Suction Device with Motor-Synchronized Fan Control
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Solution Overview
Problem
Existing suction devices for hand-held power drills are not easily attachable and detachable without tools and often require additional circuits or user-activated switches, which complicates their integration with hand-held power tools.
Innovation Solution
A modular suction device with a housing that locks onto a hand-held power drill, featuring a sensor to detect the operating state of the drill's electric motor and activate a fan motor automatically, eliminating the need for additional circuits or user-activated switches, using a magnetic field sensor and a transducer coil to ensure reliable operation under various drilling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a suction device is designed to be easily attachable and detachable without tools, then the ease of operation is improved, but the reliability of connection may worsen
Solution Approach 1:
The locking device incorporates a spring element that provides automatic engagement and disengagement functionality. The spring-loaded mechanism allows the suction device to be quickly attached by pushing it onto the power tool, where it automatically locks into place, and easily removed by pressing a release mechanism. This dynamic system maintains reliable connection during operation while enabling tool-free attachment and detachment.
2Extent of automation
If additional circuits or switch elements are added to the suction device, then the automation of fan motor activation is improved, but the device complexity increases
Solution Approach 1:
The sensor system automatically detects when the power tool's electric motor is rotating and autonomously activates the fan motor without requiring any user intervention or additional control circuits. The sensor monitors the motor's operational state and directly controls the fan motor's power supply, enabling the suction device to self-regulate based on the drilling activity, thereby achieving automation without increasing device complexity.
Solution Approach 2:
The invention replaces mechanical switch elements with a sensor-based detection system that uses electromagnetic or optical sensing to detect the power tool motor's rotation. This substitution eliminates the need for complex mechanical switches, buttons, or additional control circuits, achieving automatic fan motor activation through a simpler, more reliable sensing mechanism that directly interfaces with the power tool's operational state.
3Extent of automation
If a sensor is used to detect the magnetic field of the electric motor, then the automation control is improved, but the sensitivity to interfering signals may worsen
Solution Approach 1:
The sensor system continuously monitors the magnetic field generated by the power tool's electric motor and provides feedback to the control mechanism. The system distinguishes between the characteristic magnetic field pattern of the motor during rotation and interfering signals by analyzing the frequency, amplitude, and temporal characteristics of the detected field. This feedback mechanism ensures accurate automatic control while filtering out false signals from the rough operating environment of drilling operations.
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 easy attachment and detachment of the suction device without tools, automatically activating and deactivating the fan motor based on the drill's operation state, ensuring efficient dust collection without additional hardware or user intervention, even under rough drilling conditions.
Implementation Method 1
The sensor detects a magnetic field generated by the electric motor and activates the control mechanism of the fan motor when the strength of the magnetic field exceeds a threshold value
Implementation Method 2
The sensor is able to detect an alternating magnetic field produced by the electric motor and to supply the signal of the sensor to a high pass filter
Data Source
AI summary
A suction device with a hand-held power drill is disclosed. The suction device has a housing and a locking mechanism for fastening the housing to a housing of the hand-held power drill. The suction device furthermore has a fan motor and a controller for the fan motor. The controller contains a sensor for detecting the operating state of an electric motor of the hand-held power tool. The controller is configured to activate the fan motor when the electric motor is in a rotating state of operation.