Magnetic Control Mechanism for Electric Power Tool Speed
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Solution Overview
Problem
Conventional electric power tools lack precise control over output power and rotational speed, particularly in applications requiring fine adjustments for tasks like grinding, polishing, and cutting, due to complex and limited staged control structures that are not suitable for delicate fabrication processes.
Innovation Solution
An electric power tool with a manual control mechanism and a magnetic control element that modulates driving power through a power modulation circuit, allowing continuous and controllable adjustments of rotational speed and torque by altering the magnetic field generated by a movable magnetic element in response to user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional staged control structures are used, then the device complexity is reduced, but the manufacturing precision and control precision deteriorate due to limited adjustment stages
Solution Approach 1:
The patent replaces the conventional mechanical staged switch control system with a magnetic control system. A movable magnetic element interacts with a magnetic control element to generate continuous control signals, eliminating the need for complex mechanical switch mechanisms while achieving precise continuous control of motor speed and torque.
Solution Approach 2:
The patent changes the control parameter from discrete staged positions to continuous magnetic field strength variations. By varying the position of the magnetic element continuously, the magnetic field strength changes smoothly, enabling continuous adjustment of motor output power rather than limited staged control.
2Adaptability or versatility
If multi-staged control is implemented, then the adaptability improves, but the device complexity increases due to more switch contacts and mechanisms
Solution Approach 1:
The patent substitutes mechanical multi-stage switch mechanisms with a magnetic control system. The magnetic control element detects the position of the movable magnetic element and generates corresponding control signals, providing multiple control stages through continuous magnetic field variations rather than discrete mechanical switch positions.
Solution Approach 2:
The magnetic control system serves multiple functions: it provides continuous speed control, torque control, and can be adapted to various motor types and power tool applications, replacing multiple specialized mechanical control mechanisms with a single versatile magnetic control system.
3Measurement precision
If conventional switch mechanisms are used, then the ease of manufacture is improved, but the measurement precision and control precision deteriorate due to limited control stages
Solution Approach 1:
The patent replaces complex mechanical switch mechanisms with a magnetic control system that uses magnetic field interactions. This substitution maintains manufacturing simplicity while dramatically improving control precision, as magnetic elements can be precisely positioned and controlled without complex mechanical linkages.
4Ease of operation
If staged control with large differences between stages is used, then the device complexity is reduced, but the ease of operation deteriorates for precise fabrication processes
Solution Approach 1:
The patent changes the control parameter from discrete staged positions to continuous magnetic field strength variations. By varying the position of the magnetic element continuously, the magnetic field strength changes smoothly, enabling continuous adjustment of motor output power rather than limited staged control.
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 precise control over the electric motor's output power, allowing for continuous adjustments of rotational speed and torque, enhancing usability and efficiency in various fabrication processes by providing more nuanced control than traditional ON/OFF or two-stage systems.
Implementation Method 1
The magnetic control element outputs an output control signal in proportion to alterations of a magnetic field caused by movements of the magnetic element
Data Source
AI summary
An electric power tool receives an input power from an electric power source and converts the input power to a driving power to drive an electric motor. The electric power tool further includes a manual control mechanism, a magnetic control element and a power modulation circuit. The manual control mechanism includes a trigger portion movable by depressing of a user and a magnetic element movable with the trigger portion. The magnetic control element outputs an output control signal in proportion to alterations of a magnetic field caused by movements of the magnetic element. The power modulation circuit gets the input power and modulates to the driving power controlled by the output control signal to drive the electric motor. Thus by depressing the trigger portion, output power of the electric motor can be controlled to provide precise control of rotational speed and torque alterations.