Aircraft Propulsion Channel for Independent Propeller Speed Control
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Solution Overview
Problem
Existing aircraft propulsion systems face challenges in reducing noise and pollutant emissions, as they rely on turbomachines that require complex control systems and result in inefficient energy use.
Innovation Solution
A hybrid propulsion channel is introduced, featuring a doubly-fed polyphase asynchronous rotating electric machine mechanically coupled to a turbomachine, and a permanent magnet polyphase synchronous rotating electric machine electrically coupled to the asynchronous machine. This configuration allows for independent control of propeller speed and eliminates the need for power control circuits dedicated to synchronous machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a synchronous propulsion channel with direct connection between generator and gas turbine is used, then the structure is simplified, but the speed variation of the electric propulsion motor is dictated by the gas turbine rate and complex synchronization control is required
Solution Approach 1:
The patent introduces a Doubly-Fed Induction Generator (DFIG) as an intermediary between the gas turbine and the propeller. The DFIG includes a stator connected to the gas turbine and a rotor connected to the propeller, with independent power control circuits for each. This intermediary structure allows the propeller speed to be controlled independently of the gas turbine rate while maintaining a relatively simple overall structure.
2Adaptability or versatility
If an asynchronous propulsion channel with DFIG and DFIM is used, then propeller speed can be varied independently of turbomachine rate, but several power control circuits are required increasing mass and energy efficiency degrades
Solution Approach 1:
The patent changes the type of electric machines used in the propulsion channel. Instead of using induction machines (DFIG and DFIM) that require complex power control circuits, the patent employs synchronous machines with permanent magnets. This parameter change eliminates the need for rotor power control circuits while maintaining independent propeller speed control, thereby improving energy efficiency and reducing mass.
3Ease of operation
If synchronous generator is driven without control circuit magnetization, then it produces electric power even in fault conditions, but this can deteriorate or destroy the aircraft
Solution Approach 1:
The patent implements a control circuit that continuously monitors the operational status of the propulsion system. When a fault condition is detected, the control circuit automatically de-magnetizes the synchronous generator by controlling the field current, preventing the generation of electric power that could damage the aircraft. This feedback mechanism ensures safe operation while maintaining automatic power generation during normal conditions.
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 minimizes on-board mass, increases energy efficiency, and allows for independent control of propeller speed, reducing noise and pollutant emissions while improving turbomachine efficiency.
Implementation Method 1
at least a second polyphase rotating electric machine electrically coupled to the first asynchronous rotating electric machine
Implementation Method 2
at least a first doubly-fed polyphase asynchronous rotating electric machine to be mechanically coupled to a turbomachine
Data Source
AI summary
A propulsion channel for aircraft at least one first dual-fed polyphase asynchronous rotating electric machine configured to be mechanically coupled to a turbine engine. The propulsion channel further includes at least one second polyphase rotating electric machine electrically coupled to the first asynchronous rotating electric machine, and a control and storage module configured to control the first polyphase asynchronous rotating electric machine. The module is connected to the first dual-feed polyphase asynchronous rotating electric machine as well as to the at least second polyphase rotating electric machine. The at least second polyphase rotating electric machine includes a polyphase synchronous rotating electric machine with permanent magnet.