EP1225150A1 - Device for noiseless operating of elevator brake - Google Patents

Device for noiseless operating of elevator brake Download PDF

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Publication number
EP1225150A1
EP1225150A1 EP01810020A EP01810020A EP1225150A1 EP 1225150 A1 EP1225150 A1 EP 1225150A1 EP 01810020 A EP01810020 A EP 01810020A EP 01810020 A EP01810020 A EP 01810020A EP 1225150 A1 EP1225150 A1 EP 1225150A1
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EP
European Patent Office
Prior art keywords
transformer
switches
electromagnet
electrical energy
bridge
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Withdrawn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
EP01810020A
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German (de)
French (fr)
Inventor
Antonio Rullo
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Inventio AG
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Inventio AG
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 Inventio AG filed Critical Inventio AG
Priority to EP01810020A priority Critical patent/EP1225150A1/en
Publication of EP1225150A1 publication Critical patent/EP1225150A1/en
Withdrawn legal-status Critical Current

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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
    • B66B1/24—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 invention relates to a device for low noise Operation of an elevator brake by means of a spring force prevents the movement of an elevator car and that by means of an electromagnet acting against the spring force can be ventilated, with electronic switches Electromagnets supply electrical energy.
  • a braking device is known from PCT document WO 97/42118 became known in which the movement of the brake pads is regulated.
  • a computer processes one of the movement and the end position of the brake pads dependent path signal and controls a power unit via an interface, which consists of a first switch, a second switch, a third switch, a fourth switch and one Power source exists.
  • the switches for example Switching transistors are to an H-bridge interconnected, the coil of the electromagnet the Cross branch of the Hs forms. Generated by the interface Ignition signals switch the switches on and off.
  • a pair of switches is inserted in Dependency of a speed / position profile with different long pulses switched on and switched off.
  • the brake pads are made from one Spring force of a spring and electromagnetic force of the Resulting force from the starting position in the Brake position moves, with the brake pads on their way at a higher speed and just before the impact with moving at a low speed.
  • the spring force of the spring by means of the coil supporting magnetic field is generated and the contact between the brake pads and the brake disc immediately manufactured.
  • a disadvantage of the known device is that if the interface or the switch malfunctions safe braking is not guaranteed.
  • the invention seeks to remedy this.
  • the invention as characterized in claim 1, solves the problem to avoid the disadvantages of the known device and propose a braking device with which a quiet and safe braking operation is possible.
  • the advantages achieved by the invention are in essential to see that there is no danger when braking there is the brake because of faulty Electronic components is ventilated. Although none noise-causing contactors for switching the on / off
  • the coil of the brake magnet used meets the braking device according to the invention Safety requirements.
  • the inventive Braking device prevents transmission when braking of electrical energy on the brake magnets. The dangerous and in any case to be avoided condition that the brake can be released accidentally when braking do not enter.
  • Fig. 1 shows a circuit for feeding the Electromagnets (Electromagnetic Brake) not one shown elevator brake, which is by means of a spring force prevents the movement of an elevator car and that by means of of the electromagnet acting against the spring force is ventilated, with electronic switches QA, QB, QC, QD supply electrical energy to the electromagnet.
  • the Switches for example switching transistors, are one H-bridge (full bridge) interconnected, one Transformer T1 forms the cross branch of the Hs. From one Control (Control & PWM) generated ignition signals A, B, C, D switch the switches on and off.
  • Control Control & PWM
  • the switches will be alternating pairs of QA, QD or QB, QC on and turned off, taking electrical energy in the form of a AC voltage from the primary side of the transformer the secondary side of the transformer transmitted and by means of a rectifier B2 is rectified.
  • a rectifier B2 At the Rectifier B2 is the coil of the electromagnet connected.
  • DA, DB, DC, DD diodes protect the switches before switching peaks.
  • a rectifier B1 feeds the bridge with DC voltage, the rectifier is connected to the mains via a fuse F1 (AC Supply) is connected. Connected to the network too the low voltage supply for the Control, whereby a supply (Logic Supply) for the Switching logic and a supply (Driver Supply) for those Driver generating ignition signals is provided. At the The controller is connected to an interface (parameters Settings Interface) for entering control parameters.
  • the driver supply is activated by two relay contacts K1, K2 switched on and off.
  • the relays K1, K2 (low power Relays) are activated by the safety circuit (Brake ON) of the elevator driven. If the safety circuit is open, the The driver supply is interrupted, the switches of the Bridge can not be controlled and no energy to the Electromagnet is supplied.
  • the variant is a half bridge with only two electronic switches QA and QB and with two diodes D1 and D2 are provided.
  • the switches QA, QB are switched on and in simultaneously by means of the ignition signals A, B turned off, taking electrical energy in the form of a AC voltage from the primary side of transformer T1 transferred to the secondary side of transformer T1 and is rectified by means of the diodes D3, D4.
  • the Transformer T1 is with a secondary center tap provided, with the diodes D3 and D4 as rectifiers work.
  • the diodes D1, D2 are used for demagnetization of the transformer T1.

