Non-Contact Speed Selector Switch for Reliable Rotary Tool Control
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Solution Overview
Problem
Existing rotary power tools lack an efficient and non-contact method for adjusting the rotational speed of the motor, relying on traditional switch mechanisms that may be cumbersome and prone to electrical contact issues.
Innovation Solution
The integration of a non-contact speed selector switch, utilizing a Hall-effect sensor and a magnetically actuated shuttle body, allows for the adjustment of rotational speed without physical contact, enhancing user convenience and reducing the risk of electrical failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional contact-based switch mechanism is used for speed adjustment, then the device structure is simple and easy to manufacture, but the reliability deteriorates due to electrical contact issues and the ease of operation worsens due to cumbersome switching
Solution Approach 1:
The patent replaces the traditional mechanical contact-based switch with a non-contact Hall effect sensor system. The Hall effect sensor detects the position of a magnetically actuated shuttle body to determine speed settings without physical or electrical contact, eliminating contact wear and electrical failure issues while maintaining functional complexity through magnetic field-based detection
Solution Approach 2:
The patent introduces a magnetically actuated shuttle body as an intermediary between the user input and the Hall effect sensor. This shuttle body carries magnets that interact with the Hall effect sensor to transmit speed selection information without direct contact, serving as a magnetic mediator that enables non-contact signal transmission
2Ease of operation
If a non-contact speed selector switch using Hall-effect sensor is used, then the reliability improves and ease of operation improves, but the device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical contact switches with a Hall effect sensor-based non-contact detection system. The Hall effect sensor detects magnetic field changes from the shuttle body's position to determine speed settings, providing smooth and intuitive operation without mechanical resistance or contact issues
Solution Approach 2:
The Hall effect sensor system provides automatic detection of the shuttle body position based on magnetic field changes. The sensor continuously monitors the magnetic field and automatically determines the speed setting without requiring manual switching actions, enhancing operational ease through automatic position recognition
3Reliability
If a non-contact speed selector switch is used, then the reliability improves by eliminating electrical contact issues, but the manufacturing complexity increases
Solution Approach 1:
The patent replaces contact-based electrical switches with non-contact Hall effect sensors and magnetically actuated components. This substitution eliminates electrical contact wear and arcing issues, significantly improving reliability while the modular design of the shuttle body and sensor assembly facilitates standardized manufacturing processes
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (strength, direction, position) to encode speed selection information. The Hall effect sensor detects these magnetic parameter changes to determine the selected speed, enabling reliable non-contact operation while allowing flexible manufacturing through magnetic component integration
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 solution provides a reliable and user-friendly method for adjusting motor speed, improving operational efficiency and safety by eliminating the need for physical contact in the speed adjustment mechanism.
Implementation Method 1
The integration of a non-contact speed selector switch, utilizing a Hall-effect sensor and a magnetically actuated shuttle body
Data Source
AI summary
A rotary power tool includes a housing having a motor housing portion and a handle portion extending therefrom. An electric motor is positioned within the motor housing portion. The rotary power tool further includes a trigger switch configured to activate and deactivate the motor. The rotary power tool further includes a non-contact speed selector switch that is separate from the trigger switch and configured to adjust a rotational speed of the motor. The non-contact speed selector switch is positioned in a foot of the handle portion opposite the motor housing portion.