Graphene-Coated Rotor Windings for Higher Current and Cooling
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Solution Overview
Problem
Conventional cooling arrangements for rotor windings in electric generators are inefficient, limiting the current carrying capacity and operational rating of turbo-generators, especially under overexcited conditions, due to physical constraints and material limitations of copper coils.
Innovation Solution
Applying a Graphene derivative coating on conductors and heat convection enabling components within the rotor windings to enhance heat dissipation and reduce electrical resistivity, thereby increasing current carrying capacity without compromising compactness or costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional copper coils are used for rotor windings with standard cooling arrangements, then the generator can operate with reasonable costs and commercial viability, but the current carrying capacity is limited due to insufficient heat removal from the coil surfaces
Solution Approach 1:
The patent applies Graphene derivative coating on the rotor winding conductors to fundamentally change the thermal and electrical parameters of the conductor surface. This coating reduces electrical resistivity and enhances thermal conductivity, allowing for increased current carrying capacity while maintaining effective heat removal from the coil surfaces.
Solution Approach 2:
The patent uses composite material structure by coating copper conductors with Graphene derivative layers. This composite structure combines the high electrical and thermal conductivity of copper with the superior surface properties of Graphene, creating a material that exceeds the performance of conventional copper alone in terms of current carrying capacity and heat dissipation efficiency.
2Reliability
If the cross-section of copper conductors is increased to boost current carrying capacity, then more current can be carried, but the physical dimensions of the generator must be increased which is constrained by design requirements
Solution Approach 1:
Instead of increasing the physical cross-section of the conductors, the patent changes the electrical and thermal parameters of the existing conductor material by applying Graphene derivative coating. This allows the same physical dimensions to carry higher current densities due to reduced resistivity and improved heat removal, thereby maintaining compact generator dimensions while achieving higher power ratings.
3Loss of energy
If conventional cooling gas flow is increased to improve heat removal, then cooling efficiency improves, but the complexity and constraints of the cooling arrangement increase
Solution Approach 1:
The patent changes the thermal properties of the conductor surface through Graphene derivative coating, which inherently improves heat removal efficiency without requiring increased cooling gas flow or more complex cooling arrangements. The enhanced thermal conductivity of the coating allows heat to be conducted more effectively from the conductor interior to the surface, reducing the demand on the cooling system.
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 Graphene coating reduces I2R losses and enhances heat dissipation, allowing for increased current flow and power upgrades while extending the operational life and efficiency of the generator by minimizing corrosion.
Implementation Method 1
Applying a Graphene derivative coating on conductors and heat convection enabling components within the rotor windings to enhance heat dissipation and reduce electrical resistivity
Implementation Method 2
The Graphene coating reduces I2R losses and enhances heat dissipation, allowing for increased current flow and power upgrades
Data Source
AI summary
A coated article for an electro-mechanical which includes conductors carrying current therewithin, at least one heat convection enabling component disposed in an operable connection with one or more of the conductors, and a coating applied at least partially on the conductors and/or the at least one heat convection enabling component. The coating is a Graphene coating increasing current carrying capacity of the conductors and enhancing operational efficiency of the electro-mechanical device.