EP1997766A1 - Aufzug - Google Patents

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Publication number
EP1997766A1
EP1997766A1 EP08008669A EP08008669A EP1997766A1 EP 1997766 A1 EP1997766 A1 EP 1997766A1 EP 08008669 A EP08008669 A EP 08008669A EP 08008669 A EP08008669 A EP 08008669A EP 1997766 A1 EP1997766 A1 EP 1997766A1
Authority
EP
European Patent Office
Prior art keywords
speed
car
actuated
brake device
setting speed
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.)
Granted
Application number
EP08008669A
Other languages
English (en)
French (fr)
Other versions
EP1997766B1 (de
Inventor
Atsushi Arakawa
Takashi Teramoto
Atsuya Fujino
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP1997766A1 publication Critical patent/EP1997766A1/de
Application granted granted Critical
Publication of EP1997766B1 publication Critical patent/EP1997766B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
    • B66B5/06—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed electrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/24—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration
    • B66B1/28—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical
    • B66B1/32—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical effective on braking devices, e.g. acting on electrically controlled brakes

Definitions

  • the present invention relates to an elevator that brakes an elevator car to a stop when the elevator car reaches an abnormal speed.
  • a conventional elevator applies the brake (electric motor brake) to actuate the mechanical emergency stop device when the speed exceeds its rated speed.
  • a buffer is also provided on the bottom of the shaft considering a case in which the brake and the emergency stop device cannot stop the elevator. Because the buffer size must be determined according to the rated speed of the elevator, a higher elevator rated speed requires a larger buffer which, in turn, requires a longer shaft.
  • the actuation speed of the electric motor brake (first brake device, electric motor brake) and the emergency stop device (second brake device, mechanical brake) gets lower and, at the same time, the difference between the speed at which the brake is actuated and the speed at which the emergency stop device is actuated gets smaller.
  • the actuation time of the emergency stop device is reached within the time difference between the time the brake receives a command and the time the brake is actually actuated and, as a result, there is the possibility that, though the car can be stopped only by the brake, the emergency stop device is actuated.
  • an elevator brake system that solves the problems of the related art described above and that implements an elevator that reduces the wasteful actuations of the emergency stop device and makes the shaft shorter.
  • an elevator having a first setting speed that is set according to a position of an elevator car moving vertically along a guide rail in a shaft and a second setting speed that is set higher than the first setting speed wherein a first brake device is actuated when a speed of the car becomes higher than the first setting speed and a second brake device is actuated when the speed of the car becomes higher than the second setting speed, the elevator further having a third setting speed that is set higher than the second setting speed; and a vibration detector that detects a change in the speed of the car when the speed of the car exceeds the first setting speed and the first brake device is actuated wherein the second brake device is actuated based on the change in the speed of the car and on the second setting speed or the third setting speed.
  • the electric motor brake that is the first brake device is actuated first and, based on the car position and the setting speed, a check is made if it is possible to brake the elevator only by the electric motor brake and, if necessary, the emergency stop device that is the second brake device is actuated.
  • This structure prevents the emergency stop device from being actuated unnecessarily with no damage on the guide rail and makes the shaft shorter.
  • FIGS. 1A and 1B are diagrams showing the configuration of an elevator brake system.
  • the above diagrams generally show an elevator in which a car 70 moves vertically in the shaft along a guide rail 75.
  • a sheave 76 and a first brake device 11 are connected to an electric motor 73.
  • a rope 77 is wound on the sheave 76, and the car 70 and a counterweight 78 are attached to the rope 77.
  • a second brake device 13 is attached to the car 70.
  • Sensors 71 and 72 which detect the position and the speed of the car 70, are provided on the car 70 and the electric motor 73.
  • a first brake device controller 10 and a second brake device controller 20, though not shown, are built in a control device 74, and the first brake device 11 and the second brake device 13 are actuated by the information from the sensors 71 and 72.
  • a car position detector 1 a detector that measures the position of the car, is a device that reads the encoder, attached to the motor or the governor pulley, or reads the markers attached to the shaft.
  • a car speed detector 2 which detects the speed of a moving car, calculates the speed from the signal of the encoder attached to the motor or the governor pulley or from the signal of the reader that reads the markers attached to the shaft at a fixed interval.
  • a first setting speed generator 3 sets the speed to a speed higher than the operating speed at a car position based on the generated car operating speed pattern
  • a second setting speed generator 4 generates a speed that is set higher than the speed generated by the first setting speed generator 3
