WO2005065160A2 - Appareil et procede permettant de detecter la vitesse d'un chariot elevateur - Google Patents

Appareil et procede permettant de detecter la vitesse d'un chariot elevateur Download PDF

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Publication number
WO2005065160A2
WO2005065160A2 PCT/US2004/041727 US2004041727W WO2005065160A2 WO 2005065160 A2 WO2005065160 A2 WO 2005065160A2 US 2004041727 W US2004041727 W US 2004041727W WO 2005065160 A2 WO2005065160 A2 WO 2005065160A2
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WO
WIPO (PCT)
Prior art keywords
speed
elevator car
synchronous motor
brake
value
Prior art date
Application number
PCT/US2004/041727
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English (en)
Other versions
WO2005065160A3 (fr
Inventor
Jeong-Ki Shin
Original Assignee
Otis Elevator Company
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 Company filed Critical Otis Elevator Company
Publication of WO2005065160A2 publication Critical patent/WO2005065160A2/fr
Publication of WO2005065160A3 publication Critical patent/WO2005065160A3/fr

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Classifications

    • 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

Definitions

  • the present invention relates to an elevator system, and more particularly, to an apparatus and method for detecting the speed of an elevator car of a machine room-less elevator system in an operational mode of rescuing passengers trapped in the elevator car.
  • An elevator system is a vertical transport system that is invariably installed in a building, especially, in a high-rise building to provide convenience in moving between the floors of the building.
  • the car of the elevator system provides passengers or system managers with services of ascending, descending and stopping in response to their request.
  • a machine room-less elevator system tends to be increasingly popular for reasons of the aesthetics of the building exterior and efficient use of the inner building space.
  • Fig. 1 is a schematic block diagram showing the conventional machine room-less elevator system.
  • the conventional machine room-less elevator system generally comprises power source 16, voltage to frequency converter 17 for providing an adequate voltage and frequency for controlling a speed and load of an elevator car, synchronous motor 15 for moving the elevator car either in the upward or downward direction, brake 14 for activating or deactivating synchronous motor 15, encoder 19 for producing an electrical signal to control the speed of the elevator car, rescuing device 20 for rescuing passengers trapped in the elevator car when the elevator car stops between floors due to an accident, such as a power failure, and elevator control system 18 for controlling the above-mentioned elements.
  • an operator releases a brake in order to move the elevator car to a safe door zone and then opens the door of the elevator car by force to rescue passengers trapped in the elevator car.
  • the operator supplies power to the brake though the rescuing device equipped in the elevator system to move the elevator car to a safe door zone and then opens the door of the elevator car.
  • the descending speed of the elevator car is detected with a governor in the rescuing device or a separate speed detector, and the brake is controlled so that the descending speed of the elevator car does not exceed a preset standard speed.
  • the conventional rescuing device comprises battery control unit 1, battery 2, voltage converter 3, overspeed detection unit 4, rescue enable switch 6, overspeed safety switch 7, brake release switch 8, brake release indicator 9, speed indicator 10 and door zone indicator 12.
  • Battery control unit 1 maintains the charging status of battery 2 by transmitting power from power source 16 (shown in Fig. 1) to battery 2 in the case of power failure.
  • Rescuing device 20 has three operational modes, normal mode, rescuing mode and brake test mode, from which the operator manually selects one operational mode.
  • voltage converter 3 converts a voltage from battery 2 into a voltage for driving brake 14.
  • Encoder 5 detects the descending speed of the elevator car and converts the descending speed into an electrical signal.
  • encoder 5 may be a speed encoder, however other speed detection devices may be used on behalf of speed encoder 5.
  • Overspeed detection unit 4 receives an electrical signal indicative of the descending speed of the elevator car from encoder 5 and decides whether the speed of the elevator car corresponds to an overspeed.
  • overspeed detection unit 4 decides whether the speed value obtained from the electrical signal exceeds a preset standard speed value, generates an alarm signal through speed indicator 10 coupled thereto, locks brake 14 by blocking the transmission of a voltage from voltage converter 3 to brake 14 in order to stop the descending elevator car.
  • Speed indicator 10 receives and displays the descending speed as calculated in the overspeed detection unit 4.
  • Overspeed detection unit 4 receives location information on the nearest safe landing place for the passengers trapped in the elevator car and displays the location information on door zone indicator 12.
  • Overspeed safety switch 7 is used only when the elevator car descending with a speed exceeding the preset standard speed cannot stop at a desired location. Overspeed safety switch 7 locks brake 14 by blocking the transmission of the power from voltage converter 3 to brake 14 under the control of governor 13, and stops the descending elevator car.
