EP0471348A1 - Vorrichtung zur Ermittlung der Position einer Aufzug-Fahrkabine - Google Patents

Vorrichtung zur Ermittlung der Position einer Aufzug-Fahrkabine Download PDF

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Publication number
EP0471348A1
EP0471348A1 EP91113594A EP91113594A EP0471348A1 EP 0471348 A1 EP0471348 A1 EP 0471348A1 EP 91113594 A EP91113594 A EP 91113594A EP 91113594 A EP91113594 A EP 91113594A EP 0471348 A1 EP0471348 A1 EP 0471348A1
Authority
EP
European Patent Office
Prior art keywords
car
source
car position
detecting device
capacitor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91113594A
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English (en)
French (fr)
Inventor
Doi Kazuhiko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Otis Elevator Co
Original Assignee
Otis Elevator Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Otis Elevator Co filed Critical Otis Elevator Co
Publication of EP0471348A1 publication Critical patent/EP0471348A1/de
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
    • B66B1/3492—Position or motion detectors or driving means for the detector
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions

Definitions

  • This invention relates to an elevator position-detecting device. More particularly, this invention relates to an elevator car position-detecting device which can detect the position of a car accurately when power failure has cut off the supply of electric power to the driving device of the elevator to stop the car in an emergency situation, so that elevator operation can be smoothly started again after the supply of power has been restored.
  • the car position of an elevator may be constantly monitored by a car position-detecting device.
  • An elevator-controlling device controls the acceleration speed, deceleration speed, and running direction of the car, based on a call for the car that assigns the preceding floor being input through the control panel in the car, hall call being input through the control panel at each floor, and said car position detection signal.
  • the controlling device cannot easily make a highly accurate control of the run.
  • the elevator generally a motor is used as the driving device to drive the car, and normally power is supplied to drive this driving device.
  • the ordinary elevator is configured for operation so that the car can make an emergency stop or can be run by auxiliary power from a nearby floor when the power supply has been cut off, such as by power failure, to ensure the safety of the passengers.
  • the car position-detecting device detects the car position after receiving the power supply from a common source which supplies power to the driving device, cutting off the power supply will stop the car position-detecting function.
  • the car position-detecting device will remain inoperable after initiation of the emergency stop motion or during the run to the nearest floor during power failure, a situation is created whereby information about the position of the car relative to the controlling device cannot be obtained.
  • an object of this invention is to provide a car position-detecting device which can accurately detect the stopping position of the car by keeping the car position-detecting function of the car position-detecting device in operating status even after normal cut-off of the power supply.
  • Another object of this invention is to provide a device which can maintain the car position-detecting function after stopping the power supply, without providing a special auxiliary power device, by using the capacitor provided in the drive circuit for absorption of the recovery energy during the operation of the driving device, such as an induction motor and so on, in recovery mode, as the supplementary power source of the car position-detecting device.
  • a car position-detecting device for an elevator is provided with the elevator capable of being operated between several floors by a drive motor powered by a source of drive power also used by the position detecting device for detecting the position of the car under normal conditions.
  • the position detecting device provides a car position signal to an elevator controller which operates the car between various landings selected in response to car calls and hall calls with the controller controlling the positioning of the car with respect to the landings with reference to the car position signal, as characterized by connecting the car position-detecting device to the source of drive power and also, for use as a power source during a power interruption or recovery mode operation, connecting it to a recovery energy-storage device such as a capacitor connected to the source of power or a power source derived therefrom, thereby powering the car position-detecting device by means of a discharge of the capacitor if the normal source is interrupted.
  • a recovery energy-storage device such as a capacitor connected to the source of power or a power source derived therefrom
  • a car position-detecting device of an elevator apparatus detects the position of the car being operated between several floors continuously by the driving device driven by a source of drive power, feeds the car position detection signal to the control device, operates the car to a destined service floor determined in response to the car position detection signal, car call and hall call, and performs an emergency stop to the operation of the car when the source of power to the source of drive power has been cut off, as characterized by connecting the car position-detecting device that detects the position of the car and generates the car position detection signal to the source of drive power and also connecting it to the recovery energy-absorbing capacitor of the driving device during the recovery mode operation, setting the discharge time of the capacitor longer than the inertial running time at the time of the emergency stop of the car, disposing power switching between the capacitor and the car position-detecting device and the source of drive power, switching the connection of the source of power switching to the capacitor from the source of drive power when the source of drive power has been cut off, and driving the car position-detecting device by means of
  • the driving device may be made from a driving circuit comprising a motor and an inverter circuit.
  • the capacitor is preferably set in the inverter circuit.
  • the discharge time constant of the capacitor should be set for a longer time than the inertial running time during the emergency stop of the car.
  • the car of the elevator is run between several floors.
  • the driving device which drives the car to ascend or descend is made of a motor such as an induction motor and is driven by an electrical drive power source, such as a commercial power supply.
  • the running position of the car is detected by the car position-detecting device which is normally made of an encoder or the like, and the car position detection signal mainly controls the power supply to the driving device to feed the controlling device and controls the operation of the car.
  • the control device controls the driving device in such a way as to operate the car to reach a selected service floor determined in response to the car position detection signal, car call, and hall call.
