Dual-Worm Slew Drive Biasing for Brake-Free Antenna Positioning
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Solution Overview
Problem
Satellite antenna positioners require complex motorized drives with active braking for precise tracking across the entire horizon, which are costly and prone to mechanical mismatches leading to positioning errors.
Innovation Solution
A slew drive actuation system utilizing dual drive slew drives with differential biasing and self-locking worms to eliminate the need for brakes, reducing precision tolerance requirements and mechanical mismatches, while maintaining accurate positioning and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex motorized drives with active braking are used for precise tracking, then positioning accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent removes the braking system from the motorized drive, extracting the harmful component that caused mechanical mismatches and positioning errors. The self-locking worm gear mechanism inherently prevents backward motion without requiring active brakes, simplifying the system while maintaining positioning accuracy.
Solution Approach 2:
The worm gear mechanism provides self-locking functionality automatically, eliminating the need for separate braking systems. The inherent friction and gear geometry self-regulate to prevent backward motion, making the system self-sufficient for maintaining position without complex control systems.
2Measurement precision
If complex motorized drives with active braking are used for precise tracking, then positioning accuracy is improved, but manufacturing cost increases
Solution Approach 1:
By removing the braking system and complex control mechanisms, the patent significantly reduces manufacturing cost. The simplified worm gear-based self-locking mechanism requires fewer precision components and less complex assembly processes.
Solution Approach 2:
The patent employs simpler, more cost-effective worm gear components that can be manufactured with standard tolerances rather than requiring expensive high-precision motors and brakes. The self-locking feature is achieved through inherent gear geometry rather than expensive active control systems.
3Measurement precision
If complex motorized drives are used to account for movement, then tracking precision is improved, but mechanical mismatches and positioning errors increase
Solution Approach 1:
The self-locking worm gear automatically compensates for movement and maintains position without requiring complex coordination between multiple motors. The inherent self-locking feature prevents backlash and positioning drift, improving reliability.
Solution Approach 2:
The patent changes the fundamental operating parameter from active braking control to passive self-locking through gear geometry. This parameter change eliminates the source of mechanical mismatches that occurred in complex motorized systems.
4Device complexity
If self-locking worms are used to eliminate brakes, then device complexity is reduced, but precision tolerance requirements increase
Solution Approach 1:
The worm gear self-locking mechanism can be manufactured with standard tolerances rather than requiring ultra-precise machining. The self-locking feature arises from the inherent geometry of worm gears, which naturally provide high reduction ratios and self-locking characteristics without requiring tight tolerance control.
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 achieves high accuracy and reliability in positioning payloads without brakes, improving efficiency and reducing manufacturing costs by simplifying the system and eliminating backlash.
Implementation Method 1
A slew drive actuation system utilizing dual drive slew drives with differential biasing and self-locking worms to eliminate the need for brakes
Implementation Method 2
a first gearmotor configured to rotate the first worm gear, a second gearmotor configured to rotate the second worm gear
Data Source
AI summary
Systems and methods for positioning a payload are provided including at least one slew drive configured to rotatably secure to a payload, the at least one slew drive including a first worm gear, a second worm gear, and a worm wheel engaged with the first and second worm gears, a first gearmotor configured to rotate the first worm gear, a second gearmotor configured to rotate the second worm gear, and a controller configured to bias at least one of the first gearmotor and the second gearmotor relative to the worm wheel.