Retractable Contact Assembly for Slip Ring Wear Reduction
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Solution Overview
Problem
Conventional brush and slip ring assemblies suffer from rapid wear, require frequent replacement, and generate debris due to constant contact, even when power is not needed, leading to unnecessary wear and inefficiency.
Innovation Solution
A retractable contact assembly with a piston and elastic-force biasing device that moves between extended and retracted positions, controlled by an inelastic-force generating device, allowing the contact to be engaged or disengaged as needed, using fluid pressure and springs to maintain contact with a slip ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brush is in constant contact with the slip ring, then electrical power can be continuously supplied, but the brush and slip ring wear rapidly and generate debris
Solution Approach 1:
The contact assembly transitions from a static constant-contact state to a dynamic retractable state. The brush is mounted on a piston that can move axially between extended and retracted positions, allowing the system to adapt its contact state based on operational requirements. This dynamic configuration enables the brush to engage with the slip ring only when power transfer is needed, reducing wear during non-operational periods.
Solution Approach 2:
The system changes the contact parameter from constant contact to variable contact. By controlling the axial position of the piston through fluid pressure or spring force, the contact between brush and slip ring can be extended or retracted. This parameter change allows the system to optimize between continuous power supply capability and component wear reduction based on operational demands.
2Reliability
If the brush remains in constant contact with the slip ring, then electrical connection is maintained, but unnecessary wear occurs when power is not required
Solution Approach 1:
Instead of continuous contact, the system implements periodic or on-demand contact through the retractable mechanism. The brush can be retracted during periods when power is not required and extended when power transfer is needed. This periodic action pattern reduces cumulative wear while maintaining the capability for reliable electrical connection when required.
Solution Approach 2:
The elastic-force biasing device provides automatic engagement force, allowing the brush to self-adjust its contact pressure with the slip ring. The spring or elastic element continuously applies force to maintain contact when extended, eliminating the need for additional actuation mechanisms during normal operation while enabling retraction when needed.
3Power
If the brush is constantly engaged with the slip ring, then power transfer capability is always available, but considerable debris is generated
Solution Approach 1:
The harmful wear and debris generation are extracted from the system by removing the brush from contact with the slip ring when not needed. The retractable mechanism allows the brush to be physically separated from the slip ring surface, eliminating the source of debris generation during non-operational periods while preserving the power transfer capability when the brush is extended.
4Duration of action of stationary object
If a retractable mechanism is added to control contact position, then wear and debris are reduced, but device complexity increases
Solution Approach 1:
A piston serves as an intermediary element between the brush and the actuation force. The piston translates fluid pressure or spring force into axial movement of the brush, providing a simple mechanical interface that reduces complexity compared to direct actuation mechanisms. This intermediary approach enables retractable functionality using basic hydraulic or elastic principles.
Solution Approach 2:
The system uses fluid pressure (pneumatic or hydraulic) as a simple and effective means to control the piston position. By introducing pressurized fluid into a chamber behind the piston, the brush can be extended or retracted without complex mechanical linkages. This approach leverages readily available fluid power technology to achieve retractable contact with minimal added complexity.
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
Reduces wear and debris by allowing the contact to retract when not in use, extending only when necessary, thus prolonging component life and minimizing unnecessary wear.
Implementation Method 1
an elastic-force biasing device configured to provide an elastic force to the contact in an axial direction outward from the second opening
Implementation Method 2
an inelastic-force generating device configured to provide an inelastic force to the piston to control an axial position of the piston with respect to the outer casing between an extended axial position and a retracted axial position
Data Source
AI summary
A retractable contact assembly includes an outer casing having a first opening and a piston located in the first opening of the outer casing and moveable axially within the opening. The piston has a second opening. The assembly further includes an inelastic force generating device configured to control an axial movement of the piston and a contact located in the second opening of the piston and movable axially in the second opening of the piston. The assembly further includes an elastic force biasing device configured to provide an elastic force to the contact in an axial direction outward from the second opening.