first approach characteristic (S1) is a characteristic of a magnetic floating force obtained by allowing the floatable portion (4) to approach the fixed portion (2), the second approach characteristic (S2) is a characteristic of a magnetic floating forc

Abstract: A superconducting bearing device includes a permanent magnet on a rotor, with a superconductor placed opposite the magnet. Flux trapped in the superconductor during cooling helps to stabilize the rotor. More specifically, the permanent magnet is mounted on the rotor so that, as the rotor rotates, its rotation does not alter the magnetic flux distribution around the axis of rotation of the rotor. The superconductor permits penetration of the magnetic flux from the magnet, being spaced from the magnet by a distance that permits a predetermined quantity of the magnetic flux to penetrate it, while not permitting rotation of the rotor to alter the distribution of the penetrating magnetic flux.

Abstract: A superconducting device, such as a superconducting rotor for a generator or motor or a superconducting magnet for a magnetic resonance imaging machine, etc. A vacuum enclosure surrounds and is spaced apart from a superconductive coil. Apparatus supports the coil in the enclosure during operation of the device, such apparatus including a first thermally insulative honeycomb assemblage positioned between the coil and the enclosure. In a first preferred construction, the first honeycomb assemblage is positioned between and connected to the coil and a thermal shield, and a second honeycomb assemblage is positioned between and connected to the shield and the enclosure. In a second preferred construction, the second honeycomb assemblage is replaced with a first suspension strap.

Abstract: The superconducting rotor includes at least one field coil made of a superconductor material having a given superconducting transition temperature. A cryocooler system is mounted for rotation with the rotor. The cryocooler includes a cold head portion mounted in heat transfer relation with the field coil to cool the field coil to a temperature below its transition temperature and includes a piston/regenerator adapted to allow passage of a working fluid at a mass flow rate which is substantially uniform over the cross-section of the piston/regenerator during operation of the system. Heat is conducted away from the field coils by heat pipes or by conduction through high thermally conductive material. Mounting the cryocooler cold head for rotation with the rotor eliminates the use of a cryogenic liquid pool for rotor cooling.

Abstract: A superconducting rotating machine comprises a cylindrical frame, a stator installed integrally around an inner periphery of the cylindrical frame and a rotor arranged concentrically and rotatably within the stator in a juxtaposed spaced relationship to the inner surfaces of the stator and with a cylindrical clearance between the inner periphery of the stator and the outer periphery of the rotor. The stator coil includes a primary coil having extra fine Cu filaments and a secondary coil having extra fine filaments made of a superconducting alloy containing Cu, Nb.sub.3 Sn, V.sub.3 Ga, V.sub.3 Ge, Bi, Ca, CuO and Sr. The secondary coil is covered with an insulating layer. Even if a conventional rotatable cryogenic container is not provided, a strong anomalous pseudo-Josephson effect can be obtained. A superconducting generator for use in lighting equipment is also disclosed.

Abstract: A commutator employs superconducting switches to commutate currents in the field stator of a dc machine. The switches couple the machine's stator windings to a DC link. The switches are exposed to magnetic fields of alternating strengths, turning on and off in a sequence that maintains a constant torque angle between the stator's mmf vector and the flux vector of the machine's rotor or that rectifies a current induced into the stator by the machine's rotor.

Abstract: A rotary member is continually held suspended by a strong pinning force of oxide superconductors in a superconductive state. The magnetic field of magnets on the suspended rotary member is distributed concentrically about the center of the pinning force, so that the rotary member can be continually rotated in a non-contacting state while being lifted off the high temperature oxide superconductors. The rotary member is rotated in a high vacuum and is held to continually rotate for an extended period of time. Kinetic energy is stored in and recovered from the rotating member via an input/output device.

Abstract: A dynamoelectric machine having a superconducting magnet rotor and a method of magnetizing the superconducting magnet rotor. The superconducting magnet rotor provides a very strong magnetic field, potentially exceeding the field strength of high energy product permanent magnets.

Abstract: A non-contacting superconducting rotating assembly is described which includes a floating, unsupported and stable rotor. The assembly includes first and second bearings comprised of a material which exhibits Type II superconducting properties. The rotor includes a magnetic pole at each of its extremities, each pole resting in a bearing. The polar axis of each pole is colinear with the rotating axis of the rotor. A temperature bath is provided for maintaining the bearings at or below their critical superconducting temperature and a motive mechanism provides for rotation of the rotor. Each magnet pole is thereby levitated and adapted to rotate in a stable, non contacting position by the field and pinning effects generated by the associated bearing.

Abstract: An AC electrical machine which includes a superconducting, diamagentic flux shield cylinder enclosing the stator windings such that the magnetic flux produced by the machine's rotor is bottled within the flux shield.