Hitachi, Ltd.

Hitachi Mito Engineering Co., Ltd.

Japan Aviation Electronics Industry, Limited

Toshifumi Yoshikawa

Manabu Yazaki

Kohei Sakurai

Hiromi Inaba

Takamichi Hoshino

Kenji Yoneda

Atsuya Fujino

Satoru Toriyabe

Shunichi Tanae

Ryo Okabe

Toru Yamaguchi

Masahiro Watanabe

Masahiko Amano

Sadao Hokari

Kenichi Nakazato

Hironori Ohashi

Minoru Kanoi

Masahiro Matsubara

Shinsuke Inoue

Masaki Sugiura

Toshisuke Mine

Saburo Yasukawa

Hirokazu Nagura

Yuzuru Imamura

Takao Kishikawa

Naoto Ohnuma

Yuri Takano

Shinji Tanifuji

Masaya Furuhashi

Yasuo Satou

Ryou Okabe

Hirokuni Wakui

Hiroki Ookawara

Hironori Fukata

Kazufumi Muraoka

Keiichi Aida

Masaaki Tamada

The number of turns and the winding direction of a cosine-phase coil wound around an i-th tooth and the number of turns and the winding direction of a sine-phase coil wound around the i-th tooth are set according to T=Tcos(m&#x3be;+&#x3b8;)+Tcos(m&#x3be;+&#x3b8;) and T=Tsin(m&#x3be;+&#x3b8;)+Tcos(m&#x3be;+&#x3b8;), respectively, where T: a first reference number of turns of each of the detecting coils of each phase, T: a second reference number of turns of each of the cosine-phase coils, T: a second reference number of turns of each of the sine-phase coils, m: a pole pair number in a magnetic flux distribution formed by the exciting coils, m: a pole pair number in each magnetic flux distribution formed by the detecting coils of each phase, &#x3b8;: the phase of the exciting coils, &#x3b8;: each phase of the cosine-phase coils and the sine-phase coils, and &#x3be;: a mechanical angle of the i-th tooth.

Resolver

The start timing of the pole position inference process of the linear motor installed vertically is delayed by a predetermined time after instruction of brake release. For example, from (1) increasing of the thrust instruction value of an ASR control system up to a predetermined value, (2) the movement (falling) distance of the moving part, or (3) the moving (falling) speed of the moving part, the release condition of the brake is detected and moreover after a predetermined time, the inference process of the pole position is started. The inference process of the pole position of a synchronous motor is fit to the release timing of a brake and a malfunction of the inference process and a runaway (falling in the vertical drive) of a moving part are prevented.

Control apparatus and method for linear synchronous motor

An elevator group control system for controlling multiple elevators cars each of which serves a plurality of floors includes a route preparation section which, at a time of assigning a hall call to one of the elevator cars, calculates a future trajectory for each of the elevator cars. The future trajectory for each elevator is for a case in which the hall call is assigned to the elevator car. A selecting unit which determines a selected one of the elevator cars to which the hall call is to be assigned using the calculated future trajectories.

Elevator group supervisory control system with route preparation section

An elevator group control system includes a reference route generating portion, which for each elevator, generates a reference route which the elevator should follow with respect to the time axis and position axis; and an assignment portion which selects an elevator for assignment to a generated hall call so as to make the actual trajectory of each elevator closer to its reference route. Reference routes which guide the cage's trajectory into temporally equal interval condition are generated, and car assignment is executed to allow the cages to settle in temporally equal interval condition over a long period of time.

Elevator group supervisory control system using target route preparation

A method and a display for elevator allocation evaluating are provided. When an elevator allocated to a hall call is selected by employing two different view points such as a real and a future call evaluation index, an elevator allocation reason and a balance between the two view points can be easily grasped. An elevator allocated to a hall call is evaluated on orthogonal coordinates in which the real call evaluation index and the future call evaluation index are defined as an X and a Y coordinate axis. Evaluation indexes of first to fourth elevator cars are evaluated by employing contour lines of a synthetic evaluation function, which is represented as the real and the future call evaluation index. A weight for allocating is displayed visually.

Method, system, and display for elevator allocation using multi-dimensional coordinates

A power supply system includes a power line for supplying power from a distributed power source to a load upon interruption of electric service from a power system, the load being supplied with power from the power system at normal times; a first switch for connecting the load with the power system at normal times and disconnecting them upon interruption of electric service; and a second switch for connecting the load with the power line upon interruption of electric service and disconnecting them at normal times. Thus, upon interruption of the service, it is possible to use the distributed power source and stably supply power to the load.

Power supply and power supply method upon interruption of electric service

An elevator group control system is provided which stably keeps cage's position in temporally equal interval condition over a long period of time. The present invention provides a system comprising: reference route generating means, which for each elevator, generates a reference route which the elevator should follow with respect to the time axis and position axis; and assignment means which selects an elevator for assignment to a generated hall call so as to make the actual trajectory of each elevator closer to its reference route. Since reference routes which guides the cage's trajectory into temporally equal interval condition are generated and car assignment is executed so as to make the respective cages follow their reference routes, it is possible to allow the cages to settle in temporally equal interval condition over a long period of time.

Elevator group supervisory control system

A driving system for driving an AC motor, which is capable of promptly switching to an individual inverter operation mode, wherein a control instruction for each of a plurality of power converters is generated by summing outputs of a plurality of current compensation units connected in parallel, and each of the plurality of current compensation units makes compensation to reduce a deviation of a detected output current value of an associated power converter from a current instruction value to be outputted from the power converter to zero.

Driving system for driving AC motor

In a control system for a power transmission and distribution system, a plurality of distributed power supplying and receiving units each including a control unit are provided and connected along a power distribution line. The power supplying and receiving unit function to generate active and reactive powers of fundamental and higher harmonic waves to supply and receive the same to and from the power distribution line. A first central control unit controls the power distribution line and is designed to store information relating to the configuration of the power distribution line, to collect information with regard to instant open and close conditions of respective disconnecting switches connected for sectioning the power distribution line, and with regard to current electrical quantities on the power distribution line. Individual control command signals specific to the respective power supplying and receiving units are produced based on the stored and collected information and the respective power supplying and receiving units are controlled so that a desired target condition of the power distribution line is achieved autonomously within the power distribution line through an optimum cooperation control of the units.

Control system for power transmission and distribution system

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Hitachinaka, Japan

Toshifumi Yoshikawa