Rotary Position Sensor Signal Swapping for Mismatch Detection
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Solution Overview
Problem
Existing position sensor systems for detecting rotary movement face challenges in accurately detecting gain, offset, and phase mismatches, especially in high-speed systems, due to sequential processing and additional signal wires required for error detection.
Innovation Solution
A position sensor system that includes a swapping unit to alternate signal processing units between sensor outputs, allowing for the detection of mismatches as ripples, and compensating for errors by averaging signals, thereby enabling fast error detection and reduction of offset, gain, and phase errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequential processing of Sine-signal and Cosine-signal is used, then device complexity is reduced, but measurement precision deteriorates due to position-dependent errors at high speeds
Solution Approach 1:
The patent divides the signal processing into two separate signal processing units, each dedicated to processing one sensor signal. This segmentation allows parallel processing of Sine-signal and Cosine-signal, eliminating position-dependent errors that occur in sequential processing, especially at high rotational speeds.
Solution Approach 2:
The patent implements periodic swapping of signal processing units between sensor signals at regular intervals. This periodic action allows the system to alternate between different processing configurations, enabling error detection and compensation while maintaining accurate position detection throughout the measurement cycle.
2Measurement precision
If parallel processing of Sine-signal and Cosine-signal is used, then measurement precision is improved, but device complexity increases due to requiring two signal processing units
Solution Approach 1:
The patent introduces dynamic swapping of signal processing units between sensor signals. Instead of having permanently dedicated processing units, the system dynamically alternates which processing unit handles which signal, allowing one processing unit to serve multiple functions over time while maintaining parallel processing benefits during each measurement interval.
Solution Approach 2:
The patent makes signal processing units universal by enabling each unit to process either Sine-signal or Cosine-signal through periodic swapping. This multi-functionality reduces the need for permanently dedicated processing units while maintaining the accuracy benefits of parallel processing during measurement.
3Device complexity
If multiplexer is used for sequential processing, then device complexity is reduced, but productivity deteriorates due to feedback requirements and additional signal wires
Solution Approach 1:
The patent extracts the multiplexer and feedback control requirements from the system by implementing dedicated or periodically-swapped processing units for each signal. This elimination of the multiplexer removes the need for feedback signal wires and control logic, simplifying the system architecture while enabling faster parallel processing.
Data Source
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AI summary
The invention refers to a Position sensor system (1), particularly for detecting rotary movement, comprising: a position sensor (2), particularly for detecting rotary movement, with a first sensor output (3) and a second sensor output (4), a first signal processing unit (5) for processing, particularly amplifying and filtering, the signal of the first sensor output (3) or the second sensor output (4), a second signal processing unit (6) for processing, particularly amplifying and filtering, the signal of the second sensor output (4) or the first sensor output (3), a first system output (7) providing the output of the first signal processing unit (5) or of the second signal processing unit (6), and a second system output (8) providing the output of the second signal processing (6) unit or of the first signal processing unit (5), which is characterized in that the position sensor system (1) further comprises a swapping unit (9) for swapping the first signal processing unit (5) from the first sensor output (3) and first system output (7) to the second sensor output (4) and second system output (8) and for simultaneously swapping the second signal processing unit (6) from the second sensor output (4) and second system output (8) to the first sensor output (3) and first system output (7) and vice versa. The invention further relates to a method for detecting errors in a position sensor system (1), particularly for detecting rotary movement.