Angle Measuring Device with Compensation Coupling
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Solution Overview
Problem
Current angle measuring devices in machining equipment and measuring machines lack the precision needed to accurately determine angular positions, especially under varying loads and displacements, which affects the accuracy of rotational movements.
Innovation Solution
An angle measuring device comprising a first and second component group with a scale element and position sensors/transducers, connected via a torsionally stiff but axially and radially flexible compensation coupling, allowing for precise determination of angular positions through scanning of graduations using optical and magnetic principles, with the ability to operate in multiple modes for correction and calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid connection is used between component groups, then measurement stability is improved, but adaptability to load-induced displacements deteriorates
Solution Approach 1:
The compensation coupling changes its physical state by deforming elastically under load, transforming from a rigid connection into a flexible adaptation mechanism. This parameter change allows the system to maintain measurement stability while adapting to displacements caused by gravitational and inertial forces during different operational phases.
Solution Approach 2:
The compensation coupling introduces dynamic adaptability to the otherwise static rigid connection between component groups. During acceleration phases, the coupling deforms to accommodate inertial forces, while during deceleration it returns to its original position, enabling the system to adapt to varying load conditions without compromising measurement stability.
2Measurement precision
If multiple sensors and transducers are used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The measurement system is segmented into functionally distinct modules: a position sensor for primary angular position detection and multiple position transducers for detecting displacements of the scale element. This segmentation allows each component to be optimized for its specific function while working together to achieve high overall measurement precision.
Solution Approach 2:
The compensation coupling acts as an intermediary element that mechanically connects the component groups while allowing controlled relative movements. This intermediary structure enables the position transducers to detect scale element displacements caused by load-induced deformations, providing correction data that enhances measurement precision without requiring complete redesign of the entire system.
3Measurement precision
If correction calculations are performed, then accuracy is improved, but processing time increases
Solution Approach 1:
The system performs preliminary measurements during acceleration and deceleration phases to determine the deformation behavior of the compensation coupling. These preliminary actions establish correction factors that can be applied during normal operation, reducing the computational burden during critical measurement phases while maintaining high accuracy.
Solution Approach 2:
The position transducers provide continuous feedback on the displacement of the scale element relative to the component groups. This feedback information is used to calculate correction values that compensate for load-induced deformations, enabling real-time accuracy improvement without significant processing delays through efficient feedback control algorithms.
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
Enables highly precise determination of angular positions and displacement corrections, achieving sub-micron resolution for axial and lateral positions, thereby improving the accuracy of rotational movements and enabling online correction of workpiece positions during machining or measuring processes.
Implementation Method 1
the first position sensor is able to scan the first graduation in order to determine a first angular position
Implementation Method 2
the first, the second, and the third position transducer are able to scan the first graduation or a further graduation which is situated on the scale element in order to determine further angular positions
Data Source
AI summary
An angle measuring device includes first and second component groups and a bearing. The first component group includes a scale element having a first graduation. The second component group has a first modular unit, including a position sensor, and a second modular unit, including first, second, and third position transducers, and a compensation coupling. The first and second modular units are connected in a torsionally stiff but axially and radially flexible manner. The angle measuring device is operable in first and second modes. In the first mode, the first graduation is scannable by the position sensor to determine a first angular position. In the second mode, the first graduation or a further graduation situated on the scale element is scannable by the position transducers to determine further angular positions. A corrected relative angular position is determinable based on the first angular position and the further angular positions.