Felling Head Stator Rotor Magnetic Drive
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Forestry machines, such as feller bunchers, rely on traditional hydraulic motors for cutting trees, which are inefficient and bulky, limiting the machine's size and operational capabilities.
Innovation Solution
A felling head equipped with a stator and rotor configuration that produces a time varying magnetic field, using either axially or radially directed flux, to power a saw blade, replacing the hydraulic motor and integrating the saw blade into the rotor, thereby reducing bulk and enhancing operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional hydraulic motor systems are used for felling heads, then the system can provide sufficient power for cutting trees, but the system becomes bulky and inefficient
Solution Approach 1:
The patent replaces the traditional hydraulic motor system with an electric motor system consisting of a stator and rotor. The stator contains coils that generate a rotating magnetic field, which interacts with permanent magnets mounted on the rotor to produce rotational motion. This substitution eliminates the bulky hydraulic components while providing sufficient power for tree cutting operations.
Solution Approach 2:
The patent changes the fundamental operating parameters by using electromagnetic fields instead of hydraulic fluid pressure. The stator coils generate a rotating magnetic field with specific frequency and amplitude characteristics that directly drive the rotor, eliminating the need for hydraulic pumps, valves, and fluid reservoirs that characterize traditional hydraulic systems.
2Adaptability or versatility
If traditional hydraulic motor systems are used for felling heads, then the system can operate in various conditions, but the system becomes complex and less flexible
Solution Approach 1:
The patent replaces complex hydraulic systems with a simpler electric motor design. The stator and rotor configuration with permanent magnets eliminates the need for hydraulic fluid management systems, reducing complexity while maintaining operational flexibility through electrical control.
Solution Approach 2:
The patent extracts and removes the complex hydraulic system components (pumps, valves, reservoirs, filters) from the felling head assembly, retaining only the essential motor function through the stator-rotor electromagnetic system. This extraction simplifies the overall device while preserving adaptability to various cutting conditions.
3Productivity
If the stator coils are positioned to maximize magnetic field generation, then cutting efficiency improves, but the coils may overlap with the accumulation pocket area
Solution Approach 1:
The patent segments the stator coil arrangement into distinct zones, positioning coils in the upper portion of the stator away from the accumulation pocket area. This segmentation allows optimal magnetic field generation in the cutting zone while avoiding interference with the accumulation pocket functionality, resolving the spatial conflict between power generation and material accumulation.
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 configuration enhances the cutting efficiency and reduces the size of the felling head, allowing for improved space utilization and potential integration of additional features like sensors or wireless technologies, while providing precise and repeatable rotational movement.
Implementation Method 1
a stator having coils thereon adapted to produce a time varying stator magnetic field
Implementation Method 2
a rotor having either a set of slots or a set of permanent magnets mounted thereon facing the stator that is adapted to produce either a radially directed flux or an axially directed flux
Data Source
AI summary
A forestry machine configured to cut timber, where the forestry machine comprises a felling head including a support frame having an accumulation pocket, an accumulating arm, and a harvest arm. The forestry machine further comprises a stator having coils thereon adapted to produce a time varying stator magnetic field, a rotor having at least either a set of slots or a set of permanent magnets mounted thereon facing the stator and adapted to produce a radially directed flux or an axially directed flux. The rotor is rotatably coupled to the stator in axial alignment therewith by the time varying stator magnetic field. The rotor comprises a saw blade.