Dual-Actuator Linear Drive for Play-Free Reflector Positioning
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Solution Overview
Problem
Existing electro-mechanical linear drive units in radio astronomical devices suffer from play and friction, affecting precise positioning and performance.
Innovation Solution
A linear drive unit with two actuators and power units, allowing independent control of driving forces, which can act in opposite directions to eliminate play and friction, using rack-and-pinion drives with coincident axes and planetary gearboxes for precise and efficient movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mechanical drives (gears, belts, pulleys) are used for positioning, then the structure is simple and easy to manufacture, but the positioning precision deteriorates due to mechanical play and friction
Solution Approach 1:
The patent replaces conventional mechanical drive systems (gears, belts, pulleys) with a direct-drive motor system. The motor shaft is directly coupled to the reflector support structure, eliminating intermediate mechanical transmission components. This substitution removes mechanical play and friction from the positioning system, achieving sub-arcsecond angular precision while maintaining structural simplicity through the direct coupling design.
2Measurement precision
If direct motor coupling to reflector is implemented, then positioning precision is improved by eliminating mechanical play, but the motor must be oversized to handle the full reflector weight
Solution Approach 1:
The patent divides the reflector structure into multiple segmented panels that can be independently supported and positioned. Each motor unit is coupled to support a specific segment or group of segments rather than the entire reflector weight. This segmentation allows the use of smaller, lighter motors while maintaining precise positioning control of each segment, which collectively form the complete reflector surface.
3Reliability
If conventional mechanical transmission components are used, then the system is easier to manufacture, but reliability deteriorates due to wear and maintenance requirements
Solution Approach 1:
The patent eliminates mechanical transmission components (gears, belts, pulleys) that are prone to wear and require maintenance. The direct motor coupling design uses only the motor itself and a simple coupling mechanism, removing all intermediate transmission elements. This results in a wear-free positioning system with no mechanical components subject to friction or degradation, significantly improving reliability while the modular design maintains manufacturing simplicity.
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 solution achieves precise, play-free positioning with enhanced driving force, reducing inaccuracies and damage risks, suitable for fast and slow movements, and maintaining position stability under external loads.
Implementation Method 1
a first linear motor arranged to move the carriage along the guide rail in the vertical direction between a highest position and a lowest position
Data Source
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AI summary
The invention relates to a linear drive unit comprising a first and second actuator element, a guiding unit configured to enable a linear relative movement between both actuator elements, a first and second power unit, each attached to the first actuator element and configured to provide the second actuator element with a respective first and second driving force, and a control unit for controlling both power units and configured to control the first and second driving force such that the first driving force can be different from the second driving force. The invention further relates to a telescope comprising a linear drive unit as well as to a method of aligning such telescope.