  • Brake release switch 8 is operated manually by the operator and functions to release and lock brake 14. For example, if the status of brake release switch 8 is on, the power is transmitted from voltage converter 3 to brake 14, and brake 14 is released. On the other hand, if the status of brake release switch 8 is off, the transmission of power is blocked and brake 14 is locked. Brake release indicator 9 indicates information on the release/lock status of brake 14 depending on the on/off status of brake release switch 8. In a conventional elevator system comprising the above mentioned rescuing device, if the passengers are trapped in the elevator car between floors due to an accident, such as a power failure, rescuing device 20 is operated manually by switching rescuing enable switch 6.
  • Fig. 3 shows a block diagram showing a conventional overspeed detection unit shown in Fig. 2.
  • Overspeed detection unit 4 comprises pulse counter 41, speed operator 48, speed indicating signal outputting unit 43, standard speed setting unit 42 and overspeed decision unit 44.
  • Pulse counter 41 receives, from encoder 5 within the system, pulse signals of the descending speed of the elevator car.
  • Pulse counter 41 then counts the number of pulses in the pulse signals, and transmits it to speed operator 48.
  • Speed operator 48 operates to calculate the descending speed of the elevator car based on the counted number of pulses from pulse counter 41 and transfers it to overspeed decision unit 44 and speed indicator 10 of the rescuing device through speed indicating signal outputting unit 43.
  • Standard speed setting unit 42 sets a standard speed based on an allowable maximum descending speed of the elevator car.
  • Overspeed decision unit 44 decides whether the descending speed of the elevator car exceeds the standard speed by comparing the descending speed of the elevator car with the standard speed.
  • overspeed detection unit 4 controls the power to be transmitted from a voltage converter (not shown) to the brake of the rescuing device. Accordingly, the brake is released to allow the elevator car to move downward continuously.
  • overspeed detection unit 4 cuts the power to the brake so that the brake is locked to stop the descending elevator car. In this fashion, the descending speed of the elevator car is adjusted under the control of overspeed detection unit 4 until the elevator car arrives at a location where passengers trapped in the elevator car can be rescued safely.
  • the drawbacks encountered with the conventional rescuing device is that it needs a costly speed-detecting device, such as an encoder, for detecting the descending speed of the elevator car, and that the safety of the passengers may be endangered by a breakdown of the encoder.
  • DISCLOSURE OF THE INVENTION TECHNICAL PROBLEM Accordingly, the present invention is provided to solve the above problem. It is, therefore, an object of the present invention to provide an apparatus and method for detecting the speed of an elevator car without a speed-detecting unit such as an encoder. It is another object of the present invention to provide a rescuing device which can easily and economically detect the speed of an elevator car.
  • an apparatus for detecting a speed of an elevator car, in a machine room-less elevator system, having a synchronous motor for moving the elevator car in an upward and downward direction and a brake for activating and deactivating the synchronous motor, said apparatus comprising: a frequency to voltage converter for converting a frequency of a counter electromotive force generated from the synchronous motor into a corresponding voltage during a descending period of the elevator car; an analog to digital converter for converting the voltage into a digital value; a table for storing a plurality of preset speed values; and a speed determination unit for selecting one speed value corresponding to the converted digital value among the plurality of preset speed values.
  • an apparatus for detecting a speed of an elevator car, in a machine room-less elevator system, having a synchronous motor for moving the elevator car in an upward and downward direction and a brake for activating and deactivating the synchronous motor, said apparatus comprising: an analog to digital converter for converting a magnitude of a counter electromotive force generated from the synchronous motor into a corresponding a digital value; a table for storing a plurality of preset speed values; and a speed determination unit for selecting one speed value corresponding to the digital value among the plurality of preset speed values.
  • an apparatus for detecting a speed of an elevator car, in a machine room-less elevator system, having a synchronous motor for moving the elevator car in an upward and downward direction and a brake for activating and deactivating the synchronous motor, said apparatus comprising: a database for storing a plurality of parameter sets, wherein each of the parameter set has parameters including a number of poles, a diameter of a sheave and a number of windings of a rope, and wherein the rope is wound to the sheave coupled to the elevator car; a speed determination unit for determining a speed of the elevator car by applying one parameter set from the database and a frequency of a counter electromotive force generated from the synchronous motor to the following equations: 120 .
