Electric Drive Snapping Rollers for Harvesting
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Solution Overview
Problem
The existing crop harvesting machines with multiple snapping roller pairs require a large number of expensive and heavy picking gears, leading to high axle loads that can exceed permissible limits, necessitating separate transport for wider working widths, which is inefficient and costly.
Innovation Solution
The implementation of an electric drive system for snapping rollers, using a three-phase asynchronous motor with a squirrel cage rotor and a simple three-phase generator, energetically coupled to the carrier vehicle's combustion engine, eliminating the need for a traditional drive train and associated components, and allowing for variable speed control through hydrostatic drives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large number of picking gears are used to drive multiple snapping roller pairs, then the harvesting machine can achieve wider working widths and higher productivity, but the weight of the attachment increases significantly, leading to excessive axle loads
Solution Approach 1:
The patent replaces the traditional mechanical drive train (picking gears, cardan shafts, distributors) with an electric drive system. Each snapping roller pair is equipped with its own electric motor, eliminating the need for complex mechanical power transmission components. This substitution dramatically reduces the attachment weight while maintaining the capability to drive multiple snapping roller pairs for wide working widths
Solution Approach 2:
The patent divides the drive system into independent modular units, with each snapping roller pair having its own dedicated electric motor. This segmentation allows each module to be driven independently without requiring a centralized mechanical drive train, reducing overall system weight and complexity while enabling flexible configuration for different working widths
2Power
If traditional mechanical drive trains with cardan shafts and distributors are used, then power can be transmitted to multiple snapping rollers, but the device complexity and cost increase due to the large number of components
Solution Approach 1:
The patent replaces the complex mechanical power transmission system (cardan shafts, distributors, bevel gears) with an electric power distribution system. Electrical cables connect the power source to individual electric motors at each snapping roller pair, simplifying the overall system architecture while maintaining effective power delivery to all rolling elements
Solution Approach 2:
The electric motor design serves multiple functions: it provides drive power to the snapping rollers, incorporates the picking knives mounting, and integrates the roller support structure. This multi-functionality eliminates the need for separate mechanical components that would otherwise be required for power transmission and structural support
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 design significantly reduces the weight and cost of the harvesting attachment, allows for variable speed control of snapping rollers, and simplifies the drive system by replacing heavy components with cable harnesses, resulting in a more efficient, lightweight, and low-maintenance energy transmission system.
Implementation Method 1
an electrical power generator and electrical line connections between the power generator as a generator and the drive motor as part of a picking unit
Implementation Method 2
The drive motor is part of a snapping roller and is designed as a three-phase asynchronous motor and as a squirrel cage rotor and as an external rotor
Implementation Method 3
This is achieved in a particularly simple manner using a hydrostatic drive with a variable output speed
Data Source
Figure 1
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Figure 4
AI summary
At least one pick roller (2,2') at the pick unit (1) of a harvesting unit carried e.g. by a combine harvester, to harvest standing crops, is powered by an electric drive system. It is driven by the drive shaft from the internal combustion motor. The electrical drive has at least one current generator, an electric drive motor (25) and leads connecting them.