Motor Heat Dissipation via Wind-Catching Projections
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Solution Overview
Problem
Motors used in emergency repair kits face heat accumulation issues, leading to reduced performance and risk of short circuits due to inefficient heat dissipation, especially when operated at higher speeds to quickly repair punctured tires.
Innovation Solution
A motor design featuring a cylindrical housing with a cover having wind-catching projections that guide airflow induced by a cooling fan to enter and exit the housing through specific holes, facilitating effective heat dissipation and preventing heat accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor is operated at higher speed to quickly repair punctured tires, then productivity is improved, but heat accumulation increases causing performance reduction and potential short circuits
Solution Approach 1:
The housing is segmented into multiple cooling channels with upstream through-holes and downstream through-holes, creating separate airflow paths that efficiently distribute cooling air to different regions of the motor, including the armature core and brush unit areas
Solution Approach 2:
A cooling fan is introduced as an intermediary device to generate forced airflow that passes through the cooling channels in the housing, actively removing heat from the motor components during high-speed operation
2Temperature
If a cooling fan is installed to dissipate heat, then temperature control is improved, but airflow only flows along the outer surface of the housing leaving internal heat accumulation unresolved
Solution Approach 1:
The housing is divided into multiple cooling channels with upstream through-holes positioned to direct airflow toward internal components such as the armature core and brush unit, ensuring that cooling air reaches heat-generating areas inside the motor rather than just the outer surface
Solution Approach 2:
The cooling system transitions from two-dimensional surface cooling to three-dimensional internal cooling by creating vertical airflow paths through the housing thickness, with air entering through upstream holes, flowing through internal channels, and exiting through downstream holes to cool components in multiple spatial dimensions
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 enhances the motor's performance and service life by ensuring efficient heat dissipation, reducing the risk of damage from heat accumulation and extending operational reliability.
Implementation Method 1
a cooling fan (4), mounted at one end of a rotating shaft of the rotor assembly, near the cover... the airflow induced by the cooling fan can easily pass through the air guiding channels (214) and the upstream through holes (10) to enter the housing
Implementation Method 2
The cover (2) is provided with a plurality of wind-catching projections (21) around its circumference... Each wind-catching projection (21) is a bulging layer which has a roof (211) and two slant walls (212, 213)... so that an air guiding channel (214) is defined between the roof (211), the two slant walls (212, 213), and the circumference of the cover (2)
Implementation Method 3
the airflow induced by the cooling fan can easily pass through the air guiding channels (214) and the upstream through holes (10) to enter the housing, and can go out of the housing via the downstream through holes (103) to take away the heat generated in the motor
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A motor includes a substantially cylindrical housing, a rotor assembly, a cover, and a cooling fan. The cooling fan is installed at one end of a rotating shaft of the rotor assembly to induce airflow. The cover, which is mounted to the housing, is provided with a plurality of wind-caching projections, each of which is located above one upstream through hole defined on the housing and faces towards the cooling fan. The wind-catching projections can receive the airflow induced by the cooling fan and guides the airflow to enter the housing via the upstream through holes to dissipate the heat accumulated in the motor, so that the motor can be prevented from damages due to heat accumulation. Therefore, the performance and service life of the motor can be increased.