Rotation Angle Sensor Calibration for Inclined Axes
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Solution Overview
Problem
Existing rotation angle sensors face challenges in maintaining accurate interpolation and calibration due to mechanical angle errors, particularly in the context of rotating bodies with inclined axes, leading to angular errors and displacement issues.
Innovation Solution
A rotation angle sensor system that includes a calibration parameter calculating part, moving radius computing part, and calibration part, which utilize multiple detection signals to calculate and correct for mechanical angle errors by determining calibration parameters based on the phase and amplitude of signals from a rotating body, thereby improving angular accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the rotating body is inclined relative to the sensor, then the sensor can detect rotation in practical applications, but mechanical angle errors and angular errors occur reducing measurement precision
Solution Approach 1:
The patent calculates calibration parameters based on the relationship between the inclined rotation angle and the mechanical angle, transforming the measurement parameters to compensate for the inclination. By changing the reference frame and calculating correction factors, the system maintains measurement precision despite the inclined configuration.
Solution Approach 2:
The patent implements a feedback mechanism where the calculated calibration parameters are used to correct the raw sensor measurements. The system continuously compares the detected mechanical angle with the expected rotation angle and applies corrections based on the calibrated error characteristics, thereby maintaining accuracy in inclined configurations.
2Measurement precision
If multiple detection signals are used to calculate calibration parameters, then angular accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the calibration process into distinct steps: acquiring multiple detection signals at different rotation positions, calculating calibration parameters from these signals, and applying corrections separately. This segmentation makes the complex process more manageable and systematic, reducing the perceived complexity while maintaining high accuracy.
Solution Approach 2:
The patent performs calibration measurements and parameter calculations in advance during a setup phase, before normal operation begins. By pre-calculating the calibration parameters based on multiple detection signals, the system establishes correction factors that simplify subsequent measurements, reducing real-time processing complexity while maintaining high angular accuracy.
Data Source
AI summary
To provide a rotation angle sensor which outputs N periods (N>1) of a first signal of a first phase and a second signal of a second phase forming a predetermined phase angle with the first phase per single rotation of a rotating body. The rotation angle sensor includes a calibration parameter calculating part which calculates, in a mechanical angle of one angular range having a first mechanical angle different from a reference mechanical angle as its starting point, based on the first signal and the second signal, a calibration parameter which calibrates an error in a moving radius of the rotating body in the reference mechanical angle of the rotating body. The one angular range may have the first mechanical angle as its starting point and a second mechanical angle as its ending point.