Variable-Speed Irrigation Drive for Full Torque at Low Speeds
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Solution Overview
Problem
Existing irrigation systems with 3-Phase AC induction motors face limitations in providing maximum torque at low speeds, leading to inefficient operation and increased costs due to the need for start-stop modes and oversized motors, while lacking systems that effectively combine high speed and variable speed motors for optimal operational effectiveness.
Innovation Solution
A system integrating sensor inputs, control systems, field mapping, and high speed and variable speed motor designs, utilizing Switch Reluctance and DC Permanent Magnet motors with Variable Frequency Drives to maintain full torque at speeds below the rated motor speed, allowing for continuous movement and improved operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If 3-Phase AC induction motors are used in irrigation machines, then the system provides reliable power for moving the irrigation machine, but the output torque decreases as operating speed decreases below rated speed, limiting low-speed operation
Solution Approach 1:
The patent applies parameter changes by switching between different motor types (3-Phase AC induction motor for high-speed travel, DC permanent magnet motor for low-speed irrigation) based on operational requirements. This allows the system to optimize torque output at each speed range, maintaining full torque capability at low speeds during irrigation while achieving high speeds for repositioning.
2Force
If start-stop mode is used at low speeds to compensate for torque limitations, then sufficient torque is provided during irrigation, but the advantages of constant movement are eliminated and operational efficiency decreases
Solution Approach 1:
The patent implements dynamics by using a variable speed drive system that continuously adjusts motor speed and torque output based on real-time operational needs. The system transitions smoothly between high-speed travel mode and low-speed irrigation mode without start-stop cycles, maintaining constant movement and maximizing productivity while providing sufficient torque when needed.
3Force
If oversized motors are used to provide sufficient torque during irrigation, then full torque is available at low speeds, but system cost increases
Solution Approach 1:
The patent applies segmentation by dividing the motor system into two specialized motors: a 3-Phase AC induction motor optimized for high-speed travel, and a DC permanent magnet motor optimized for low-speed high-torque irrigation operations. This segmentation allows each motor to be right-sized for its specific function, avoiding the need for an oversized motor that would be required if a single motor handled both functions.
Solution Approach 2:
The patent implements multi-functionality through a dual-motor system with a common variable speed drive that can operate either motor independently or in combination. This universal control system manages both the high-speed travel function and low-speed irrigation function, eliminating the need for separate dedicated systems while optimizing performance for each operation.
4Speed
If high speed motors are used for repositioning, then travel time between fields is reduced, but torque availability at low speeds during irrigation is limited
Solution Approach 1:
The patent applies dynamics by implementing a variable speed drive system that dynamically switches between high-speed operation for repositioning and low-speed high-torque operation for irrigation. The system adapts its speed and torque characteristics in real-time based on the operational phase, achieving both high ground speeds during travel and sufficient torque during irrigation without compromise.
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 high ground speeds, reduced energy consumption, and increased application rates, while minimizing stress on drivetrain components and ensuring uniform water distribution, thus enhancing the operational effectiveness of irrigation machines.
Implementation Method 1
DC Permanent Magnet motors with Variable Frequency Drives to maintain full torque at speeds below the rated motor speed
Implementation Method 2
Switch Reluctance and DC Permanent Magnet motors with Variable Frequency Drives
Data Source
AI summary
The present invention provides a system and method which combines sensor inputs, control systems, field mapping, motor controls, and high speed and variable speed motor designs within an irrigation machine. According to a preferred embodiment, the present invention provides systems which are capable of full torque operation, even at speeds less than the rated speed of the motor. According to further preferred embodiments, the present invention utilizes a combination of motor types including Switch Reluctance, DC Permanent Magnet and AC Permanent Magnet motors in combination with Variable Frequency Drives.