Propeller Hub Power Transfer With Coaxial Electrical Isolation
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Solution Overview
Problem
Existing de-icing systems for aircraft propellers, particularly for UAVs, face challenges in efficiently transmitting both electrical power for de-icing and mechanical power for propulsion while maintaining structural integrity and avoiding interference with sensors.
Innovation Solution
A power transmission system comprising a hollow inner conductive cylinder and a concentric outer insulating cylinder, with conductive elements and bores, allows for simultaneous transmission of electrical power to de-icing components and mechanical power to the propeller blades, using a rotatable shaft with co-axial shafts and insulators to maintain electrical isolation and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electrical heating elements are installed within the propeller blade for de-icing, then ice accumulation is prevented, but the complexity of the power transmission system increases
Solution Approach 1:
The patent implements a nested structure where the hollow inner conductive cylinder is positioned inside the hollow outer insulating cylinder, creating a concentric arrangement. This nesting allows electrical power transmission through the inner cylinder while the outer cylinder provides insulation and structural support, resolving the complexity issue by organizing multiple functions within a compact nested geometry.
Solution Approach 2:
The power transmission system is segmented into distinct functional components: the hollow inner conductive cylinder for electrical power transmission, the hollow outer insulating cylinder for electrical insulation and structural support, and the solid core shaft for mechanical power transmission. This segmentation allows each component to be optimized for its specific function while working together as an integrated system.
2Adaptability or versatility
If both electrical power and mechanical power are transmitted through the propeller hub, then de-icing and propulsion functions are enabled, but electrical interference may occur
Solution Approach 1:
The hollow outer insulating cylinder serves as an intermediary element between the electrical power transmission path (inner conductive cylinder) and the mechanical power transmission path (solid core shaft). This insulating intermediary prevents electrical interference while allowing both power transmission functions to coexist within the same propeller hub structure.
Solution Approach 2:
The system segments electrical and mechanical power transmission into separate concentric pathways: electrical power flows through the hollow inner conductive cylinder, while mechanical power is transmitted through the solid core shaft. This spatial segmentation eliminates electrical interference by keeping conductive and mechanical paths electrically isolated.
3Reliability
If a hollow cylinder structure is used for power transmission, then electrical isolation is achieved, but manufacturing complexity increases
Solution Approach 1:
The hollow outer insulating cylinder performs multiple functions simultaneously: it provides electrical insulation between the inner conductive cylinder and the external environment, serves as a structural support element, and acts as a mounting framework for the conductive rod. This multi-functionality reduces the need for additional separate components, thereby simplifying manufacturing despite the hollow cylinder geometry.
4Ease of operation
If conductive elements are positioned on the end surfaces of the insulating cylinder, then electrical connections are established, but the risk of short circuits increases
Solution Approach 1:
The hollow outer insulating cylinder acts as an intermediary barrier that electrically isolates the conductive elements positioned on its end surfaces from the inner conductive cylinder. This insulating mediation allows electrical connections to be easily established on the outer surface while preventing short circuits with the inner conductive components through the intervening insulating material.
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
Enables effective and reliable transmission of electrical power to de-icing elements and mechanical power to propellers, preventing ice accumulation while ensuring sensor functionality and structural integrity.
Implementation Method 1
The conductive element may be electrically insulated from the inner conductive cylinder by the outer insulating cylinder
Data Source
AI summary
A power transmission system for a propeller hub of an aircraft is described, wherein the power transmission system comprises a hollow inner conductive cylinder configured to be mounted to a rotatable shaft a hollow outer insulating cylinder concentric with the inner conductive cylinder, wherein at least a portion of the outer insulating cylinder is located radially outwardly of the inner conductive cylinder, a conductive element positioned at a first end surface of the outer insulating cylinder, wherein the outer insulating cylinder comprises a bore extending radially outwardly from an inner diameter to an outer diameter of the outer insulating cylinder to house a conductive rod for connecting the inner conductive cylinder to a first electrical terminal; wherein the conductive element is configured to be connectable to a second electrical terminal. An aircraft, such as a UAV, comprising the power transmission is also described.