Shaft Grounding Rope With Discrete Fixation Points
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Solution Overview
Problem
Existing grounding apparatuses for electric machines face challenges in effectively grounding rotating shafts, leading to stray voltage buildup that can shorten the lifespan of components like bearings.
Innovation Solution
A grounding rope and adjustable guide system that securely attaches to the rotating shaft, utilizing conductive and non-conductive members with discrete fixation points to maintain contact and prevent wear, while an insulated conductive member can signal when replacement is needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a grounding rope is used to ground the rotating shaft, then stray voltage buildup is prevented, but the grounding rope is subject to wear that reduces its lifespan
Solution Approach 1:
The grounding rope is divided into multiple individual conductive members (strands) that are held together by fixation points. This segmentation allows the rope to wear unevenly while maintaining grounding function through the remaining intact strands, extending the overall lifespan of the grounding apparatus.
Solution Approach 2:
Discrete fixation points are placed at specific locations along the grounding rope to secure conductive members to the shaft. This localized reinforcement prevents wear at critical attachment points while allowing other areas to wear gradually, maintaining grounding effectiveness throughout the rope's service life.
2Reliability
If the grounding rope maintains continuous contact with the rotating shaft, then effective grounding is achieved, but wear at the contact point increases
Solution Approach 1:
As the shaft rotates, different portions of the grounding rope's conductive members periodically contact the shaft surface. This distributes the wear across multiple strands and rotation cycles rather than concentrating it at a single point, extending the grounding rope's service life while maintaining continuous grounding.
Solution Approach 2:
The grounding rope utilizes multiple conductive members with varying positions and contact characteristics. As wear occurs, the electrical and mechanical parameters of the remaining strands change, but the system maintains grounding effectiveness through the collective contribution of all intact members.
3Ease of manufacture
If the grounding rope structure is simplified, then ease of manufacture improves, but the ability to signal wear and extend lifespan is reduced
Solution Approach 1:
The grounding rope consists of separate conductive members held together by discrete fixation points, which can be manufactured and assembled using simple processes. This segmented structure inherently provides wear detection capability, as missing or worn strands are easily identifiable, and allows the rope to function with partial degradation.
Solution Approach 2:
The grounding rope is designed as a replaceable component with a finite service life. The simple segmented structure allows for easy manufacturing and replacement, while the discrete fixation points and multiple strands provide built-in wear indication. When wear reaches critical levels, the entire rope can be replaced as a single unit.
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
Effectively grounds the rotating shaft, preventing current flow through bearings and extending the lifespan of the grounding rope by maintaining contact and alerting maintenance when wear reaches a critical point.
Implementation Method 1
a grounding rope configured to ground an electrically conductive surface of a rotating shaft
Data Source
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AI summary
A grounding rope assembly for electrically grounding a rotatable conductive shaft of a dynamo-electric machine. The assembly includes a grounding rope member including a plurality of conductive wires extending along the length of the grounding rope member and one or more discrete fixation points intermediate the first and second ends of the grounding rope member. Two or more of the plurality of conductive wires are affixed together at each of the discrete fixation points.