Angled Reed Switch Flux Leakage Detection in Electromagnetic Brakes
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Solution Overview
Problem
Conventional electromagnetic or magnetic brakes often fail to disengage due to wear or foreign objects, making it difficult to diagnose malfunctions, especially in hidden or automated systems, leading to resource wastage and system downtime.
Innovation Solution
Incorporating a reed switch oriented at an angle adjacent to the air gap in the electromagnetic or magnetic circuit to detect flux leakage, providing a clear indication of operational malfunctions by switching states only when significant flux leakage occurs, thus minimizing false positives and reducing the need for extensive diagnostic efforts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electromagnetic brake is used without additional monitoring components, then the device complexity is low, but the ability to detect brake malfunction is poor leading to undetected failures
Solution Approach 1:
A reed switch is introduced as an intermediary component positioned adjacent to the air gap in the electromagnetic circuit. The reed switch detects changes in magnetic flux caused by wear or foreign objects, providing indirect monitoring of brake health without requiring direct contact with moving parts. This mediator enables reliable malfunction detection while maintaining relatively simple system architecture.
2Difficulty of detecting and measuring
If the brake is made visible or equipped with complex monitoring systems, then malfunction detection capability improves, but the device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical monitoring systems or visible inspection mechanisms with an electromagnetic-based reed switch sensor. The reed switch utilizes magnetic field detection to monitor brake conditions, substituting mechanical complexity with a simpler electromagnetic sensing approach that provides reliable malfunction detection without requiring visible access or complex diagnostic equipment.
3Measurement precision
If the reed switch is oriented parallel to the air gap, then the switching state changes with air gap variations, but this causes false positives due to normal wear and operational variations
Solution Approach 1:
The reed switch is oriented at an angle (asymmetric orientation) relative to the air gap rather than parallel to it. This asymmetric positioning causes the reed switch to remain predominantly in one switching state during normal operation, while still detecting significant flux leakage when malfunctions occur. The angular orientation creates a threshold effect that filters out normal operational variations while maintaining sensitivity to actual problems.
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 quick identification of brake malfunctions without significant resource expenditure, ensuring efficient operation and reducing downtime by providing a reliable, low-cost indication of brake functionality.
Implementation Method 1
a reed switch is oriented in a particular manner adjacent an air gap in the circuit to indicate an operating condition of the brake
Data Source
Figure 1~2
Figure 3~4
AI summary
A brake is provided that employs an electromagnetic or magnetic circuit to disengage the brake and in which a reed switch (26) is used to indicate an operating condition of the brake. The reed switch (26) is positioned across an air gap between two members of the electromagnetic or magnetic circuit. The reed switch is oriented such that a longitudinal axis (54) of the reed switch extends in a direction other than parallel to one or both of (i) the axis of rotation ( 28) for rotating components of the brake and (ii) a direction of a magnetic force at a point in the air gap where the magnetic force is greatest.