Winding Braid Cooling Device with Guide Wall Channel
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Solution Overview
Problem
Conventional cooling devices for air-permeable braided windings in electrical machines, such as generators, face challenges in effectively dissipating heat at the end-to-end connection area, leading to potential overheating due to hot spots and thermally overloaded braided windings.
Innovation Solution
A cooling device with a baffle and fan arrangement that directs cooling air perpendicularly onto one surface section of the braided winding, creating a channel with a minimum cross-section at the end-apex connection to enhance airflow speed and prevent backflow, ensuring effective cooling by maintaining high kinetic energy and uniform heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling air is conveyed axially into the housing to cool the stator winding, then heat dissipation from the braided winding is achieved, but hot spots occur in the end-apex connection area leading to thermal overload
Solution Approach 1:
The guide wall creates a localized channel structure with minimum cross-section specifically at the end-apex connection area, concentrating cooling airflow where thermal load is highest. This local modification of flow characteristics addresses the specific hot spot problem without changing the overall cooling system design.
Solution Approach 2:
The channel cross-section is designed with a minimum area at the end-apex connection region, which increases airflow velocity locally. This parameter change in geometry transforms the cooling effectiveness precisely where needed, converting standard cooling into enhanced cooling at the critical location.
2Temperature
If the channel cross-section is reduced to increase cooling effectiveness, then heat dissipation improves, but airflow resistance increases
Solution Approach 1:
The minimum cross-section is localized only at the end-apex connection area rather than along the entire channel length. This allows high velocity cooling where needed while maintaining larger cross-section elsewhere to minimize overall pressure drop and airflow resistance.
Solution Approach 2:
The channel provides enhanced cooling (excessive action) specifically at the end-apex connection where thermal load is highest, rather than uniformly throughout. This partial application of high-velocity cooling optimizes the balance between cooling effectiveness and airflow resistance.
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
The solution effectively prevents the formation of dead water areas, ensuring uniform cooling and high-speed airflow through the braided winding, thereby effectively cooling the end-apex connection and preventing overheating.
Implementation Method 1
a fan (9) which is arranged to blow a flow of cooling air essentially perpendicularly onto a first surface section (36) of one side (35) of the braided winding (3)
Implementation Method 2
the guide wall (21) is arranged essentially parallel and at such a distance from the surface of the second surface section (37) that a partial flow of the cooling air flow is formed in the channel formed by the guide wall (21) and the second surface section (37)
Implementation Method 3
The cooling air flows through the braided winding, as a result of which heat is dissipated from the braided winding due to convection effects
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
A cooling device for cooling an air-permeable winding braid (3) of an electrical machine (1) has a baffle (20, 21) and a fan (9), which is arranged for blowing a stream of cooling air (32) substantially perpendicularly onto a first surface portion of one side of the winding braid (3), wherein, in the region of a second surface portion (6) of the side of the winding braid, arranged alongside the first surface portion, the baffle (20, 21) is arranged substantially parallel to and at a distance (27, 28) from the surface of the second surface portion (6) such that a partial stream (34) of the stream of cooling air (32) is formed in the channel (22) that is formed by the baffle (20, 21) and the second surface portion (6), and so, on the side of the winding braid (3) that is opposite from the first-mentioned side, the other partial stream (33) of the stream of cooling air (32), penetrating the winding braid (3), flows away from the winding braid (3) without any return flow.