Magnet Transition Section for Displacement Detection Precision
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Solution Overview
Problem
Existing displacement detection units have limited detection angle ranges and significant errors in detecting actual rotation angles, particularly due to insufficient precision and varying magnetic field measurements.
Innovation Solution
A displacement detection unit featuring a magnet with a transition section where the ratio of magnetic volumes of south and north pole regions gradually varies in the rotational direction, allowing for precise detection of displacement through changes in magnetic fields, using a magnetic detector movable relative to the magnet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional magnet with uniform magnetic pole regions is used, then the device structure is simple, but the detection precision of rotation angles deteriorates with significant errors at certain angles
Solution Approach 1:
The magnet is designed with non-uniform magnetic pole regions where the magnetic volume ratio between south and north poles gradually varies in the transition section. This local variation in magnetic properties enables continuous magnetic field changes that improve rotation angle detection precision across all angles, particularly resolving the error problems at specific angles encountered with conventional uniform magnets.
Solution Approach 2:
The invention changes the magnetic volume ratio parameter between south and north pole regions by introducing a transition section. This parameter variation creates a continuous gradient in the magnetic field, allowing the magnetic detector to accurately measure rotation angles throughout the entire range without the significant errors that occur with conventional magnets having fixed, uniform pole regions.
2Adaptability or versatility
If the detection angle range is extended, then the versatility of the displacement detection unit is improved, but the measurement precision deteriorates due to insufficient magnetic field variation
Solution Approach 1:
By creating local quality variations in the magnetic pole regions through the transition section, the magnet generates continuous magnetic field changes that maintain high measurement precision across an extended detection angle range. The gradual variation in magnetic volume ratio ensures that the magnetic detector can distinguish rotation angles accurately throughout the entire measurable range.
Solution Approach 2:
The transition section introduces dynamic characteristics to the magnetic field by creating a continuous gradient rather than fixed, discrete pole regions. This dynamic magnetic field variation with rotation angle enables the system to maintain high precision measurement capability across a wide detection angle range, resolving the trade-off between range and precision.
3Measurement precision
If a magnet with gradual magnetic volume ratio variation is used, then the measurement precision is improved, but the manufacturing complexity increases
Solution Approach 1:
The magnet is segmented into distinct regions: a south pole region, a transition section, and a north pole region. This segmentation approach allows the complex gradual variation in magnetic volume ratio to be achieved through structured zones rather than requiring continuous, impossible-to-manufacture gradients, thereby improving ease of manufacture while maintaining high measurement precision.
Solution Approach 2:
The transition section creates local quality variation in the magnetic properties, concentrating the complexity in a specific region rather than requiring the entire magnet to be manufactured with precise continuous gradients. This localized approach to creating magnetic volume ratio variation makes the manufacturing process more feasible while achieving the desired measurement precision.
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 enhances precision in detecting rotation angles and displacements by minimizing errors and maintaining a wide detectable angle range, improving the accuracy of magnetic field measurements.
Implementation Method 1
a magnet that includes a first magnetic-pole region polarized into a south pole and a second magnetic-pole region polarized into a north pole, and generates a magnetic field around the magnet
Data Source
AI summary
A displacement detection unit includes a magnet and a magnetic detector. The magnet includes a first magnetic-pole region polarized into a south pole and a second magnetic-pole region polarized into a north pole, and generates a magnetic field around the magnet. The magnetic detector is movable relative to the magnet in a first direction, and detects a change in the magnetic field and thereby detects a displacement of the magnet in the first direction. The magnet includes a transition section in which a ratio of a magnetic volume of the second magnetic-pole region in a second direction to a magnetic volume of the first magnetic-pole region in the second direction gradually varies in the first direction. The second direction is orthogonal to the first direction.