Handheld Sanding Tool Cooling Fan Motor Circuit Heat Dissipation
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Solution Overview
Problem
Electric handheld sanding tools face inefficiencies in cooling the electric motor and circuit module, leading to heat accumulation and potential abnormal operation due to the lack of effective heat convection designs, unlike their pneumatic counterparts.
Innovation Solution
An electric handheld sanding tool with a cooling fan positioned between the electric motor and the circuit module, featuring a baseboard with an axial coupling portion, vanes, and an airflow orifice, which synchronizes with the transmission shaft to draw cold airflow and disperse heat through dedicated air inlets and outlets, enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling fan is deployed in the casing to cool the sanding element, then the sanding element cooling is improved, but the electric motor and control module heat accumulation is not effectively addressed
Solution Approach 1:
The patent divides the cooling function into two independent airflow paths: one for cooling the sanding element and another for cooling the electric motor and control module. This segmentation allows each component to be cooled independently without interference, resolving the contradiction between sanding element cooling and motor/module heat management.
Solution Approach 2:
The patent implements localized cooling solutions with dedicated air inlets and outlets positioned near specific heat-generating components. The first air inlet/outlet pair is positioned for sanding element cooling, while the second air inlet/outlet pair is positioned for motor and control module cooling, providing targeted thermal management to different locations.
2Device complexity
If waste heat is not dissipated from the electric motor and control module, then the structure remains simple, but abnormal operation occurs due to heat accumulation
Solution Approach 1:
The patent employs a self-service cooling approach where the electric motor's own rotation drives the cooling fan through direct coupling. This eliminates the need for an independent fan motor or complex control system, keeping the structure simple while ensuring continuous cooling operation that prevents abnormal conditions.
Solution Approach 2:
The patent merges the cooling function with the motor's existing rotational motion by directly coupling the fan to the motor shaft. This integration combines the motor's primary function with the cooling function, eliminating separate cooling components and simplifying the overall structure while maintaining reliability.
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 effectively reduces heat accumulation in the electric motor and circuit module, ensuring optimal operating temperatures and preventing abnormal operations by efficiently dissipating heat generated during use.
Implementation Method 1
the cooling fan is driven by the transmission shaft to draw cold airflow through the air inlet to disperse heat from the electric motor and the circuit module through the air outlet
Implementation Method 2
a plurality of vanes located on the baseboard and centered about the axial coupling portion in a radial fashion... the vanes spin to draw cold airflow through the air inlet to pass through the airflow orifice
Data Source
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AI summary
An electric handheld sanding tool with improved cooling efficiency includes a host body (10) and a sanding assembly (20). The sanding assembly (20) is installed in the host body (10) and includes an electric motor (21), a circuit module (22) and a sanding element (23). The circuit module (22) and the electric motor (21) are interposed by a cooling fan (30) which is synchronously moved with the electric motor (21). The host body (10) has at least one air outlet (112) corresponding to the cooling fan (30) and at least one air inlet (113) corresponding to either of the circuit module (22) and the electric motor (21) such that when the electric motor (21) is driven by the circuit module (22) and drives synchronously the sanding element (23) and the cooling fan (30), the spinning cooling fan (30) draws cold airflow through the air inlet (113) to pass through an airflow orifice (34) and dispel operation heat generated by the electric motor (21) and the circuit module (22) through the air outlet (112).