Power Tool Motor Control for Variable Battery Pack Ratings
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Solution Overview
Problem
Power tools with detachable power sources face issues due to compatibility with various capacities and voltage ratings, leading to short working times or safety risks such as overtemperature events.
Innovation Solution
A power tool with a power controller that retrieves information about the detachable power source via data contacts or sensors, controlling the motor to operate in multiple modes based on the retrieved data to optimize performance and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a user selects a smaller capacity battery pack with smaller footprint and lower weight, then portability is improved, but working time is reduced
Solution Approach 1:
The power controller dynamically adjusts motor operating modes based on the detected battery capacity. When a smaller capacity battery is detected, the controller adapts by selecting appropriate power modes that extend working time, effectively making the system's behavior dynamic rather than fixed.
Solution Approach 2:
The system changes operational parameters (motor power modes) based on the battery capacity parameter. The power controller retrieves battery information and adjusts motor operating parameters accordingly, allowing the same battery to achieve optimal working time through parameter adaptation.
2Ease of operation
If a user selects an incorrect power supply lead with inappropriate voltage/power rating, then ease of connection is improved, but safety is compromised due to overloading and overtemperature
Solution Approach 1:
The power controller retrieves information about the connected power source through data contacts and uses this feedback to determine appropriate operating modes. This feedback mechanism prevents unsafe operation by automatically adapting to the connected power source's capabilities.
Solution Approach 2:
The system performs preliminary detection of power source characteristics before motor operation begins. By retrieving power source information in advance and determining suitable operating modes beforehand, the system prevents safety issues before they can occur.
3Adaptability or versatility
If a power tool is designed to accept various detachable power sources with different capacities and voltage ratings, then adaptability is improved, but risk of overloading and overtemperature events increases
Solution Approach 1:
The power controller is designed to universally accept multiple power source types (batteries and power leads) with different capacities and voltage ratings. Through multi-functionality, the same controller can detect and adapt to various power sources, maintaining safety across different configurations.
Solution Approach 2:
The system changes motor operating parameters based on the detected power source characteristics. By adjusting power modes according to the connected power source's capacity and voltage rating, the system maintains safe operation across all compatible power sources.
4Reliability
If the power controller retrieves and processes information about the detachable power source, then safety and efficiency are improved, but device complexity increases
Solution Approach 1:
The power controller automatically retrieves power source information and determines appropriate operating modes without user intervention. The system serves itself by autonomously detecting power source characteristics and configuring optimal operation, reducing the need for complex user interfaces or manual settings.
Data Source
AI summary
A power tool comprises a working component, a motor for driving the working component, a power source connector and a power controller for controlling the motor, where the power controller is configured to retrieve information about a detachable power source connected to the power source connector, and control the motor to operate in one of a plurality of different modes according to the retrieved information of the detachable power source.