Photosensor Inspection of Laminated Iron Core Cooling Flow Paths
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Solution Overview
Problem
The cooling efficiency of rotors in motors or generators is compromised due to clogged cooling flow paths in laminated iron cores, making visual inspection of the penetrating state difficult, especially when the paths are curved or not straight, leading to inadequate refrigerant supply and reduced motor performance.
Innovation Solution
A method and apparatus using a photosensor with a light projecting and receiving part to inspect the penetrating state of cooling flow paths by detecting light through openings in the laminated iron core, allowing for efficient and easy inspection even when visual confirmation is impossible, and utilizing a turntable to rotate the core for sequential inspection of multiple paths with fewer sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual inspection method is used to check cooling flow path penetration, then inspection simplicity is maintained, but inspection capability is insufficient when paths are curved or not straight
Solution Approach 1:
The patent replaces visual inspection (mechanical/optical direct observation) with a photosensor-based light detection system. Light is projected through the cooling flow path openings, and photosensors detect the transmitted light to determine penetration status, enabling automated detection of curved or non-straight paths that visual inspection cannot detect.
2Reliability
If multiple photosensors are used to inspect all cooling flow paths simultaneously, then inspection completeness is improved, but device complexity increases
Solution Approach 1:
The patent introduces rotational movement to the inspection system. The turntable rotates the laminated iron core, bringing different cooling flow path openings sequentially into position for inspection by a fixed photosensor. This dynamic approach allows one photosensor to inspect multiple paths over time, reducing sensor quantity while maintaining inspection completeness.
3Temperature
If cooling flow path is designed to extend toward longitudinal-direction central area of permanent magnet, then cooling efficiency is improved, but visual confirmation of penetrating state becomes difficult
Solution Approach 1:
The patent uses light as an intermediary substance to inspect the cooling flow path. Light is projected through the path openings, and the photosensor detects light transmission to infer penetration status. This intermediary approach allows indirect detection of paths that are difficult to observe visually, especially those extending toward the longitudinal-direction central area.
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
Enables efficient and easy inspection of cooling flow paths, ensuring adequate refrigerant supply and maintaining motor performance by detecting light transmission through the paths, thus preventing foreign matter accumulation and enhancing cooling efficiency.
Implementation Method 1
detecting light from the light projecting part by the light receiving part
Data Source
AI summary
There is provided a method for inspecting a laminated iron core structured by laminating a plurality of iron core pieces-having a predetermined shape and including therein a cooling flow path allowing refrigerant to flow therethrough, the refrigerant being supplied and discharged through openings formed at different positions. The method includes arranging a light projecting part and a light receiving part of a photosensor in the openings of the cooling flow path, respectively, and detecting light from the light projecting part by the light receiving part to thereby inspect a penetrating state of the cooling flow path.