Irrigation Motor Overcurrent Control With Stage-Based Thresholds
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Solution Overview
Problem
Existing mobile irrigation systems lack versatile and dynamically adjustable overcurrent protection for their motors, pumps, and electromechanical components, requiring manual adjustments and physical replacements of fuses or relays.
Innovation Solution
A mobile irrigation system with an overcurrent protection system that includes a main control panel, tower control panels, and wireless communication elements, providing dynamic, controllable, and programmable overcurrent protection by adjusting current thresholds based on motor operating stages and ambient temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed-level overcurrent protection devices (fuses, circuit breakers) are used, then simple and reliable protection is provided, but they require physical replacement to change protection levels and cannot adapt to different operating conditions
Solution Approach 1:
The patent implements dynamic overcurrent protection by replacing static fuses and circuit breakers with programmable microcontrollers that can adjust current thresholds in real-time based on motor operating conditions, temperature, and stage-specific requirements, enabling the system to adapt protection levels without physical hardware changes
Solution Approach 2:
The system changes the electrical parameter (current threshold) dynamically through software programming rather than physical replacement, allowing different current protection levels for different motor stages and environmental conditions while using the same hardware platform
2Ease of operation
If manual adjustment of overload relays is performed onsite, then protection levels can be changed, but it requires site visits and manual intervention which reduces efficiency
Solution Approach 1:
The system performs self-adjustment of overcurrent protection parameters by automatically sensing motor operating conditions, ambient temperature, and stage requirements, then programmatically setting appropriate current thresholds without requiring manual intervention or site visits
Solution Approach 2:
The microcontroller continuously monitors motor current, temperature sensors, and operational stage information, using this feedback to automatically adjust protection thresholds in real-time, eliminating the need for manual onsite adjustments
3Reliability
If fixed current thresholds are used for overcurrent protection, then simple protection logic is maintained, but false overcurrent events occur during high current draw stages
Solution Approach 1:
The system implements dynamic current thresholds that vary according to the motor's operational stage, allowing higher permissible current during startup and acceleration phases while maintaining strict protection during normal operation, thereby preventing false positives without complex hardware circuits
Solution Approach 2:
The current protection threshold parameter is changed dynamically based on operational context, with the microcontroller selecting different threshold values for different motor stages and environmental conditions, improving reliability without additional hardware complexity
Data Source
AI summary
An overcurrent protection system for a mobile irrigation system. The overcurrent protection system includes a number of control panels each including a controller configured to generate a motor control signal for activating one of the motors of the mobile irrigation system, transmit the motor control signal to the motor, determine a current magnitude of electrical current passing through a motor power branch line electrically connected to the motor, and restrict current to the motor if the current magnitude is above a current magnitude threshold. The controller is further configured to set the current magnitude threshold according to one of a plurality of motor operation stages. The current magnitude threshold can also be set remotely.