Target Magnet Mechanism for Proximity Switch Hysteresis Reduction
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Solution Overview
Problem
Conventional magnetic proximity switches experience hysteresis effects that delay the return to an unactivated state, reducing the accuracy of rotational position determination due to the magnetic field interaction between the target magnet and the sensing magnet.
Innovation Solution
A target magnet mechanism with a plurality of magnets in an alternating magnetic pole configuration, featuring a center magnet with opposite polarity to the sensing magnet and flanking magnets with the same polarity as the sensing magnet, which narrows the magnetic field and allows for precise state changes by attraction and repulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional single target magnet is used, then the structure is simple, but hysteresis effects cause delayed reset and reduced sensing accuracy
Solution Approach 1:
The conventional single target magnet is segmented into multiple magnets (first, second, third, and fourth magnets) with alternating polarities. This segmentation creates multiple localized magnetic fields that interact with the sensing magnet, reducing hysteresis effects and improving rotational position sensing accuracy by enabling more precise detection of angular position changes.
Solution Approach 2:
The target magnet mechanism uses an asymmetric arrangement of magnets with specific polarity configurations (N-S-N-S pattern) rather than a symmetric single magnet design. This asymmetry in magnetic pole distribution creates a more complex but controllable magnetic field interaction that reduces hysteresis and improves measurement precision.
2Productivity
If the target magnet moves quickly through the sensing area, then productivity is improved, but hysteresis delays the switch reset and reduces accuracy
Solution Approach 1:
By dividing the target magnet into multiple segmented magnets with alternating polarities, the system can maintain fast switching speeds while improving accuracy. The segmented structure creates multiple interaction points with the sensing magnet, allowing the switch to reset more quickly after activation, thus reducing hysteresis effects and enabling faster productivity without sacrificing measurement precision.
3Area of stationary object
If a single magnet configuration is used, then the device complexity is low, but the sensing area is too broad causing hysteresis effects
Solution Approach 1:
The sensing area is effectively narrowed by segmenting the target magnet into multiple magnets with alternating polarities. This segmentation creates distinct magnetic field zones that interact with the sensing magnet in a more controlled manner, reducing the effective sensing area width and minimizing hysteresis effects, while the overall device complexity remains manageable through systematic arrangement.
Solution Approach 2:
Different regions of the target magnet mechanism have different local magnetic qualities (alternating N-S-N-S polarity pattern). This local quality variation creates specific interaction zones with the sensing magnet that narrow the effective sensing area and reduce hysteresis, while maintaining a relatively simple overall device structure through repetitive local patterns.
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 configuration reduces hysteresis effects, narrows the sensing area, and enables faster switching between activated and unactivated states, improving the accuracy of rotational position sensing.
Implementation Method 1
the center magnet attracts the sensing magnet of the proximity switch, triggering the proximity switch into an activated state
Implementation Method 2
the flanking magnet repels the sensing magnet of the proximity switch, releasing the proximity switch into a deactivated state
Implementation Method 3
a plurality of magnets disposed in an alternating magnetic pole configuration forming a narrowed magnetic field of the target magnet mechanism
Data Source
AI summary
A target magnet mechanism for a proximity switch. The target magnet mechanism includes a plurality of magnets disposed in an alternating magnetic pole configuration forming a narrowed, polarity reversing magnetic field. A center magnet has a magnetic polarity opposite the magnetic polarity of a sensing magnet of the proximity switch. A flanking magnet includes a magnetic polarity opposite the magnetic polarity of the center magnet and the same as the sensing magnet. So configured, the plurality of magnets trigger the proximity switch to an activated state by pulling on a magnetic field of the proximity switch via the opposed polarity of the center magnet and the sensing magnet. In addition, the plurality of magnets release the proximity switch back to an unactivated state by pushing on the magnetic field of the proximity switch via the same polarity of the flanking magnet and the sensing magnet.