  • rpm revolutions per minute of the synchronous motor
  • rps revolutions per second of the synchronous motor
  • f ' is the frequency of the counter electromotive force
  • P is the number of the poles of the synchronous motor
  • Vcar is the speed of the elevator car
  • a rescuing device of a machine room-less elevator system having a synchronous motor for moving an elevator car in an upward and downward direction and a brake for activating and deactivating the synchronous motor, comprising: a speed detection unit for detecting a speed of the elevator car, wherein the speed detection unit includes: a frequency to voltage converter for converting a frequency of a counter electromotive force generated from the synchronous motor into a corresponding voltage during a descending period of the elevator car; an analog to digital converter for converting the voltage into a digital value; a table for storing a plurality of preset speed values; and a speed determination unit for selecting one speed value corresponding to the digital value among the plurality of preset speed values.
  • a method of detecting a speed of an elevator car in a machine room-less elevator system having a synchronous motor for moving the elevator car in an upward and downward direction and a brake for activating and deactivating the synchronous motor, comprising the steps of: converting a frequency of a counter electromotive force generated from the synchronous motor into a corresponding voltage during a descending period of the elevator car; converting the voltage into a digital value; storing a plurality of preset speed values; and selecting one speed value corresponding to the digital value among the plurality of preset speed values.
  • a method of detecting of a speed of an elevator car in a machine room-less elevator system having a synchronous motor for moving the elevator car in an upward and downward direction and a brake for activating and deactivating the synchronous motor, comprising the steps of: converting a magnitude of a counter electromotive force generated from the synchronous motor into a corresponding digital voltage value during a descending period of the elevator car; storing a plurality of preset speed values; and selecting one speed value corresponding to the digital value among the plurality of preset speed values.
  • Fig. 1 is a schematic block diagram showing a conventional machine-room less elevator system.
  • Fig. 2 is a schematic block diagram showing the rescuing device shown in Fig. 1.
  • Fig. 3 is a schematic block diagram showing the overspeed detection unit shown in Fig. 2.
  • Fig. 4 is a schematic block diagram showing a rescuing device having an overspeed detection unit in accordance with an embodiment of the present invention.
  • Fig. 5 is a schematic diagram of the overspeed detection unit shown in Fig. 4.
  • Fig. 6 is a schematic block diagram showing a rescuing device having a speed detection unit of in accordance with another embodiment of the present invention.
  • Fig. 7 is a plane view showing a schematic structure of an elevator system.
  • Fig. 4 is a schematic block diagram showing a rescuing device having an overspeed detection unit of elevator car in accordance with a first embodiment the present invention.
  • rescuing device 50 comprises battery control unit 51, battery 52, voltage converter 53, door zone indicator 54, speed indicator 55, rescue enable switch 56, overspeed safety switch 57, brake release switch 58, brake release indicator 59, and overspeed detection unit 60.
  • Rescuing device 50 of the present invention is the same as the conventional rescuing device shown in Fig. 2 except that rescuing device 50 does not comprise an encoder.
  • a counter electromotive force generated from a synchronous motor is used to detect the speed of the elevator car without using the encoder in an operational mode of rescuing passengers trapped in the elevator car.
  • Synchronous motor 100 which moves the elevator car up and down, comprises a rotor made of a permanent magnet and a stator made of a coil. If the rotator rotates by a force applied from outside of synchronous motor 100, a counter electromotive force, whose frequency and amplitude are proportional to the rotational speed of the rotor, is induced in the coil of the stator.
  • Synchronous motor 100 moves the elevator car up and down by using an electromotive force corresponding to the counter electromotive force.
  • the moving speed of the elevator car is proportional to the rotational speed of the rotor of synchronous motor 100 because the elevator car can be moved by the motor to which the elevator car is connected though a rope. Consequently, if a counter electromotive force generated from the synchronous motor is detected, the moving speed of the elevator car can be detected.
  • the descending speed of the elevator car can advantageously be observed by detecting the counter electromotive force generated from synchronous motor 100.
  • Overspeed detection unit 60 equipped in rescuing device 50 is illustrated in Fig. 5.
  • overspeed detection unit 60 comprises voltage divider 61, frequency to voltage converter 62, analog to digital converter 63, speed table 64, speed determination unit 65, standard speed setting unit 66, overspeed decision unit 67 and speed indicating signal outputting unit 68.
