Displacement Detection Device Using Magnetic Concentrators
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Solution Overview
Problem
Conventional displacement detection devices require expensive magnetic multipole magnets, increasing costs and limiting the detectable range to the pitch of the magnetic detection element.
Innovation Solution
A displacement detection device using a rod-shaped magnet with a predetermined angle and pairs of magnetic detection element groups with magnetic concentrators to detect magnetic flux density, allowing for wider detection ranges with monopole magnets by reducing disturbance noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a magnetic multipole magnet is used to expand the magnetic field range, then the detectable displacement range is widened, but the cost increases
Solution Approach 1:
Magnetic concentrators are introduced as intermediary elements between the monopole magnet and the magnetic detection elements. These concentrators reshape and redirect the magnetic flux from the monopole magnet to create an extended magnetic field range, achieving the same effect as a multipole magnet but with a simpler, cheaper monopole configuration
Solution Approach 2:
The invention changes the magnetic field distribution parameters by using multiple magnetic concentrators positioned at specific intervals around the monopole magnet. This reconfigures the magnetic flux density distribution to extend the detectable range while maintaining cost-effectiveness with a monopole design
2Ease of manufacture
If a monopole magnet is used to reduce cost, then the manufacturing cost decreases, but the detectable range is limited to the pitch of the magnetic detection element
Solution Approach 1:
Magnetic concentrators serve as mediators that transform the limited magnetic field of a monopole magnet into an extended field. The concentrators are positioned between the monopole magnet and detection elements to redirect and extend the magnetic flux, enabling detection over a range larger than the detection element pitch
Solution Approach 2:
The invention extends the magnetic field detection in additional spatial dimensions by strategically positioning magnetic concentrators around the monopole magnet. This creates magnetic field extensions in multiple directions, effectively increasing the detectable displacement range beyond the single-pitch limitation
3Length of stationary object
If magnetic detection elements are arranged in pairs with magnetic concentrators, then the detectable range is extended, but the sensor structure becomes more complex
Solution Approach 1:
The sensor structure is segmented into multiple magnetic detection elements arranged in pairs, each associated with specific magnetic concentrators. This segmentation allows each element pair to detect magnetic field changes in specific regions, collectively extending the overall detectable range while maintaining manageable complexity through modular arrangement
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 solution enables wider detectable ranges and reduced noise interference, effectively utilizing monopole magnets to enhance displacement detection capabilities.
Implementation Method 1
magnetic concentrators which convert a magnetic flux in a second direction orthogonal to the one direction and the first direction into a magnetic flux in the first direction
Implementation Method 2
magnetic detection element groups, which detect a magnetic flux density of a magnetic field formed by the magnet
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Provided is a displacement detection device which reduces the influence of disturbance noise on a magnetic field to be detected and makes a range detectable by a monopole magnet wider than a pitch of a magnetic detection elements. A displacement detection device 3 includes a magnet 2 which is displaced in a displacement direction Ds, is rod-shaped and has a form in which a longitudinal direction and the displacement direction Ds form a predetermined angle θ, and a sensor IC 1 in which magnetic detection element groups, which detect a magnetic flux density of a magnetic field formed by the magnet 2 in an x direction and a z direction orthogonal to the displacement direction Ds, are arranged in pairs with a predetermined interval dp, and which outputs a difference between outputs of the magnetic detection element groups.