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US 9,862,571 B2Granted
Elevator cord health monitoring
AssigneeOtis Elevator Company
InventorsFanping Sun, Xiaodong Luo, Daniel A. Mosher, Huan Zhang, John P. Wesson, Yan Chen, Mark Steven Thompson, Raja Kountanya, Richard N. Fargo
Life of this patent
Estimating the term…
Abstract
A method of fault detection of a belt or rope includes interconnecting a plurality of cords of the belt or rope, the cords including a plurality of wires, to form a bridge circuit. A fault detection bridge circuit is subjected to a voltage excitation and outputs a voltage which is indicative of the belt or rope damage but remaining insensitive to other environmental noises.
Claims21
A method of fault detection of a belt or rope comprising:
- interconnecting a plurality of cords of the belt or rope, the cords including a plurality of wires, to form a bridge circuit, at least two legs of the bridge circuit comprising separate and distinct cords of the plurality of cords;
- subjecting the bridge circuit to an excitation voltage;
- outputting a signal voltage from the bridge circuit, the bridge circuit structure suppressing environmental noise to increase signal to noise ratio of the signal voltage;
- and
- monitoring the signal voltage to detect a fault condition of the rope,
- wherein each leg of the bridge circuit is configured as an LCR circuit allowing for measurement of complex impedance of the legs of the bridge circuit.
3 more elements
An elevator system comprising:
- an elevator car;
- one or more sheaves;
- a belt or rope comprising a plurality of wires arranged into a plurality of cords for supporting and/or driving the elevator car routed across the one or more sheaves and operably connected to the elevator car, the plurality of cords interconnected to form a bridge circuit, at least two legs of the bridge circuit comprising separate and distinct cords of the plurality of cords;
- wherein each leg of the bridge circuit is configured as an LCR circuit allowing for measurement of complex impedance of the legs of the bridge circuit.
1 more element
Dependencies are inferred from the claim text.