EP1154948A1 - Inverter controller for elevator hoist and door motors - Google Patents

Inverter controller for elevator hoist and door motors

Info

Publication number
EP1154948A1
EP1154948A1 EP00919319A EP00919319A EP1154948A1 EP 1154948 A1 EP1154948 A1 EP 1154948A1 EP 00919319 A EP00919319 A EP 00919319A EP 00919319 A EP00919319 A EP 00919319A EP 1154948 A1 EP1154948 A1 EP 1154948A1
Authority
EP
European Patent Office
Prior art keywords
motor
inverter
controller
door
hoist
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
EP00919319A
Other languages
German (de)
French (fr)
Other versions
EP1154948A4 (en
EP1154948B1 (en
Inventor
Masao Iwasa
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.)
Otis Elevator Co
Original Assignee
Otis Elevator Co
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 Co filed Critical Otis Elevator Co
Publication of EP1154948A1 publication Critical patent/EP1154948A1/en
Publication of EP1154948A4 publication Critical patent/EP1154948A4/en
Application granted granted Critical
Publication of EP1154948B1 publication Critical patent/EP1154948B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B13/00—Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
    • B66B13/02—Door or gate operation
    • B66B13/14—Control systems or devices
    • B66B13/143—Control systems or devices 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
    • B66B1/30—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

Definitions

  • This invention involves an elevator in which the elevator hoist motor and the door motor utilize controlled alternating current power.
  • Elevator cars are typically moved by a hoist motor and the car doors are opened and closed by a door motor.
  • the proper voltage and frequency current is provided by a hoist motor inverter to the hoist motor based on instructions from a hoist motor controller, and the proper voltage and frequency current is provided to the door motor by a door motor inverter based on command input from a door motor controller.
  • the hoist motor and the door motor are operated simultaneously to increase a car's operating efficiency. For example, immediately before the car reaches or leaves a floor, the door motor is driven along with the hoist motor. Also, releveling (aligning the floor of the car with the floor at the entrance) may be performed while doors are opened. Thus, while high performance, general-use elevators may require that the hoist motor and the door motor be driven simultaneously to increase operating efficiency, certain home elevator applications do not require high operating efficiency. For such elevators, the need to provide separate hoist motor inverters and door motor inverters has contributed to the cost of the product.
  • this invention is equipped with a hoist motor that moves a car, a door motor that opens and closes the car door or doors, an inverter section that simultaneously controls the voltage and frequency of the current provided to the hoist motor and the door motor, and a control section that sends instructions to this inverter section to control the speed at which the car travels and the speed at which the door opens and closes. It is constituted so that the proper voltage and frequency current will be provided to the hoist motor from the inverter section until the car reaches a floor; and, after the car reaches a floor, the proper voltage and frequency will then be provided to the door motor from the same inverter section.
  • FIG. 1 is a block diagram that shows one application example of an elevator associated with this invention.
  • elevator car 1 is driven in a hoistway (not shown) and includes a horizontally sliding door 5 driven by door operator motor 6.
  • the car 1 is positioned verti- cally by means of a rope 2 attached to the car 1 and suspended from the elevator drive sheave 3 a.
  • the rope 2 terminates at its other end at a counter weight 4 which provides a balancing of the vertical forces on the carl .
  • Drive sheave 3a is rotated by hoist motor 3 which turns an intermediate shaft 3b as shown.
  • Both the hoist motor 3 and the door motor 6 are variable voltage alternating current motors which may be precisely controlled for speed and position by varying the voltage and frequency of the supplied motor current.
  • three phase variable frequency alternating current is supplied to either the hoist motor 3 or the door motor 6 by a controlled inverter section 8 which receives fixed voltage alternating current from a power source 7, such as an electric utility supply line.
  • the voltage and frequency of the output current 11 from the inverter section 8 is controlled in response to the inputs from a controller 9 as shown in the figure.
  • controller 9 causes the elevator hoist motor 3 the cease operation and initiates a signal 22 to a relay control 10 actuating the power relay 12.
  • Power relay 12 is operated, in response to the actuator 10, to switch the output 11 of the inverter section 8 from the hoist motor 3 to the door motor 6.
  • control signals provided to the inverter 8 by the controller 9 will differ in response to the controllers selection of either the hoist motor or the door motor for receiving the inverter output 11.
  • a single inverter 8 and controller 9 may be used to control both a hoist motor 3 and a door motor 6 in an elevator application.
  • Switching relay 11 prevents the simultaneous connection of the hoist motor 3 and the drive motor 6 to the inverter 8.
  • the system according to the present invention thus eliminates the need for a second inverter and controller as is known in the prior art, in exchange for the requirement that the single remaining inverter 8 drive only one of the hoist motor and the door motor at a given time.
  • a controller 9 sensing the misleveling of the elevator with the desired floor, would direct inverter 8 to power door motor 6 so as to close doors 5, then command actuator 10 to actuate the relay 12 so as to connect the inverter 8 to the hoist motor 3 and disconnect inverter 8 from door motor 6.
  • the controller 9 would then control the inverter 8 so as to drive hoist motor 3 to position the elevator car 1 at the correct position within the hoistway.
  • Relay 12 shown here schematically as a mechanical relay having a mechanical actuator 10, may alternatively be an electronic switch or any other device or structure which can divert the output 11 of the inverter section 8 between either the hoist motor 3 or the door motor 6, in response to signal 22 from the controller 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Elevator Door Apparatuses (AREA)
  • Types And Forms Of Lifts (AREA)
  • Elevator Control (AREA)

