Mitsubishi Denki Kabushiki Kaisha

Toshimi Kawamura

Masao Morita

Tadatoshi Yamada

Kiyoshi Hani

Kiyoshi Yoshizaki

Takashi Satow

A superconducting apparatus including a superconducting solenoid coil made of a superconducting wire wound around a bobbin. The superconducting wire has a superconductor having a rectangular cross-section of a narrow width, and the superconductor of the superconducting wire has a larger sectional area at the end region of the superconducting solenoid coil than at the central region. The superconductor at the end region of the superconducting solenoid coil may comprise a plurality of superconducting wires with superconductors having a large sectional area, or may comprise a plurality of superconductors connected in parallel to each other, thereby increasing the effective sectional area of the superconductor in the end region.

Superconducting solenoid coil

A superconducting solenoid designed to improve working efficiency, heat resistance and electrical insulation of the solenoid to a practical extent. The superconducting solenoid comprises a winding frame, wires formed of filamentary conductors having superconductivity and wound around the winding frame, an insulator formed of alumina fiber material and covering each of the wires for providing electrical insulation, and a resinous material impregnated in between turns of the wires so as to provide a supporting structure. The insulator formed of alumina fiber material is in the form of a sheet, a mat or a yarn.

Superconducting solenoid having alumina fiber insulator

A superconducting solenoid and a method of making the same in which the density of the current flowing through the windings can be made a sufficiently high level, and in which the size and the production cost of the solenoid can be reduced as much as possible. The superconducting solenoid comprises: a plurality of coil elements each in the form of a pancake laminated one over another in concentric relation with each other; a plurality of spacers formed of an electrically insulating material and interposed between adjacent coil elements for providing electrical insulation and conduits for a cooling medium; and means for assembling together the laminated coil elements and the spacers. Each of the coil elements includes a winding frame in the form of a cylinder, and filamentary conductors wound around the winding frame and then heat treated, and a supporting structure formed of a resinous material impregnated in between the wound filamentary conductors.

Superconducting solenoid and method of making same

A flywheel energy storage system comprises a dynamoelectric machine, a flywheel connected to the dynamoelectric machine for rotation therewith, an auxiliary machine for performing operational tasks associated with the operation of the dynamoelectric machine and the flywheel, a low voltage power source for operating the auxiliary machine, a permanent magnet generator connected to be operated by energy stored in the flywheel for generating electric power which is supplied to the auxiliary machine when the low-voltage power source is not available, and a converter means connected between the permanent magnet generator and the auxiliary machine for converting a varying voltage from the permanent magnet generator into a stable voltage which can be supplied to the auxiliary machine.

Flywheel energy storage system

The superconducting coil comprises a high magnetic field inner section and a low magnetic field outer section disposed around the inner section. Both the inner and outer sections are forcedly cooled and extend over the entire axial length of the superconducting coil. The inner section for the high magnetic field has a layer-winding structure while the outer section for the low magnetic field has a pancake-winding structure.

Superconducting coil

This invention relates to a power storage system for electric railway which comprises a motor-generator connected to a power system for feeding an electric vehicle with electric power, and a flywheel coupled to the motor-generator, and in which the motor-generator is allowed to store the electric power and thereafter discharge it in correspondence with approach of the electric vehicle to a predetermined running section and running thereof in the section.

Growing community of inventors

Suita, Japan

Toshimi Kawamura