Brushless Cutting Tool Motor Heat Management via Liquid Cooling
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Solution Overview
Problem
Cutting tools in the related art are bulky and have electric motors that are not conducive to long-time operation due to inefficiencies in power delivery and heat management, which affects their performance and durability.
Innovation Solution
A cutting tool design featuring a brushless electric motor with a rotational speed of at least 7000 revolutions per minute, a liquid storage system, and a control mechanism that manages airflow and liquid flow to enhance heat dissipation and operational efficiency, along with a compact structure for improved handling and balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a traditional electric motor is used in cutting tools, then the device can perform cutting operations, but the motor is not conducive to long-time operation due to inefficiencies in power delivery and heat management
Solution Approach 1:
The patent replaces the traditional mechanical motor system with a brushless motor system that uses electronic commutation instead of mechanical brushes. This substitution eliminates the wear and heat generation associated with mechanical contact, enabling long-time operation while maintaining reliable power delivery. The brushless motor with electronic control provides continuous operation capability without the limitations of traditional motor designs.
2Productivity
If cutting tools are designed with adequate power delivery and heat management systems, then operational efficiency improves, but the device becomes bulky
Solution Approach 1:
The patent merges the motor, transmission mechanism, and heat management functions into a compact integrated housing structure. The housing serves multiple functions: it contains the brushless motor, provides structural support for the transmission mechanism, and incorporates heat dissipation pathways. This consolidation eliminates the need for separate bulky components while maintaining adequate power delivery and heat management, thus improving cutting efficiency without increasing overall device volume.
Solution Approach 2:
The patent changes the operational parameters of the motor system by using a brushless motor capable of operating at high rotational speeds (at least 7000 revolutions per minute). This parameter change allows for more compact design because the higher speed motor can deliver the same cutting power in a smaller package, reducing the volume required for power delivery components while maintaining cutting efficiency.
3Productivity
If the motor rotational speed is increased to at least 7000 revolutions per minute, then cutting efficiency improves, but heat generation increases
Solution Approach 1:
The patent converts the harmful heat generated by high-speed motor operation into a manageable thermal flow by incorporating dedicated heat dissipation pathways in the housing. The housing structure includes thermal conduction paths and convection channels that redirect the heat away from critical components. This approach transforms the heat problem into a controlled thermal management system, allowing the motor to operate at high speeds (7000+ rpm) for improved cutting efficiency while preventing overheating through systematic heat evacuation.
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 cutting tool achieves improved cutting efficiency, reduced size for easier handling, and enhanced durability through effective heat management and power delivery, enabling longer operation times and better performance.
Implementation Method 1
The electric motor is a brushless motor, where a rotational speed of the electric motor is not lower than 7000 revolutions per minute
Implementation Method 2
a liquid storage system including a liquid storage device configured to store a liquid
Implementation Method 3
a control mechanism that manages airflow and liquid flow to enhance heat dissipation
Data Source
AI summary
A cutting tool includes an electric motor supported by a housing, an accessory mounting portion including an output member connected to a saw blade, a transmission mechanism connecting the electric motor to the output member, a base plate disposed at the bottom of the housing and having a mounting hole for the saw blade to pass through, a battery pack interface configured to be detachably connected to a battery pack, a liquid storage system including a liquid storage device configured to store a liquid and detachably mounted on the housing, and a system control member disposed on a liquid flow path of the liquid storage system and used for controlling the flow state of the liquid in the liquid storage device. The electric motor is a brushless motor, and a rotational speed of the electric motor is not lower than 7000 revolutions per minute.