Variable-Speed Drive Alignment for Irrigation Spans
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Solution Overview
Problem
Traditional irrigation systems with fixed rate motors experience stress and maintenance issues due to irregular motion, leading to uneven water and chemical application, and alignment errors, resulting in waste and operational inefficiencies.
Innovation Solution
The implementation of a variable-speed drive system with switched reluctance motors and sensors that maintain near-straight alignment by dynamically adjusting the speed of each span, ensuring continuous movement and uniform application of water and chemicals through communication between sensors and variable-drive control units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed rate motors are used to drive irrigation spans, then the system structure is simple and robust, but irregular motion causes stress, wear, and maintenance issues
Solution Approach 1:
The patent applies dynamics by transitioning from fixed-rate motors to variable-speed drive units that can dynamically adjust their rotation speed. Each tower structure's drive unit independently controls its speed based on real-time alignment sensor feedback, enabling the system to adapt to varying operational conditions and maintain span alignment without the stress and wear caused by irregular motion in fixed-rate systems.
2Manufacturing precision
If fixed rate motors are used, then device complexity is low, but alignment precision deteriorates due to alignment errors
Solution Approach 1:
The patent implements feedback control by using alignment sensors to continuously monitor the relative alignment between adjacent spans and providing real-time feedback to the variable-speed drive units. This closed-loop control system adjusts the speed of each tower's drive unit to correct alignment deviations, significantly improving alignment precision compared to fixed-rate motors that lack such feedback mechanisms.
3Manufacturing precision
If irregular motion occurs in fixed rate systems, then device complexity remains low, but uniformity of water and chemical application deteriorates
Solution Approach 1:
The patent applies continuity of useful action by ensuring that the variable-speed drive units operate continuously without the start-stop irregularities characteristic of fixed-rate motors. The system maintains continuous motion with dynamically adjusted speeds, ensuring uniform application of water and chemicals across the irrigation field while eliminating the waste and non-uniformity caused by intermittent operation.
4Manufacturing precision
If variable-speed drive units are implemented, then alignment precision is maintained, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the irrigation system into multiple independently controlled tower structures, each with its own variable-speed drive unit and alignment sensor. This modular approach allows each segment to be controlled individually for precise alignment while maintaining overall system simplicity through standardized, interchangeable components that can be manufactured and maintained separately.
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
This solution reduces wear and maintenance costs, enhances alignment precision, and achieves a more uniform application of irrigation resources, minimizing waste and improving operational efficiency.
Implementation Method 1
Each tower structure includes a variable-speed drive unit, such as a switched reluctance motor
Data Source
AI summary
An irrigation system is disclosed that is configured to maintain a near straight alignment. In an implementation, an irrigation system includes multiple interconnected spans which are supported by multiple tower structures. Each tower structure includes a variable-speed drive unit for selectively driving a tower structure at a selected speed. The irrigation system also includes multiple sensors that are each associated with a corresponding span to determine an alignment of the corresponding span with respect to adjacent spans. Each of the sensors is in communication with a corresponding variable-drive control unit. Each of the variable-drive control units are configured to control the selected speed of a corresponding variable-speed drive unit to maintain the interconnected spans in a substantially linear orientation with respect to adjacent ones of the plurality of interconnected spans along a generally longitudinally oriented axis (e.g., maintain alignment of the spans with respect to each other).