Slip Ring Brush Holder Structure for Insulated Brush Guidance
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Solution Overview
Problem
Existing brush holders for slip ring assemblies suffer from non-detachable connections, inaccurate brush guidance, susceptibility to failure due to complex production and mechanical stress, and inadequate electrical insulation, which limits their ability to transmit high voltages and prevent electrical flashovers.
Innovation Solution
A brush holder design comprising a conductive contacting member and an insulating guiding member, which ensures reliable electrical insulation and secure brush guidance, allowing for higher voltage transmission while preventing flashovers, with a form-fitting connection to a substrate and easy brush replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a bent sheet metal part is used to hold the brush, then the brush holder can be manufactured simply, but the radii due to manufacturing process lead to inaccurate guidance of the brushes
Solution Approach 1:
The patent changes the geometric parameters of the brush holder by providing a linear contacting member instead of a bent sheet metal part with radii. This eliminates the manufacturing-induced radii that caused inaccurate brush guidance, while maintaining simple manufacturability through linear geometry that is easier to manufacture with precise tolerances.
2Volume of moving object
If the distance between the electrically conductive bent part and the neighboring slipways is reduced, then the structure becomes more compact, but unwanted electrical flashovers occur easily
Solution Approach 1:
The patent introduces an insulating element as an intermediary between the electrically conductive contacting member and the neighboring slipways. This insulating element acts as a mediator that allows the structure to remain compact while preventing electrical flashovers by providing the necessary electrical insulation in the limited space between conductive parts.
3Ease of manufacture
If blind rivets are used to connect the brush holder, then the connection is simple to manufacture, but the connection is non-detachable making brush replacement impossible
Solution Approach 1:
The patent segments the brush holder connection system into detachable components, allowing the brush to be separated from the holder. This enables simple manufacturing of individual components while providing ease of repair through detachable connections that allow brush replacement without replacing the entire holder assembly.
4Power
If a large number of brush wires are soldered into a sleeve, then the brush can transmit more current, but the production becomes complex and the brush is prone to failure
Solution Approach 1:
The patent extracts the brush wires from the complex soldered sleeve structure and replaces them with a solid electrically conductive contacting member. This maintains the current transmission capacity while eliminating the production complexity and failure-prone solder joints associated with multiple individual wires.
5Device complexity
If individual brush wires are soldered onto the surface of a printed circuit board, then a simple parallel connection is possible, but the solder joints are mechanically stressed and susceptible to failure
Solution Approach 1:
The patent replaces the mechanically stressed solder joint system with a press-fit or interference fit mechanical connection between the contacting member and the printed circuit board. This substitution eliminates the fragile solder joints while maintaining simple electrical parallel connection, improving reliability through a more robust mechanical connection method.
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 achieves reliable electrical insulation, reduces the risk of arc-overs, and enables easy brush replacement, while maintaining compact geometry and efficient electrical contact, suitable for transmitting high voltages and multiple signals.
Implementation Method 1
Since the guiding member 2 is made of an electrically insulating material, the insulating distance between the electrically conducting part of the brush holder and the neighboring slipways of a slipring assembly that do not belong to the brush holder is increased
Implementation Method 2
The galvanic contact between the slipway and the brush transmits electrical current
Data Source
AI summary
An apparatus according to the invention comprises a brush holder for receiving a brush for transmitting power between a rotating part and a stationary part of a slip ring having at least a first electrically conductive contacting member and a second electrically insulating guiding member.