Shikoku Research Institute Incorporated

Kabushiki Kaisha Shikoku Sogo Kenkyujo

Other

Seiko Epson Corporation

Mitsubishi Denki Kabushiki Kaisha

Shikoku Denryoku Kabushiki Kaisha

Kabushiki Kaisha Shikoku Sogo Kenkyusho

Fuji Electric Co., Ltd.

Nissin Electric Co., Ltd.

Shikoku Electric Power Co., Inc.

Fumihiko Ishikawa

Hiromasa Higasa

Shigenori Matsumura

Kazunobu Sato

Hidetoshi Nasu

Tatsuya Shimoda

Norio Ito

Masayoshi Kumano

Hiroshi Imaizumi

Masanori Yamashita

Toshihisa Shimizu

Sueo Sakata

Makoto Hirose

Takeshi Takemura

Motoaki Shibayama

Takenori Tada

Soichi Yamanaka

Terutsugu Oyama

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 force obtained by allowing the floatable portion (4) to approach the fixed portion (2) after the floatable portion (4) is allowed to recede from the fixed portion (2) to such an extent that its magnetic field does not influence the fixed portion (2), and the n-th approach characteristic is a characteristic of a magnetic floating force obtained by repeatedly carrying out the operations subsequent to the operation of the second approach characteristic (S2).

Method of designing a superconductivity employing apparatus and a

Reverse-charge prevention apparatus

Superconducting bearing

An electric vehicle in which each of the driving wheels is adapted to be driven and regeneratively braked by its individual and independently controlled driving motor, and the driving motors are independently controlled in response to sensors detecting the travel of the vehicle including wheel rotation sensors, steering angle sensors, and acceleration and braking sensors.

Electric vehicle

A superconduction bearing is provided in which the load capacity and rigidity of a rotary member are improved, run-out of the rotary member is prevented to support the rotary member in a stable, non-contacting manner, and manufacturing cost is reduced. The superconduction bearing includes a rotary member and a disk formed on the rotary member. The disk has permanent magnets provided thereon. The permanent magnets are magnetized to have opposite poles on top and bottom sides thereof. A permanent magnet section is thus formed by the disk and the permanent magnets. Superconductors are concentrically provided for rotatably supporting the rotary member. The permanent magnet section and the superconductor section are positioned opposite to each other. The width and thickness of the permanent magnets are set to 5 to 10 times the distance between the permanent magnet section and the superconductor section.

Superconduction bearing

A connection control device for controlling the connection of a small generator unit, which is installed at the consumer's location, to an electric power system. The connection control device detects variations in frequency components which result from interruptions in the distribution of electric power to the consumer from the electric power system. When a significant variation in a frequency component is present, the connection control device disconnects the consumer from the electric power system in order to prevent injury to line workers.

Connection control device for controlling the connection of small

In a power interconnection system between an electric power system and a power converter which makes AC power from a DC power source, a positive feed-back loop is constituted so as to include a frequency deviation detector, a band-pass filter, an inert zone circuit, an amplifier, an adder, a phase controller, an inverter controller, an inverter and an interconnection reactor. Thereby a sufficiently great frequency fluctuation is made after opening of a branch line switch, so as to produce a frequency abnormality signal to be given to a disconnection switch; and disconnection is made certainly.

Interconnection for electric power system

System disconnection detection circuit for a distributed location power

An inverter system is disclosed for inputting an alternating current and a direct current in combination. This inverter system comprises an AC-DC converter to convert a received AC electric power from an AC electric power source to a DC electric power; a DC-AC converter to convert a thus converted DC electric power and a DC electric power from a DC electric power source to an AC electric power; a first switching means to open or close an electric circuit between an output side of the DC-AC converter and a first load; a second switching means to open or close an electric circuit between the AC electric power source to which a second load is connected and the output side of the DC-AC converter; and a controlling means for controlling opening and closing of the first and second switching means. When a electric power consumption of the first load is larger than an output of the DC electric power source, the controller closes the first switching means and opens the second switching means. When an operation of the first load is stopped, the controller opens the first switching means and closes the second switching means. When the electric power consumption of the first load is smaller than the output of the DC electric power source, the controller closes both the first and second switching means.

Inverter system for inputting alternating current and direct current in

Growing community of inventors

Takamatsu, Japan

Fumihiko Ishikawa