Magnetic Rotation-Angle Detector Compact Design
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Solution Overview
Problem
Existing magnetic rotation-angle detectors require increased size to achieve high resolution for absolute rotation angle detection, as they need multiple magnetic resistance elements and signal tracks, leading to a larger device footprint.
Innovation Solution
A magnetic rotation-angle detector design featuring a disk-shaped magnet with alternating high and low magnetic flux permeability sections, combined with a magnetic sensor and calculation unit, allowing for the detection of two frequency components from a single magnetic track, thereby reducing the device size while maintaining high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple magnetic resistance elements and signal tracks are arranged concentrically on the magnetic-body slit plate to detect absolute rotation angle with high resolution, then measurement precision is improved, but device complexity and area increase
Solution Approach 1:
The patent combines multiple signal tracks (first and second signal tracks with different frequencies) onto a single magnetic-body slit plate, and integrates multiple magnetic resistance elements (first and second magnetic resistance elements) onto a single detection body. This merging approach enables high-resolution absolute rotation angle detection while reducing the overall device complexity and area compared to having separate tracks and elements for each signal.
Solution Approach 2:
The magnetic-body slit plate serves multiple functions: it generates both the first and second signal tracks with different frequencies, and the detection body with multiple magnetic resistance elements processes both signals simultaneously. This multi-functionality allows the system to achieve high measurement precision without proportionally increasing device complexity, as the same structural components handle multiple detection tasks.
2Measurement precision
If the area of the rotating disk and detection body is increased to accommodate multiple signal tracks and magnetic resistance elements, then measurement precision is improved, but the size of the magnetic rotation-angle detector increases
Solution Approach 1:
The patent merges multiple signal tracks and magnetic resistance elements into a compact concentric arrangement on the same rotating disk and detection body. By combining the first and second signal tracks and their corresponding magnetic resistance elements into a single integrated structure, the patent achieves high measurement precision without requiring a large increase in the area of the rotating disk and detection body.
Solution Approach 2:
The patent utilizes the radial dimension of the rotating disk to arrange signal tracks and magnetic resistance elements concentrically at different radii. This dimensional arrangement allows multiple signals to be packed into a compact area, enabling high measurement precision without proportionally increasing the overall area of the detection system.
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 the detection of absolute rotation angles with high precision in a compact form factor, as it separates and utilizes two frequency components from a single magnetic track, achieving downsized yet high-resolution angle detection.
Implementation Method 1
a magnetic-body slit plate that is rotated together with the magnet, where a part having a high magnetic flux permeability and a part having a low magnetic flux permeability are alternately and repeatedly arranged thereon so as to change the magnetic flux permeability m times per rotation
Data Source
AI summary
Provided is a magnetic rotation-angle detector that includes a disk-shaped magnet that is magnetized so as to change magnetic poles n times per rotation (where n is an integer equal to or larger than 1); a magnetic-body slit plate that is rotated together with the magnet, where a part having a high magnetic flux permeability and a part having a low magnetic flux permeability are alternately and repeatedly arranged thereon so as to change the magnetic flux permeability m times per rotation (where m is an integer equal to or larger than 2 and m>n); a magnetic sensor that detects magnetism from the magnet when the magnet has passed by through the magnetic-body slit plate; and a calculation unit that obtains the rotation angle of the magnet from the output from the magnetic sensor.