Self-Excited Asynchronous Generator for Rotary Power Supply
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Solution Overview
Problem
Existing methods for supplying electrical energy to rotary supports, such as aircraft engine rotors, are unreliable, cumbersome, and require heavy equipment like brush devices or rotating transformers, especially when high power is needed.
Innovation Solution
An asynchronous machine configured as a self-excited asynchronous generator, with a stator fixed to a stationary part and a rotor on the rotary support, utilizing a switch and excitation device to generate power without the need for brush devices or rotating transformers, allowing the rotary support to function as a power source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brush device is used to supply electrical energy to the rotor, then electrical power can be transmitted, but the device becomes unreliable and requires frequent maintenance
Solution Approach 1:
The invention extracts and eliminates the brush device from the electrical power transmission system. Instead of using brushes to transmit power to the rotor, the system uses the rotor itself as a generator to produce the required electrical power, completely removing the problematic brush component that caused reliability issues and maintenance requirements.
Solution Approach 2:
The rotor serves itself by functioning as a self-excited asynchronous generator. The rotor generates its own electrical power through electromagnetic induction when rotated by the engine, eliminating the need for external power transmission mechanisms like brushes. The system becomes self-sufficient, generating the power it needs internally.
2Power
If a rotating transformer is used to transmit electrical energy to the rotor, then power transmission is achieved, but the device becomes heavy and cumbersome
Solution Approach 1:
The invention extracts and eliminates the rotating transformer from the system. By making the rotor itself the power source through electromagnetic generation, the heavy transforming equipment is removed entirely, achieving power transmission without the weight penalty of rotating transformers.
Solution Approach 2:
The invention replaces the mechanical electromagnetic transformation system (rotating transformer) with a direct electromagnetic generation system. The rotor functions as an asynchronous generator using electromagnetic induction, substituting the complex mechanical transformation apparatus with a more efficient electromagnetic energy conversion process.
3Power
If a self-excited asynchronous generator is configured with the capacitor bank on the rotor, then the rotor can generate power, but the stator requires external power supply which defeats the purpose
Solution Approach 1:
The invention inverts the traditional self-excited asynchronous generator configuration. Instead of placing the capacitor bank on the stator and requiring external power supply to the stator windings, the capacitor bank is placed on the rotor and the rotor windings are connected to the external load. This inversion allows the rotor to generate power directly for external use without consuming power at the stator.
Solution Approach 2:
The rotor becomes self-sufficient by carrying its own capacitor bank and generating electrical power through electromagnetic induction. The rotor produces the reactive power it needs internally through the capacitor bank, eliminating the need for external power supply to the stator. The system generates its own required power independently.
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
This solution provides reliable and efficient power transmission to electrical equipment on rotary supports without the need for heavy or cumbersome devices, using the rotary support to generate power and eliminating the requirement for external power supply to the stator.
Implementation Method 1
When the rotary support, and hence the rotor of the asynchronous machine, are driven in rotation, the asynchronous machine is then able to function as a self-excited asynchronous generator and to generate electrical energy in the winding of the rotor
Implementation Method 2
said excitation device being able to supply a reactive current to said electrical circuit of the stator or to said winding of the rotor
Data Source
AI summary
An apparatus including a fixed part, a rotary support configured to be driven in rotation relative to the fixed part, at least one item of electrical equipment carried by the rotary support, and a power supply device configured to supply electrical energy to the electrical equipment. The power supply device includes an asynchronous machine including a stator fixed to the fixed part and a rotor carried by the rotary support, and an excitation device. The stator includes an electrical circuit including at least one switch configured to switch between an open state in which the electrical circuit is open and a closed state in which the electrical circuit is closed. The rotor includes at least one winding connected to the electrical equipment. The excitation device is configured to provide a reactive current to the electrical circuit of the stator or to the winding of the rotor.