  • Voltage divider 64 receives a signal indicative of the counter electromotive force generated from synchronous motor 100 of the system and divides the amplitude of the signal into a small voltage signal, e.g., hundreds of volts into several volts. Then the minimized signal is provided to analog to digital converter 63, either directly or via frequency to voltage converter 62.
  • Analog to digital converter 63 converts the minimized signal into a corresponding digital value.
  • the minimized signal is fed to frequency to voltage converter 62 prior to be supplied to analog to digital converter 63.
  • Frequency to voltage converter 62 converts the frequency of the signal into a voltage proportional to the frequency of the signal.
  • analog to digital converter 63 performs an analog to digital conversion upon the voltage provided by frequency to voltage converter 62.
  • Speed table 64 stores a plurality of preset speed data of the elevator car in association with standard rotational speed values such that each of the standard rotational speed values can be mapped to a respective one of the preset speed data.
  • Speed table 64 may be implemented by a look-up table or the like.
  • the number of the standard rotational speed values to be stored in speed table 64 may preferably be selected to cover the expected range of the digital values from analog to digital converter 63.
  • Speed determination unit 65 is responsive to the digital value from analog to digital converter 63 to select one of the preset speed data from speed table 64. Speed determination unit searches speed table 64 for one of the standard rotational speed values that matches with the digital value from analog to digital converter 63. Upon finding the matching standard rotational speed value, speed determination unit 65 refers to the speed data associated with the matching standard rotational speed value to determine the descending speed of the elevator car. The descending speed of the elevator car is provided to overspeed decision unit 67 and speed indicator 55 of the rescuing device through speed indicating signal outputting unit 68.
  • Standard speed setting unit 66 presets a standard speed value based on an allowable maximum descending speed of the elevator car, which may be set by the operator or the system manufacturer.
  • Overspeed decision unit 67 compares the descending speed of the elevator car, as determined in the way explained above, with the preset standard speed value, and decides whether the descending speed of the elevator car exceeds the preset standard speed value.
  • the overspeed detection unit according to an embodiment of the present invention can advantageously detect the descending speed of the elevator car without a separate speed-detecting device, as explained above.
  • the inventive overspeed detection unit makes use of the counter electromotive force generated from the synchronous motor of the system.
  • Fig. 6 is a schematic diagram showing an overspeed detection unit in accordance with another embodiment of the present invention, and Fig.
  • Overspeed detection unit 60 a comprises voltage divider 61, speed determination unit 65, standard speed setting unit 66, speed indicating signal output unit 68, overspeed decision unit 67, and database 69.
  • Database 69 stores a plurality of parameter sets each of which may include parameters such as the number of poles, diameter of a sheave and number of windings of a rope.
  • speed determination unit 67 uses the parameter set stored in the database to decide the descending speed of the elevator car.
  • the descending speed of the elevator is the same as the rotational speed of the sheave to which rope is wound, and the rotational speed of the sheave is the same as that of synchronous motor 100 when the rescuing device is operated in rescuing mode.
  • Speed determination unit 65 selects one parameter set designating the particular number of poles of synchronous motor 100, a particular diameter of the sheave and the particular number of windings of the rope in database 69. Overspeed determination unit 65 can decide a descending speed of the elevator by applying values from the parameter set to equations (1) to
  • overspeed decision unit 67 decides whether the descending speed of the elevator car exceeds the standard speed value based on the speed of the elevator car inputted from speed determination unit 65 and the standard speed value inputted from standard speed setting unit 66, locks or releases the brake, and controls the speed of the descending elevator car in which passengers are trapped.
  • the present invention may be embodied in other specific forms without departing from its spirit or essential characteristics.
  • the described embodiments are to be considered in all respects only as illustrative and not restrictive.
  • the scope of the invention is, therefore, indicated by the appended claims, rather than by the foregoing description. All changes, which come within the equivalent meaning and range of the claims, are to be embraced within their scope.
  • the speed of the elevator car may be detected with the use of the counter electromotive force generated from the synchronous motor. Therefore, the costs can be reduced because as an encoder is not required for the speed detector, and the reliability and efficiency of the detecting speed can be improved. Also, a rescuing device may be provided that adopts a speed detecting unit with high efficiency.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mechanical Engineering (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Elevator Control (AREA)

