Rotating Electric Machine Cooling Fin Orientation
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Solution Overview
Problem
The existing cooling structure in rotating electric machines, which uses a self-excited fan at the central position with radially extending fins on the end bracket, results in decreased air speed due to ventilation resistance and turbulent flow, making it inefficient to guide cooling air to the motor body.
Innovation Solution
A rotating electric machine design featuring a housing with cooling fins extending towards the output shaft, an end bracket with angled cooling fins on the outer surface, and a fan cover that directs turning cooling air from a separately excited fan to the housing side, ensuring minimal gaps between fins for improved airflow and reduced turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a self-excited fan is used at the central position with radially extending fins on the end bracket, then the cooling structure is simple and symmetric, but the cooling air speed decreases due to ventilation resistance and turbulent flow
Solution Approach 1:
The patent changes the symmetric radial arrangement of fins to an asymmetric arrangement where fins are disposed at specific angles along the air flow direction. The fan is positioned off-center, and fins are arranged with different angles on different sides, creating an asymmetric structure that reduces turbulence and improves air flow speed while maintaining cooling effectiveness.
Solution Approach 2:
The patent introduces dynamic optimization of the fin angles and positions to match the turning flow pattern of cooling air from the fan. The fin angles are specifically designed to align with the air flow direction at different locations, creating a dynamic adaptation to the flow field that reduces resistance and maintains higher air speeds.
2Area of stationary object
If fins are alternately disposed on the end bracket and housing to be connected, then the cooling surface area is increased, but turbulent flow is generated and cooling air interference occurs
Solution Approach 1:
The patent applies local quality by having fins on the end bracket and housing with different characteristics. The end bracket fins are disposed at specific angles along the air flow direction, while the housing fins are arranged to receive the air flow from the end bracket. This local differentiation optimizes each fin group's function and prevents turbulent interference.
Solution Approach 2:
The patent introduces the end bracket as an intermediary component between the fan and the housing. The end bracket fins act as a mediator that guides and conditions the cooling air flow before it reaches the housing fins, preventing direct interference and turbulence between the two fin systems.
3Volume of moving object
If the cooling air is discharged as a turning flow from the fan, then the fan can be compact, but the cooling air collides with radially extending fins while keeping the same center, creating ventilation resistance
Solution Approach 1:
The patent addresses the turning flow issue by changing the spatial arrangement of fins from a single-plane radial configuration to a multi-dimensional arrangement. Fins are disposed at different angles and positions that accommodate the three-dimensional turning flow pattern from the compact fan, converting the flow direction change from a harmful collision into an efficient flow 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 design enhances cooling efficiency by maintaining air pressure and volume, reducing the size and cost of the fan, and preventing turbulent flow, thereby improving heat dissipation and overall performance.
Implementation Method 1
a cooling fan disposed at a central position of the anti-output shaft side
Implementation Method 2
heat is generated inside the rotating electric machine and is dissipated from a housing surface by heat conduction
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
The purpose of the present invention is to efficiently guide a cool wind from a cooling fan to the surface of a rotating electric machine. A rotating electric machine has: a housing equipped with a plurality of cooling fins extending toward an output shaft side from an anti-output shaft side end on an outer circumferential surface; an end bracket equipped with a plurality of cooling fins provided on the anti-output shaft side of the housing on an outer surface; a cooling fan disposed at a central position of the anti-output shaft side; and a fan cover that is inclined so that cooling air from the fan is directed to the housing side. In the rotating electric machine, the number of fins of the housing outer circumferential surface is equal to the number of fins of the end bracket outer surface. On the inner circumferential side, the plurality of fins on the outer surface of the end bracket is disposed at an angle along an air direction of the cooling air from the fan that is a turning flow, and on the outer circumferential side, end cross sections of the plurality of fins face anti-output shaft side end cross sections of the fins of the housing outer circumferential surface without a gap or with a small gap.