Fan Motor Cooling via Integrated Second Vane Heat Dissipation
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Solution Overview
Problem
Fan motors operating at high speeds face efficiency decreases due to inadequate heat dissipation, particularly in small and lightweight designs, where the stator's heat is not easily released, leading to increased temperatures and reduced motor performance.
Innovation Solution
A fan motor design featuring a simple internal structure with a bent flow path minimization using a first vane to guide air flow and a second vane in contact with the stator, incorporating heat dissipation fins that transfer heat to the housing, enhancing cooling efficiency by directing air flow and increasing the heat exchange area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the motor size and weight are reduced for portability, then the heat dissipation area is reduced, but the motor efficiency decreases due to inadequate heat dissipation
Solution Approach 1:
The patent combines the cooling function with the existing housing structure by making the second vane an integral part of the housing. The second vane serves dual purposes: guiding air flow and providing heat dissipation surface area, eliminating the need for separate cooling components while maintaining motor efficiency in a compact design
Solution Approach 2:
The patent utilizes the axial dimension by extending the second vane along the axial direction of the rotating shaft. This creates additional heat dissipation surface area in the axial dimension without increasing the radial size of the motor, allowing effective cooling while maintaining a compact overall footprint
2Temperature
If a separate cooling component is added to cool the bearing, then the bearing cooling is improved, but the device complexity increases and stator cooling becomes difficult
Solution Approach 1:
The second vane is designed as a multi-functional component that simultaneously cools both the bearing and the stator. Air flow guided by the second vane passes through bearing cooling holes to cool the bearing, then continues to flow around the stator to cool it as well, eliminating the need for separate cooling systems for each component
Solution Approach 2:
The patent merges the bearing cooling function with the stator cooling function into a single integrated air flow path. The second vane creates a unified cooling system where one air flow serves multiple cooling purposes, simplifying the overall motor structure while effectively cooling both the bearing and stator
3Device complexity
If air flow cooling is used for the stator, then the structure is simple, but heat generated in the stator is not easily released at high speeds
Solution Approach 1:
The second vane is positioned and configured to pre-direct air flow toward the stator before the air reaches it. By preliminarily orienting the air flow path through the second vane's geometry, the system ensures that cooling air is already directed toward the stator surface, enhancing heat release efficiency even at high rotation speeds where cooling demands are greatest
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 effectively reduces temperature increases in the stator and rotor, improving motor efficiency by up to 20-30°C and maintaining performance even at high speeds of 100,000 rpm, while also reducing the motor's size and weight.
Implementation Method 1
a second vane coupled to the stator and disposed downstream relative to the first vane in a flow direction of the flow of air. The second vane is in contact with at least a part of an inner surface of the housing.
Implementation Method 2
an impeller rotatably disposed at the rotating shaft, a first vane disposed adjacent to the impeller and configured to guide a flow of air generated by the impeller
Implementation Method 3
a rotor disposed at the rotating shaft and spaced apart from the impeller in an axial direction of the rotating shaft, a stator that is disposed in the housing and surrounds the rotor
Data Source
AI summary
A fan motor includes a housing, a rotating shaft that is rotatably disposed in the housing and extends through the housing, an impeller rotatably disposed at the rotating shaft, a first vane disposed adjacent to the impeller and configured to guide a flow of air generated by the impeller, a rotor disposed at the rotating shaft and spaced apart from the impeller in an axial direction of the rotating shaft, a stator that is disposed in the housing and surrounds the rotor, the stator and the rotor defining an air gap therebetween, and a second vane coupled to the stator and disposed downstream relative to the first vane in a flow direction of the flow of air. The second vane is in contact with at least a part of an inner surface of the housing.