Rotary Encoder Staggered Detection Timing for Peak Current Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional rotary encoders with multiple detection portions simultaneously reading a scale lead to increased peak current consumption during measurement operations.
Innovation Solution
Implementing a control device that alternates the reading timing of detection portions around a rotary encoder, allowing some detection portions to read patterns at one timing and others at a different timing, and calculating measurement results from these readings to reduce peak current consumption while maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple detection portions simultaneously read the scale pattern, then measurement accuracy is improved, but peak current consumption increases
Solution Approach 1:
The patent applies periodic action by dividing the reading operations into different time periods. Multiple detection portions read the scale pattern at different timings rather than simultaneously, with detection portions alternately performing readings in first and second time periods. This temporal distribution maintains measurement accuracy through multiple readings while reducing peak current consumption by preventing simultaneous operation of all detection portions.
Solution Approach 2:
The patent applies segmentation by dividing the set of multiple detection portions into different groups that operate at different timings. The detection portions are segmented into at least two groups, where one group performs readings in a first time period and another group performs readings in a second time period. This segmentation allows the system to maintain the benefit of multiple detection portions for accuracy while reducing peak power consumption through staggered operation.
2Reliability
If multiple detection portions read simultaneously, then detection reliability is improved, but power consumption increases
Solution Approach 1:
The control device implements periodic action by organizing detection portions to perform readings in alternating time periods. During a first time period, certain detection portions perform readings, and during a second time period, other detection portions perform readings. This periodic scheduling ensures detection reliability is maintained through multiple readings while controlling power consumption by limiting the number of simultaneously active detection portions.
Solution Approach 2:
The patent applies dynamics by making the operation state of detection portions changeable over time. The system dynamically switches which detection portions are active during different time periods, rather than having all detection portions continuously or simultaneously active. This dynamic approach maintains detection reliability through multiple readings while adapting power consumption levels by controlling the timing of detection portion operations.
Data Source
AI summary
A measuring device includes a rotary encoder having a rotary scale and a plurality of detection portions, and a control device. The rotary scale are arranged around a rotation axis and has a scale pattern in which a plurality of patterns are arranged along a circumferential direction. The plurality of detection portions are arranged around the rotation axis, and reads the plurality of patterns from the scale pattern. The control device causes one or some detection portions to perform a first reading of the plurality of patterns at a first timing, causes another or other detection portions different from the one or some detection portions to perform a second reading of the plurality of patterns at a second timing different from the first timing, and calculates a measurement result based on a first reading result of the first reading and a second reading result of the second reading.