EP0703182A2 - Energy saving device for an elevator - Google Patents

Energy saving device for an elevator Download PDF

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Publication number
EP0703182A2
EP0703182A2 EP95114463A EP95114463A EP0703182A2 EP 0703182 A2 EP0703182 A2 EP 0703182A2 EP 95114463 A EP95114463 A EP 95114463A EP 95114463 A EP95114463 A EP 95114463A EP 0703182 A2 EP0703182 A2 EP 0703182A2
Authority
EP
European Patent Office
Prior art keywords
elevator
battery
energy
direct voltage
converter
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
EP95114463A
Other languages
German (de)
French (fr)
Other versions
EP0703182A3 (en
EP0703182B1 (en
Inventor
Matti KÄHKIPURO
Pekka Jahkonen
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.)
Kone Corp
Original Assignee
Kone 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 Kone Corp filed Critical Kone Corp
Publication of EP0703182A2 publication Critical patent/EP0703182A2/en
Publication of EP0703182A3 publication Critical patent/EP0703182A3/en
Application granted granted Critical
Publication of EP0703182B1 publication Critical patent/EP0703182B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B66B1/30—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical effective on driving gear, e.g. acting on power electronics, on inverter or rectifier controlled motor
    • B66B1/302—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical effective on driving gear, e.g. acting on power electronics, on inverter or rectifier controlled motor for energy saving
    • 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
    • B66B1/30—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical effective on driving gear, e.g. acting on power electronics, on inverter or rectifier controlled motor
    • B66B1/308—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical effective on driving gear, e.g. acting on power electronics, on inverter or rectifier controlled motor with AC powered elevator drive

Definitions

  • the present invention relates to a system as defined in the preamble of claim 1 for saving energy in an elevator.
  • a three-phase mains voltage is applied to a frequency converter 15 consisting of a rectifier 3, an inverter bridge 2 and an intermediate circuit 4,10,11 connected between these.
  • a frequency converter 15 consisting of a rectifier 3, an inverter bridge 2 and an intermediate circuit 4,10,11 connected between these.
  • the inverter bridge 2 converts the alternating voltage supplied by the drive motor 1 into a direct voltage, which is applied to the conductors 10 and 11 of the intermediate circuit 4,10,11.
  • a direct voltage converter 5 a battery 6 is charged with this voltage. In the solution of the invention, only one battery 6 is needed.
  • the power generated by the braking operation in frequency converter driven elevators (the voltage is about 650V and the current 1...3 A) is converted by means of a chopper type direct voltage converter 5 to a level of approx. 30V / 20...50A, which is well suited as a power source for an elevator and for the charging of 24V batteries.
  • 'Chopper type converter' means a transformer implemented using semiconductors and small-size ferrite core transformers which has an efficiency comparable to that of a transformer but which provides a better degree of regulation.
  • the same direct voltage converter 5 is used to supply power to the whole control system.
  • the direct voltage converter 5 can be used to produce a raised voltage for the elevator's safety circuit, which consists of door contactors and other safety switches and prevents the elevator from starting when the doors are open or it is otherwise hazardous to set the elevator in motion.
  • the elevator acts as an energy source, charging the battery 6 with a large current of 20...50A, and during approx. 80% of the time the the energy stored in the battery 6 is used to supply power to the control equipment of the elevator, the control system, the brake and the signalling etc. Energy is supplied e.g. to the elevator control unit, identified by number 7 in the figure. This control unit needs a significant amount of electric energy.
  • the brake 8 of the elevator refers in the first place to the braking electromagnet, which also consumes quite a deal of energy
  • elevator lighting 9 refers in the first place to the car light, which generally requires a battery as a reserve power source.
  • the capacitor 4 reduces high-frequency noise passed to the mains network.
  • the energy generated during braking is converted to a lower voltage and supplied to elevator equipment as specified above and to the battery 6.
  • operation is almost the same as above but the power is taken from the electric network.
  • the transmission of braking energy into the battery 6 is controlled by adjusting the voltage to a suitable level. Voltage control also ensures that the battery 6 has a sufficient voltage.
  • Another feature of the invention is that it integrates the power sources of the elevator's drive and control systems into a single whole. So far, these have been separate from each other, which has caused additional expenses and problems relating to quality and disturbances.
  • reserve power operation of the elevator can be implemented so as to allow the elevator to be driven at a reduced speed for a few hours.

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

Abstract

The invention relates to a system for the supply of energy in an elevator, in which system the elevator motor (1) is fed by a frequency converter (15) comprising a rectifier (3), an inverter bridge (2) and an intermediate circuit (4,10,11) between them. A direct voltage converter (5) is used to convert a large intermediate voltage to a level suitable for a battery (6) and the elevator's braking energy is supplied into the battery (6). The battery (6) is connected to supply power to other elevator equipment (7,8,9) except the drive motor (1).

