Integrated Filter Power Cable for Aircraft EMI Reduction
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Solution Overview
Problem
The existing power conversion devices in aircraft are bulky and heavy due to substantial filtering means, which increase weight and volume, and fail to effectively mitigate interference in power transmission networks.
Innovation Solution
A power cable design that integrates filtering means by using ferromagnetic inserts between internal and external conductors, modifying impedance to improve interference filtering without increasing the cable's volume or weight, with the inserts made of high permeability materials and configured to avoid saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filtering means are integrated into converters or arranged in immediate vicinity, then interference filtering is improved, but weight and volume of the system increase substantially
Solution Approach 1:
The patent combines the filtering function with the power transmission cable itself by integrating ferromagnetic inserts directly into the cable structure. This merging eliminates the need for separate filtering components while maintaining interference filtering capability, thereby reducing overall system weight.
Solution Approach 2:
The power cable is designed to perform multiple functions simultaneously: power transmission and interference filtering. The ferromagnetic inserts embedded in the cable provide filtering functionality without requiring additional dedicated filtering components, achieving multi-functionality and weight reduction.
2Object-affected harmful factors
If filtering means are integrated into converters or arranged in immediate vicinity, then interference filtering is improved, but volume occupied on board aircraft increases
Solution Approach 1:
The filtering function is merged into the cable structure through ferromagnetic inserts, eliminating the need for separate filtering components that would occupy additional volume. This integration achieves space efficiency while maintaining filtering performance.
Solution Approach 2:
The cable serves dual purposes as both power transmission medium and filtering component. The ferromagnetic inserts enable the cable to perform filtering function inherently, reducing the volume required for dedicated filtering equipment.
3Power
If substantial conductor cross sections are used to withstand current strength, then current carrying capacity is improved, but weight of the cable increases
Solution Approach 1:
The cable employs composite construction with ferromagnetic inserts embedded in the dielectric material between conductors. This composite structure enhances the cable's electromagnetic properties for better filtering while maintaining efficient current transmission, potentially allowing optimization of conductor sizes.
Solution Approach 2:
The ferromagnetic inserts modify the electromagnetic parameters of the cable, particularly the impedance characteristics. By changing the magnetic permeability in the dielectric region, the cable achieves improved filtering without requiring proportional increases in conductor cross-sections.
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 reduces the need for external filtering components, decreases weight and volume, and effectively filters interference within the power cable, enhancing power transmission efficiency while maintaining the structural integrity of the aircraft.
Implementation Method 1
at least one insert comprising a ferromagnetic material, the insert being arranged between the internal conductor and the external conductor
Implementation Method 2
The insert introducing a first impedance between the internal conductor and the external conductor with a value different from a second impedance
Data Source
AI summary
A power cable for transmitting electrical power includes at least two electrical conductors extending mainly along a power transmission axis. A first of the conductors called the external conductor surrounds a second of the conductors called the internal conductor along the axis. At least one insert is arranged between the internal conductor and the external conductor. The insert extends over only part of the cable along the axis. The insert introduces a first impedance between the internal conductor and the external conductor with a value different from a second impedance between the internal conductor and the external conductor outside of the part of the cable over which the insert extends.