Abstract

Electronic switches (QA,QB,QC,QD) feeding electrical energy to an electromagnet interconnect with a H-bridge (Full Bridge), for which a transformer (T1) forms a shunt arm for the H. Exciting signals (A-D) generated by a controller (Control and PWM) switch the switches on and off alternately in pairs (QA/QD,QB/QC). Electrical energy is transmitted as AC voltage from the transformer's primary side to its secondary side and rectified by a current redresser (B2).

Description

Die Erfindung betrifft eine Einrichtung zum geräuscharmen Betrieb einer Aufzugsbremse, die mittels einer Federkraft die Bewegung einer Aufzugskabine verhindert und die mittels eines entgegen der Federkraft wirkenden Elektromagneten lüftbar ist, wobei elektronische Schalter dem Elektromagneten elektrische Energie zuführen.The invention relates to a device for low noise Operation of an elevator brake by means of a spring force prevents the movement of an elevator car and that by means of an electromagnet acting against the spring force can be ventilated, with electronic switches Electromagnets supply electrical energy.

Aus der PCT Schrift WO 97/42118 ist eine Bremseinrichtung bekannt geworden, bei der die Bewegung der Bremsbeläge geregelt wird. Ein Rechner verarbeitet ein von der Bewegung und der Endlage der Bremsbeläge abhängiges Wegsignal und steuert mittels einer Schnittstelle einen Leistungsteil, der aus einem ersten Schalter, einem zweiten Schalter, einem dritten Schalter, einem vierten Schalter und einer Spannungsquelle besteht. Die Schalter, beispielsweise Schalttransistoren, sind zu einer H-Brücke zusammengeschaltet, wobei die Spule des Elektromagneten den Querzweig des Hs bildet. Von der Schnittstelle erzeugte Zündsignale schalten die Schalter ein und aus.A braking device is known from PCT document WO 97/42118 became known in which the movement of the brake pads is regulated. A computer processes one of the movement and the end position of the brake pads dependent path signal and controls a power unit via an interface, which consists of a first switch, a second switch, a third switch, a fourth switch and one Power source exists. The switches, for example Switching transistors are to an H-bridge interconnected, the coil of the electromagnet the Cross branch of the Hs forms. Generated by the interface Ignition signals switch the switches on and off.

Zum Aktivieren der Bremse, wird je ein Schalterpaar in Abhängigkeit eines Geschwindigkeit/Lage-Profils mit unterschiedlichen langen Pulsen eingeschaltet und ausgeschaltet. Die Bremsbeläge werden von einer aus Federkraft einer Feder und elektromagnetischer Kraft der Spule resultierenden Kraft von der Ausgangslage in die Bremslage bewegt, wobei sich die Bremsbeläge auf ihrem Weg mit höherer Geschwindigkeit und kurz vor dem Aufprall mit einer kleinen Geschwindigkeit bewegen. Bei einem Notstop wird mittels der Spule ein die Federkraft der Feder unterstützendes Magnetfeld erzeugt und der Kontakt zwischen den Bremsbelägen und der Bremsscheibe unverzüglich hergestellt.To activate the brake, a pair of switches is inserted in Dependency of a speed / position profile with different long pulses switched on and switched off. The brake pads are made from one Spring force of a spring and electromagnetic force of the Resulting force from the starting position in the Brake position moves, with the brake pads on their way at a higher speed and just before the impact with moving at a low speed. In the event of an emergency stop is the spring force of the spring by means of the coil supporting magnetic field is generated and the contact between the brake pads and the brake disc immediately manufactured.