Description

  • The present invention relates to a system as defined in the preamble of claim 1 for saving energy in an elevator.
  • In normal volume elevators, there have not been any energy saving systems so far, but the elevator's braking energy has been dissipated in a brake resistor. At present, the standard solution is to use a frequency converter drive that passes the braking energy to a resistor. This system is relatively expensive and it involves problems relating to quality and disturbances. To provide a solution to the problem and to eliminate the drawbacks mentioned, a new type of a system for saving energy in an elevator is presented as an invention. The system of the invention is characterized by what is presented in the characterization part of claim 1. Other embodiments of the invention are characterized by the features presented in the other claims.
  • The invention allows the following advantages to be achieved:
    • The system is cheaper ad less disturbance-prone than a frequency converter that returns braking energy into the mains network
    • Reserve power operation can be implemented without significant expenses
    • Lighting, signalling and remote supervision can remain operative during a power failure
    • A saving of about 20...30 % on energy is achieved in a geared elevator and about 50...60 % in a gearless one as compared to a frequency converter drive that returns braking energy into the mains network, which is currently the standard solution
    • Eliminates the problems associated with returning energy into the mains network
    • Improved efficiency
    In the following, the invention is described in detail by the aid of an example by referring to the attached drawing, in which
    • Fig. 1 presents a simplified circuit as provided by the invention.
  • In Fig. 1, a three-phase mains voltage is applied to a frequency converter 15 consisting of a rectifier 3, an inverter bridge 2 and an intermediate circuit 4,10,11 connected between these. When the elevator is travelling in the low-load direction, meaning that an empty car is going upwards while the counterweight is going downwards, electricity is supplied between the conductors 10,11 of the intermediate voltage circuit 4,10,11 from the drive motor 1, which is operating as a generator. The inverter bridge 2 converts the alternating voltage supplied by the drive motor 1 into a direct voltage, which is applied to the conductors 10 and 11 of the intermediate circuit 4,10,11. Using a direct voltage converter 5, a battery 6 is charged with this voltage. In the solution of the invention, only one battery 6 is needed. The power generated by the braking operation in frequency converter driven elevators (the voltage is about 650V and the current 1...3 A) is converted by means of a chopper type direct voltage converter 5 to a level of approx. 30V / 20...50A, which is well suited as a power source for an elevator and for the charging of 24V batteries. 'Chopper type converter' means a transformer implemented using semiconductors and small-size ferrite core transformers which has an efficiency comparable to that of a transformer but which provides a better degree of regulation. The same direct voltage converter 5 is used to supply power to the whole control system.
  • The direct voltage converter 5 can be used to produce a raised voltage for the elevator's safety circuit, which consists of door contactors and other safety switches and prevents the elevator from starting when the doors are open or it is otherwise hazardous to set the elevator in motion. During approx. 20% of the travelling time, the elevator acts as an energy source, charging the battery 6 with a large current of 20...50A, and during approx. 80% of the time the the energy stored in the battery 6 is used to supply power to the control equipment of the elevator, the control system, the brake and the signalling etc. Energy is supplied e.g. to the elevator control unit, identified by number 7 in the figure. This control unit needs a significant amount of electric energy. The brake 8 of the elevator refers in the first place to the braking electromagnet, which also consumes quite a deal of energy, and elevator lighting 9 refers in the first place to the car light, which generally requires a battery as a reserve power source. The capacitor 4 reduces high-frequency noise passed to the mains network.
  • The energy generated during braking is converted to a lower voltage and supplied to elevator equipment as specified above and to the battery 6. When no braking is done, operation is almost the same as above but the power is taken from the electric network. The transmission of braking energy into the battery 6 is controlled by adjusting the voltage to a suitable level. Voltage control also ensures that the battery 6 has a sufficient voltage.
  • Another feature of the invention is that it integrates the power sources of the elevator's drive and control systems into a single whole. So far, these have been separate from each other, which has caused additional expenses and problems relating to quality and disturbances. Using a two-way converter, reserve power operation of the elevator can be implemented so as to allow the elevator to be driven at a reduced speed for a few hours.
  • It is obvious to the person skilled in the art that different embodiments of the invention are not restricted to the examples described above, but that they may be varied within the limits defined by the following claims.

Claims (4)

  1. System for the supply of energy in an elevator, in which system the elevator drive motor (1) is fed by a frequency converter (15) comprising a rectifier (3), an inverter bridge (2) and an intermediate circuit (4,10,11) between them, characterized in that
    - a direct voltage converter (5) is used to convert a large intermediate voltage to a level suitable for a battery (6) and
    - the elevator's braking energy is supplied into the battery (6) and
    - the battery (6) is connected to supply power to other elevator equipment (7,8,9) except the drive motor (1).
  2. System according to claim 1, characterized in that the direct voltage converter (5) is used for the supply of power to the whole control system.
  3. System according to claim 2, characterized in that the direct voltage converter (5) is used to produce a raised voltage for the safety circuit.
  4. System according to any one of the preceding claims, characterized in that the power sources for the drive and control systems are integrated into a single whole.
EP95114463A 1994-09-16 1995-09-14 Energy saving device for an elevator Expired - Lifetime EP0703182B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI944295 1994-09-16
FI944295A FI112008B (en) 1994-09-16 1994-09-16 Elevator energy saving device

Publications (3)

