Elevator Brake Current Derivative Analysis for Mobile Plate Monitoring
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Solution Overview
Problem
Conventional elevator brake monitoring systems require complex installations with multiple sensors, holders, ducts, and wiring, leading to maintenance challenges and potential failures due to fatigue, necessitating a more efficient method to monitor the movement of mobile plates within elevator brake assemblies.
Innovation Solution
A system that uses a processing device and non-transitory storage medium to analyze the derivative of actual braking current data, identifying inflection points to determine if mobile plates are moving correctly, and outputs alerts to inhibit elevator cab movement when deviations occur, reducing the need for extensive maintenance and sensor infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional brake monitoring systems use multiple sensors, holders, ducts, and wiring, then the monitoring coverage is improved, but the device complexity increases and maintenance difficulty worsens
Solution Approach 1:
The patent extracts the monitoring function from complex mechanical sensor assemblies and relocates it to the controller, which analyzes brake coil current data to detect mobile plate position and movement. This eliminates the need for separate sensors, holders, ducts, and wiring while maintaining monitoring capability.
Solution Approach 2:
The controller is given the multi-function of both operating the brake coils and monitoring brake assembly conditions by analyzing current data. This universal approach combines control and monitoring functions in a single device, reducing overall system complexity.
2Reliability
If conventional systems install double set of brake switches, then the reliability of brake monitoring is improved, but the quantity of components increases and maintenance needs worsen
Solution Approach 1:
The brake coil current data serves dual purposes: it both operates the brake system and provides monitoring information. The system self-monitors by analyzing its own operational data, eliminating the need for separate monitoring components while maintaining reliability.
Solution Approach 2:
The patent changes the monitoring parameter from mechanical switch positions to electrical current characteristics. By analyzing changes in brake coil current, the system derives mobile plate position information without requiring additional mechanical sensors or switches.
3Ease of operation
If mechanical brake switches are used for monitoring, then the ease of operation is improved, but the components are subject to fatigue and replacement needs worsen
Solution Approach 1:
The patent replaces mechanical brake switches with an electrical monitoring system that analyzes brake coil current data. This substitution eliminates mechanical wear and fatigue while maintaining operational simplicity through electronic data analysis in the controller.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy of monitoring elevator brake assembly conditions, passively preventing ascending cab over speed and unintended movement, and reduces maintenance needs by automatically detecting and responding to deviations in mobile plate movement.
Implementation Method 1
a coil that when energized moves the at least one mobile plate from an engaged position to inhibit movement of the traction sheave to a disengaged position
Data Source
AI summary
Embodiments of the present disclosure are directed to a system for monitoring conditions of elevator braking assemblies. The system includes a processing device configured to receive an actual braking current data from the elevator braking assembly, determine a derivative, plot a derivative curve, determine a region of interest of the derivative curve that corresponds to an expected movement of the at least one mobile plate of the elevator braking assembly, determine whether a pair of inflection points occurred during the region of interest where one of the inflection points is a minimum point and the other is a maximum point, the maximum having a greater amplitude than the minimum point and occurring after the minimum point, and when the pair of inflection points does not occur during the region of interest, output an alert to the elevator controller to instruct the elevator controller to inhibit movement of the elevator cab.