Rotational Angle Detection Error Correction via Steady-State Calibration
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Solution Overview
Problem
Conventional rotational angle detection systems experience errors due to differences between the coordinate systems of the rotating body and the magnetic field generation source and the detection apparatus, leading to inaccuracies in calculated rotational angles.
Innovation Solution
A rotational angle detection apparatus that includes a magnetic field detection system for detecting components in multiple directions, a correction value calculation section to address steady-state errors, and an angle computing section to calculate the rotational angle based on detection data and correction values, using methods such as Fourier transforms to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional magnetic field detection is used without correction, then the detection system is simple, but angle errors occur due to coordinate system differences
Solution Approach 1:
The patent applies preliminary action by calculating correction values in advance based on steady-state errors detected at multiple predetermined rotational angles. These correction values are stored and then applied during actual rotational angle detection to eliminate coordinate system mismatches. This approach improves measurement precision by addressing errors before they affect operational measurements, while maintaining relatively simple real-time detection processes.
Solution Approach 2:
The patent utilizes parameter changes by detecting magnetic field components at multiple predetermined rotational angles and using these variations to calculate correction values. By analyzing how magnetic field parameters change with rotation angle, the system determines steady-state errors and computes appropriate corrections. This method transforms the static detection problem into a dynamic characterization process that improves accuracy without significantly complicating the overall system.
2Measurement precision
If correction values are calculated for multiple angle states, then angle error correction improves, but calculation and processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the rotational angle range into multiple predetermined angle states (e.g., 0°, 90°, 180°, 270°). At each segmented angle state, the system independently detects magnetic field components and calculates specific correction values. This segmentation approach improves angle error correction accuracy by addressing errors at discrete points, while keeping each individual calculation simple and manageable. The segmented correction values are then interpolated or applied during continuous rotation.
3Measurement precision
If steady-state error correction is implemented, then rotational angle linearity improves, but detection and processing time increases
Solution Approach 1:
The patent applies preliminary action by performing steady-state error characterization and correction value calculation during an initial calibration phase or system setup, rather than during operational detection. This preliminary characterization improves rotational angle linearity by establishing accurate correction values in advance, while minimizing time loss during actual measurements since the correction application is computationally efficient and based on pre-determined values.
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 system effectively reduces angle errors and improves the linearity of detected rotational angles by accounting for coordinate system differences and steady-state errors, enhancing the precision of rotational angle detection.
Implementation Method 1
a magnetic field detection apparatus that detects magnetic field components in at least two directions, and outputs resulting detection data
Data Source
AI summary
To reduce the error in a rotational angle detected by a rotational angle detection apparatus, provided is a rotational angle detection apparatus that detects a rotational angle of a magnetic field generation source, including a magnetic field detection apparatus that detects magnetic field components in at least two directions, and outputs resulting detection data; a correction value calculating section that calculates correction values for correcting an angle error of the rotational angle, based on a steady-state error that does not depend on rotation of the magnetic field generation source; and an angle computing section that calculates the rotational angle of the magnetic field generation source based on the detection data and the correction values, and outputs an angle signal indicating the rotational angle.