Ein Nachteil der bekannten Einrichtung liegt darin, dass bei einem Fehlverhalten der Schnittstelle oder der Schalter ein sicherer Bremsbetrieb nicht gewährleistet ist.A disadvantage of the known device is that if the interface or the switch malfunctions safe braking is not guaranteed.

Hier will die Erfindung Abhilfe schaffen. Die Erfindung, wie sie in Anspruch 1 gekennzeichnet ist, löst die Aufgabe, die Nachteile der bekannten Einrichtung zu vermeiden und eine Bremseinrichtung vorzuschlagen, mit welcher ein geräuscharmer und sicherer Bremsbetrieb möglich ist.The invention seeks to remedy this. The invention, as characterized in claim 1, solves the problem to avoid the disadvantages of the known device and propose a braking device with which a quiet and safe braking operation is possible.

Die durch die Erfindung erreichten Vorteile sind im wesentlichen darin zu sehen, dass im Bremsfall keine Gefahr besteht, dass die Bremse wegen schadhafter Elektronikkomponenten gelüftet wird. Obwohl keine geräuschverursachende Schützen zum Ein-/Aussschalten der Spule des Bremsmagneten verwendet werden, erfüllt die erfindungsgemässe Bremseinrichtung die Sicherheitsanforderungen. Die erfindungsgemässe Bremseinrichtung verhindert im Bremsfall eine Übertragung von elektrischer Energie auf den Bremsmagneten. Der gefährliche und in jedem Fall zu vermeidende Zustand, dass die Bremse im Bremsfall versehentlich gelüftet wird, kann nicht eintreten.The advantages achieved by the invention are in essential to see that there is no danger when braking there is the brake because of faulty Electronic components is ventilated. Although none noise-causing contactors for switching the on / off The coil of the brake magnet used meets the braking device according to the invention Safety requirements. The inventive Braking device prevents transmission when braking of electrical energy on the brake magnets. The dangerous and in any case to be avoided condition that the brake can be released accidentally when braking do not enter.

Anhand der beiliegenden Figuren wird die vorliegende Erfindung näher erläutert.With the help of the attached figures, the present Invention explained in more detail.

Es zeigen:

  • Fig. 1
    einen erfindungsgemässen Schaltkreis zur Speisung eines Elektromagneten einer Aufzugsbremse und
  • Fig. 2 und 3
    eine Ausführungsvariante des Schaltkreises.
    • Show it:
  • Fig. 1
    an inventive circuit for feeding an electromagnet of an elevator brake and
  • 2 and 3
    a variant of the circuit.

    • Fig. 1 zeigt einen Schaltkreis zur Speisung des Elektromagneten (Electromagnetic Brake) einer nicht dargestellten Aufzugsbremse, die mittels einer Federkraft die Bewegung einer Aufzugskabine verhindert und die mittels des entgegen der Federkraft wirkenden Elektromagneten lüftbar ist, wobei elektronische Schalter QA, QB, QC, QD dem Elektromagneten elektrische Energie zuführen. Die Schalter, beispielsweise Schalttransistoren, sind zu einer H-Brücke (Full Bridge) zusammengeschaltet, wobei ein Transformator T1 den Querzweig des Hs bildet. Von einer Steuerung (Control & PWM) erzeugte Zündsignale A, B, C, D schalten die Schalter ein und aus. Die Schalter werden abwechselnd paarweise QA, QD bzw. QB, QC ein- und ausgeschaltet, wobei elektrische Energie in der Form einer Wechselspannung von der Primärseite des Transformators auf die Sekundärseite des Transformators übertragen und mittels eines Gleichrichters B2 gleichgerichtet wird. Am Gleichrichter B2 ist die Spule des Elektromagneten angeschlossen. Dioden DA, DB, DC, DD schützen die Schalter vor Schaltspitzen.Fig. 1 shows a circuit for feeding the Electromagnets (Electromagnetic Brake) not one shown elevator brake, which is by means of a spring force prevents the movement of an elevator car and that by means of of the electromagnet acting against the spring force is ventilated, with electronic switches QA, QB, QC, QD supply electrical energy to the electromagnet. The Switches, for example switching transistors, are one H-bridge (full bridge) interconnected, one Transformer T1 forms the cross branch of the Hs. From one Control (Control & PWM) generated ignition signals A, B, C, D switch the switches on and off. The switches will be alternating pairs of QA, QD or QB, QC on and turned off, taking electrical energy in the form of a AC voltage from the primary side of the transformer the secondary side of the transformer transmitted and by means of a rectifier B2 is rectified. At the Rectifier B2 is the coil of the electromagnet connected. DA, DB, DC, DD diodes protect the switches before switching peaks.

