Load-Adaptive Motor Control in Percussion Tools for Lower Vibration
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Solution Overview
Problem
Percussion tools face challenges in effectively reducing vibrations during both loaded and no-load conditions, which can lead to operator discomfort and tool inefficiency.
Innovation Solution
A percussion tool with a brushless electric motor, a battery pack, and an electronic controller that adjusts motor speed based on load conditions, using a predetermined profile during loaded conditions and reduced speed during no-load conditions to minimize vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor operates at high speed during no-load conditions, then productivity is improved, but vibrations increase causing operator discomfort
Solution Approach 1:
The electronic controller dynamically adjusts motor speed based on real-time load detection. During no-load conditions, the motor operates at reduced speed to minimize vibrations, while during loaded conditions, it automatically increases speed to maintain productivity. This dynamic speed adjustment resolves the contradiction between productivity and vibration reduction.
Solution Approach 2:
The system incorporates load detection feedback mechanisms that continuously monitor the operational state of the percussion tool. The electronic controller receives feedback about load conditions and automatically adjusts motor speed accordingly, creating a closed-loop control system that balances productivity and vibration control based on actual operating conditions.
2Power
If the motor operates at high speed during no-load conditions, then energy output is improved, but energy waste increases
Solution Approach 1:
The motor speed is dynamically adjusted based on load conditions. During no-load conditions, the motor operates at reduced speed to minimize energy consumption, while during loaded conditions, it automatically increases speed to deliver required power output. This dynamic adjustment eliminates energy waste during idle periods while maintaining power availability when needed.
Solution Approach 2:
The system changes the operational parameters of the motor based on load detection. The electronic controller modifies motor speed as a variable parameter, reducing it during no-load conditions to decrease energy consumption, and increasing it during loaded conditions to maintain power output requirements.
3Object-affected harmful factors
If vibration reduction systems are added to the percussion tool, then operator comfort is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical vibration reduction systems with an electronic control system that adjusts motor speed. Instead of adding mechanical dampers or balance weights, the system uses electronic sensors and controllers to detect load conditions and adjust motor operation, achieving vibration reduction through electronic means rather than mechanical additions.
Solution Approach 2:
The vibration reduction function is integrated into the existing motor control system. The electronic controller that already manages motor operation also performs load detection and automatic speed adjustment for vibration control, eliminating the need for separate dedicated vibration reduction components and reducing overall system complexity.
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 solution significantly reduces vibrations, enhancing operator comfort and tool efficiency by dynamically adjusting motor speed according to load conditions, thereby improving overall performance.
Implementation Method 1
a battery pack removably coupled to the housing for providing power to the electric motor when coupled to the housing
Implementation Method 2
the electronic controller is coupled to the electric motor and configured to activate the motor and determine whether the percussion tool is in a loaded condition
Implementation Method 3
an electric motor positioned within the housing... a percussion mechanism driven by the electric motor
Data Source
AI summary
A method for reducing vibrations in a percussion tool includes activating, using an electronic controller of the percussion tool, the motor of the percussion tool, determining, using the electronic controller, that the percussion tool is in a loaded condition, and operating, using the electronic controller, the motor in accordance with a predetermined profile in response to determining that the percussion tool is in the loaded condition. The method also includes determining, using the electronic controller, that the percussion tool is in a no-load condition and operating, using the electronic controller, the motor with reduced speed in response to determining that the percussion tool is in the no-load condition.