Motor-Fan Assembly Vent Layout for Cooling and Noise Reduction
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Solution Overview
Problem
Current motor-fan assemblies face challenges with inadequate cooling airflow, leading to thermal shutdowns and reduced operational performance, as well as noise issues due to sharp vent edges and contamination ingress, with limited adaptability and inefficiency in heat dissipation and noise reduction.
Innovation Solution
The motor-fan assembly incorporates a housing assembly with reverse motor cooling airflow and replaceable inserts for ambient or filtered air, featuring a blower housing with strategically positioned vents and a motor cover to enhance airflow and noise reduction, isolating the working fan assembly from the motor section to prevent heat migration and using deflectors to reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling fan flows air over the electronics through axial vents, then the electronics are cooled, but noise permeates outwardly with little impediment and contaminants can enter the cooling air intake
Solution Approach 1:
The patent inverts the traditional axial vent configuration by implementing radial vents that extend perpendicular to the fan axis. This inversion changes the airflow path from axial to radial direction, allowing cooling air to enter through radial vents, flow axially through the electronics, and exit through different radial vents on the opposite side of the housing. This configuration reduces noise by directing airflow away from sharp edges and prevents contaminant ingress by positioning vents away from the fan intake path.
Solution Approach 2:
The patent introduces an intermediary cooling air path that is physically separated from the working air path. The cooling air intake vents and cooling air outlet vents create a dedicated cooling circuit that does not mix with the working air intake and outlet. This intermediary path allows cooling function to be performed independently while preventing contaminant transfer between working air and cooling air streams.
2Object-affected harmful factors
If filters are added to the cooling air vents to prevent contaminant ingress, then contamination is reduced, but cooling airflow is reduced which may lead to overheating
Solution Approach 1:
Instead of filtering cooling air through the same axial vents used for cooling, the patent inverts the approach by creating separate radial vents for cooling air intake and outlet. The cooling air path is inverted to flow radially through the housing walls rather than axially through the fan assembly, eliminating the need for filters in the cooling path while maintaining effective cooling.
Solution Approach 2:
The patent segments the air handling system into distinct working air pathways and cooling air pathways. The cooling air vents are separated from the working air vents, with cooling air entering through radial intake vents, flowing through the electronics, and exiting through radial outlet vents on the opposite side. This segmentation allows each pathway to be optimized independently without compromising the other.
3Volume of moving object
If the motor assembly and working fan assembly are positioned close together to reduce size, then device compactness is improved, but heat migrates from the working fan assembly to the motor section
Solution Approach 1:
The patent introduces an intermediary cooling air flow that acts as a thermal barrier between the working fan assembly and motor section. Cooling air flows radially through the housing walls, creating a cooling channel that prevents heat migration from the working fan assembly to the motor section. This intermediary cooling path maintains thermal separation while allowing compact positioning of components.
Solution Approach 2:
The patent extracts the cooling function from the internal motor assembly and relocates it to the housing walls. The cooling air intake vents and outlet vents are positioned in the housing walls rather than in the motor assembly itself. This extraction allows the motor assembly to remain compact while the housing provides the cooling function, preventing heat migration through the housing structure.
4Ease of manufacture
If axial vents are used for cooling air intake and outlet, then cooling airflow is simple to implement, but noise is generated due to sharp edges and contaminants can enter
Solution Approach 1:
The patent inverts the traditional axial vent configuration by implementing radial vents that extend perpendicular to the fan axis. This inversion changes the airflow path from axial to radial direction, allowing cooling air to enter through radial vents, flow axially through the electronics, and exit through different radial vents on the opposite side of the housing. This configuration reduces noise by directing airflow away from sharp edges and prevents contaminant ingress by positioning vents away from the fan intake path.
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 improves cooling airflow, reduces noise, and extends motor life by effectively routing cooling air through the motor assembly, while the replaceable inserts allow for adaptable filtration and noise reduction, enhancing overall motor-fan assembly performance.
Implementation Method 1
Rotation of the cooling fan draws cooling air into the blower housing through the cooling air inlet for the purpose of cooling the motor assembly
Implementation Method 2
The cooling airflow then exits through the outlet. Rotation of the cooling fan draws cooling air into the blower housing through the cooling air inlet for the purpose of cooling the stator, its associated windings, and the circuit board
Data Source
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AI summary
A motor-fan assembly includes a working fan assembly (104) having at least one working fan and a blower housing (106) coupled to the working fan assembly (104). The blower housing (106) provides a blower housing chamber (174) and a cooling air inlet that draws cooling air into the blower housing chamber (174). A motor assembly (110) is carried by the blower housing (106) and rotates a shaft connected to the at least one working fan. The motor-fan assembly (104) also includes a cooling fan assembly (116) with at least one cooling fan connected to an end of the shaft opposite the at least one working fan. A motor vent cover (118) encloses the cooling fan assembly (116) and includes a cooling air outlet. Rotation of the at least one cooling fan draws cooling air in through the cooling air inlet, through the motor assembly (110), and exhausts cooling airflow through the cooling air outlet.