Abstract

La présente invention concerne un appareil et un procédé permettant de détecter la vitesse d'un chariot élévateur dans un système élévateur sans chambre de machine, qui possède un moteur synchrone destiné à déplacer le chariot élévateur vers le haut ou vers le bas et un frein permettant d'activer et de désactiver ce moteur synchrone. Un convertisseur de fréquence en tension convertit la fréquence d'une force contre-électromotrice générée à partir du moteur synchrone en une tension correspondante pendant une période de descente de l'élévateur. Une unité de conversion analogique numérique convertit cette tension en une valeur numérique. Une table stocke une pluralité de valeurs de vitesse préfixées. Une unité de détermination de vitesse sélectionne une valeur de vitesse correspondant à la valeur numérique parmi la pluralité des valeurs de vitesse préfixées et détermine la valeur sélectionnée comme étant la vitesse du chariot élévateur.
PCT/US2004/041727 2003-12-26 2004-12-13 Appareil et procede permettant de detecter la vitesse d'un chariot elevateur WO2005065160A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2003-0097074 2003-12-26
KR20030097074A KR100610288B1 (ko) 2003-12-26 2003-12-26 엘리베이터 카 속도 검출 장치 및 방법

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WO2005065160A3 WO2005065160A3 (fr) 2005-11-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102311020A (zh) * 2011-08-19 2012-01-11 宁波市鸿腾机电有限公司 节能电梯系统的层站激活装置及其控制方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5612517A (en) * 1993-09-15 1997-03-18 Inventio Ag Process and apparatus for controlling a hydraulic lift
US20050077113A1 (en) * 2002-01-31 2005-04-14 Romeo Deplazes Elevator, particularly for transporting persons

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000118917A (ja) 1998-10-08 2000-04-25 Hitachi Building Systems Co Ltd 油圧エレベータの停電時着床制御装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5612517A (en) * 1993-09-15 1997-03-18 Inventio Ag Process and apparatus for controlling a hydraulic lift
US20050077113A1 (en) * 2002-01-31 2005-04-14 Romeo Deplazes Elevator, particularly for transporting persons

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102311020A (zh) * 2011-08-19 2012-01-11 宁波市鸿腾机电有限公司 节能电梯系统的层站激活装置及其控制方法

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WO2005065160A3 (fr) 2005-11-03
KR100610288B1 (ko) 2006-08-09
KR20050065909A (ko) 2005-06-30

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