Rotation Angle Detector Using Multi-Directional Magnetic Flux Detection
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Solution Overview
Problem
Conventional rotation angle detectors require the rotational center of the magnetic field to coincide with the detector's center, making it difficult to arrange multiple detectors without ideal magnetic field change and increasing sensor size due to the need for magnetic detection elements to be arranged in multiple directions.
Innovation Solution
A rotation angle detector design featuring a magnet that rotates with a first and second pair of magnetic detection ICs arranged at specific intervals and orientations relative to the magnet, allowing for detection of magnetic flux differences in various directions, enabling accurate angle detection without the need for direct alignment with the magnetic field center.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rotational center of the magnetic field coincides with the detector's center, then the magnetic field provides ideal change for detection, but it becomes difficult to arrange multiple detectors and increases the overall system size
Solution Approach 1:
The invention divides the detection function into multiple magnetic detection elements (first pair and second pair) arranged at different positions and orientations. Each element detects magnetic flux in specific directions, and their combined outputs enable accurate rotation angle detection without requiring the detector center to coincide with the magnetic field center, thus reducing sensor size while maintaining detection precision
Solution Approach 2:
The invention transitions from detecting magnetic field changes in a single plane to detecting magnetic flux components in multiple spatial dimensions. By arranging detection elements to detect flux in different directions (radial and circumferential components) and combining these multi-dimensional measurements, the system achieves accurate angle detection without requiring ideal geometric alignment, thereby reducing the required sensor area
2Measurement precision
If magnetic detection elements are arranged in multiple directions to detect rotating magnetic field, then rotation angle can be detected accurately, but the sensor shape cannot be made smaller than the region where elements are disposed
Solution Approach 1:
The invention segments the detection function across multiple elements positioned at different locations and orientations. The first pair of elements detects magnetic flux in one direction while the second pair detects flux in another direction. This segmentation allows accurate rotation angle detection through combined processing of multiple directional measurements while enabling a more compact sensor shape compared to requiring all elements in a single plane
Solution Approach 2:
Each magnetic detection element is optimized for detecting magnetic flux in its specific local direction. The first pair of elements is positioned and oriented for optimal detection in one direction, while the second pair is positioned and oriented for optimal detection in another direction. This local optimization of detection quality at each position enables accurate overall angle measurement while allowing compact sensor geometry
3Reliability
If multiple rotation angle detectors are disposed for backup or prevention of malfunction, then reliability improves, but the magnetic field detected by each detector does not provide ideal change and rotation cannot be detected
Solution Approach 1:
The invention creates a universal detection system where multiple magnetic detection elements detect different components of the magnetic flux (radial and circumferential components) that can all be processed to determine rotation angle. This multi-functional approach allows any subset of the detection elements to potentially provide sufficient information for rotation detection, improving system reliability while maintaining detection capability across multiple arrangements
Solution Approach 2:
The signal processing unit acts as an intermediary that receives outputs from multiple magnetic detection elements arranged at different positions and orientations. It processes these intermediate measurements through mathematical operations (such as calculating ratios or angles from flux components) to produce the final rotation angle output, enabling accurate detection even when detectors are not ideally positioned relative to the magnetic field center
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
Enables compact and efficient detection of rotation angles even in multiple arrangements, reducing the size of the sensor and improving the detection accuracy by normalizing magnetic flux differences, thus overcoming the limitations of conventional designs.
Implementation Method 1
a first pair of magnetic detection elements...configured to detect magnetic flux of the magnet
Data Source
AI summary
A rotation angle detection system comprises a magnet arranged to rotate around a rotation axis. A first magnetic detection circuit defines a first surface provided with a first and second pairs of magnetic detection elements. A signal processing unit is configured to output a signal representative of a rotation angle of the magnet based on outputs of the first and second pair of magnetic detection elements. A second magnetic detection circuit is provided with another first and second pairs of magnetic detection elements. The signal processing unit is configured to output a redundant signal corresponding to a rotation angle of the magnet based on outputs of the other first pair of magnetic detection elements and the other second pair of magnetic detection elements.