Encoder Signal Center-Voltage Adjustment for Precise Interpolation
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Solution Overview
Problem
Existing encoders face challenges in achieving high precision displacement measurement due to deviations in center voltage of periodic signals, which affect the accuracy of interpolation and digitalization processes.
Innovation Solution
The proposed encoder system includes a center-voltage detecting unit and a reference-voltage adjusting unit to adjust the center voltage of periodic signals to a predetermined reference voltage, ensuring accurate interpolation and enhancing the precision of encoder digital signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the encoder operates without center voltage adjustment, then the device complexity is reduced, but the measurement precision deteriorates due to voltage deviations affecting interpolation accuracy
Solution Approach 1:
The patent applies preliminary action by detecting the center voltage of periodic signals before the interpolation process and adjusting it to a predetermined level. This preliminary voltage adjustment ensures that subsequent interpolation operations are performed on properly conditioned signals, thereby improving displacement measurement precision without adding complex real-time correction mechanisms during the measurement process itself.
Solution Approach 2:
The patent employs parameter changes by modifying the voltage parameter of periodic signals through detection and adjustment mechanisms. By changing the center voltage parameter to a predetermined reference level before interpolation, the system optimizes signal conditions for high-precision measurement while maintaining relatively simple circuit architecture.
2Measurement precision
If center voltage detection and adjustment units are added, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent applies self-service by implementing a feedback mechanism where the center voltage detecting unit continuously monitors the voltage level and the adjusting unit automatically corrects deviations. This self-regulating system maintains high measurement precision through automatic voltage normalization without requiring external intervention or complex control systems, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent employs feedback by using the center voltage detecting unit to monitor signal characteristics and feeding this information to the adjusting unit, which modifies the voltage level accordingly. This closed-loop feedback mechanism ensures consistent measurement precision while keeping the overall system architecture relatively simple through automated correction rather than complex manual calibration systems.
3Measurement precision
If the periodic signals have varying center voltages, then the ease of operation is maintained, but the measurement precision deteriorates due to interpolation errors
Solution Approach 1:
The patent applies preliminary action by performing center voltage detection and adjustment before the interpolation operation. This preliminary conditioning of periodic signals ensures that they meet the voltage requirements for accurate interpolation without requiring complex real-time adjustments during operation, thereby maintaining ease of operation while improving measurement precision.
Solution Approach 2:
The patent employs parameter changes by modifying the center voltage parameter of periodic signals to a predetermined reference level before interpolation. This parameter normalization simplifies the operation by automatically handling voltage variations, eliminating the need for manual signal conditioning while ensuring high interpolation accuracy.
Data Source
AI summary
An encoder has a scale having an optical, magnetic or electrostatic displacement detection pattern. An encoder head detects the displacement detection pattern and generates at least two periodic signals that differ in phase, thereby to determine a displacement with respect to the scale. A center-voltage detecting unit detects only the center voltage of each periodic signal. A reference-voltage adjusting unit adjusts the center voltage detected by the center-voltage detecting unit to a predetermined reference voltage.