Power Tool Torque Control via Real-Time Drive Variable Feedback
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Solution Overview
Problem
Users of conventional power tool devices face challenges in accurately setting torque limits for screwing and drilling operations, leading to potential mistakes in achieving desired results, such as correct screwing-in depth, due to variations in processing objects, tools, and screws.
Innovation Solution
The power tool device is designed to detect drive variables like torque during operations and determine a change criterion based on these variables, allowing for automatic adjustment of the rotational drive, such as reducing, stopping, or changing to pulsed operation, to achieve the desired outcome without pre-setting torque limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the user manually sets a torque limit for the power tool device, then the device can stop the working operation at a desired condition, but the user may make mistakes in selecting the torque limit value, resulting in incorrect screwing-in depth or drilling depth
Solution Approach 1:
The power tool device automatically determines the change criterion during the working operation based on detected drive variables, without requiring manual pre-setting by the user. The control unit monitors torque and other drive variables in real-time, automatically identifies when the screw head reaches the desired position (e.g., flush with surface), and stops the operation. This self-service approach eliminates user error in torque limit selection while maintaining precise depth control.
Solution Approach 2:
The control unit continuously detects drive variables (torque, current, speed) during operation and uses this feedback to dynamically determine when to stop the working operation. The system monitors the relationship between drive variables and working condition, automatically adjusting the operation based on real-time feedback rather than relying on pre-set torque limits. This feedback mechanism ensures accurate depth control while simplifying user operation.
2Adaptability or versatility
If the user pre-sets a fixed torque limit, then the device operation can be controlled, but the suitable torque limit varies depending on processing object material, tool type, and screw specifications, making it difficult to achieve desired results across different working conditions
Solution Approach 1:
The control unit dynamically determines the change criterion during the working operation based on real-time detection of drive variables, rather than using a static pre-set torque limit. The system adapts to different processing conditions (materials, tools, screws) automatically by monitoring how drive variables change during operation and identifying the point when the desired working condition is achieved. This dynamic approach provides versatility across different working conditions without requiring complex preconfiguration.
Solution Approach 2:
The power tool device automatically adapts to different processing conditions by detecting drive variables and determining the appropriate stop criterion during operation. The control unit serves itself by autonomously identifying when the screw head reaches the desired position based on torque and other variable patterns, eliminating the need for users to manually configure torque limits for different materials and screw types. This self-adaptation maintains versatility while reducing configuration complexity.
3Reliability
If the power tool device uses automatic detection of drive variables to determine change criterion during operation, then user error is reduced and consistent performance is achieved, but the device requires real-time monitoring and processing of drive variable data
Solution Approach 1:
The control unit implements real-time feedback monitoring of drive variables (torque, current, speed) during the working operation. By continuously detecting these variables and analyzing their relationships, the system reliably determines when the desired working condition is achieved and stops the operation. This feedback-based control enhances reliability by eliminating user error while the control system manages the complexity through automated processing of drive variable data.
Solution Approach 2:
The control unit performs self-service by autonomously monitoring drive variables and determining the stop criterion without requiring external intervention or complex user configuration. The system reliably controls the operation by processing drive variable data internally and automatically identifying when the screw head reaches the desired position, achieving consistent performance across different working conditions while managing control complexity through integrated processing.
Data Source
AI summary
A power tool device, in particular a screwing and/or drilling device, including a drive unit for a rotational driving of a tool, in particular a drill or a screwdriver blade. The power tool device is adapted to detect at least one drive variable (AG) during the rotational driving of the tool, in which the drive variable (AG) is the torque acting on the tool and/or a drive variable associated with this torque, for example an electrical drive variable of the drive unit. The power tool device is adapted to determine a change criterion during the rotational driving of the tool on the basis of the at least one detected drive variable (AG) and to change the rotational driving of the tool in response to the detected drive variable (AG) satisfying the change criterion.