S
Seiya Shima
Researcher at Hitachi
Publications - 32
Citations - 485
Seiya Shima is an academic researcher from Hitachi. The author has contributed to research in topics: Elevator & Signal. The author has an hindex of 12, co-authored 32 publications receiving 485 citations.
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Patent
Controller for elevator
Hiromi Inaba,Seiya Shima,Takeki Ando,Toshiaki Kurosawa,Yasunori Katayama,Takanobu Hatakeyama,Sadao Hokari +6 more
TL;DR: In this paper, an elevator controller uses an acceleration command signal that has as its initial value a start shock compensation torque which will offset the unbalance torque caused at the time of starting.
Patent
AC Elevator control system
TL;DR: In this article, a control system for an AC elevator system in which an actual speed of an elevator car is compared with a speed command and control is made so that deviation between the actual speed and the commanded speed becomes zero.
Patent
PWM control for power converter system utilizing pulse dropping at minimum pulse widths
TL;DR: In this article, a pulse generator for supplying a pulse pattern to semiconductor devices of a power converter (such as an inverter or a converter) using the pulse width control scheme is provided with function of dropping pulses so that the pulse pattern may form a predetermined function provided that the pulses width is shorter than a limit value (Limit).
Patent
Apparatus for compensating reactive power by current-source type converter
TL;DR: In this paper, the instantaneous reactive currents of a three-phase load were determined on the basis of the sum signal and the three phase sinusoidal wave signals of three phases, each of which has a phase difference of 90° relative to the corresponding phase voltage.
Patent
Current-source power converting apparatus with self-extinction devices
TL;DR: In this paper, a three phase AC-DC converter composed of self-extinction devices for converting an AC power furnished from an three-phase AC power source into a DC power and a DC-AC inverter connected with the ACDC converter through a DC reactor for re-converting the DC power into a 3 phase AC power to supply the reconverted power for a load.