Slip Ring Shaft Segmentation for Torsional Strength
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Solution Overview
Problem
Conventional slip ring devices in rotary electric machines face issues with stress concentration and weakened sections due to the integration of rotor shaft and slip ring structure, requiring labor-intensive shrink-fitting and limiting shaft diameter, which complicates strength improvement and increases the risk of failure under torsional torque.
Innovation Solution
A slip ring device with a separate slip ring shaft where the first and second slip rings are attached by shrink-fitting from both ends, featuring a larger diameter lead connecting portion and a coupling attached to the rotor shaft side, allowing for improved strength and reduced shrink-fitting time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rotor shaft and slip ring structure are integrated, then the structure is simplified, but stress concentration occurs and the shaft diameter is limited
Solution Approach 1:
The invention separates the slip ring structure from the rotor shaft by introducing a dedicated slip ring shaft. This segmentation allows the slip rings to be mounted on a separate shaft that can be optimized independently for electrical function, while the rotor shaft can be optimized for mechanical strength and torsional torque resistance. The slip ring shaft and rotor shaft are connected through a coupling mechanism, enabling independent design optimization of each component.
2Strength
If the lead connecting portion has a larger diameter to improve strength, then the shaft diameter is increased, but the shrink-fitting process becomes more complex
Solution Approach 1:
The invention applies different diameter specifications to different portions of the slip ring shaft. The lead connecting portion has a larger diameter to accommodate radial leads and provide structural strength, while the slip ring mounting portions have smaller diameters optimized for their specific functions. This local differentiation of quality allows each section to be optimized for its specific requirement without compromising the overall design.
3Manufacturing precision
If slip rings are attached by shrink-fitting from both ends, then the alignment precision is improved, but the manufacturing time is increased
Solution Approach 1:
The invention performs preliminary alignment and positioning of the slip rings before the final shrink-fitting process. By pre-positioning the slip rings on the slip ring shaft and ensuring proper alignment of the mounting holes and keys, the subsequent shrink-fitting operation can be completed more quickly and efficiently. This preliminary preparation reduces the overall manufacturing time while maintaining high alignment precision.
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 enhances the strength of the slip ring device and reduces the time required for shrink-fitting, addressing stress concentration and torsional torque issues while enabling larger shaft diameters for improved structural integrity.
Implementation Method 1
a first slip ring and a second slip ring, both of which being put from both ends of a slip ring shaft (100), respectively; the first slip ring being attached by shrink-fitting to a first slip ring attaching portion (100a) of the slip ring shaft
Data Source
AI summary
A first slip ring and a second slip ring are put from both ends of a slip ring shaft, respectively, and are attached by shrink-fitting, the slip ring shaft being provided separately from a rotor shaft; the shaft diameter of a lead connecting portion is formed larger than the shaft diameters of respective slip ring attaching portions; and a coupling, which is attached by shrink-fitting to a shaft end portion on the rotor shaft side of the slip ring shaft after the first slip ring is attached by shrink-fitting, is provided.