Winding Head Cooling Guide to Block Air Gap Fluid Penetration
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Solution Overview
Problem
Existing cooling fluid distribution in electrical machines leads to undesirable drag torques due to fluid penetration into the air gap between the rotor and stator, causing inefficiencies.
Innovation Solution
A guide device is used to circumferentially guide the cooling fluid around the shaft and air gap, utilizing guide elements with specific orientations and elevations to prevent fluid penetration into the air gap, ensuring effective distribution and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling fluid is sprayed onto winding heads, then cooling effectiveness is improved, but cooling fluid penetrates into the air gap causing drag torques
Solution Approach 1:
A guide element is introduced as an intermediary component between the cooling fluid spray and the air gap. The guide element captures the cooling fluid that flows down from the winding heads and redirects it away from the air gap, preventing penetration while maintaining cooling effectiveness. The guide element acts as a mediator that separates the beneficial cooling function from the harmful fluid penetration.
Solution Approach 2:
The harmful aspect (cooling fluid penetration into the air gap) is extracted and separated from the beneficial aspect (cooling of winding heads). The guide element extracts the cooling fluid from its harmful path and redirects it through a designated channel away from the air gap, allowing the cooling function to be maintained while eliminating the drag torque problem.
2Temperature
If cooling fluid is distributed within the electrical machine, then cooling coverage is improved, but operational efficiency decreases due to drag losses
Solution Approach 1:
The guide element serves as an intermediary structure that intercepts cooling fluid before it can enter the air gap and be distributed within the electrical machine. By capturing and redirecting the fluid through a controlled path, the guide element prevents the fluid from causing drag losses while still allowing it to perform its cooling function on the winding heads.
Solution Approach 2:
The guide element converts the potentially harmful effect of cooling fluid penetration into a beneficial outcome. By capturing the fluid that would otherwise cause drag losses and redirecting it through a designated channel, the system transforms what was a harmful distribution pattern into a controlled, beneficial cooling pathway that eliminates energy losses.
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 solution reduces or eliminates undesired drag losses by improving cooling fluid distribution, enhancing the operational efficiency of electrical machines.
Implementation Method 1
a cooling fluid flowing around the winding heads
Implementation Method 2
stator windings heat up due to their ohmic resistance... cooling fluid... for heat dissipation
Implementation Method 3
The second guide element serves to collect the cooling fluid flowing towards a machine base by gravity after flowing down from the first guide element
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Guide device (1) for a cooling fluid flowing around a winding head (28) of an electrical machine (21), comprising a body (2) with a recess (4) bounded by an inner edge (3) for passing a shaft of the electrical machine (21) and a guide element (5) which projects axially from the body (2) and extends circumferentially at a radial position located between the inner edge (3) and an outer edge (6) of the body (2).