Miniature Magnetically-Triggered Proximity Switch
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Solution Overview
Problem
Conventional magnetically-triggered proximity switches are too large for applications with limited space and require external power, limiting their use in certain applications.
Innovation Solution
A miniature magnetically-triggered proximity switch design with a movable second magnet and a cross arm that pivots between switch positions based on magnetic forces, allowing for contact changes without an external power source, and a compact, hermetically sealed switch body made of high-temperature materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sensor with switching circuit mechanism is used, then position sensing function is achieved, but the physical size becomes too large for space-constrained applications
Solution Approach 1:
The patent extracts the switching circuit mechanism from the sensor assembly, eliminating the need for internal power supply and complex electronics within the sensor body. Only the magnetic actuator and contact elements remain, dramatically reducing sensor size while maintaining position sensing functionality through magnetic field detection and mechanical contact switching.
Solution Approach 2:
The patent replaces electronic switching circuits with a magnetic-mechanical switching system. The sensor uses magnetic field interaction between magnets to actuate mechanical contacts, eliminating the need for powered electronic components and reducing the sensor to a passive magnetic actuator with contact elements.
2Reliability
If a conventional sensor requiring external power is used, then position sensing is achieved, but the application range is limited due to power requirements
Solution Approach 1:
The sensor operates autonomously using passive magnetic field detection and mechanical contact switching. The magnetic actuator responds automatically to changes in magnetic field strength, and the mechanical contacts self-switch without external power, enabling deployment in applications where power supply is unavailable or impractical.
3Reliability
If magnetic force is increased to improve switching reliability, then contact actuation becomes more reliable, but the risk of unintended contact closure increases
Solution Approach 1:
The patent employs a dynamic magnetic field response system where the magnetic force varies with the position of the target. The magnetic actuator moves smoothly through intermediate positions based on the changing magnetic field strength, allowing the system to distinguish between gradual position changes and sudden target appearances, thereby reducing false actuation while maintaining reliable switching at the intended threshold.
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 the use of proximity switches in space-constrained applications without the need for external power, providing reliable position sensing and extending the switch's operational life.
Implementation Method 1
the first magnet and the second magnet are selected to create a first magnetic force between the first magnet and the second magnet, and the first magnetic force maintains the cross arm in the first switch position. In addition, the second magnet and a target outside of the switch body are selected to create a second magnetic force between the second magnet and the target, and the second magnetic force causes the cross arm to move from the first switch position to the second switch position if the second magnetic force is greater than the first magnetic force
Data Source
Figure 1A~1C
Figure 2
Figure 3~4
AI summary
A magnetically-triggered proximity switch includes a cylindrical switch body and a first magnet non-movably secured within the switch body. The proximity switch also includes a pivoting cross arm. A second magnet may be movably disposed within the switch body, and the second magnet may be rigidly connected to the cross arm. When a magnetic target is not located within a specified range of the second magnet, the first magnet attracts the second magnet, thereby pivoting the cross arm into a first switch position and closing a first circuit. However, when the magnetic target is located within the specified range, the magnetic attraction between the target and the second magnet is greater than between the second magnet and the first magnet. The second magnet is displaced towards the target away from the first magnet, thereby pivoting the cross arm into a second switch position.