Encoder Rotation Status Adaptive Processing
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Solution Overview
Problem
Existing encoders face challenges in accurately detecting absolute positions when the code plate is rotating, leading to a demand for improved detection accuracy.
Innovation Solution
The encoder includes a rotatable measurement target with an absolute pattern and circuitry that generates a signal representing the absolute position, with a processing scheme that changes based on the rotation status, utilizing offset slit tracks and incremental patterns to enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional absolute value encoder detects the absolute pattern while the code plate is rotating, then the detection process can be performed, but the detection accuracy deteriorates
Solution Approach 1:
The encoder dynamically switches between two processing schemes based on the rotation status of the code plate. When rotation is detected, the first processing scheme is used; when stationary, the second processing scheme is applied. This dynamic adaptation resolves the contradiction by optimizing detection accuracy for each operational state.
Solution Approach 2:
The patent changes the processing parameters based on rotation status. The first processing scheme uses different evaluation criteria than the second scheme, allowing the system to adapt its detection parameters to the current operational state, thereby maintaining high accuracy whether rotating or stationary.
2Measurement precision
If a single processing scheme is used for both rotating and stationary states, then the device complexity is reduced, but the detection accuracy for rotating states deteriorates
Solution Approach 1:
The system employs dynamic switching between processing schemes based on detected rotation status. This allows the use of optimized schemes for each state without requiring a completely separate system, balancing accuracy requirements with manageable complexity.
Solution Approach 2:
The encoder uses a universal detection framework that can operate in multiple modes (rotating and stationary) by switching processing schemes. This multi-functional approach maintains accuracy across different states while avoiding the need for entirely separate detection systems.
3Measurement precision
If the encoder uses only absolute pattern detection, then the absolute position can be detected, but the ability to detect rotation status deteriorates
Solution Approach 1:
The evaluation unit is designed to perform multiple functions: it evaluates both the absolute pattern for position detection and the incremental pattern for rotation status detection. This multi-functional evaluation unit resolves the contradiction by enabling both detection tasks within a single processing framework.
Solution Approach 2:
The patent merges the absolute pattern detection and incremental pattern detection into a unified processing system. The evaluation unit combines information from both patterns to simultaneously determine absolute position and rotation status, eliminating the need for separate detection systems.
Data Source
AI summary
An encoder includes a measurement target and circuitry. The measurement target includes an absolute pattern and is rotatable. The circuitry is configured to generate, via a processing scheme, a signal representing an absolute position of the measurement target based on the absolute pattern. The circuitry is configured to detect, based on the absolute pattern, whether the measurement target rotates or not. The circuitry is configured to change the processing scheme based on whether the measurement target rotates or not.