  • the car position-detecting device is connected to the source of drive power and also to the recovery energy-absorbing capacitor of the driving device in recovery mode operation.
  • a power switching means may be provided between the source of drive power and the capacitor and the car position-detecting device to switch the connection of the source of power switching from the source of drive power to the capacitor when the source of drive power has been cut off, for maintaining the operating status of the car position-detecting device for a certain length of time by the discharge output of the capacitor, so as to detect the stop position of the car accurately.
  • the car stop position can be detected accurately by selecting the discharge time of the capacitor in proportion to the inertial running time of the car at emergency stop when the power supply to the source of drive power has been cut off.
  • Fig. 1 illustrates an elevator system that contains an elevator car position-detecting device according to this invention.
  • the driving device which drives and raises and lowers the car (not illustrated) via a suspension cable is driven by an AC induction motor (10).
  • This motor (10) is connected to a drive circuit (16) which includes a rectifier (14) connected to an inverter circuit (12) and a three-phase AC power source (17a, 17b, 17c).
  • Torque command signals and speed commands from a control circuit 18 to drive circuit (16) by any commonly known means.
  • the drive circuit (16) controls the AC current level to be fed to the motor, based on these signals, to achieve a desired acceleration or deceleration speed for the car.
  • a capacitor (20) to absorb energy to be used when the motor (10) is operated in recovery mode is mounted in this drive circuit (16) parallel to the inverter circuit (12).
  • both terminals of the capacitor (20) are connected, respectively, to the feeding wires (22a) and (22b) through the connecting points (24a) and (24b).
  • a DC-DC converter (26) is further connected to these connecting points (24a) and (24b).
  • the DC-DC converter generates a DC current of a specific voltage level from the DC current which is fed from the rectifier (14) through the feeding wires (22a) and (22b). This DC current of a specific voltage level is fed as an operating current to a car position-detecting device (30).
  • a pulse signal generator (28) to generate a pulse signal TG at a frequency synchronized to the rotation of the motor is mounted on the motor (10).
  • the generator (28) is a speed sensor.
  • the pulse signal generator (28) is connected to the car position-detecting device (30) of this example of the invention and feeds the pulse signal (TG) to the car position-detecting device (30).
  • a known floor detecting device (34) detects its position as the car approaches each floor and generates a floor detection signal (FL) connected to the car position-detecting device (30).
  • a switch (32) made of a relay switch is connected to the car position-detecting device (30), and two switching terminals (32a) and (32b) of this switch (32) are connected, respectively, to the secondary coil of the converter (38a), feeding wire (22b), and the connecting point (24b) of the capacitor (20).
  • the switch (32) responds to a detecting means (not shown) which functions to detect the power supply status.
  • a detecting means not shown
  • the switch When the power supply is in a state of normal operation, it causes the switch to connect the secondary coil of the converter (38a) to the car position-detecting device (30).
  • the connecting point (24b) When the power supply has been cut off, it connects the connecting point (24b) to the car position-detecting device (30).
  • the car position-detecting device (30) detects the status of the power supply by the change of the input level caused by the switching of the switch (32) to perform a position-detecting operation.
  • the car position-detecting device (30) detects the position of the car and feeds the car position detection signal CP to the control circuit (18), based on the pulse signal TG being supplied from the pulse signal generator (28) and the floor detection signal FL, which has been supplied from the floor-detecting device (34).
  • the car position-detecting device (30) detects the change of input level from the switch (32) when the power supply has been cut off and starts the operation of the emergency stop mode. In this case, the output from the rectifier (14) is at zero level as the power supply was cut off.
  • the capacitor (20) Since the capacitor (20) starts its electrical discharge as a result, the discharge output from the capacitor will maintain the level of operating current for a specific length of time, based on the DC-DC converter relative to the car position-detecting device. During this period, the car position-detecting device (30) continues to count the pulse signals supplied from the pulse signal generator (28) and generates the car position data. This car position data is stored in the car position-detecting device (30) and is written sequentially in a memory device (36) which is internally connected. Incidentally, the memory device (36) is composed of a nonvolatile memory device to hold the car position data even after completion of the discharge from the capacitor (20).
  • Fig. 2(a) illustrates a waveform 40 of a commercial three-phase AC power source which is fed on the lines (17a, 17b, 17c) to the rectifier (14) of the drive circuit (16) to serve as the source of drive power.
  • power stoppage has occurred at time ti.
  • Figure 2(c) which shows in a plot of speed or travel distance, as power failure occurred, the elevator starts its operation in emergency stop mode. After the emergency stop mode operation started at time t i , the car proceeds by inertial force, the speed reaches zero, and the car is stopped at time t 2 . During this period, the capacitor (20) continued to discharge, as illustrated by a waveform 44 in Fig.
  • the car position-detecting device (30) detects the power supply cut-off (power failure) by the change of the input level from the switch (32) at time ti and switches the operating mode from a normal mode to an emergency stop mode.
  • the inertial running distance of the car from time t i to time t 2 is detected by the count of the pulse signal TG, and the car position at time t 2 will be stored as the car position data DP in the memory device (36).
  • the length of discharge time of the capacitor (20) may be selected to ensure sufficient energy is stored to sustain the memory storage function, considering the longest, i.e., worst case inertial running distance or time of the car, e.g., full load.
  • control circuit (18) reads out the car position data DP stored in the memory device (36) and the control is restarted with the position shown in this car position data as the current car position. Therefore, it is no longer necessary to reset the car position after restoring the power supply, and thus the restart of elevator operation after restoration of the power supply can be done quickly.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Elevator Control (AREA)
  • Indicating And Signalling Devices For Elevators (AREA)
EP91113594A 1990-08-14 1991-08-13 Vorrichtung zur Ermittlung der Position einer Aufzug-Fahrkabine Withdrawn EP0471348A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP214703/90 1990-08-14
JP2214703A JPH04101978A (ja) 1990-08-14 1990-08-14 エレベーターのかご位置検出装置

