Grounding Brush Assembly With Rounded Flanks to Prevent Fiber Cutting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional grounding brush assemblies for electric motors or machines can damage conductive fibers due to sharp edges from the support, leading to contamination and electrical discharges through rolling bearings.
Innovation Solution
A grounding brush design featuring a support with lateral flanks having convex or frustoconical chamfered connecting surfaces to reduce the risk of fiber cutting, along with a mounting plate for axial and radial retention, made from conductive materials like aluminum or stainless steel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional support structure with sharp edges is used, then the support can effectively retain the conductive fibers, but the sharp edges cut the conductive fibers causing contamination and electrical discharges
Solution Approach 1:
The patent applies curvature by replacing sharp edges with rounded edges on the support structure. Specifically, the support features rounded edges at the corners and along the retention surfaces, which eliminates the cutting action on conductive fibers while maintaining the structural integrity and grounding function. This curvature modification directly addresses the fiber cutting problem without compromising the support's ability to retain fibers effectively.
2Object-affected harmful factors
If the support structure is modified to eliminate sharp edges, then fiber cutting is reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent modifies geometric parameters of the support structure by specifying rounded edge radii (e.g., R1, R2, R3 with specific dimensional ranges). These parameter changes transform the sharp-edged geometry into rounded-edged geometry, reducing fiber cutting while maintaining manufacturability through defined dimensional specifications that can be incorporated into standard manufacturing processes.
3Device complexity
If conventional grounding brush design is used, then the structure is simple, but conducting fibers get cut by the support causing contamination inside the motor
Solution Approach 1:
The support structure incorporates rounded edges with specified radii (R1, R2, R3) throughout its geometry, transforming sharp cutting edges into smooth curved surfaces. This curvature modification prevents fiber cutting and contamination while maintaining overall structural simplicity, as the rounding can be integrated into existing support designs without adding complex additional components.
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 minimizes fiber cutting and maintains electrical potential balance, reducing electrical discharges and contamination within the motor, thereby protecting components and ensuring effective grounding.
Implementation Method 1
By virtue of the conductivity of the fibers, the brush is kept at the same electrical potential as the housing of the electric motor
Implementation Method 2
the risk of the support (e.g., a sharp edge of the support) cutting the conductive fibers is reduced because of the connecting surface that extends between the internal frontal face and the bore
Data Source
AI summary
A grounding brush includes a plurality of conductive fibers and a support inside which the conductive fibers are mounted. The support includes a mounting portion and two lateral flanks extending from the mounting portion and axially gripping the conductive fibers. Each lateral flank of the support has an internal frontal face and an external frontal face, the two faces delimiting the axial thickness of each lateral flank, and a bore. Each lateral flank of the support is further provided with a connecting surface extending between the internal frontal face and the bore.