Rotating Device Sensor with Multi-Sensor Compensation for Tilt
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Solution Overview
Problem
Existing sensing technologies for rotating bodies face challenges in accurately detecting rotation direction, angle, and angular velocity, especially when the rotating shaft is tilted due to user interference, leading to reduced sensing sensitivity.
Innovation Solution
The apparatus employs a sensor module with first and second sensors positioned opposite to pattern portions, and third and fourth sensors with specific angle differences, along with a rotation information calculator that calculates compensation sensing values to precisely detect rotation information, including direction, angle, and velocity, by averaging or subtracting sensing values to compensate for tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor is used to detect rotation, then the device structure is simple, but sensing accuracy deteriorates when the rotating shaft is tilted
Solution Approach 1:
The sensing system is divided into multiple independent sensors (first sensor, second sensor, third sensor, fourth sensor) positioned at different angular locations around the rotating shaft. Each sensor independently detects rotation information from its specific position, and the results are combined through compensation calculations to achieve accurate detection even when the shaft is tilted.
Solution Approach 2:
The invention transitions from single-point detection to multi-point spatial detection by arranging sensors at different angular positions (0°, 90°, 180°, 270°) around the rotating shaft. This spatial distribution adds dimensional information about the rotation from multiple perspectives, enabling the system to compensate for tilt effects and maintain accuracy.
2Measurement precision
If multiple sensors are added to compensate for tilting, then sensing accuracy improves, but device complexity increases
Solution Approach 1:
The invention merges the detection functions of multiple sensors into a unified rotation information calculation process. The first and second sensors detect rotation in one direction while the third and fourth sensors detect rotation in the opposite direction, and their results are combined through compensation calculations to produce accurate rotation information that is insensitive to shaft tilting.
Solution Approach 2:
The system uses feedback from multiple sensor readings to continuously compensate for tilt effects. By comparing the outputs from sensors positioned at different locations and applying compensation calculations, the system dynamically adjusts the rotation measurement to eliminate errors caused by shaft misalignment or tilting during operation.
Data Source
AI summary
An apparatus for sensing a rotating body includes a unit to be detected including a first pattern portion having first patterns and a second pattern portion having second patterns, and configured to rotate around a shaft, a sensor module including a first sensor and a third sensor disposed opposite to the first pattern portion with the rotating shaft interposed therebetween, a second sensor and a fourth sensor disposed opposite to the second pattern portion with the rotating shaft interposed therebetween, and a rotation information calculator configured to calculate a first compensation sensing value based on a sum of a sensing value of the first sensor and a sensing value of the third sensor, and to calculate a second compensation sensing value based on a sum of a sensing value of the second sensor and a sensing value of the fourth sensor.