Abstract

A single inverter (8) provides variable frequency, variable voltage current output (11) to either a hoist motor (3) or a door motor (6), depending on the operating mode of the elevator car (1). A controller (9) provides an input signal (12) to an actuator (10) for switching the output current (11) between the motors (3, 6) by a relay switch (12). The controller (9) includes separate control profiles depending upon which motor (3, 6) is connected to the inverter (8).

Description

INVERTER CONTROLLER FOR ELEVATOR HOIST AND DOOR MOTORS
TECHNICAL FIELD This invention involves an elevator in which the elevator hoist motor and the door motor utilize controlled alternating current power.
BACKGROUND
Elevator cars are typically moved by a hoist motor and the car doors are opened and closed by a door motor. The proper voltage and frequency current is provided by a hoist motor inverter to the hoist motor based on instructions from a hoist motor controller, and the proper voltage and frequency current is provided to the door motor by a door motor inverter based on command input from a door motor controller.
There are instances where the hoist motor and the door motor are operated simultaneously to increase a car's operating efficiency. For example, immediately before the car reaches or leaves a floor, the door motor is driven along with the hoist motor. Also, releveling (aligning the floor of the car with the floor at the entrance) may be performed while doors are opened. Thus, while high performance, general-use elevators may require that the hoist motor and the door motor be driven simultaneously to increase operating efficiency, certain home elevator applications do not require high operating efficiency. For such elevators, the need to provide separate hoist motor inverters and door motor inverters has contributed to the cost of the product.
What is needed is a means for decreasing the overall cost of a home elevator, or the like.
SUMMARY OF THE INVENTION In order to accomplish this purpose, this invention is equipped with a hoist motor that moves a car, a door motor that opens and closes the car door or doors, an inverter section that simultaneously controls the voltage and frequency of the current provided to the hoist motor and the door motor, and a control section that sends instructions to this inverter section to control the speed at which the car travels and the speed at which the door opens and closes. It is constituted so that the proper voltage and frequency current will be provided to the hoist motor from the inverter section until the car reaches a floor; and, after the car reaches a floor, the proper voltage and frequency will then be provided to the door motor from the same inverter section. BRIEF DESCRIPTION OF THE FIGURES
Figure 1 is a block diagram that shows one application example of an elevator associated with this invention.
DETAILED DESCRIPTION
Referring to Figure 1 , elevator car 1 is driven in a hoistway (not shown) and includes a horizontally sliding door 5 driven by door operator motor 6. The car 1 is positioned verti- cally by means of a rope 2 attached to the car 1 and suspended from the elevator drive sheave 3 a. The rope 2 terminates at its other end at a counter weight 4 which provides a balancing of the vertical forces on the carl . Drive sheave 3a is rotated by hoist motor 3 which turns an intermediate shaft 3b as shown.
Both the hoist motor 3 and the door motor 6 are variable voltage alternating current motors which may be precisely controlled for speed and position by varying the voltage and frequency of the supplied motor current.
According to the present invention, three phase variable frequency alternating current is supplied to either the hoist motor 3 or the door motor 6 by a controlled inverter section 8 which receives fixed voltage alternating current from a power source 7, such as an electric utility supply line. The voltage and frequency of the output current 11 from the inverter section 8 is controlled in response to the inputs from a controller 9 as shown in the figure.
During vertical movement of the elevator carl, doors 5 are closed and the inverter section 8 supplies variable frequency and voltage current to the hoist motor 3, only. The speed and position of the car 1 are controlled by the controller 9 so as to precisely deliver the elevator car, and its passengers, to the desired floor in the building served by the elevator. Upon arriving at the desired floor level, controller door 9 causes the elevator hoist motor 3 the cease operation and initiates a signal 22 to a relay control 10 actuating the power relay 12. Power relay 12 is operated, in response to the actuator 10, to switch the output 11 of the inverter section 8 from the hoist motor 3 to the door motor 6. After the inverter 8 is con- nected to the door motor 6, controller 9, using a completely different velocity profile, drives the door motor 6 to open the doors to permit ingress and egress of the passengers to the elevator car 1.
It would be appreciated by those skilled in the art that the control signals provided to the inverter 8 by the controller 9 will differ in response to the controllers selection of either the hoist motor or the door motor for receiving the inverter output 11. Thus, a single inverter 8 and controller 9 may be used to control both a hoist motor 3 and a door motor 6 in an elevator application. Switching relay 11 prevents the simultaneous connection of the hoist motor 3 and the drive motor 6 to the inverter 8. The system according to the present invention thus eliminates the need for a second inverter and controller as is known in the prior art, in exchange for the requirement that the single remaining inverter 8 drive only one of the hoist motor and the door motor at a given time. In the event the elevator car were to become misleveled during a period of time in which the door motor 6 was in operation or the doors 5 in an open position, a controller 9, sensing the misleveling of the elevator with the desired floor, would direct inverter 8 to power door motor 6 so as to close doors 5, then command actuator 10 to actuate the relay 12 so as to connect the inverter 8 to the hoist motor 3 and disconnect inverter 8 from door motor 6. The controller 9 would then control the inverter 8 so as to drive hoist motor 3 to position the elevator car 1 at the correct position within the hoistway.
Relay 12, shown here schematically as a mechanical relay having a mechanical actuator 10, may alternatively be an electronic switch or any other device or structure which can divert the output 11 of the inverter section 8 between either the hoist motor 3 or the door motor 6, in response to signal 22 from the controller 9.