    Ein Gleichrichter B1 speist die Brücke mit Gleichspannung, wobei der Gleichrichter über eine Sicherung F1 ans Netz (AC Supply) angeschlossen ist. Am Netz angeschlossen ist auch die Spannungsversorgung (Low Voltage supply) für die Steuerung, wobei eine Speisung (Logic Supply) für die Schaltlogik und eine Speisung (Driver Supply) für die die Zündsignale erzeugenden Treiber vorgesehen ist. An der Steuerung angeschlossen ist eine Schnittstelle (Parameters Settings Interface) zur Eingabe von Steuerungsparametern. A rectifier B1 feeds the bridge with DC voltage, the rectifier is connected to the mains via a fuse F1 (AC Supply) is connected. Connected to the network too the low voltage supply for the Control, whereby a supply (Logic Supply) for the Switching logic and a supply (Driver Supply) for those Driver generating ignition signals is provided. At the The controller is connected to an interface (parameters Settings Interface) for entering control parameters.

    Die Treiberspeisung wird mittels zwei Relaiskontakten K1, K2 ein- und ausgeschaltet. Die Relais K1, K2 (Low Power Relais) werden vom Sicherheitskreis (Brake ON) des Aufzuges angesteuert. Falls der Sicherheitskreis offen ist, ist die Speisung der Treiber unterbrochen, wobei die Schalter der Brücke nicht angesteuert werden und keine Energie dem Elektromagneten zugeführt wird.The driver supply is activated by two relay contacts K1, K2 switched on and off. The relays K1, K2 (low power Relays) are activated by the safety circuit (Brake ON) of the elevator driven. If the safety circuit is open, the The driver supply is interrupted, the switches of the Bridge can not be controlled and no energy to the Electromagnet is supplied.

    Fig. 2 und 3 zeigen eine Ausführungsvariante des erfindungsgemässen Schaltkreises. Bei dieser Ausführungsvariante ist eine halbe Brücke (Half Bridge) mit lediglich zwei elektronischen Schaltern QA und QB und mit zwei Dioden D1 und D2 vorgesehen. Die Schalter QA, QB werden mittels der Zündsignale A, B gleichzeitig ein- und ausgeschaltet, wobei elektrische Energie in der Form einer Wechselspannung von der Primärseite des Transformators T1 auf die Sekundärseite des Transformators T1 übertragen und mittels der Dioden D3, D4 gleichgerichtet wird. Der Transformator T1 ist mit einer sekundären Mittenanzapfung versehen, wobei die Dioden D3 und D4 als Gleichrichter arbeiten. Die Dioden D1, D2 dienen der Entmagnetisierung des Transformators T1.2 and 3 show an embodiment of the circuit according to the invention. At this The variant is a half bridge with only two electronic switches QA and QB and with two diodes D1 and D2 are provided. The switches QA, QB are switched on and in simultaneously by means of the ignition signals A, B turned off, taking electrical energy in the form of a AC voltage from the primary side of transformer T1 transferred to the secondary side of transformer T1 and is rectified by means of the diodes D3, D4. The Transformer T1 is with a secondary center tap provided, with the diodes D3 and D4 as rectifiers work. The diodes D1, D2 are used for demagnetization of the transformer T1.

