Encoder Signal Amplitude Balancing for Accurate Lissajous Angles
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Solution Overview
Problem
Existing encoders require complex configurations and increased workloads to accurately determine the Lissajous angle due to errors in sinusoidal wave signals that are 90 degrees out of phase, necessitating individual correction of these signals.
Innovation Solution
An encoder with a phase signal generator producing sinusoidal signals 90 degrees out of phase, a Lissajous angle calculator, and an amplitude adjustor that only adjusts the amplitude of one signal to equalize it with the other, allowing for accurate Lissajous angle determination with a simpler configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If errors of both signals that are 90° out of phase are corrected individually, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and corrects only the amplitude error component from the signal errors, rather than correcting all error types individually. By focusing solely on amplitude adjustment through the amplitude adjustor, the system achieves sufficient measurement precision while avoiding the complexity of comprehensive error correction circuits.
Solution Approach 2:
The amplitude adjustor serves multiple functions: it adjusts signal amplitude levels, enables Lissajous figure formation, and facilitates angle determination. This multi-functional component replaces what would otherwise require separate correction circuits for each signal, reducing overall device complexity while maintaining measurement accuracy.
2Measurement precision
If errors of both signals that are 90° out of phase are corrected individually, then measurement precision is improved, but workloads increase
Solution Approach 1:
The patent extracts and corrects only the amplitude error component from the signal errors, rather than correcting all error types individually. By focusing solely on amplitude adjustment through the amplitude adjustor, the system achieves sufficient measurement precision while avoiding the complexity of comprehensive error correction circuits.
Solution Approach 2:
The amplitude adjustor serves multiple functions: it adjusts signal amplitude levels, enables Lissajous figure formation, and facilitates angle determination. This multi-functional component replaces what would otherwise require separate correction circuits for each signal, reducing overall device complexity while maintaining measurement accuracy.
Data Source
AI summary
An encoder includes: a phase signal generator that generates and outputs first and second sinusoidal analog signals that are out of phase with each other by 90 degrees, according to a movement of a measurement target; a Lissajous angle calculator that determines a Lissajous angle from the first and second analog signals; and an amplitude adjustor that adjusts an amplitude of only the first analog signal output from the phase signal generator and outputs the adjusted amplitude to the Lissajous angle calculator.