Portable Cutting Tool Speed Control for Precision and Rapid Cutting
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Solution Overview
Problem
Existing hand-portable garden, forestry, and construction processing devices lack user-friendly features, particularly in terms of adjustable speed control and ease of use, which affects their efficiency and versatility in cutting through various materials.
Innovation Solution
A hand-portable device equipped with a rotationally movable cutting tool, an electric drive motor, and a user-adjustable control device that allows for two operating modes: a sensitive mode for delicate cutting and a high-speed mode for quick processing, enabling multi-functionality and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the motor operating element is adjusted over the full adjustment range to achieve high target speed, then the cutting tool reaches maximum speed quickly, but the control becomes insensitive for delicate processing
Solution Approach 1:
The adjustment range of the motor operating element is divided into a first segment (0-50%) and a second segment (50-100%). The first segment provides sensitive control for delicate processing with fine speed increments, while the second segment enables rapid acceleration to high speeds with coarser control steps. This segmentation resolves the contradiction by allowing the user to select the appropriate control sensitivity based on the processing requirements.
2Ease of operation
If the target speed increases linearly with the adjustment range, then the control is sensitive and easy to operate, but the time to reach high speeds is excessive
Solution Approach 1:
The control characteristic is made dynamic by implementing different speed-proportioning behaviors in different segments of the adjustment range. In the first segment, the target speed increases gradually with high sensitivity for precise control. In the second segment, the target speed increases more rapidly to reach maximum speed faster. This dynamic control strategy resolves the contradiction between control sensitivity and response time.
3Adaptability or versatility
If a single operating mode is used for speed control, then the device structure remains simple, but the device cannot adapt to different processing requirements
Solution Approach 1:
The device implements multiple operating modes (first operating mode with sensitive control, second operating mode with rapid response) within a single integrated control system. Each mode is optimized for different processing requirements - delicate processing versus rapid cutting. The control device automatically or manually switches between modes based on the processing task, providing universal adaptability without requiring separate devices for each function.
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
The device provides sensitive and efficient cutting capabilities, allowing for easy handling of different materials, such as wood, grass, and metal, while maintaining user-friendliness and high performance.
Implementation Method 1
an electric drive motor (3), in particular a brushless direct current motor (3), in particular a permanent magnet synchronous motor (3)
Data Source
AI summary
A hand-portable garden, forestry and/or construction processing device has a cutting tool, an electric drive motor, a motor operating element, and a control device. The cutting tool is designed for cutting through work. The drive motor is designed for driving the cutting tool. The motor operating element is user-adjustable over an adjustment range from a minimum setting to a maximum setting. The control device is designed for controlling a target speed of the drive motor in accordance with a setting of the motor operating element in at least one first operating mode and one second operating mode. In the first operating mode, the target speed increases over at least one segment from a minimum of 0.5 times the adjustment range as the setting increases, wherein the increase changes over the segment by a maximum of 60%. In the second operating mode, the target speed is a minimum of 0.9 times a maximum target speed of the second operating mode as the setting increases from a maximum of 50% of the adjustment range.