Rotor Shaft Refrigerant Spray Structure for Coil-End Cooling
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Solution Overview
Problem
The existing rotating electric machines cool the coil ends inefficiently due to a narrow refrigerant spray range, limiting the cooling effect.
Innovation Solution
A rotating electric machine design featuring a shaft with an inner flow path and communication holes, coupled with a facing member having inclined blade portions that spray refrigerant over a wide range to the coil ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a refrigerant is sprayed to the coil end using only centrifugal force from rotor rotation, then the structure is simple, but the spraying range is narrow and cooling effect is insufficient
Solution Approach 1:
The cooling system is segmented into multiple functional components: the shaft with communication holes provides refrigerant supply, while the facing member with inclined blade portions provides spray direction control. This segmentation allows each component to perform a specific function, achieving wide spray coverage without requiring a completely redesigned complex system.
Solution Approach 2:
The inclined blade portions on the facing member act as intermediaries between the refrigerant flow and the coil end. The blades redirect the refrigerant flow at specific angles, enabling the refrigerant to reach a wider area of the coil end that would not be accessible through direct centrifugal spraying alone.
2Temperature
If the refrigerant spray range is expanded to cool the coil end more effectively, then the cooling effect is improved, but the device complexity increases
Solution Approach 1:
The facing member serves multiple functions: it structures the refrigerant flow, directs the spray through inclined blades, and expands the cooling coverage area. By making this single component multi-functional, the system achieves improved cooling effect without adding multiple separate devices, thus avoiding excessive complexity.
Solution Approach 2:
The inclined angle of the blade portions is optimized to change the flow direction parameter of the refrigerant. By carefully selecting the inclination angle, the system maximizes the spray range and cooling effect while maintaining a simple structural configuration.
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 design effectively cools the coil ends by spraying refrigerant over a wide area, enhancing cooling efficiency.
Implementation Method 1
sprays the refrigerant in the flow path, and a guide portion that guides a refrigerant blown from the spray nozzle by centrifugal force
Implementation Method 2
cool the coil by spraying a refrigerant to a coil end
Data Source
AI summary
A rotating electric machine includes a shaft connected to a rotor, and a facing member fixed to the shaft and facing an end surface of the rotor via a space. The shaft includes an inner flow path through which a refrigerant flows, and a communication hole that allows the inner flow path to communicate with the space. The facing member includes first blade portions arranged along a circumferential direction. The first blade portion has a first inclined surface inclined with respect to a radial direction such that a distance to the end surface becomes shorter from the inner side in the radial direction toward the outer side in the radial direction. The first inclined surface comes into contact with a refrigerant sprayed from the inner flow path through the communication hole by rotation of the shaft, and sprays the refrigerant toward a coil end.