Magnetic Sensor Detecting Linear Movement via Inclined Magnetization
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Solution Overview
Problem
Magnetic sensor devices face a challenge in increasing their detectable range while maintaining a compact size, as existing designs require a large magnetic field generation unit to achieve a wider detection range, leading to a larger device footprint.
Innovation Solution
The magnetic sensor device incorporates a magnetic field generation unit with inclined magnetization directions and strategically positioned magnets, allowing for a smaller magnetic field generation unit region while maintaining a larger detectable range by utilizing a first and second magnetic field generation unit with inclined line segments intersecting towards the movement axis, and optionally including yoke units for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between the two magnets is widened to increase the detectable range, then the detectable range is increased, but the magnetic field generation unit region becomes larger and the device size increases
Solution Approach 1:
The patent applies asymmetry by setting the magnetization directions of the first and second magnets at different angles relative to the movement direction. Specifically, the first magnet has its magnetization direction at a first angle to the movement direction, while the second magnet has its magnetization direction at a second angle to the movement direction. This asymmetric angular configuration allows the magnetic fields to interact in a way that extends the detectable range without requiring increased spacing between magnets, thereby resolving the contradiction between detectable range and device size.
2Area of stationary object
If the magnetic field generation unit region is made smaller to reduce device size, then the device size is reduced, but the detectable range decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the angular parameters of magnetization directions. By setting specific angle relationships between the magnetization directions of the first and second magnets relative to the movement direction, the patent achieves enhanced magnetic field interaction that extends the detectable range. This parameter optimization allows compact magnet spacing while maintaining or improving detectable range, resolving the contradiction between device size and detectable range.
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 enables a significant increase in the detectable range while reducing the size of the magnetic sensor device, allowing for accurate detection of linear movement with a smaller footprint, as demonstrated by simulation results showing up to a 13.8% increase in detectable range without increasing the device's size.
Implementation Method 1
a magnetoresistive effect element (GMR element, TMR element, or the like) in which resistance changes in accordance with changes in an external magnetic field
Implementation Method 2
the magnetic flux generated from the two magnets 130 and 130 and input into the magnetic sensor 120 changes
Data Source
AI summary
A magnetic sensor device for detecting linear movement of a moving body includes a magnetic field generation unit and a magnetic field detection unit, which is provided to be capable of detecting the magnetic field generated by the magnetic field generation unit. The magnetic field detection unit is provided to be relatively moveable along a first axis accompanying linear movement of the moving body. The first axis is parallel to the direction of movement of the moving body. The magnetic field generation unit includes a first magnetic field generation unit and a second magnetic field generation unit. The first magnetic field generation unit and the second magnetic field generation unit are arranged substantially parallel to the first axis. A first line segment parallel to a first magnetization direction of the first magnetic field generation unit is inclined with respect to a second axis orthogonal to the first axis. A second line segment parallel to a second magnetization direction of the second magnetic field generation unit is inclined with respect to the second axis. The first line segment and the second line segment are positioned symmetrically with respect to the second axis and intersect each other to open toward the first axis.