Other

Hitachi, Ltd.

Kazuhisa Mori

Takashi Ikimi

Shuji Katoh

Yutaka Sato

Satoshi Fukuda

Takao Kishikawa

Tomoharu Sakoda

Tomoichi Kamo

Katsuzo Aihara

Kouki Yamamoto

Toshiya Doi

Nobuhiro Hara

Toshisuke Mine

Takesi Ozawa

Ikuo Yamato

Asako Koyanagi

Hiromi Inaba

Hirokazu Nagura

Hideki Nihei

Hideki Ayano

An elevator having a power feeding apparatus effective for reducing the installation space for the elevator is disclosed. The dimension of the power transmission part disposed at the hoist way and the dimension of the power receiving part mounted on the counter weight, each measured in the direction along which the counter weight moves are made different from each other.

Power transmission system for elevator

A semiconductor power module capable of efficiently utilizing the performance of the module and facilitating management of the module in custody. The semiconductor power module having one or more semiconductor power switching elements and a drive unit is provided with a non-volatile memory for storing use history of the module and a drive unit. The use history contains information of one of the number of switching times of the semiconductor power switching element, the number of over-current detections of the semiconductor power switching element and a temperature rise of the semiconductor power module.

Semiconductor power module and power converter

Power converter of electric car or hybrid car

A power converter is disclosed, in which the sum of the length of that portion of a control signal line which is in opposite relation to an area of a main circuit wiring where a main circuit current flows and a plurality of tabular conductors are in superposed relation with each other, the length of that portion of the control signal line which is in opposite relation to an area of the main circuit wiring where the main circuit current does not flow and the length of that portion of the control signal line which is located outside an end of the main circuit wiring, is substantially equal to the total wiring length of the signal control line.

Power converter

A semiconductor electric power conversion device includes a converter unit and an inverter unit, each having a group of parallel capacitors and multiple switching elements. Subdivided positive conductive connections associated with the converter unit and divided positive conductive connections associated with the inverter unit are formed at a positive side conductor connected to capacitors; while divided negative conductive connections associated with the converter unit and divided negative-polarity conductive connections associated with the inverter unit are formed at a negative polarity side conductor, connected to capacitors. The positive and negative polarity conductors have a multilayer structure with a dielectric plate interposed therebetween. Converter positive and negative polarity conductors are formed into a multilayer structure with the dielectric plate sandwiched between them, and inverter positive and negative polarity conductors are formed into a multilayer structure with the dielectric plate sandwiched therebetween.

Semiconductor electric power conversion device

Superconducting magnet system using a liquid helium for its operation and a permanent current switch and a system thereof applied to the superconducting magnet system employing a permanent current loop created by a superconducting material developing superconductivity when cooled. The system includes a superconducting magnet dipped in the liquid helium, the permanent current switch for driving or interrupting the superconducting magnet, and a cryostat for accommodating the superconducting magnet and the permanent current switch, and the permanent current switch is arranged over a liquid surface of the liquid helium.

Permanent current switch and superconducting magnet system

Growing community of inventors

Hitachi, Japan

Kazuhisa Mori