Elevator with a monitoring arrangement for monitoring an integrity of suspension members with separated circuitries

Patent metadata

Field	Value
Publication number	US-11623844-B2
Application number	US-201816611534-A
Country	US
Kind code	B2
Filing date	Jun 1, 2018
Priority date	Jun 21, 2017
Publication date	Apr 11, 2023
Grant date	Apr 11, 2023

Abstract

An elevator suspension member arrangement includes a monitoring arrangement monitoring an integrity status of suspension members having electrically conductive cords. The monitoring arrangement includes: a generator generating phase shifted first and second alternating voltages; input and output connectors each establishing electrical contacts to cords in one of the suspension members; a voltage analyzer measuring and analyzing a neutral point voltage resulting from applying the first and second alternating voltages to first and second cords of the one suspension member; a supply circuitry having supply lines electrically interconnecting the generator with the input connectors; and a measurement circuitry including measurement lines electrically interconnecting the analyzer with at least one of the input connectors and the output connectors. The supply and measurement lines are separated from each other whereby disturbing influences of impedances through the supply circuitry is minimized due to voltage measurements being performed through the separate measurement circuitry.

First claim

The invention claimed is:

1. An elevator with a suspension member arrangement including a plurality of suspension members, each of the suspension members including electrically conductive cords, and a monitoring arrangement for monitoring an integrity status of the suspension member arrangement, the monitoring arrangement comprising:
an alternating voltage generator arrangement, including at least one alternating voltage generator, for generating first and second alternating voltages being phase shifted with respect to each other;
a plurality of input connectors and output connectors, each of the connectors establishing electrical contact to cords in one of the suspension members;
a voltage analyzer arrangement, including at least one voltmeter, for measuring and analyzing a neutral point voltage resulting upon applying each one of the first and second alternating voltages to first and second cords of the one suspension member, respectively, and after transmission of the first and second alternating voltages through the first and second cords and superposition of the transmitted first and second alternating voltages at a neutral point at which the first and second cords are electrically interconnected;
a supply circuitry including supply lines electrically interconnecting the alternating voltage generator arrangement with the input connectors and with the output connectors, and a measurement circuitry including measurement lines electrically interconnecting the voltage analyzer arrangement with at least one of the input connectors and the output connectors; and
wherein the supply lines and the measurement lines are separate lines.

2. The elevator according to claim 1 wherein the input connectors and the output connectors interconnect a group of the cords in parallel to each other.

3. The elevator according to claim 1 wherein an electrical resistance through one of the supply lines is non-negligible compared to an electrical resistance through the cords contacted by the one supply line and electrically series-connected to the one supply line.

4. The elevator according to claim 1 wherein the supply lines each have a length of at least 0.2 m.

5. The elevator according to claim 1 wherein the alternating voltage generator arrangement and the voltage analyzer arrangement are configured such that electric currents transmitted through the supply lines by the application of the first and second alternating voltages are stronger than electric currents transmitted through the measurement lines by the application of the first and second alternating voltages.

6. The elevator according to claim 1 wherein the supply lines have a larger cross-section than a cross-section of the measurement lines.

7. The elevator according to claim 1 wherein first ends of the supply lines are connected to the alternating voltage generator arrangement and first ends of the measurement lines are connected to the voltage analyzer arrangement, and wherein second ends of the supply lines and second ends of the measurement lines are each directly connected to one of the input connectors or one of the output connectors.

8. The elevator according to claim 1 wherein first ends of the supply lines are connected to the alternating voltage generator arrangement and first ends of the measurement lines are connected to the voltage analyzer arrangement, and wherein second ends of both the supply lines and the measurement lines are connected to each other before being commonly connected via a connector line to one of the input connectors or one of the output connectors.

9. A monitoring arrangement for monitoring an integrity status of a suspension member arrangement of an elevator, the suspension member arrangement including a plurality of suspension members, each of the suspension member having electrically conductive cords, the monitoring arrangement comprising:
an alternating voltage generator arrangement including at least one alternating voltage generator for generating first and second alternating voltages being phase shifted with respect to each other;
a plurality of input connectors and output connectors, each of the connectors being configured for establishing electrical contact to the cords in one of the suspension members;
a voltage analyzer arrangement including at least one voltmeter, the voltage analyzer arrangement measuring and analyzing a neutral point voltage resulting upon applying each one of the first and second alternating voltages to first and second cords of at least one of the suspension members, respectively, the first and second cords being electrically interconnected at a neutral point, and after transmission of the first and second alternating voltages through the first and second cords and superposition of the transmitted first and second alternating voltages at the neutral point the neutral point voltage is generated;
a supply circuitry including supply lines electrically interconnecting the at least one alternating voltage generator with the input connectors and with the output connectors, and a measurement circuitry including measurement lines electrically interconnecting the at least one voltmeter with at least one of the input connectors and with the output connectors; and
wherein the supply lines and the measurement lines are separate lines.

10. An elevator with a suspension member arrangement including a plurality of suspension members, each of the suspension members including electrically conductive cords, and a monitoring arrangement for monitoring an integrity status of the suspension member arrangement, the monitoring arrangement comprising:
an alternating voltage generator arrangement, including at least one alternating voltage generator, for generating first and second alternating voltages being phase shifted with respect to each other;
a plurality of input connectors and output connectors, each of the connectors establishing electrical contact to cords in one of the suspension members;
a voltage analyzer arrangement, including at least one voltmeter, for measuring and analyzing a neutral point voltage resulting upon applying each one of the first and second alternating voltages to first and second cords of the one suspension member, respectively, and after transmission of the first and second alternating voltages through the first and second cords and superposition of the transmitted first and second alternating voltages at a neutral point at which the first and second cords are electrically interconnected;
a supply circuitry including supply lines electrically interconnecting the alternating voltage generator arrangement with the input connectors, and a measurement circuitry including measurement lines electrically interconnecting the voltage analyzer arrangement with at least one of the input connectors and the output connectors;
wherein the supply lines and the measurement lines are separate lines; and
wherein first ends of the supply lines are connected to the alternating voltage generator arrangement and first ends of the measurement lines are connected to the voltage analyzer arrangement, and wherein second ends of both the supply lines and the measurement lines are connected to each other before being commonly connected via a connector line to one of the input connectors or one of the output connectors.

Assignees

• Inventio Ag

Inventors

• Henneau Philippe
• Heinz Kurt

Classifications

• B66B7/1223 Primary

  by analysing electric variables · CPC title

• B66B5/0031

  for safety reasons · CPC title

• B66B7/062

  Belts · CPC title