  • a third setting speed generator 5 generates a speed higher than the speed generated by the second setting speed generator 4.
  • a comparator 6 compares the car position detected by the car position detector 1, the car speed at the car position detected by the car speed detector 2, and the car setting speed generated by the first setting speed generator 3 and, when the car speed becomes higher than the first setting speed, outputs a signal to the first brake device controller 10 to actuate the first brake device 11.
  • a comparator 7 compares the car position, the car speed, and the car setting speed generated by the second setting speed generator 4.
  • a comparator 9 compares the car position, the car speed, and the car setting speed generated by the third setting speed generator 5.
  • a vibration detector 8 extracts a vibration component from the signal detected by the car speed detector 2 to check for a change in the car speed and, more particularly, to check whether the car is vibrating.
  • a second brake device controller 12 drives the second brake device 13 based on the output from the comparator 7, comparator 9, and vibration detector 8.
  • FIG. 2 shows an example of setting speed patterns generated by the first setting speed generator 3, second setting speed generator 4, and third setting speed generator 5.
  • the target speed of a car when it moves from the lowest floor to the highest floor or from the highest floor to the lowest floor is set by a target speed 20 that is indicated by the dotted line.
  • the actuation speed of the electric motor brake which is the first brake device, is set to a first setting speed 21 that is higher than the target speed 20, and a second setting speed 22 is set to a value higher than the first setting speed 21.
  • the second setting speed 22 is set by the following expression so that the electric motor brake is actuated to stop the car before it hits the buffer at the bottom of the shaft.
  • V 2 2 ⁇ a b ⁇ h + ⁇
  • V 2 is the second setting speed
  • a b is the average deceleration speed when the electric motor brake is actuated
  • h is the car position from the top face of the buffer installed at the bottom of the shaft
  • ⁇ is the margin speed.
  • a third setting speed 23, which is a speed still higher than the second setting speed 22, is set by the following expression so that the emergency stop device is actuated to stop the car before it hits the buffer at the bottom of the shaft.
  • V 3 2 ⁇ a s ⁇ h + ⁇
  • V 3 is the third setting speed, as is the average deceleration speed when the emergency stop device is actuated, and ⁇ is the margin speed.
  • the constant speed of the second setting speed 22 and the third setting speed 23 is set to a speed that is 1.4 times as high as the constant speed line of the car target speed 20.
  • the setting speed for actuating the emergency stop device, the second brake device should be changed depending upon whether or not a large vibration component is included in the signal from the car speed detector 2. For example, a large vibration component, though not included in the car speed signal when the car speed is increased because of a rope slippage, a rope breakage, or an insufficient power of the first brake device, is included in the car speed signal when the car is strongly swung out of mischief.
  • the emergency stop device that is, the second brake device
  • the emergency stop device must be actuated immediately; on the other hand, when a strong vibration in the car is generated by a mischief, the emergency stop device need not always be actuated because the vibration will stop soon.
  • the signal output from the car speed detector 2 is input to the vibration detector 8 to check if a large vibration is included. If a large vibration component is not included, the second brake device is actuated when the car speed exceeds the second setting speed. If it is determined that a large vibration component is included in the signal received from the car speed detector 2, the second brake device is actuated when the car speed exceeds the third setting speed.
  • the cause of the abnormal speed of the car is checked to see whether the abnormal speed is caused by a rope slippage, a rope breakage, or an insufficient power of the electric motor brake or by a large vibration generated by a mischief and, based on the checking result, the actuation speed of the second brake device is selected. Selecting the actuation speed of the second brake device in this way prevents the emergency stop device from being actuated if the car can be stopped simply by actuating the electric motor brake, and this operation mode makes the shaft shorter.
  • the speed waveform generated when a passenger wobbles the car is, for example, as shown by the numeral 24 in FIG. 3A .
  • the vibration gets larger as shown by the numeral 24.
  • the speed waveform generated when the car speed is increased because of a rope slippage, a rope breakage, or an insufficient power of the electric motor brake is indicated by the numeral 25 in FIG. 3B .
  • the signal of the car speed detector 2 is input to the vibration detector 8 shown in FIG. 4 .
  • the vibration detector 8 comprises a filter 8a and a determiner 8b.
  • the filter 8a extracts the value of the vibration component, which is the difference between the minimum and the maximum of the signal from the car speed detector 2 when the signal has changed.
