Asynchronous Machine Power Transfer for Rotating Engines
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Solution Overview
Problem
Existing electrical power supply systems for rotating equipment, such as airplane engine blades, are heavy, unreliable, require frequent maintenance, and face compatibility issues with oily environments, while rotary transformers at high frequencies suffer from material degradation and vibration sensitivity.
Innovation Solution
An asynchronous machine with a progressive wave winding and a single conductor bar per slot is used to efficiently transfer AC power from a stator to a rotor, reducing weight, size, and maintenance needs, and maintaining efficiency across a range of drive speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brush devices are used to transmit electricity from stationary portions, then electrical power can be supplied to rotating equipment, but the system becomes heavy, unreliable, and requires regular maintenance
Solution Approach 1:
The patent replaces the mechanical brush contact system with an electromagnetic induction system using an asynchronous machine. The stator windings generate a rotating magnetic field that induces current in the rotor windings, eliminating the need for physical brush contacts and achieving contactless power transmission to rotating equipment.
Solution Approach 2:
The asynchronous machine acts as an intermediary device between the stationary power source and the rotating load. It receives AC power from the stationary stator and transfers it to the rotating rotor through electromagnetic induction, serving as a mediator that eliminates direct mechanical contact while enabling power transmission.
2Power
If rotary transformers operate at high frequency and high power, then power transmission capability is improved, but laminated materials lose their properties when temperature rises above 200°C, causing high losses and sensitivity to vibration and impacts
Solution Approach 1:
The patent changes the operating parameters of the transformer by using an asynchronous machine design that operates at optimized frequencies and temperatures. The electromagnetic induction mechanism allows flexible parameter adjustment, enabling the system to operate at high power while maintaining component temperatures below the 200°C threshold where laminated materials degrade.
3Reliability
If asynchronous machine is designed with conventional windings, then manufacturing is simplified, but reliability and efficiency are reduced
Solution Approach 1:
The patent applies progressive wave windings specifically in the rotor or stator of the asynchronous machine. This localized application of a specialized winding configuration improves the reliability and efficiency of the power transmission while maintaining conventional manufacturing methods for the overall machine structure.
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 provides a lightweight, reliable, and low-maintenance power supply system with reduced losses and improved performance for powering equipment on rotating engines, specifically addressing the inefficiencies and reliability issues of prior systems.
Implementation Method 1
the asynchronous machine is also arranged to receive alternating current (AC) electrical power via a stator of said asynchronous machine, and it presents, over a predetermined range of drive speeds of the rotor of the asynchronous machine under drive by said rotor of the engine, efficiency in transferring electrical power from said stator to said rotor
Data Source
AI summary
An electrical power supply including an asynchronous machine, an arrangement for driving a rotor of the asynchronous machine in rotation by a rotor of an engine, and an electrical connection for powering electrical equipment by the rotor of the asynchronous machine. The asynchronous machine is configured to receive AC electrical power via a stator of the asynchronous machine, and it presents, over a predetermined range of drive speeds of the rotor of the asynchronous machine under drive by the rotor of the engine, efficiency in transferring electrical power from the stator to the rotor that is privileged relative to the efficiency with which rotary mechanical power is converted into electrical power.