    Claims (6)

    Einrichtung zum geräuscharmen Betrieb einer Aufzugsbremse, die mittels einer Federkraft die Bewegung einer Aufzugskabine verhindert und die mittels eines entgegen der Federkraft wirkenden Elektromagneten lüftbar ist, wobei elektronische Schalter dem Elektromagneten elektrische Energie zuführen,
    dadurch gekennzeichnet, dass ein Schaltkreis vorgesehen ist, der im Bremsfall eine Übertragung von elektrischer Energie auf den Elektromagneten verhindert.    Device for low-noise operation of an elevator brake which prevents the movement of an elevator car by means of a spring force and which can be released by means of an electromagnet acting counter to the spring force, electronic switches supplying the electromagnet with electrical energy,
    characterized in that a circuit is provided which prevents transmission of electrical energy to the electromagnet when braking.         Einrichtung nach Anspruch 1,
    dadurch gekennzeichnet, dass zur Übertragung der elektrischen Energie auf den Elektromagneten ein Transformator (T1) vorgesehen ist, wobei die Energie mittels der elektronischen Schalter (QA, QB, QC, QD) dem Transformator (T1) primärseitig zugeführt wird.    Device according to claim 1,
    characterized in that a transformer (T1) is provided for transmitting the electrical energy to the electromagnet, the energy being supplied to the transformer (T1) on the primary side by means of the electronic switches (QA, QB, QC, QD).         Einrichtung nach den Ansprüchen 1 oder 2,
    dadurch gekennzeichnet, dass die elektronischen Schalter (QA, QB, QC, QD) zu einer H-Brücke (Full Bridge) zusammengeschaltet sind, wobei der Transformator (T1) den Querzweig des Hs bildet und eine Steuerung (Control & PWM) Zündsignale (A, B, C, D) erzeugt, die die Schalter (QA, QB, QC, QD) ein- und ausschalten.     Device according to claims 1 or 2,
    characterized in that the electronic switches (QA, QB, QC, QD) are connected together to form an H-bridge (full bridge), the transformer (T1) forming the shunt arm of the Hs and a control (Control & PWM) ignition signals (A , B, C, D) that switch the switches (QA, QB, QC, QD) on and off.         Einrichtung nach den Ansprüchen 1 oder 2,
    dadurch gekennzeichnet, dass die elektronischen Schalter (QA, QB) zu einer halben Brücke (Half Bridge) zusammengeschaltet sind, wobei die Primärseite des Transformators (T1) zwischen zwei Schalter (QA, QB) geschaltet ist und die Sekundärseite des Transformators (T1) eine Mittenanzapfung aufweist und eine Steuerung Zündsignale (A, B) erzeugt, die die Schalter (QA, QB) ein- und ausschalten.    Device according to claims 1 or 2,
    characterized in that the electronic switches (QA, QB) are connected together to form a half bridge, the primary side of the transformer (T1) being connected between two switches (QA, QB) and the secondary side of the transformer (T1) one Has center tap and a control generates ignition signals (A, B) which switch the switches (QA, QB) on and off.         Einrichtung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass die Schalter (QA, QB, QC, QD) mit einer Gleichspannung gespeist sind, wobei die Schalter (QA, QB, QC, QD) die Gleichspannung ein- und ausgeschaltet an die Primärseite des Transformators (T1) legen.    Device according to one of the preceding claims,
    characterized in that the switches (QA, QB, QC, QD) are supplied with a DC voltage, the switches (QA, QB, QC, QD) applying the DC voltage on and off to the primary side of the transformer (T1).         Einrichtung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass zwischen der Sekundärseite des Transformators (T1) und dem Elektromagneten ein Gleichrichter (B2, D3, D4) geschaltet ist, der die vom Transformator (T1) übertragene Energie gleichrichtet.    Device according to one of the preceding claims,
    characterized in that a rectifier (B2, D3, D4) is connected between the secondary side of the transformer (T1) and the electromagnet, which rectifies the energy transmitted by the transformer (T1).
    EP01810020A 2001-01-09 2001-01-09 Device for noiseless operating of elevator brake Withdrawn EP1225150A1 (en)

    Priority Applications (1)

    Application Number Priority Date Filing Date Title
    EP01810020A EP1225150A1 (en) 2001-01-09 2001-01-09 Device for noiseless operating of elevator brake

    Applications Claiming Priority (1)