  • the value of the vibration component is compared with the threshold stored in the determiner 8b in advance. If the value of the vibration component is larger than the threshold, it is determined that there is a vibration component and that the abnormal speed is caused by a mischief. If the value of the vibration component is smaller than the threshold, it is determined that the abnormal speed is caused by a rope slippage, a rope breakage, or an insufficient power of the electric motor brake.
  • FIG. 5 is a diagram showing an example of the characteristic of the filter 8a, and the numeral 26 indicates the gain characteristic of the filter.
  • a large vibration is generated in the car when the disturbance source has a frequency component near the characteristic frequency of the car and a resonance is generated. So, it is desirable that the filter 8a have the gain of 1.0 near the characteristic frequency of the car and have a low gain in other frequency bandwidths.
  • the characteristic frequency of the car varies according to a change in the load capacity and the rope length and so, to cover this variation, the filter 8a should have the gain of 1.0 in the bandwidth at least from the minimum characteristic frequency f 1 to the maximum characteristic frequency f 2 .
  • FIG. 6 is a diagram showing the concept of the result generated by passing the waveforms 24 and 25 shown in FIGS. 3A and 3B through the filter 8a having the characteristics 26 shown in FIG. 5 .
  • a waveform 27 shown in FIG. 6A is the result generated by passing the waveform 24 shown in FIG. 3A through the filter 8a and, in this case, the vibration component is extracted.
  • a waveform 28 shown in FIG. 6B is the result generated by passing the waveform 25 shown in FIG. 3B through the filter 8a and, in this case, a little or no output is generated.
  • Evaluating the amplitude of the vibration waveform with the threshold set as shown in FIGS. 6A and 6B makes it possible to determine if the signal from the car speed detector 2 includes a vibration component. Although the amplitude is used for this determination in this example, the waveform area can also be used.
  • the absolute value of the waveform generated after the first brake device is actuated is added up and, if the added value exceeds the threshold, it is determined that the speed has reached an abnormal speed caused by a mischief.
  • the FFT(Fast Fourier Transform) processing may also be performed for the signal from the car speed detector 2 to extract the vibration component.
  • the FFT processing gives the frequency and the power spectrum of a prominent vibration component that makes it possible to determine that, when the frequency of the prominent component is near the characteristic frequency and the power spectrum exceeds the threshold, the speed has reached an abnormal speed caused by a mischief.
  • FIG. 7 is a flowchart showing the general processing of the operation described above.
  • the first, second, and third setting speed patterns are generated in step 31 based on the operation pattern generated in step 30.
  • the car position and the car speed are detected to monitor for an abnormal condition.
  • step 33 a check is made if the car speed exceeds the first setting speed to determine if there is an abnormal condition. If the car speed exceeds the first setting speed, the first brake device is actuated in step 34.
  • the car position and the car speed are monitored even after the first brake device is actuated (step 35) and, in step 36, an analysis is made to determine if the car speed includes a vibration component.
  • step 37 If a vibration component larger than the pre-set numeric value is not included (step 37), a check is made in step 38 if the car speed has reached the second setting speed. If the car speed has not reached the second setting speed, control is passed back to step 35 to continue monitoring the car position and the car speed and, if the car speed has reached the second setting speed, the second brake device is actuated.
  • step37 If a vibration component larger than the pre-set numeric value is included in step37 and if the car speed has not reached the third setting speed, control is passed back to step 35. If the car speed has reached the third setting speed, the second brake device is actuated.
  • the car acceleration is detected and, using the detected information, a second brake device 13 is controlled.
  • a second brake device 13 is controlled.
  • To detect the car acceleration it is possible to attach an acceleration pickup to the car as a car acceleration detector 40 or to calculate the acceleration from the signal received from a car speed detector 2.
  • the car acceleration speed information is used to quickly detect an abnormal acceleration caused by a rope breakage. If the acceleration is continuously increased, the second brake device is actuated to stop the car.
  • FIG. 9 is a general flowchart in which the flow to step 54 is the same as that in FIG. 7 .
  • step 54 the car position, speed, and acceleration are monitored (step 55) and, when the car acceleration has exceeded the pre-set numeric value, the car speed is analyzed for a vibration (step 57). If a vibration component equal to or larger than the setting value is detected, the second brake device is actuated. On the other hand, if a vibration component equal to or larger than the setting value is not detected, control is passed to step 60 and, if the car speed has reached the third setting speed, the second brake device is actuated.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Elevator Control (AREA)
  • Types And Forms Of Lifts (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
EP08008669A 2007-05-09 2008-05-08 Aufzug Not-in-force EP1997766B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007124055A JP4924191B2 (ja) 2007-05-09 2007-05-09 エレベーター

