Rope sway detection and mitigation for elevator system
AssigneeOtis Elevator Company
InventorsBradley Armand Scoville, Sam Wong, William Talbot
Life of this patent
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Abstract
A rope sway detection system of an elevator system includes a magnetic pickup located adjacent to a suspension member of an elevator system. The magnetic pickup is configured to detect a movement of the suspension member via a change in a magnetic field at the magnetic pickup. A signal processing unit is operably connected to the magnetic pickup. The signal processing unit is configured to determine a maximum amplitude of a sway of the suspension member based on the change in the magnetic field, compare the maximum amplitude to a preselected threshold, and signal a change in operation of the elevator system based on an actual or predicted exceedance of the threshold.
Claims20
A rope sway detection system of an elevator system, comprising:
- a magnetic pickup disposed adjacent to a suspension member of an elevator system, the magnetic pickup configured to detect a movement of the suspension member via a change in a magnetic field at the magnetic pickup;
- and
- a signal processing unit operably connected to the magnetic pickup, the signal processing unit configured to:
- determine a maximum amplitude of a sway of the suspension member based on the change in the magnetic field;
- compare the maximum amplitude to a preselected threshold;
- and
- signal a change in operation of the elevator system based on an actual or predicted exceedance of the threshold.
An elevator system comprising:
- a hoistway;
- an elevator car disposed in the hoistway;
- a suspension member operably connected to the elevator car to move the elevator car along the hoistway;
- and
- a rope sway detection system disposed in the hoistway, including:
- a magnetic pickup disposed adjacent to the suspension member, the magnetic pickup configured to detect a movement of the suspension member via a change in a magnetic field at the magnetic pickup;
- and
- a signal processing unit operably connected to the magnetic pickup, the signal processing unit configured to:
- determine a maximum amplitude of a sway of the suspension member based on the change in the magnetic field;
- compare the maximum amplitude to a preselected threshold;
- and
- signal a change in operation of the elevator system based on an actual or predicted exceedance of the threshold.
A method of detecting movement of a suspension member of an elevator system, comprising:
- positioning a magnetic pickup adjacent to the suspension member;
- sensing a change in a magnetic field of the magnetic pickup indicative of movement of the suspension member;
- and
- determining a maximum amplitude of the movement based on the change in the magnetic field.
Dependencies are inferred from the claim text.