Power Tool Cooling Layout With Separate Motor and PCB Air Paths
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Solution Overview
Problem
Existing power tools, particularly lithium battery-powered tools, face inefficiencies in heat dissipation due to shared cooling ducts for motors and circuit boards, leading to reduced battery life and potential damage from overheating.
Innovation Solution
The power tool design includes separate heat dissipation air paths for the motor and circuit board, with distinct air inlets and outlets, and a partition to prevent heat exchange between them, enhancing cooling efficiency and protecting components from each other's temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shared cooling duct is used for both motor and circuit board, then the device complexity is reduced, but the cooling efficiency deteriorates and temperature rise of one component affects the other
Solution Approach 1:
The patent divides the shared cooling duct into separate cooling paths for the motor and circuit board. The housing is segmented into a motor housing and a circuit board housing, each with dedicated air inlets and outlets, preventing thermal interference while maintaining manageable structural complexity through modular design.
2Area of stationary object
If airflow passes successively through multiple heat-generating components, then the cooling coverage is improved, but the cooling efficiency deteriorates
Solution Approach 1:
The patent implements separate cooling air paths for the motor and circuit board, with independent air inlets and outlets for each component. This segmentation prevents heated air from one component from entering the cooling path of another, maintaining high cooling efficiency while still providing comprehensive thermal management coverage.
3Productivity
If the first air inlet is disposed between the air outlet and the second air inlet, then the motor cooling path is shortened improving heat dissipation, but the circuit board may be affected by motor heat
Solution Approach 1:
The patent segments the housing into distinct motor housing and circuit board housing portions with physically separated cooling pathways. The motor air inlet is positioned on the motor housing while the circuit board air inlet is on the circuit board housing, ensuring that even though the motor cooling path is optimized for heat dissipation, thermal interference is prevented through structural segmentation and isolated airflow paths.
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 design improves cooling efficiency, reduces the risk of component failure, and effectively manages temperature to extend battery life and prevent damage, while minimizing interference between the motor and circuit board.
Implementation Method 1
a fan, a motor, and a circuit board that are received in the housing... the power tool includes a first heat dissipation air path that flows through the motor and a second heat dissipation air path that flows through the circuit board, formed by a rotation of the fan
Data Source
AI summary
A power tool, including: a housing, extending in a longitudinal direction; and a fan, a motor, and a circuit board that are received in the housing. The housing defines an air outlet, a first air inlet, and a second air inlet. The first air inlet is adjacent to the motor, and the second air inlet is adjacent to the circuit board; the first air inlet is disposed between the air outlet and the second air inlet. The power tool includes a first heat dissipation air path that flows through the motor and a second heat dissipation air path that flows through the circuit board. The motor includes an output shaft extending along the longitudinal direction. The output shaft is connected to the fan; the air outlet, the fan, the first air inlet, and the second air inlet are arranged sequentially in an axis direction of the output shaft.