Publications (1)

Publication Number Publication Date
EP0471348A1 true EP0471348A1 (de) 1992-02-19

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EP91113594A Withdrawn EP0471348A1 (de) 1990-08-14 1991-08-13 Vorrichtung zur Ermittlung der Position einer Aufzug-Fahrkabine

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EP (1) EP0471348A1 (de)
JP (1) JPH04101978A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010079258A1 (en) * 2009-01-12 2010-07-15 Kone Corporation Transportation system
ES2394334A1 (es) * 2012-07-06 2013-01-30 Coapsa Control, S.L. Dispositivo de emergencia para descenso seguro de cargas
WO2023284291A1 (zh) * 2021-07-14 2023-01-19 日立楼宇技术（广州）有限公司 电梯停电应急设备、方法、装置及电梯

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4124103A (en) * 1977-03-09 1978-11-07 Westinghouse Electric Corp. Elevator system
US4142609A (en) * 1976-12-13 1979-03-06 Mitsubishi Denki Kabushiki Kaisha Elevator control system
GB2063522A (en) * 1979-11-22 1981-06-03 Hitachi Ltd Apparatus for determining elevator car position
GB2111251A (en) * 1981-11-16 1983-06-29 Mitsubishi Electric Corp Apparatus for operating an ac powered lift
GB2174217A (en) * 1985-04-25 1986-10-29 Otis Elevator Co Backup position signalling in an elevator
FR2586311A1 (fr) * 1985-08-17 1987-02-20 Bosch Gmbh Robert Dispositif de circuit comprenant un microcalculateur et une memoire a semi-conducteurs en echange de donnees avec ce microcalculateur, notamment pour vehicules automobiles
US4754851A (en) * 1985-04-15 1988-07-05 Mitsubishi Denki Kabushiki Kaisha Control apparatus for elevator
WO1988009584A1 (en) * 1987-05-20 1988-12-01 Otis Elevator Company Alternating current motor control system with emergency control

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5127523B2 (de) * 1972-08-03 1976-08-13

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4142609A (en) * 1976-12-13 1979-03-06 Mitsubishi Denki Kabushiki Kaisha Elevator control system
US4124103A (en) * 1977-03-09 1978-11-07 Westinghouse Electric Corp. Elevator system
GB2063522A (en) * 1979-11-22 1981-06-03 Hitachi Ltd Apparatus for determining elevator car position
GB2111251A (en) * 1981-11-16 1983-06-29 Mitsubishi Electric Corp Apparatus for operating an ac powered lift
US4754851A (en) * 1985-04-15 1988-07-05 Mitsubishi Denki Kabushiki Kaisha Control apparatus for elevator
GB2174217A (en) * 1985-04-25 1986-10-29 Otis Elevator Co Backup position signalling in an elevator
FR2586311A1 (fr) * 1985-08-17 1987-02-20 Bosch Gmbh Robert Dispositif de circuit comprenant un microcalculateur et une memoire a semi-conducteurs en echange de donnees avec ce microcalculateur, notamment pour vehicules automobiles
WO1988009584A1 (en) * 1987-05-20 1988-12-01 Otis Elevator Company Alternating current motor control system with emergency control

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010079258A1 (en) * 2009-01-12 2010-07-15 Kone Corporation Transportation system
EP2382149A1 (de) * 2009-01-12 2011-11-02 Kone Corporation Transportsystem
CN102272032A (zh) * 2009-01-12 2011-12-07 通力股份公司 运输系统
US8177033B2 (en) 2009-01-12 2012-05-15 Kone Corporation Transportation system with capacitive energy storage and non-volatile memory for storing the operational state of the transportation system upon detection of the operational anomaly in power
EP2382149A4 (de) * 2009-01-12 2012-06-06 Kone Corp Transportsystem
CN102272032B (zh) * 2009-01-12 2014-10-22 通力股份公司 运输系统
ES2394334A1 (es) * 2012-07-06 2013-01-30 Coapsa Control, S.L. Dispositivo de emergencia para descenso seguro de cargas
WO2023284291A1 (zh) * 2021-07-14 2023-01-19 日立楼宇技术（广州）有限公司 电梯停电应急设备、方法、装置及电梯

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Publication number Publication date
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