Fiber Grounding Brush Assembly with Adjustable U-Shaped Brackets
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Solution Overview
Problem
Conventional grounding brush assemblies are specific to the size and shape of motor shafts and housings, requiring separate designs for each motor or machine, which limits their adaptability to different shaft diameters and increases the risk of electrical discharges, bearing damage, and electromagnetic noise.
Innovation Solution
A fiber grounding brush assembly with U-shaped conductive fibers and a mounting plate with adjustable U-shaped brackets, allowing the brush to be securely attached to various motor shaft diameters, ensuring consistent electrical grounding and reducing the need for multiple designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional grounding brush assemblies are designed specifically for each motor shaft size and shape, then the grounding effectiveness is ensured, but the device complexity increases and adaptability decreases
Solution Approach 1:
The grounding brush assembly is designed with a universal mounting plate and adjustable U-shaped brackets that can accommodate multiple shaft diameters and shapes. The mounting plate includes multiple tab configurations that can be adjusted to fit different shaft sizes, allowing a single grounding brush design to serve multiple motor types and shaft configurations, thereby improving adaptability while maintaining grounding effectiveness
Solution Approach 2:
The U-shaped brackets are designed to be adjustable and reconfigurable rather than fixed. The tabs can be positioned at different locations and orientations to adapt to various shaft diameters and shapes. This dynamic adjustability allows the same grounding brush assembly to be universally applied to different motor shafts without requiring multiple specialized designs
2Reliability
If multiple specialized grounding brush designs are created for different motor shafts, then the grounding reliability is maintained, but the manufacturing cost and device complexity increase
Solution Approach 1:
Instead of creating multiple specialized grounding brush designs for different motor shafts, the invention employs a single universal grounding brush assembly with an adjustable mounting plate. The mounting plate features multiple tab configurations and U-shaped brackets that can be adjusted to accommodate various shaft diameters and shapes, thereby reducing device complexity and the number of different brush designs needed while maintaining grounding reliability across different applications
Solution Approach 2:
The mounting plate is segmented into multiple adjustable tabs and U-shaped brackets that can be independently positioned and configured. This segmentation allows each component to be adjusted to fit specific shaft dimensions, enabling a single standardized grounding brush design to adapt to multiple shaft types without requiring multiple complete brush designs, thus reducing overall device complexity
3Reliability
If the grounding brush fibers are made long to maintain contact with the shaft, then the grounding effectiveness improves, but the fibers wear out faster and the brush lifespan decreases
Solution Approach 1:
The U-shaped brackets are designed to be adjustable in position, allowing the grounding brush fibers to be repositioned along the shaft as they wear down. This dynamic adjustment capability enables the grounding brush to maintain effective contact with the shaft throughout the fibers' service life, extending the operational duration without sacrificing grounding effectiveness. The adjustable mounting system allows for compensation of fiber wear by repositioning the brush elements
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 adaptable grounding brush assembly effectively eliminates electrical discharges and noise, protects bearings, and extends the lifespan of the grounding brush by allowing adjustment to fit different shaft diameters and maintaining contact with the shaft despite wear.
Implementation Method 1
the first and second side walls being crimped toward each other with sufficient force to secure the fibers and the at least one wire in the at least one channel
Implementation Method 2
Because the fibers are conductive, the shaft is maintained at the same electrical potential as the housing. This maintains the inner and outer rings of the bearing supporting the shaft at the same electrical potential and eliminates or substantially eliminates problematic electrical discharges through the bearings
Data Source
AI summary
A grounding brush assembly includes a plurality of conductive fibers extending from at least one support, a mounting plate having a first side and a second side and an opening configured to surround a rotatable motor shaft having an axis of rotation, and a plurality of tabs disposed in a circle around the periphery. Each of the tabs extends axially from the first side of the mounting plate and radially toward or away from the axis of rotation to define with an adjacent portion of the first side of the mounting plate a U-shaped bracket. The at least one support is secured against the first side of the mounting plate by the plurality of tabs.