Copper-Silver Alloy Sliding Contact Wire
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Solution Overview
Problem
Existing sliding contact wires made from copper-beryllium alloys have poor electrical conductivity and environmental concerns, leading to increased costs and complexity in transmitting higher currents, as they require larger diameters or more wires, which are costly and environmentally harmful.
Innovation Solution
A wire with a copper-silver alloy core and a precious metal alloy coating, which provides higher conductivity and elasticity, allowing for a smaller cross-section while reducing the need for expensive precious metals and avoiding beryllium use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If copper-beryllium alloy is used for the wire core, then elastic properties are improved, but electrical conductivity deteriorates
Solution Approach 1:
The patent employs a composite wire structure with a copper-silver alloy core and a precious metal coating layer. The copper-silver alloy core provides the necessary elastic properties for sliding contact applications, while the precious metal coating ensures high electrical conductivity and corrosion resistance. This composite structure resolves the contradiction between elastic properties and electrical conductivity by combining materials with complementary characteristics.
2Power
If wire diameter is increased to transmit higher currents, then current-carrying capacity is improved, but manufacturing cost deteriorates
Solution Approach 1:
The patent applies local quality by concentrating the precious metal material specifically in the coating layer where it is most needed for electrical contact, rather than using it throughout the entire wire cross-section. The copper-silver alloy core provides the bulk current-carrying capacity at lower cost, while the precious metal coating ensures low contact resistance at the interface. This localized application of expensive material optimizes the balance between current-carrying capacity and manufacturing cost.
3Power
If number of wires is increased to transmit higher currents, then current-carrying capacity is improved, but device complexity deteriorates
Solution Approach 1:
The patent changes the material parameters of the wire core by using copper-silver alloy with optimized silver content (5-20 wt%), which significantly improves electrical conductivity compared to copper-beryllium alloys. This parameter change allows a single wire to carry higher currents, eliminating the need for multiple parallel wires and thereby reducing system complexity while maintaining or improving current-carrying capacity.
4Strength
If copper-beryllium alloy is used, then elastic properties are improved, but environmental impact deteriorates
Solution Approach 1:
The patent extracts and eliminates beryllium from the wire core composition, replacing it with a copper-silver alloy that provides comparable or superior elastic properties without the environmental and health hazards associated with beryllium. This extraction of the harmful element resolves the contradiction between achieving necessary mechanical properties and minimizing environmental impact.
Data Source
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AI summary
The invention relates to a wire for producing a sliding contact, wherein at least an inner core of the wire comprises a copper/silver alloy. The invention also relates to a sliding contact with at least one such wire, wherein a mating contact is provided, with at least one of the wires resting on the conductive surface of said mating contact, wherein the spring force of the wire on the conductive surface of the mating contact brings about electrical contact between the wire and the mating contact, and the mating contact is moveable towards the wire, with the result that the surface of the wire slides over the mating contact during a movement of the mating contact. Finally, the invention also relates to a potentiometric sensor, a potentiometer, a sliding controller, a position sensor, a rotary switch, an electric motor, a generator, a wind turbine, a slip ring system, a servo drive or a current collector with such a sliding contact.