Grooved Magnet Device for Position Sensor Accuracy
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Solution Overview
Problem
Conventional position sensors with cuboid magnet structures suffer from reduced measuring length due to magnetic field edge effects, leading to increased space occupation and manufacturing costs.
Innovation Solution
A magnet device with a groove in the magnetizing direction ensures equal magnetic field intensity components in the transverse direction, integrated with a magnet bracket and magnetic field concentrating segments, reducing the axial length and enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a cuboid magnet structure is used, then the magnet can provide sufficient magnetic field intensity in the middle region, but the magnetic field intensity at the two ends is reduced due to edge effects, resulting in a short measuring length
Solution Approach 1:
The magnet is segmented by introducing grooves that divide the magnet body into multiple regions. This segmentation redistributes the magnetic field distribution, creating multiple high-intensity magnetic field regions along the sensing direction, thereby extending the effective measuring length without compromising detection accuracy.
Solution Approach 2:
The grooves are strategically positioned to create local variations in magnetic field distribution. By modifying the local structure through grooves, the magnetic field intensity is enhanced at specific regions (creating multiple peak values), which extends the measuring length while maintaining reliable detection throughout the extended range.
2Measurement precision
If the magnet is made longer in the axial direction to ensure accurate detection, then the detection accuracy is improved, but the space occupied by the magnet increases and manufacturing cost rises
Solution Approach 1:
Instead of extending the magnet length to improve detection accuracy, the invention segments the magnet structure using grooves. This creates multiple high magnetic field intensity regions within a compact length, achieving accurate detection over an extended measuring length without increasing the magnet's physical volume.
Solution Approach 2:
The invention transitions from extending the magnet in one dimension (length) to creating multiple magnetic field intensity peaks through structural modification in another dimension (cross-sectional geometry via grooves). This dimensional shift allows extended measuring length without proportional increase in magnet volume.
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 magnet device provides a target magnetic field with consistent intensity, improving detection accuracy and reducing space and manufacturing costs while preventing detection errors caused by magnetic field edge effects.
Implementation Method 1
the magnet device has a magnetizing direction z and has magnetic field intensity components Bz in the magnetizing direction z
Data Source
AI summary
Provided is a magnet device for use with a position sensor. The magnet device has a magnetizing direction and has magnetic field intensity components in the magnetizing direction. The magnet device is formed with a groove recessed in the magnetizing direction, so that the magnetic field intensity components are substantially equal in the transverse direction of the magnetizing direction. The present invention further discloses a magnet assembly including the magnet device for use with a position sensor and a sensing system including the magnet assembly, particularly a neutral position sensor. The axial measuring length of a transmission shaft is prolonged with the length of the magnet device remains unchanged to meet the requirements of different customers, and the reliability of the sensing system is improved.