Coaxial High-Voltage Cable with Opposing Currents
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Solution Overview
Problem
High-voltage lines in motor-vehicle systems face challenges with electromagnetic interference and heat management due to strong electromagnetic fields and heat generation at high currents, which existing technologies struggle to mitigate effectively.
Innovation Solution
A high-voltage line design featuring a coaxial arrangement of conductors with opposing current flow directions, eliminating electromagnetic interference and incorporating a coolant channel for internal cooling, allowing for efficient heat dissipation without the need for shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional separate supply and return lines are used, then electromagnetic interference occurs, but using a single coaxial cable with opposing current flow eliminates electromagnetic coupling while maintaining high voltage transmission capability
Solution Approach 1:
The patent combines the supply line and return line into a single coaxial cable structure, where the inner conductor carries one current direction and the outer conductor carries the opposing current direction. This merging eliminates electromagnetic coupling between separate cables while maintaining high voltage transmission capability.
Solution Approach 2:
The patent inverts the traditional approach by having opposing currents flow through concentric conductors rather than parallel conductors. The inner and outer conductors carry currents in opposite directions, causing their electromagnetic fields to cancel each other out, thereby eliminating electromagnetic interference.
2Power
If high current is transmitted, then strong electromagnetic fields and heat generation occur, but coolant channels can be integrated into the cable structure for internal cooling
Solution Approach 1:
The patent nests coolant channels within the cavity of the coaxial cable structure. The coolant channels are positioned concentrically within the cable, allowing heat to be extracted from the interior of the cable where the conductors generate heat during high current transmission.
Solution Approach 2:
The patent introduces coolant as an intermediary substance that flows through channels within the cable structure. The coolant acts as a heat transfer medium, absorbing heat generated by the conductors during high current transmission and transporting it away from the cable interior.
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 solution effectively cancels out electromagnetic fields and enhances heat transfer, reducing power losses and cooling requirements, while simplifying connections and reducing material costs by eliminating the need for shielding.
Implementation Method 1
Due to the coaxial arrangement, the resulting electromagnetic fields have a common central point. Since with intended use of the high-voltage line, one of the conductors is used as the supply line, while the other conductor is used as return line, the current flows in both lines in opposing directions. The electromagnetic fields of the two conductors thereby essentially mutually cancel out
Implementation Method 2
A coolant channel can be formed in the interior of the cable in order to cool the supply line and the return line from the inside outward
Implementation Method 3
A coolant stream is guided from the one high-voltage interface to the other high-voltage interface through at least one coolant channel formed in the cavity of the high-voltage line
Data Source
AI summary
A high-voltage line for motor-vehicle high voltage includes an interior tube surrounding an interior cavity of the high-voltage line, an electrically conducting interior conductor surrounding the interior tube, an intermediate insulation surrounding the interior conductor, an electrically conducting outer conductor surrounding the intermediate insulation, and an outer insulation surrounding the outer conductor. The outer insulation, the outer conductor, the intermediate insulation, the interior conductor, and the interior tube are disposed coaxial to one another.