Patent
AC Elevator control system
Masami Nomura
- 20 Apr 1983
67
TL;DR: In this paper, an AC elevator control system has a converter for converting a three-phase AC power to a direct current, an inverter for inverting the direct current to a three phase AC power with a variable voltage at a variable frequency, and a threephase induction motor for receiving the last-mentioned AC power.
read more
Abstract: An AC elevator control system has a converter for converting a three-phase AC power to a direct current, an inverter for inverting the direct current to a three-phase AC power with a variable voltage at a variable frequency, and a three-phase induction motor for receiving the last-mentioned AC power to operate an elevator car connected to a counterweight through a traction rope trained over a sheave. A battery connected across the DC side of the inverter is enabled upon the occurrence of a power failure or a fault. A command emergency frequency generator responds to the occurrence of an emergency such as a power failure to deliver to the inverter a low frequency emergency frequency as determined by the relationship between a difference in weight between the elevator car and the counterweight and various losses of a motor driving system so as to cause the induction motor not to generate regenerative power.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Patent
Elevator control device
Hiroaki Matsuoka,Kazuhiko Takasaki,寛晃 松岡,一彦 高崎 +3 more
- 12 May 2004
TL;DR: In this paper, the first and second power converters supplying electrical power to a multi-winding motor comprising a wind-up mechanism are switched off, and a third contactor comprising a short-circuiting unit is switched on.
173
Patent
Apparatus and method for controlling operation of elevator in power failure
Yeo Hwan Jae
- 08 Dec 1999
TL;DR: In this article, an apparatus for controlling an operation of an elevator includes a power supply unit for detecting whether the main power supply was supplied including a charger and for outputting a predetermined control signal, an operation control unit for receiving the control signal from the direct current power supply units and a demand control signal inputted by a user, and a speed controller unit for controlling a rotational speed of the alternating current motor upon receipt of the load compensation signal and the control signals from the speed limiter.
90
Patent
System for precharging a dc link in a variable speed drive
Harold R. Schnetzka
- 09 Feb 2006
TL;DR: In this article, a variable speed drive (104) with a converter (202) that is controllable to precharge a DC link (204) is provided, where the converter converts a fixed line frequency, fixed line voltage AC power from an AC power source (102) into DC power.
69
Patent
Device for driving elevator at service interruption
Hiroshi Araki
- 10 Jun 1992
TL;DR: In this article, a device for driving an elevator at the time of a service interruption according to the present invention has a circuit for varying d-axis magnetic flux command to prevent regeneative power that can damage the elements in an inverter from being generated at time of an interruption eliminating the need for a regenerative power consumption circuit.
60
Patent
Elevator power source device
Masao Iwasa
- 14 Aug 1990
TL;DR: A simplified elevator power system using an AC-DC converter, both to convert AC to DC during normal operation and to convert stored DC power to AC during power failures is presented in this paper.
48
References
Patent
Controller for elevator
Hiromi Inaba,Seiya Shima,Takeki Ando,Toshiaki Kurosawa,Yasunori Katayama,Takanobu Hatakeyama,Sadao Hokari +6 more
- 02 Sep 1982
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.
132
Patent
Operation control apparatus for AC motors
Shigeki Kawada,Hiroshi Ishida +1 more
- 11 Aug 1980
TL;DR: In this paper, an apparatus for controlling the operation of an AC motor wherein braking energy at the time of a reduction in motor speed is disposed of by regenerative braking is presented.
47
Patent
AC Elevator control system
Nobuo Mitsui,Yasuyuki Maeda,Tomiaki Kurihara,Seiya Shima,Takanobu Hatakeyama,Katsu Komuro +5 more
- 06 May 1980
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.
28
Patent
Elevator control system
Donald E Grove,Administratrix By Betty Grove +1 more
- 23 Jan 1974
TL;DR: In this paper, an emergency control system is provided for an elevator installation which responds automatically to a power failure, low voltage condition, loss of phase, or the like, to move the elevator to a reference floor, and then to open the elevator doors and hold them open to permit passengers to leave the elevator.
26
Patent
Emergency apparatus for elevator
Hideo Uchino,Nomura Masami,Aoi Takaaki,Kanbe Masumi +3 more
- 21 Jan 1981
TL;DR: An emergency apparatus for elevator which converts a DC power into an AC power by an inverter device in an emergency state to feed the AC power to an AC traction motor and an AC motor for door-opening and closing which have different rated voltages so as to drive a cage of the elevator and to open and close a door of the cage as discussed by the authors.
25
Related Papers (5)
Eiki Watanabe
- 03 Jul 1984
[...]
Seppo Suur-Askola,Timo Lehtonen,Ralf Ekholm +2 more
- 22 Nov 1995
Hiroshi Araki
- 10 Jun 1992
Hiroshi Kamaike
- 26 Apr 1984