Brushless Starter-Generator Single Housing Drop-In Replacement
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Solution Overview
Problem
Brushed starter-generator systems in aircraft require extensive maintenance, are inefficient, unreliable, and costly due to carbon brush wear, sparking, and the need for complex replacements that involve multiple components and lengthy downtime.
Innovation Solution
A brushless starter-generator system integrated within a single housing, featuring a brushless rotating machine and a power control unit, designed to be a direct replacement for brushed systems, with identical mechanical and electrical interfaces, utilizing a synchronous, permanent magnet, or induction machine, and a simplified, miniaturized power control unit to withstand harsh environments and provide efficient engine starting and power generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If carbon brushes are used in the starter-generator system, then electrical coupling and decoupling is achieved, but brush wear and carbon particles create maintenance needs and environmental hazards
Solution Approach 1:
The patent removes the carbon brush component entirely from the starter-generator system, replacing it with a brushless design that uses a permanent magnet rotor and stator windings to achieve electrical coupling and decoupling without physical contact, thereby eliminating brush wear and carbon particle contamination
Solution Approach 2:
The patent replaces the mechanical brush-and-commutator contact system with an electromagnetic field-based system using permanent magnets and windings, substituting mechanical wear-prone components with a reliable brushless electromagnetic coupling mechanism
2Ease of repair
If the starter-generator system is integrated within a single housing, then replacement is simplified, but access requirements remain complex
Solution Approach 1:
The patent combines the motor and generator components into a single integrated housing with unified mechanical and electrical interfaces, allowing the entire assembly to be replaced as one unit rather than requiring separate access to multiple components distributed across the engine nacelle and fuselage
3Reliability
If the starter-generator is designed for extended life operation, then reliability improves, but the system must withstand harsh environmental conditions
Solution Approach 1:
The patent designs the starter-generator with inherent robustness to withstand harsh environmental conditions including high temperatures, vibrations, and contamination from the outset, using protective housings, sealed bearings, and ruggedized components that preemptively resist environmental degradation rather than relying on maintenance interventions
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 brushless system offers extended life, improved reliability, reduced maintenance, and efficient operation in extreme conditions, with the ability to start engines from low battery voltage and generate high torque, while minimizing downtime and environmental hazards.
Implementation Method 1
The starter-generator system functions as an electric motor rotating the shaft to start the engine... Once the engine reaches idle speed, the starter-generator system functions as a generator that converts mechanical power from the moving engine, in the form of shaft rotation, to usable electrical power
Implementation Method 2
The apparatus includes a main generator, an exciter generator, and a permanent magnet generator
Data Source
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AI summary
A brushless starter-generator system is contained within a single housing 10. The housing 10 has a first end 18 with an opening to receive a drive spline 16 from a motive source and an opposing second end 20. A brushless, rotating, machine 32 is located adjacent the first end 18 and is kinetically connectable to the drive spline 16. A power control unit 34 is adjacent the second end 20 and electrically coupled to the brushless, rotating machine 32. The brushless, rotating machine 32 is selected from the group consisting of a synchronous machine, a permanent magnet machine, and an induction machine. Electrical and mechanical interfaces are identical to a like-rated brushed version for a true "drop-in" replacement capability to facilitate replacements and up-grades.