Balanced Multi-Magnet Sensor Array for Vibration-Resistant Proximity Detection
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Solution Overview
Problem
Existing proximity sensing technologies are susceptible to vibrations, gravity, and temperature changes, and often require single magnet configurations that are less effective in detecting ferrous, permeable, or magnetic targets with high reliability and accuracy.
Innovation Solution
A sensor assembly utilizing two axially-magnetized ring magnets in a repulsive configuration with a non-magnetic insert, creating a moveable balanced zone that shifts in response to target proximity, and equipped with sensing devices like reed switches or Hall sensors to detect disturbances, enhancing shock and vibration resistance and temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single magnet configuration is used, then the device complexity is reduced, but the reliability and accuracy in detecting ferrous, permeable, or magnetic targets deteriorates
Solution Approach 1:
The single magnet is divided into two separate magnets: a first magnet and a second magnet. This segmentation allows each magnet to independently interact with the target, improving detection reliability while maintaining manageable complexity through modular design.
Solution Approach 2:
The two magnets are arranged in a spatial configuration where they are separated by a non-magnetic insert, creating a multi-dimensional magnetic field interaction pattern. This dimensional arrangement enables enhanced detection capability by introducing a new spatial dimension to the magnetic sensing approach.
2Reliability
If existing proximity sensing technologies are used, then the basic sensing function is achieved, but susceptibility to vibrations, gravity, and temperature changes increases
Solution Approach 1:
The non-magnetic insert acts as a counterbalancing element between the two magnets, providing mechanical and magnetic balance that counteracts the effects of vibrations and gravity. This counterweight approach stabilizes the magnetic field configuration against external disturbances.
Solution Approach 2:
The system utilizes the temperature-dependent properties of magnetic materials by arranging two magnets with opposite polarities. As temperature changes, the magnetic fields shift in a controlled manner, allowing the system to compensate for thermal effects and maintain stable sensing performance.
3Measurement precision
If magnets are placed close together to enhance sensing capability, then the measurement precision improves, but the magnetic field interference between magnets increases
Solution Approach 1:
A non-magnetic insert is introduced as an intermediary element between the two magnets. This intermediary maintains the magnets in close proximity for enhanced sensing while preventing direct magnetic field interference between them, as the non-magnetic material blocks magnetic flux paths.
Solution Approach 2:
The non-magnetic insert creates a localized region with different magnetic properties between the two magnets. This local quality change allows the system to achieve high precision detection through close magnet spacing while managing interference through the specialized non-magnetic material in the intermediate zone.
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
The sensor assembly provides reliable end-sensing detection with improved resistance to environmental factors and vibrations, maintaining accuracy and sensitivity across varying temperatures and target materials, with scalable design options for specific applications.
Implementation Method 1
The sensing magnet and internal magnet are in a repulsive configuration such that the magnets are oriented to each other with like-poles facing one another. A moveable balanced zone is between the magnets and defined by magnetic fields emanating from each of the sensing magnet and the internal magnet.
Implementation Method 2
The sensing device is configured to transition from the first state to a second state upon detection of a disturbance to the balanced zone, wherein such disturbance causes the balanced zone to shift a sufficient amount to be detectable by the sensing device.
Data Source
AI summary
An end-sensing sensor assembly for proximity sensing including one or more sensing devices positioned between two axially magnetized ring magnets having like poles facing one another such that the magnetic fields emanating from the two axially magnetized ring magnets define a moveable balanced zone therebetween. The one or more sensing devices may be positioned within the balanced zone or outside the balanced zone, or combinations thereof. The balanced zone shifts in response to the approach of a magnetic, permeable, and/or ferrous material which cause the sensing device to actuate in response to a sufficient shift in the balanced zone. Upon removal or departure of the magnetic, permeable, and/or ferrous material, the balance zone shifts back to the initial position prior to the approach of the magnetic, permeable, and/or ferrous material.