Rotational Encoder Spacer Design for Stable Reading Distance
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Solution Overview
Problem
Existing systems face challenges in precisely adjusting and maintaining a stable reading distance between sensitive patterns and encoder tracks, which is crucial for accurate determination of torque and rotational information.
Innovation Solution
A system is introduced that includes a casing with a guide bearing and a module, featuring a spacer for adjusting the reading distance between the encoder and sensor, ensuring precise positioning and reliable signal delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reading distance between sensitive patterns and encoder tracks is adjusted precisely, then measurement precision is improved, but device complexity increases due to the need for precise adjustment mechanisms
Solution Approach 1:
A spacer element is introduced as an intermediary component between the encoder track and the sensitive pattern. This spacer provides a fixed, stable reading distance without requiring complex adjustment mechanisms, thereby improving measurement precision while reducing device complexity
Solution Approach 2:
The reading distance parameter is standardized through the use of spacers with predetermined thicknesses. This transforms the adjustable parameter into a fixed value, simplifying the device while maintaining measurement precision through controlled parameter selection
2Reliability
If the reading distance is made stable and equivalent for multiple sensors, then reliability is improved, but device complexity increases due to the need for stable positioning structures
Solution Approach 1:
The spacer acts as a mediator that ensures stable and equivalent reading distances for multiple sensors simultaneously. By providing a fixed geometric relationship between the encoder track and sensor, it eliminates the need for complex active positioning structures while maintaining reliability
Solution Approach 2:
The spacer creates equipotential reading conditions for multiple sensors by ensuring they all operate at the same stable reading distance from the encoder track. This uniform positioning simplifies the overall structure while maintaining equivalent and reliable measurement conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enhances the reliability and precision of torque and rotational information determination by stabilizing the reading distance, thereby improving the accuracy of torque measurement.
Implementation Method 1
each of the tracks has a succession of pairs of North and South poles to form a multipolar magnetic track delivering a pseudo-sinusoidal magnetic signal
Implementation Method 2
the sensor comprising a sensitive pattern arranged at a reading distance from the track to deliver the rotation information as a function of said movement
Data Source
Figure 1~1a
Figure 2~4
Figure 5
AI summary
The invention relates to a system for determining information on the rotation of a member (1) around an axis (R) by means of a device comprising an encoder (11, 12) carried by a body (50) integral in rotation with said member, said encoder having a track (11a, 12a) capable of emitting a periodic signal representative of the rotational movement of said member; a sensor comprising a sensitive pattern (15, 16) arranged at a reading distance (d) from the track (11a, 12a) to deliver the information as a function of said movement; said system comprising a casing (17) in which said member is mounted in rotation by means of a bearing (18) and, fixed in the casing (17), a module (19) on which the sensor is associated, the guide bearing (18) being carried by the module (19), a spacer (26) for adjusting the reading distance (d) being arranged between the body (50) and the guide bearing (18).