Publication Number Publication Date
EP0703182A2 true EP0703182A2 (en) 1996-03-27
EP0703182A3 EP0703182A3 (en) 1996-12-04
EP0703182B1 EP0703182B1 (en) 2001-04-04

Family

ID=8541384

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95114463A Expired - Lifetime EP0703182B1 (en) 1994-09-16 1995-09-14 Energy saving device for an elevator

Country Status (4)

Country Link
EP (1) EP0703182B1 (en)
JP (1) JPH08169653A (en)
DE (1) DE69520533T2 (en)
FI (1) FI112008B (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0850868A1 (en) * 1996-12-31 1998-07-01 Inventio Ag Controlled emergency stop apparatus for elevator
ES2299310A1 (en) * 2005-09-22 2008-05-16 David Illescas Romero System for automatic accumulation of energy for engines, inductive circuits and electrical circuits, has battery system feeding frequency converter and motor, which closes circuit and motor is fed to frequency converter
WO2008155445A1 (en) * 2007-06-20 2008-12-24 Kone Corporation Power control of transport system
CN101976833A (en) * 2010-10-31 2011-02-16 华南理工大学 System and method for monitoring and managing electric energy of elevator group
EP2597061A1 (en) * 2011-11-22 2013-05-29 Industrial de Elevacion, S.A. Energy saving system for direct current elevators
US8714286B2 (en) 2009-12-28 2014-05-06 Sandvik Mining And Construction Oy Mining vehicle and method for its energy supply
EP2738130A1 (en) * 2012-11-30 2014-06-04 Aufzugswerke Schmitt & Sohn GmbH & Co. KG Lift assembly
US8955657B2 (en) 2009-12-28 2015-02-17 Sandvik Mining And Construction Oy Mining vehicle and method for its energy supply
CN109088737A (en) * 2017-06-14 2018-12-25 上海华为技术有限公司 A kind of oil machine power-economizing method, relevant device and system
CN113224808A (en) * 2021-04-14 2021-08-06 钟亮 Novel elevator energy-saving device based on super capacitor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1121035A (en) * 1997-07-04 1999-01-26 Toshiba Corp Elevator device
JP4262960B2 (en) * 2002-10-11 2009-05-13 東芝エレベータ株式会社 Elevator lighting equipment
DE102008002839A1 (en) 2007-05-08 2008-12-18 Karl-Ludwig Blocher Energy using method for use in e.g. electrical supply network, involves remote-controlling lift systems from central control station via global system for mobile communication mobile radio, or control and announcement network
EP3590879A1 (en) * 2018-07-04 2020-01-08 KONE Corporation Elevator brake controller with earth fault detection

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5836867A (en) * 1981-08-25 1983-03-03 三菱電機株式会社 Operating device in case of emergency of alternating current elevator
JPS59203072A (en) * 1983-05-04 1984-11-17 三菱電機株式会社 Controller for alternating current elevator
JPH05294568A (en) * 1992-04-22 1993-11-09 Hitachi Ltd Power supply device for elevator cage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0850868A1 (en) * 1996-12-31 1998-07-01 Inventio Ag Controlled emergency stop apparatus for elevator
US5893432A (en) * 1996-12-31 1999-04-13 Inventio Ag Controlled emergency stop apparatus for elevators
ES2299310A1 (en) * 2005-09-22 2008-05-16 David Illescas Romero System for automatic accumulation of energy for engines, inductive circuits and electrical circuits, has battery system feeding frequency converter and motor, which closes circuit and motor is fed to frequency converter
WO2008155445A1 (en) * 2007-06-20 2008-12-24 Kone Corporation Power control of transport system
US8053931B2 (en) 2007-06-20 2011-11-08 Kone Corporation Power control of transport system
US8714286B2 (en) 2009-12-28 2014-05-06 Sandvik Mining And Construction Oy Mining vehicle and method for its energy supply
US8955657B2 (en) 2009-12-28 2015-02-17 Sandvik Mining And Construction Oy Mining vehicle and method for its energy supply
CN101976833A (en) * 2010-10-31 2011-02-16 华南理工大学 System and method for monitoring and managing electric energy of elevator group
EP2597061A1 (en) * 2011-11-22 2013-05-29 Industrial de Elevacion, S.A. Energy saving system for direct current elevators
EP2738130A1 (en) * 2012-11-30 2014-06-04 Aufzugswerke Schmitt & Sohn GmbH & Co. KG Lift assembly
CN109088737A (en) * 2017-06-14 2018-12-25 上海华为技术有限公司 A kind of oil machine power-economizing method, relevant device and system
CN113224808A (en) * 2021-04-14 2021-08-06 钟亮 Novel elevator energy-saving device based on super capacitor

Also Published As

Publication number Publication date
FI944295A (en) 1996-03-17
FI944295A0 (en) 1994-09-16
JPH08169653A (en) 1996-07-02
EP0703182A3 (en) 1996-12-04
FI112008B (en) 2003-10-15
EP0703182B1 (en) 2001-04-04
DE69520533D1 (en) 2001-05-10
DE69520533T2 (en) 2001-07-12

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