Special-Shaped Magnetic Element for Linear Movement Sensing
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Solution Overview
Problem
Conventional movement sensing devices face increased application costs and limited range due to the need for a nonlinear relationship in magnetic force curves, which requires a sufficient distance between magnetic elements and sensors, restricting their applicability.
Innovation Solution
A movement sensing device featuring a special-shaped magnetic element with a magnetization direction perpendicular to a plane, connected to an object and positioned between two magnetic sensors, allowing for linear measurement of movement by calculating the difference in magnetic forces sensed by these sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional magnetic sensing devices use a nonlinear relationship in the curve chart, then the magnetic element can be positioned closer to the sensors, but the application cost increases due to complex calibration requirements
Solution Approach 1:
The patent changes the geometric parameters of the magnetic element from a conventional circular shape to a special shape with specific dimensional relationships (where the distance between parallel sides is equal to the radius). This parameter change transforms the magnetic field distribution characteristics, creating a linear relationship between magnetic force difference and displacement, thereby eliminating the need for complex nonlinear calibration while maintaining measurement precision
Solution Approach 2:
The patent employs asymmetric geometry in the magnetic element design, where one side has a different configuration compared to the other. This asymmetry, combined with the specific dimensional relationship (distance between parallel sides equals radius), creates an optimized magnetic field gradient that produces linear sensing characteristics, resolving the contradiction between measurement accuracy and calibration complexity
2Ease of manufacture
If the distance between the magnetic element and sensors is increased to present a linear relationship, then calibration costs are reduced, but the range of applications is limited
Solution Approach 1:
By changing the geometric parameters of the magnetic element to a special shape with specific dimensional relationships, the patent achieves linear sensing characteristics at optimized distances. This allows the device to maintain both calibration simplicity and broad application range, as the linear relationship holds across the full sensing distance range without requiring excessive separation between components
3Device complexity
If conventional magnetic elements are used with nonlinear magnetic force curves, then the device structure is simpler, but assembly tolerances are reduced due to sensitivity to positioning
Solution Approach 1:
The patent changes the magnetic element geometry to a special shape with specific dimensional relationships, which transforms the magnetic field distribution to produce linear characteristics. This geometric transformation makes the sensing output less sensitive to small variations in assembly position, thereby increasing assembly tolerances while maintaining device structural simplicity
Solution Approach 2:
Instead of trying to achieve linear sensing through complex sensor arrangements or signal processing, the patent inverts the approach by creating linearity through the magnetic element's geometry itself. This inversion simplifies the overall device structure while simultaneously improving robustness to assembly variations
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 design ensures linearity in magnetic force differences relative to movement, reducing calibration costs and increasing assembly tolerances, enabling accurate movement measurement with minimal calibration, thus expanding the device's range of applications.
Implementation Method 1
the principle of sensing by a conventional movement sensing device is to calculate a change in movement of a magnetic element (a magnet, for example) by utilizing a change in a magnetic field of the magnetic element in a space
Data Source
AI summary
Disclosed is a movement sensing device adapted to sense an amount of movement of an object. The movement sensing device includes a first magnetic sensor, a second magnetic sensor, a special-shaped magnetic element, and a controller. The special-shaped magnetic element has a magnetization direction, is connected with the object, and is adapted to be moved along a direction parallel to a connection line between the first magnetic sensor and the second magnetic sensor. The special-shaped magnetic element, the first magnetic sensor, and the second magnetic sensor are disposed on a plane. The magnetization direction is perpendicular to the plane. The controller is electrically connected to the first magnetic sensor and the second magnetic sensor. The controller calculates the amount of movement according to a difference between magnetic forces sensed by the first magnetic sensor and the second magnetic sensor from the special-shaped magnetic element.