Publications (2)

Publication Number Publication Date
EP1997766A1 true EP1997766A1 (de) 2008-12-03
EP1997766B1 EP1997766B1 (de) 2009-12-09

Family

ID=39616520

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08008669A Not-in-force EP1997766B1 (de) 2007-05-09 2008-05-08 Aufzug

Country Status (5)

Country Link
EP (1) EP1997766B1 (de)
JP (1) JP4924191B2 (de)
CN (1) CN101301977B (de)
AT (1) ATE451320T1 (de)
DE (1) DE602008000370D1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011086230A1 (en) 2010-01-18 2011-07-21 Kone Corporation Method for monitoring the movement of an elevator car, and an elevator system
DE102016100533A1 (de) * 2016-01-14 2017-07-20 Thyssenkrupp Ag Verfahren zum Überwachen einer ersten Bremse eines Fahrkorbs eines Aufzugsystems
CN113716423A (zh) * 2020-05-26 2021-11-30 奥的斯电梯公司 紧急终端停止系统

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5241623B2 (ja) * 2009-06-11 2013-07-17 株式会社日立製作所 安全装置付きエレベーター
JP5529075B2 (ja) * 2011-05-25 2014-06-25 株式会社日立製作所 エレベータ
CN102718100B (zh) * 2012-06-13 2015-06-17 中山市卓梅尼控制技术有限公司 电梯故障预警系统及其预警方法
JP6307406B2 (ja) * 2014-09-26 2018-04-04 株式会社日立製作所 エレベータ装置
JP6272199B2 (ja) * 2014-09-26 2018-01-31 株式会社日立製作所 エレベータ装置およびエレベータ装置の電子安全システムの点検方法
JP6627636B2 (ja) * 2016-04-22 2020-01-08 フジテック株式会社 振動異常検知装置およびエレベータ制御システム
CN106429697B (zh) * 2016-09-13 2018-09-28 江苏旭云物联信息科技有限公司 一种电梯安全预警系统
DE112018000894T5 (de) * 2017-02-17 2019-10-31 Mitsubishi Electric Corporation Fahrstuhleinrichtung
CN108639892B (zh) * 2018-07-25 2020-07-10 厦门乃尔电子有限公司 一种电梯轿厢速度检测系统及方法
US11866295B2 (en) 2018-08-20 2024-01-09 Otis Elevator Company Active braking for immediate stops
US11673769B2 (en) * 2018-08-21 2023-06-13 Otis Elevator Company Elevator monitoring using vibration sensors near the elevator machine
JP7140634B2 (ja) * 2018-10-30 2022-09-21 株式会社日立製作所 エレベーターの制御システム
CN112850405B (zh) * 2020-12-31 2022-10-25 重庆能源职业学院 一种基于mems系统的电梯轿厢振动管理系统

