Flexible Sensor Monitoring Carbon Brush Wear State
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Solution Overview
Problem
Existing monitoring systems for electrical devices lack effective methods to detect the wear state of brushes and slip rings, leading to inadequate timely maintenance and potential equipment failures.
Innovation Solution
A monitoring apparatus and system utilizing a flexible sensor with a signal processing circuit to determine the wear state of carbon brushes and rotating components by measuring the electrical resistance variation based on the sensor's radius of curvature, coupled with a wear state monitor that communicates wear state information to a user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional monitoring methods are used for brushes and slip rings, then the system structure remains simple, but the ability to detect wear state timely is insufficient leading to potential equipment failures
Solution Approach 1:
The patent replaces traditional mechanical wear detection methods with a flex sensor that uses electrical resistance changes to detect brush wear. The flex sensor's resistance varies based on its radius of curvature, which changes as the brush wears and the spring deflects, providing non-mechanical wear state monitoring that improves reliability without significantly increasing system complexity
Solution Approach 2:
The patent introduces a flex sensor as an intermediary element between the brush assembly and the monitoring system. This sensor mediates the detection of wear by translating physical brush position changes into electrical resistance signals that can be processed and analyzed to determine wear state, enabling timely detection while maintaining system simplicity
2Loss of time
If no monitoring system is installed, then the device complexity remains low, but maintenance timing is inadequate leading to equipment failures
Solution Approach 1:
The patent implements preliminary monitoring action by continuously tracking brush wear state through the flex sensor before actual failure occurs. The system detects wear trends and can alert operators in advance, allowing maintenance to be scheduled proactively rather than reactively, thus reducing maintenance timing losses while keeping the monitoring apparatus relatively simple
Solution Approach 2:
The patent establishes a feedback loop where the flex sensor continuously monitors brush position and wear state, and this information is fed back to the monitoring system. The system processes resistance changes over time to determine wear progression and can trigger alerts or warnings, enabling timely maintenance decisions without requiring complex monitoring infrastructure
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
Enables timely detection of brush and slip ring wear, facilitating scheduled maintenance and reducing the risk of equipment failures by providing accurate and reliable wear state monitoring.
Implementation Method 1
The flexible sensor may have an electrical resistance that varies based on a radius of curvature of the flexible sensor
Data Source
AI summary
A monitoring apparatus configured for monitoring a carbon brush of a brush holder assembly of an electrical machine. The monitoring apparatus may include a flexible sensor and a signal processing circuit for processing a signal received from the flexible sensor. The flexible sensor may have an electrical resistance that varies based on a radius of curvature of the flexible sensor, wherein the radius of curvature of the flexible sensor may be associated with a deflection of a spring providing a force to engage the carbon brush with a rotating component of the electrical machine. The signal processing circuit may be coupled to the sensor and may be configured to determine a measure of a wear state of the carbon brush using information about the variable resistance of the flexible sensor.