EP0476460B1 - Dispositif de sécurité pour un entraînement d'un engin de levage - Google Patents

Dispositif de sécurité pour un entraînement d'un engin de levage Download PDF

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Publication number
EP0476460B1
EP0476460B1 EP91115099A EP91115099A EP0476460B1 EP 0476460 B1 EP0476460 B1 EP 0476460B1 EP 91115099 A EP91115099 A EP 91115099A EP 91115099 A EP91115099 A EP 91115099A EP 0476460 B1 EP0476460 B1 EP 0476460B1
Authority
EP
European Patent Office
Prior art keywords
motor
safety device
current
sum
hoisting
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.)
Expired - Lifetime
Application number
EP91115099A
Other languages
German (de)
English (en)
Other versions
EP0476460A3 (en
EP0476460A2 (fr
Inventor
Arnold Dipl.-Ing. Axmann
Reinhold Pütt
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0476460A2 publication Critical patent/EP0476460A2/fr
Publication of EP0476460A3 publication Critical patent/EP0476460A3/de
Application granted granted Critical
Publication of EP0476460B1 publication Critical patent/EP0476460B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/24—Operating devices
    • B66D5/30—Operating devices electrical

Definitions

  • the invention relates to a safety device for a hoist drive, in which a three-phase motor is connected to a converter with a variable output frequency and the motor is assigned a mechanical safety brake which can only be released when the torque of the motor has a predetermined value.
  • Such a safety device is known from DE-A-1 814 275.
  • the speed behavior is checked by means of a non-positively connected transducer to the hoist drive, and the current load behavior of the three-phase motor is checked by means of a measured value sensor arranged in the stator circuit of the three-phase motor.
  • the safety brake is activated when approaching, exceeding or falling below limit values.
  • the holding brake may only be released if there is sufficient torque in the electric motor to hold or start up the load. B. on casting cranes - can lead to serious accidents.
  • the object of the present invention is to provide a criterion for the safety device which indicates whether a sufficient level is present even at very low frequencies Current, ie sufficient moment is available and whether the current flows properly through the stator windings.
  • This object is achieved in that the electrical currents in the lines between the converter and motor can be detected and a signal proportional to the vectorial sum and a mean sum of the electrical currents is formed therefrom and that the brake release command is derived from the condition, that the vectorial sum lies below a predetermined first limit value and the mean sum lies above a second limit value.
  • the vectorial sum formation can be carried out relatively easily with a transformer 17 arranged in a star point connection and the mean value formation with a rectifier 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Claims (3)

  1. Dispositif de sécurité destiné à un entraînement d'engin de levage, dans lequel un moteur (2) à courant alternatif est connecté à un convertisseur de fréquence (1) à fréquence de sortie variable et dans lequel au moteur (2) est associé un frein (6) de sécurité mécanique qui ne peut être libéré que lorsque le couple de rotation du moteur (2) a une valeur fixée à l'avance, caractérisé en ce que les courants électriques (IR, IS, IT) passant dans les conducteurs entre le convertisseur de fréquence (1) et le moteur (2) peuvent être détectés par un capteur et en ce qu'ainsi un signal proportionnel à la somme vectorielle (Iv) et un signal proportionnel à la somme des valeurs moyennes (Ie) des courants électriques sont produits et que l'ordre de libération du frein (6) découle de la condition que la somme vectorielle est inférieure à une première valeur limite fixée à l'avance et que la somme des valeurs moyennes est supérieure à une deuxième valeur limite.
  2. Dispositif de sécurité pour un entraînement d'engin de levage, caractérisé par un circuit (11) d'évaluation de courant comportant un transformateur (17) connecté à des transformateurs de courant (8 à 10) situés dans le circuit de courant du moteur en vue d'effectuer la somme vectorielle et un redresseur (18) connecté aux transformateurs de courant (8 à 10) en vue de déterminer la valeur moyenne.
  3. Dispositif de sécurité destiné à un entraînement d'engin de levage selon la revendication 2, caractérisé par des avertisseurs (12, 13) de valeur limite, qui sont connectés au circuit d'évaluation de courant (11) et dont les signaux de sortie sont combinés en vue de l'émission de l'ordre.
EP91115099A 1990-09-21 1991-09-06 Dispositif de sécurité pour un entraînement d'un engin de levage Expired - Lifetime EP0476460B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4029993 1990-09-21
DE4029993 1990-09-21

Publications (3)

Publication Number Publication Date
EP0476460A2 EP0476460A2 (fr) 1992-03-25
EP0476460A3 EP0476460A3 (en) 1992-10-28
EP0476460B1 true EP0476460B1 (fr) 1994-04-27

Family

ID=6414733

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91115099A Expired - Lifetime EP0476460B1 (fr) 1990-09-21 1991-09-06 Dispositif de sécurité pour un entraînement d'un engin de levage

Country Status (2)

Country Link
EP (1) EP0476460B1 (fr)
DE (1) DE59101495D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103771270A (zh) * 2014-01-09 2014-05-07 苏州汇川技术有限公司 四绳抓斗起重机闭斗提升控制系统及方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0779239B2 (fr) * 1995-12-13 2006-09-13 Liebherr-Werk Ehingen GmbH Commande du système de levage d'une grue
FI115966B (fi) * 2000-08-29 2005-08-31 Kci Kone Cranes Int Oy Menetelmä ja laitteisto nostimen nostomoottorin jarrun avautumisen valvontaan
EP1244197A1 (fr) * 2001-03-22 2002-09-25 Danfoss Bauer GmbH Motoréducteur
CN108639980B (zh) * 2018-06-14 2024-04-09 广东省特种设备检测研究院顺德检测院 塔式起重机用起重量限制器检测装置
CN113620176B (zh) * 2020-05-09 2024-08-02 安川电机（中国）有限公司 起重设备的控制方法及其装置
CN112456335A (zh) * 2020-11-23 2021-03-09 杭州杰牌传动科技有限公司 一种具备预励磁功能的减速电机

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1880076U (de) * 1962-04-11 1963-10-03 Maschf Augsburg Nuernberg Ag Elektrische uberlastungssicherung fuer kranhubwerke.
DE1814275B2 (de) * 1968-12-12 1977-05-26 Elbag GmbH. 5421 Weisel Sicherheitseinrichtung fuer kranhubwerke
JPS492060B1 (fr) * 1970-06-23 1974-01-18

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103771270A (zh) * 2014-01-09 2014-05-07 苏州汇川技术有限公司 四绳抓斗起重机闭斗提升控制系统及方法

Also Published As

Publication number Publication date
EP0476460A3 (en) 1992-10-28
EP0476460A2 (fr) 1992-03-25
DE59101495D1 (de) 1994-06-01

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