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WO2004028947A1 (ja) 2002-09-24 2004-04-08 Mitsubishi Denki Kabushiki Kaisha エレベーター安全システム
WO2004031064A1 (ja) 2002-10-04 2004-04-15 Hitachi, Ltd. エレベーターシステム
JP2006298539A (ja) * 2005-04-19 2006-11-02 Mitsubishi Electric Corp エレベーター装置の異常検出装置

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JPS58135075A (ja) * 1982-02-08 1983-08-11 三菱電機株式会社 エレベ−タの終端階減速装置
JPH04169486A (ja) * 1990-10-31 1992-06-17 Toshiba Corp エレベータの安全警報装置
JP2614672B2 (ja) * 1990-11-22 1997-05-28 株式会社日立製作所 エレベーターのいたずら揺動防止装置
JPH08113441A (ja) * 1994-10-14 1996-05-07 Hitachi Building Syst Eng & Service Co Ltd エレベーターの異常振動検出装置
JP4705407B2 (ja) * 2005-05-13 2011-06-22 株式会社日立製作所 エレベータ制御装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004028947A1 (ja) 2002-09-24 2004-04-08 Mitsubishi Denki Kabushiki Kaisha エレベーター安全システム
DE10392710T5 (de) * 2002-09-24 2005-09-15 Mitsubishi Denki K.K. Aufzugsicherheitssystem
WO2004031064A1 (ja) 2002-10-04 2004-04-15 Hitachi, Ltd. エレベーターシステム
JP2006298539A (ja) * 2005-04-19 2006-11-02 Mitsubishi Electric Corp エレベーター装置の異常検出装置

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011086230A1 (en) 2010-01-18 2011-07-21 Kone Corporation Method for monitoring the movement of an elevator car, and an elevator system
US8752677B2 (en) 2010-01-18 2014-06-17 Kone Corporation Elevator system including monitoring arrangement to activate emergency braking procedure based on deceleration and method of operating the same
EP2526041A4 (de) * 2010-01-18 2017-07-26 Kone Corporation Verfahren zur überwachung der bewegung eines fahrkorbs sowie ein aufzugsystem
US9776827B2 (en) 2010-01-18 2017-10-03 Kone Corporation Elevator system including monitoring arrangement to activate multiple emergency braking procedures associated with different decelerations and method of operating the same
DE102016100533A1 (de) * 2016-01-14 2017-07-20 Thyssenkrupp Ag Verfahren zum Überwachen einer ersten Bremse eines Fahrkorbs eines Aufzugsystems
CN113716423A (zh) * 2020-05-26 2021-11-30 奥的斯电梯公司 紧急终端停止系统
EP3915921A1 (de) * 2020-05-26 2021-12-01 Otis Elevator Company Nothaltestoppsysteme

Also Published As

Publication number Publication date
CN101301977B (zh) 2010-08-18
DE602008000370D1 (de) 2010-01-21
JP4924191B2 (ja) 2012-04-25
ATE451320T1 (de) 2009-12-15
CN101301977A (zh) 2008-11-12
EP1997766B1 (de) 2009-12-09
JP2008280109A (ja) 2008-11-20

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