Pole Sander Electronics Cooling Through Conductive Tube Housing
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Solution Overview
Problem
Existing pole sanders face challenges in effectively managing heat generated by control electronics when driving brushless electric motors, which can lead to temperature issues affecting the motor's performance.
Innovation Solution
The handheld pole sander incorporates a design where the control electronics are mounted in a heat conductive housing within the rear housing, allowing heat to be transferred to an aluminum tube, and air flow from a vacuum cleaner helps in cooling, ensuring the control electronics operate within a working temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If control electronics are mounted in the rear housing, then the device structure is simplified, but heat accumulation occurs affecting motor performance
Solution Approach 1:
A heat conductive housing is introduced as an intermediary component between the control electronics and the aluminum tube. The housing has a heat conductive portion that contacts the control electronics and transfers heat to the aluminum tube, which then dissipates heat through air flow from the vacuum cleaner.
Solution Approach 2:
The cooling system utilizes air flow from the vacuum cleaner as a pneumatic cooling mechanism. The air flow passes through or around the aluminum tube, carrying away heat from the control electronics via convection, thus maintaining operational temperature without requiring additional active cooling components.
2Use of energy by moving object
If brushless electric motor is used, then motor efficiency is improved, but heat generation from control electronics increases
Solution Approach 1:
The heat generated by the control electronics, which is a harmful byproduct of efficient brushless motor operation, is converted into a manageable thermal flow. The heat conductive housing and aluminum tube channel this heat away, and the vacuum cleaner's air flow further dissipates it, turning the harmful heat accumulation into a controlled thermal management process.
Solution Approach 2:
The heat conductive housing acts as a mediator between the efficient but heat-generating control electronics and the cooling air flow. It facilitates thermal transfer while allowing the electronics to maintain their efficient operation without direct thermal interference.
3Volume of moving object
If control electronics are mounted inside the rear housing, then device compactness is improved, but heat dissipation becomes difficult
Solution Approach 1:
The heat conductive housing is nested within the rear housing structure, and the aluminum tube is integrated within the same housing. This nested arrangement allows thermal management components to be embedded within the existing device volume, maintaining compactness while providing effective heat dissipation pathways through the housing walls.
Solution Approach 2:
The heat conductive housing serves as an intermediary thermal pathway embedded within the compact rear housing. It provides a dedicated heat transfer route from the control electronics to the external environment without requiring additional external components, thus maintaining device compactness.
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 solution effectively manages heat generated by the control electronics, maintaining their temperature within a working range and ensuring efficient operation of the brushless motor.
Implementation Method 1
the control electronics are mounted in a heat conductive housing within the rear housing, allowing heat to be transferred to an aluminum tube
Implementation Method 2
air flow from a vacuum cleaner helps in cooling, ensuring the control electronics operate within a working temperature range
Data Source
Figure 1~3
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AI summary
A handheld pole sander for for performing different surface machining treatments including but not limited to sanding, polishing, grinding or rubbing a work surface comprising: an elongate body (102) having two ends; a sanding head (100) attached via a pivot mechanism (110) to a first end of the elongate body (102); an electric motor (114) mounted on the sander, the electric motor (114) being electrically controlled by control electronics (144) which provides electronic control signals to activate the motor (114); control electronics (144) mounted on the sander wherein the sanding head (100) comprises: a hood (112); an output spindle (118) which projects from the hood (112); wherein the electric motor (114), when activated, rotatingly drives the output spindle (118); wherein at least part of the elongate body (102) is made from heat conductive material; characterised in that the control electronics (144) is mounted on the elongate body adjacent the part of the elongate body made from heat conductive material. The heat conductive part of the elongate body (102) can be made at least in part from aluminium tubing, the control electronics (144) being mounted adjacent the aluminium tubing.