METHOD FOR LIMITING THE LOADING OF AN ELEVATOR ASSEMBLY, AND AN ELEVATOR ASSEMBLY

• US 20130075199A1
• Filed: 11/19/2012
• Published: 03/28/2013
• Est. Priority Date: 05/25/2010
• Status: Active Grant

• Current Assignee: Kone Corporation
• Original Assignee: Tomi Sipila, Tuukka Kauppinen
• Inventors: KAUPPINEN, Tuukka, MODEEN, Joakim, SIPIL, Tomi
• Granted Patent: US 8,985,280 B2
• Time in Patent Office: Days
• US Class Current: 187/247
• CPC Class Codes: B66B 1/28 electrical detecting excessive speed B66B5/04 ; control of electrical motor H02P
• CPC Class Codes: B66B 1/285 with the use of a speed pattern generator
• CPC Class Codes: B66B 1/30 effective on driving gear , e.g. acting on power electronics, on inverter or rectifier controlled motor
• CPC Class Codes: B66B 1/308 with AC powered elevator drive
• CPC Class Codes: Y02B 50/00 Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies

Abstract

The invention relates to a method for limiting the loading of an elevator assembly, and also to an elevator assembly.

Claims

1. Method for limiting the loading of an elevator assembly, wherein

a plurality of optional operational objectives are determined for the elevator traffic

one or more of these is selected at a time to be implemented as an operational objective of the elevator traffic using selection criteria of the operational objective

a movement profile of the elevator car is formed on the basis of one or more selected operational objectives

wherein:

a limit value for the maximum permitted loading is set for one or more parts of the elevator assembly

the loading of the aforementioned one or more parts of the elevator assembly is determined, and

if it is deduced that the loading of the aforementioned one or more parts of the elevator assembly exceeds the limit value for the maximum permitted loading, the loading of the one or more parts in question of the elevator assembly is limited by modifying the value of the movement magnitude of the elevator car in the movement profile of the elevator car.

2. Method according to claim 1, wherein:

a physical magnitude affecting the loading of the aforementioned one or more parts of the elevator assembly is measured and

the loading of the aforementioned one or more parts of the elevator assembly is determined on the basis of the measured physical magnitude affecting the loading of one or more parts of the elevator assembly.

3. Method according to claim 1, wherein one aforementioned part of an elevator assembly is the end buffer of the elevator hoistway, and in that the limit value for the maximum permitted loading of the end buffer of the elevator hoistway is the maximum permitted meeting speed of the elevator car and/or the counterweight and the end buffer of the elevator hoistway.

4. Method according to claim 3, wherein the physical magnitude affecting the loading of the end buffer is the speed of the elevator car and/or counterweight.

5. Method according to claim 1, wherein one part of the elevator assembly is the electric drive of the elevator.

6. Method according to claim 5, wherein the electric drive of the elevator comprises an alternating current motor and also a frequency converter for supplying current to the alternating current motor.

7. Method according to claim 1, wherein one part of an elevator assembly is the electrical interface of the elevator assembly.

8. Method according to claim 7, wherein the physical magnitude affecting the loading of one or more parts of the elevator assembly is the net current produced in the electrical interface from the operation of the elevator assembly.

9. Method according to claim 2 wherein:

one physical magnitude affecting the loading of one or more parts of the elevator assembly is the temperature of the air of the elevator hoistway.

10. Method according to claim 2, wherein one physical magnitude affecting the loading of one or more parts of the elevator assembly is the load of the elevator car.

11. Elevator assembly, which comprises:

an elevator car;

an electric drive for moving the elevator car according to a movement profile to be determined for the movement of the elevator car;

a control apparatus, which is arranged;

to determine a plurality of optional operational objectives for the elevator traffic,

to select one or more of these at a time to be implemented as an operational objective of the elevator traffic using selection criteria of the operational objective,

to form a movement profile of the elevator car on the basis of one or more selected operational objectives,

wherein the control apparatus is arranged;

to set a limit value for the maximum permitted loading for one or more parts of the elevator assembly,

to determine the loading of the aforementioned one or more parts of the elevator assembly, and

when it deduces that the loading of the aforementioned one or more parts of the elevator assembly exceeds the limit value for the maximum permitted loading, the control apparatus is arranged to limit the loading of the one or more parts in question of the elevator assembly by modifying the value of the movement magnitude of the elevator car in the movement profile of the elevator car.

12. Elevator assembly according to claim 11, wherein the control apparatus is arranged to limit the loading exerted on the end buffer by reducing the maximum speed of the elevator car in the movement profile of the elevator car stopping at the terminal floor in relation to the maximum speed according to the movement profile of an elevator car stopping elsewhere than at the terminal floor.

13. Elevator assembly according to claim 11, wherein the control apparatus is arranged to reduce the value of the acceleration and/or deceleration and/or maximum speed of an elevator car in the movement profile of the elevator car when the temperature of the air of the elevator hoistway reaches the limit value for maximum permitted temperature.

14. Elevator assembly according to claim 11, wherein the physical magnitude affecting the loading of one or more parts of the elevator assembly is the power flow occurring via one or more parts of the elevator assembly, and in that the control apparatus is arranged to limit the net current produced in the electrical interface from the operation of the elevator assembly by modifying the value of the movement magnitude of the elevator car in the movement profile of the elevator car when it deduces that the flow of net power occurring via one or more parts of the elevator assembly exceeds the limit value for the maximum permitted net power.

15. Elevator assembly according to claims 11, wherein the elevator assembly comprises an energy storage, which is arranged in a first operating situation to yield electrical energy for moving the elevator car, and in a second operating situation to receive electrical energy released by movement of the elevator car, and in that the control apparatus is arranged to limit the net current produced in the electrical interface of the elevator assembly from the operation of the elevator assembly by modifying the value of the movement magnitude of the elevator car in the movement profile of the elevator car on the basis of the charge state of the energy storage.