Position Detector Phase Correction Fourier Analysis
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Solution Overview
Problem
Conventional position detectors face accuracy issues due to variations in offset, phase difference, and amplitude ratio, leading to errors in correction values and reduced responsiveness, which hinders improved interpolation accuracy.
Innovation Solution
A position detector that includes storage for offset, phase, and amplitude ratio correction values, along with calculators for eliminating errors and analyzing changes through Fourier analysis, to calculate updated correction values and virtual changes, thereby improving accuracy by correcting phase and amplitude ratio errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional correction methods are used to eliminate offset and amplitude ratio errors, then measurement precision is improved, but device complexity increases due to multiple correction calculations
Solution Approach 1:
The patent divides the correction process into distinct functional modules: offset error elimination, amplitude ratio error elimination, and phase difference error elimination. Each module handles a specific type of error independently, making the complex correction process more manageable and systematic while maintaining high measurement precision
Solution Approach 2:
The patent implements feedback mechanisms where correction values are calculated based on detected errors and then applied to improve subsequent measurements. The system continuously monitors measurement accuracy and adjusts correction parameters accordingly, creating a closed-loop system that maintains high precision without requiring overly complex one-time corrections
2Measurement precision
If multiple correction calculations are performed to eliminate phase difference errors, then measurement precision is improved, but loss of time increases due to additional computational steps
Solution Approach 1:
The patent performs preliminary correction calculations for offset errors and amplitude ratio errors before the main phase difference correction. By pre-processing these corrections and storing intermediate results, the system reduces the computational burden during real-time operation, maintaining high precision while minimizing time loss
Solution Approach 2:
The patent dynamically adjusts the correction calculation process based on the actual measurement conditions. When phase difference errors are small, full correction calculations are performed for maximum precision. When time is critical or errors are minimal, the system can use simplified correction methods, optimizing the balance between precision and speed
Data Source
AI summary
In a position detector for converting, into position information, two signals shifted in phase by 90 degrees from each other, a phase correction value calculator for calculating a phase correction value for correcting a phase difference between the two signals calculates a phase change value representing a change in the phase correction value, to find a next phase correction value based on the phase change value and a present phase correction value. A virtual change value calculator calculates, based on second-order components obtained by Fourier analysis of a radius value, a virtual phase change value representing another change in the phase correction value obtained when changes in offset and amplitude ratio are ignored, and a virtual amplitude change value representing a change rate in an amplitude ratio correction value obtained when a change in the phase difference is ignored.