    Application Number Priority Date Filing Date Title
    EP01810020A EP1225150A1 (en) 2001-01-09 2001-01-09 Device for noiseless operating of elevator brake

    Publications (1)

    Publication Number Publication Date
    EP1225150A1 true EP1225150A1 (en) 2002-07-24

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    EP01810020A Withdrawn EP1225150A1 (en) 2001-01-09 2001-01-09 Device for noiseless operating of elevator brake

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    Cited By (9)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    WO2008135626A1 (en) * 2007-05-02 2008-11-13 Kone Corporation Power supply appliance of a transport system
    EP2096071A1 (en) * 2006-12-20 2009-09-02 Mitsubishi Electric Corporation Solenoid brake control device
    WO2009154591A1 (en) * 2008-06-17 2009-12-23 Otis Elevator Company Safe control of a brake using low power control devices
    CN102190222A (en) * 2010-03-19 2011-09-21 东芝电梯株式会社 Brake control device for elevator
    CN102730499A (en) * 2012-06-29 2012-10-17 上海西艾爱电子有限公司 Elevator contracting brake controller
    CN104210911A (en) * 2014-08-22 2014-12-17 上海吉亿电机有限公司 Turn-off type elevator power supply and realization method of turn-off type elevator power supply
    WO2016091842A1 (en) * 2014-12-09 2016-06-16 Thyssenkrupp Elevator Ag Control system for brakes
    EP3305703A1 (en) * 2016-10-04 2018-04-11 KONE Corporation Elevator brake controller
    EP3457555A1 (en) * 2017-09-19 2019-03-20 KONE Corporation Transport conveyor drive

    Citations (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB2153465A (en) * 1984-01-11 1985-08-21 Hitachi Ltd Emergency stop control apparatus for elevator
    US5717174A (en) * 1996-05-08 1998-02-10 Inventio Ag Elevator brake drop silencing apparatus and method

    Patent Citations (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB2153465A (en) * 1984-01-11 1985-08-21 Hitachi Ltd Emergency stop control apparatus for elevator
    US5717174A (en) * 1996-05-08 1998-02-10 Inventio Ag Elevator brake drop silencing apparatus and method

    Cited By (16)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP2096071A4 (en) * 2006-12-20 2013-07-31 Mitsubishi Electric Corp Solenoid brake control device
    EP2096071A1 (en) * 2006-12-20 2009-09-02 Mitsubishi Electric Corporation Solenoid brake control device
    WO2008135626A1 (en) * 2007-05-02 2008-11-13 Kone Corporation Power supply appliance of a transport system
    US8217617B2 (en) 2007-05-02 2012-07-10 Kone Corporation Power supply appliance of a transport system
    CN101687605B (en) * 2007-05-02 2012-07-18 通力股份公司 Power supply appliance of a transport system
    WO2009154591A1 (en) * 2008-06-17 2009-12-23 Otis Elevator Company Safe control of a brake using low power control devices
    JP2011524319A (en) * 2008-06-17 2011-09-01 オーチス エレベータ カンパニー Safe control of brakes using low-power controllers
    US8585158B2 (en) 2008-06-17 2013-11-19 Otis Elevator Company Safe control of a brake using low power control devices
    CN102190222A (en) * 2010-03-19 2011-09-21 东芝电梯株式会社 Brake control device for elevator
    CN102730499A (en) * 2012-06-29 2012-10-17 上海西艾爱电子有限公司 Elevator contracting brake controller
    CN104210911A (en) * 2014-08-22 2014-12-17 上海吉亿电机有限公司 Turn-off type elevator power supply and realization method of turn-off type elevator power supply
    WO2016091842A1 (en) * 2014-12-09 2016-06-16 Thyssenkrupp Elevator Ag Control system for brakes
    EP3305703A1 (en) * 2016-10-04 2018-04-11 KONE Corporation Elevator brake controller
    US10899579B2 (en) 2016-10-04 2021-01-26 Kone Corporation Elevator brake controller
    EP3457555A1 (en) * 2017-09-19 2019-03-20 KONE Corporation Transport conveyor drive
    US11325808B2 (en) 2017-09-19 2022-05-10 Kone Corporation Transport conveyor drive

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