Cut-Off Saw Airflow Layout for Battery and Motor Cooling
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Solution Overview
Problem
Cut-off saws face challenges in effectively cooling their components, such as battery packs and control electronics, leading to potential overheating during intense usage, and they often struggle with dust and debris management, affecting user experience and tool performance.
Innovation Solution
The design incorporates a brushless electric motor, a battery pack, and a printed circuit board assembly within a saw housing that utilizes specific air flow paths for cooling, including rear-facing air inlet openings and side-facing air outlet openings, creating a direct cooling air flow that circulates around the battery pack and motor, while also employing a belt-free direct-drive blade system and an auxiliary handle for improved ergonomics and dust management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If increased cooling is provided for components in the saw housing, then the temperature of battery pack and motor is reduced, but the device complexity increases
Solution Approach 1:
The cooling system merges multiple functions into a single integrated air flow path. The same air flow that cools the battery pack also cools the motor and control electronics through strategic placement of inlet and outlet openings, eliminating the need for separate cooling systems for each component.
Solution Approach 2:
The cooling air flow serves multiple purposes simultaneously: it cools the battery pack, cools the motor, cools the control electronics, and creates an air curtain to manage dust and debris. This multi-functionality reduces overall system complexity while addressing multiple thermal and environmental challenges.
2Object-affected harmful factors
If air outlet openings direct high volume of air outward to create air curtain, then dust and debris are pushed away from user, but the energy consumption increases
Solution Approach 1:
The system uses the motor's own operation to generate the air flow needed for cooling and dust management. The motor-driven fan creates the air curtain effect without requiring an additional dedicated fan or energy-consuming mechanism, as the air flow is a byproduct of the cooling system designed for thermal management.
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 configuration enhances cooling efficiency for the battery pack, motor, and control electronics, reducing the risk of overheating and improves user experience by creating an air curtain that pushes dust and debris away from the cutting area, enhancing visibility and tool performance.
Implementation Method 1
the motor and a motor driven fan draw cooling air flow through the rear air intake openings. The cooling air flow follows a first cooling air flow path that enters the battery compartment and flows around all sides of the battery pack within the battery compartment. Upon exiting the battery compartment, the first cooling air flow path passes over the PCBA and an adjoining heat sink, and then passes through the motor.
Implementation Method 2
the first cooling air flow path passes over the PCBA and an adjoining heat sink
Implementation Method 3
the air outlet openings direct a high volume of air outward from the housing in a lateral and forward direction, providing an air curtain that pushes cutting dust and debris away from the user and the front of the cut-off saw
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A cut-off saw housing (2) includes features that define cooling air flow paths through the saw housing that are configured to cool the battery pack (116), the saw electronics (118) and the saw electric motor (101). The first cooling path (108) passes through a compartment (18(1)) that houses the battery and cools the battery before exiting the saw housing (2). The second cooling path (110) passes below the compartment (18(1)) and through a heat sink of a printed circuit board assembly (112) before exiting the saw housing (2). Both the first and second cooling paths (108, 110) pass through the electric motor (101) before exiting the saw housing (2).