Elevator electrical safety actuator control

Patent metadata

Field	Value
Publication number	US-11267677-B2
Application number	US-201916552354-A
Country	US
Kind code	B2
Filing date	Aug 27, 2019
Priority date	Aug 30, 2018
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

Elevator systems and methods are provided. The systems include a traveling component movable along a guide rail within an elevator shaft, an elevator machine operably connected to the traveling component and including a machine brake, and an overspeed safety system. The overspeed safety system includes a safety brake and an electromechanical actuator, the brake engageable with the guide rail. A safety system controller operably connects to the electromechanical actuator and triggers the electromechanical actuator due to at least a detected triggering event. A temporary power supply is operably connected to the overspeed safety system to provide power in the event of a power failure.

First claim

What is claimed is:

1. An elevator system comprising:
a traveling component movable along a guide rail within an elevator shaft;
an elevator machine operably connected to the traveling component by one or more tension members, the elevator machine including a machine brake for stopping movement of the traveling component; and
an overspeed safety system comprising:
a safety brake and an electromechanical actuator operably connected thereto, wherein the safety brake is operable to engage with the guide rail to stop movement of the traveling component;
a safety system controller operably connected to the electromechanical actuator, the control system configured to trigger the electromechanical actuator due to at least a detected triggering event; and
a temporary power supply operably connected to the overspeed safety system;
wherein, during a power failure to the overspeed safety system, the temporary power supply supplies power to the overspeed safety system for a safety duration to prevent actuation of the safety brake and the elevator machine stops the traveling component within the elevator shaft, wherein the safety duration is a period of time that is longer than the maximum amount of time for the machine brake to stop the traveling component under normal operational circumstances, and
wherein the safety system controller is configured to transition the electromechanical actuator from a first state to a second state, wherein in the second state, if the traveling component travels downward, the downward movement of the traveling component within the elevator shaft engages the safety brake with the guide rail to stop the downward movement of the traveling component.

2. The elevator system of claim 1 , wherein the electromechanical actuator comprises:
a first magnetic element; and
a second magnetic element,
wherein the first magnetic element is configured to retain the second magnetic element thereto, and when the second magnetic element is not retained by the first magnetic element the second magnetic element is engageable with the guide rail.

3. The elevator system of claim 2 , wherein when the second magnetic element is engaged with the guide rail, downward movement of the traveling component causes the safety brake to engage with the guide rail.

4. The elevator system of claim 3 , wherein the first magnetic element is an electromagnetic coil and the second magnetic element is a permanent magnet.

5. The elevator system of claim 2 , wherein the first magnetic element is an electromagnetic coil and the second magnetic element is a permanent magnet.

6. The elevator system of claim 2 , wherein the safety duration is at least 3 seconds.

7. The elevator system of claim 1 , further comprising:
an elevator controller; and
a communication bus operably connecting the safety system controller with the elevator controller,
wherein detection of the power failure is transmitted from the elevator controller to the safety system controller over the communication bus.

8. The elevator system of claim 7 , wherein the safety duration is at least 3 seconds.

9. The elevator system of claim 7 , further comprising an additional guide rail, an additional safety brake, and an additional electromechanical actuator operably connected thereto, wherein the additional safety brake is simultaneously operable with the safety brake to engage with the additional guide rail to stop movement of the traveling component.

10. The elevator system of claim 7 , wherein the traveling component is one of an elevator car and a counterweight.

11. The elevator system of claim 1 , wherein the safety duration is at least 3 seconds.

12. The elevator system of claim 1 , wherein, at the end of the safety duration, the second magnetic element is transitioned to the second state.

13. The elevator system of claim 1 , further comprising an additional guide rail, an additional safety brake, and an additional electromechanical actuator operably connected thereto, wherein the additional safety brake is simultaneously operable with the safety brake to engage with the additional guide rail to stop movement of the traveling component.

14. The elevator system of claim 1 , wherein the traveling component is one of an elevator car and a counterweight.

15. A method for controlling operation of an elevator system, the method comprising:
detecting a power failure;
supplying power from a temporary power supply to an overspeed safety system for a safety duration to prevent actuation of a safety brake of the overspeed safety system, wherein the safety duration is a period of time that is longer than a maximum amount of time for a machine brake to stop a traveling component under normal operational circumstances;
applying the machine brake to stop movement of the traveling component; and
transitioning an overspeed safety system from a first state to a second state, wherein in the second state, further downward movement of the traveling component within an elevator shaft engages the safety brake of the overspeed safety system with a guide rail to stop the downward movement of the traveling component.

16. The method of claim 15 , wherein the safety duration is at least 3 seconds.

17. The method of claim 15 , wherein, at the end of the safety duration, the second magnetic elements are transitioned to the second state.

18. The method of claim 15 , further comprising transmitting information regarding a power failure from an elevator controller to the overspeed safety system over a communication bus.

19. The method of claim 15 , further comprising, when power is restored, transitioning the overspeed safety system from the second state to the first state and resuming normal operation of the traveling component.

Assignees

• Otis Elevator Co

Inventors

• Ruhnke Jan
• Krambeck Helge

Classifications

• B66B5/16 Primary

  Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well · CPC title

• B66B1/3461

  between the elevator control system and remote or mobile stations · CPC title

• B66B5/22 Primary

  by means of linearly-movable wedges (B66B5/24 takes precedence) · CPC title

• B66B9/00

  Kinds or types of lifts in, or associated with, buildings or other structures (characterised by control systems B66B1/00; apparatus for raising or lowering persons on stages of theatres A63J5/12) · CPC title

• B66B1/36

  Means for stopping the cars, cages, or skips at predetermined levels · CPC title