Sectorized Aeronautical Turbogenerator for Direct Multi-Voltage Output
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Solution Overview
Problem
Conventional turbogenerators face inefficiencies due to high mass, multiple conversion stages, and reliability issues when converting power to various voltage levels, and conventional electric starters have low efficiency and high mass, which are not suitable for modern hybrid electric propulsion architectures.
Innovation Solution
An aeronautical turbogenerator with a sectorized rotor and stator design, featuring axially or circumferentially distributed permanent magnets and windings, allowing direct generation of multiple independent voltage levels, reducing bulk and improving efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power electronics are used to convert power to various voltage levels, then voltage conversion is achieved, but mass increases and efficiency decreases
Solution Approach 1:
The stator is divided into multiple independent stator windings (first stator winding, second stator winding, third stator winding) that can operate independently to generate different voltage levels. This segmentation allows the generator to provide multiple voltage outputs without requiring external power electronics for conversion.
Solution Approach 2:
The single electric generator is designed to perform multiple functions by generating different voltage levels simultaneously through its multi-winding stator structure. The generator serves as both a power source and a voltage conversion device, eliminating the need for separate power electronics.
2Adaptability or versatility
If power electronics are used for voltage conversion, then voltage levels are adjusted, but reliability decreases due to additional failure points
Solution Approach 1:
The power electronics conversion stage is extracted and eliminated from the system. Instead of generating a single voltage and converting it, the generator directly produces multiple voltage levels through its multi-winding stator, removing the unreliable conversion link from the powertrain.
3Ease of operation
If conventional electric starters are used, then starting function is provided, but mass is high and efficiency is low
Solution Approach 1:
The electric generator is designed to perform dual functions: it generates electrical power during operation and also serves as the starter motor for engine starting. This eliminates the need for a separate starter device, reducing mass while maintaining starting capability.
Solution Approach 2:
The starter function is merged with the generator function. The same electric machine that generates power during operation is used to start the engine, combining two previously separate functions into a single integrated 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
Enables direct generation of polyphase alternating electrical networks with increased reliability and reduced mass, while eliminating the need for additional power electronics and starters.
Implementation Method 1
an electric generator, mechanically coupled to the heat engine and comprising a rotor and a stator, the rotor extending along an axial direction and comprising a common rotor magnetized yoke comprising a plurality of permanent magnets
Data Source
Figure 1~2
Figure 3~4B
Figure 5A~6
AI summary
The invention relates to an aeronautical turbogenerator for hybrid electric propulsion comprising a heat engine and an electric generator (10) mechanically coupled to the heat engine and comprising a rotor and a stator, the rotor extending in an axial direction and comprising a common magnetised rotor yoke (100) comprising a plurality of permanent magnets (102) defining at least three axially distributed mobile annular rings (102A, 102B, 102C), the stator comprising a magnetic stator yoke (200) comprising a plurality of electrical windings (202) defining stationary sectors (202A, 202B, 202C) distributed axially and/or circumferentially, at least two stationary sectors, one of which axially covers at least two mobile annular rings, being arranged angularly so as not to coincide with one another and thus to output at least two separate, independent voltage levels.