Claims

WHAT IS CLAIMED IS:
1. Means for providing variable frequency alternating current for driving an ele- vator hoist motor and an elevator door motor, comprising : a single inverter section for receiving alternating current from a supply source and de- livering variable frequency, variable voltage driving current in response to a control signal received from a controller; means for switching the variable frequency, variable voltage current delivered by the inverter between the hoist motor or the drive motor; and means, responsive to a second signal from the controller for causing said switch means to connect the inverter output to either the hoist motor or the door motor individually.
2. The power supply means as recited in Claim 1 , wherein the controller includes a first control profile for use only when the inverter output is connected to the hoist motor, and a second control profile for use only when the inverter output is connected to the door motor.
EP00919319A 1999-02-26 2000-02-18 Inverter controller for elevator hoist and door motors Expired - Lifetime EP1154948B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP5100899 1999-02-26
JP11051008A JP2000247553A (en) 1999-02-26 1999-02-26 Elevator
PCT/US2000/004119 WO2000050329A1 (en) 1999-02-26 2000-02-18 Inverter controller for elevator hoist and door motors

Publications (3)

Publication Number Publication Date
EP1154948A1 true EP1154948A1 (en) 2001-11-21
EP1154948A4 EP1154948A4 (en) 2002-10-30
EP1154948B1 EP1154948B1 (en) 2004-05-12

Family

ID=12874759

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00919319A Expired - Lifetime EP1154948B1 (en) 1999-02-26 2000-02-18 Inverter controller for elevator hoist and door motors

Country Status (6)

Country Link
EP (1) EP1154948B1 (en)
JP (1) JP2000247553A (en)
CN (1) CN1241812C (en)
DE (1) DE60010668T2 (en)
ES (1) ES2220453T3 (en)
WO (1) WO2000050329A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1370482A1 (en) * 2001-03-05 2003-12-17 Manfred Schrödl Electric drive
CN102241356A (en) * 2011-06-28 2011-11-16 杭州优迈科技有限公司 Energy saving method and device for elevator door motor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04191263A (en) * 1990-11-27 1992-07-09 Mitsubishi Electric Corp Elevator controller
JPH06153571A (en) * 1992-10-29 1994-05-31 Toshiba Corp Container crane controller
US6002218A (en) * 1992-11-20 1999-12-14 Fujitsu General Limited Control device for air conditioner
US5361565A (en) * 1993-01-19 1994-11-08 Bayer Robert F Elevating system
JP3324932B2 (en) * 1996-06-05 2002-09-17 株式会社東芝 Elevator control device
US5936375A (en) * 1997-11-05 1999-08-10 Paceco Corp. Method for energy storage for load hoisting machinery

Also Published As

Publication number Publication date
DE60010668T2 (en) 2004-10-07
DE60010668D1 (en) 2004-06-17
EP1154948A4 (en) 2002-10-30
ES2220453T3 (en) 2004-12-16
JP2000247553A (en) 2000-09-12
WO2000050329A1 (en) 2000-08-31
CN1341074A (en) 2002-03-20
CN1241812C (en) 2006-02-15
EP1154948B1 (en) 2004-05-12

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