Mitsubishi Denki Kabushiki Kaisha

Norio Oishi

Kouichi Okamoto

Masaki Sakuyama

Masatami Iwamoto

Tatsuei Nomura

Shoji Furukado

Tadatoshi Yamada

Takuya Suganami

Shiro Nakamura

Toshinari Shimazu

Takahiro Masuda

The invention is concerned with the construction of a connection portion between the generator shaft and the exciter shaft of a rotary electric machine of the type having a liquid-cooled rotor such as a turbine generator. Construction of the connection portion consists of; a junction portion between the generator shaft and the exciter shaft, a junction portion between a coolant path in the generator shaft and a coolant path in the exciter shaft, and a connection portion of electric circuits therein, which are located at places deviated in the axial direction, in order to enhance the reliability thereof.

Rotary electric machine of the type having a liquid-cooled rotor

A method of winding and mounting superconductive coils on a cylindrical surface of the coil-carrying shaft of a rotor of a rotary electric machine. A superconductive wire is wound around the circumferential surface of a rectangular bobbin, thereby forming coils. The four straight portions of the circumferential surface are connected with each other by circularly curved surface portions. The portions of the circumferential surfaces corresponding to the axial direction of the coil-carrying shaft have a plurality of steps formed in the direction perpendicular to the axial direction of the coil-carrying shaft. A detachable side plate on the bobbin is then taken off, and the coil is removed from the bobbin. The coils thus formed are mounted on the surface of the coil-carrying shaft, in which a plurality of axially running grooves and a pair of annular recesses running in the circumferential direction of the coil-carrying shaft and connecting the ends of the grooves, the grooves and recesses being pre-formed corresponding to the coils for receiving them therein. A pair of sleeves are fitted over the recesses, thereby securely holding the end portions of the coils in the recesses.

Method of mounting coils on the rotor of a superconductive rotary

The rotor of a superconductive rotary electric machine has a coil-carrying shaft carrying superconductive field coils. A plurality of axially running parallel grooves and a pair of annular circumferentially running indentations, each of which is connected to one end of each of the grooves, are formed on the outer surface of the coil-carrying shaft. The axially and circumferentially running portions of the field coils are accommodated in the grooves and indentations respectively, and the spaces left by the circumferentially running portions of the field coils in the indentations are filled by electrically insulating fillers. Further, a plurality of wedges are fitted into the grooves above the axially running portions of the field coils, while a pair of sleeves are fitted around the coil-carrying shaft over the indentations, each of the sleeves being fitted around the coil-carrying shaft only at one end thereof which is situated farther from the central portion of the coil-carrying shaft than the other end thereof. Rings for preventing the slippage of the sleeves are interposed between the portions of the surfaces of the sleeves and the coil-carrying shaft which are fitted together.

Rotor of a superconductive rotary electric machine

A device for conducting cooling liquid in and out of liquid cooled rotor type machine such as an electric turbine generator. A discharging ring having small holes formed therein is disposed so as to cover an open end of an outflow pipe for cooling liquid from the rotor shaft. A first outlet chamber surrounds the open end of the outflow pipe to receive cooling liquid discharged through the discharging ring. A second outlet chamber having one end side integral with the first outlet chamber receives cooling liquid discharged through a seal between the first outlet chamber and the outflow pipe. Shielding gas is supplied into the first outlet chamber to maintain the pressure therein higher than atmospheric pressure. The first outlet chamber is only partially filled with cooling liquid.

Device for conducting cooling liquid in and out of liquid cooled rotor

Seal-ring type shaft-sealing device

A device for conducting cooling liquid out of a liquid cooled rotor type rotary electric machine in which a sealing means is provided for preventing the leakage of cooling liquid from an outlet chamber adapted to receive the cooling liquid discharged from the rotary electric machine. The sealing means employs a thread seal and a rubber seal in combination. The rubber seal is provided in such a manner as to surround a cooling liquid supplying and draining pipe and so that it is expanded or contracted according to the pressure of gas introduced inside the rubber seal to adjust the gap between the rubber seal and the pipe. The pressure of gas is controlled according to the speed of rotation of the rotor shaft or the amount of liquid leakage.

Growing community of inventors

Kobe, Japan

Norio Oishi