Adjustable Coupler for Generator Phase Synchronization
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Solution Overview
Problem
The existing electrical power systems in aircraft require multiple bus breakers and physical separation of generators due to unsynchronized AC power outputs, leading to increased complexity, size, weight, and cost, as well as potential damage from circular currents if generators are not precisely aligned.
Innovation Solution
A method and system for detecting and controlling the phase angle between generators driven from a common drive source using an adjustable coupler mechanism and a controller to synchronize the angular phase shift, allowing generators to be connected on a common bus, thereby eliminating phase errors and circular currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If generators are mechanically aligned using indexing gears and keying shafts, then mechanical alignment is improved, but the tolerance is still insufficient to allow generators to be paralleled without precise synchronization
Solution Approach 1:
The patent replaces traditional mechanical synchronization methods (indexing gears and keying shafts) with an electrical sensing and control system. Phase sensors detect the electrical phase difference between generators, and a controller automatically adjusts the relative angular position of generator rotors using actuators, achieving precise synchronization without relying on mechanical tolerances alone
Solution Approach 2:
The synchronization system automatically detects phase errors and adjusts generator positions without manual intervention. The controller continuously monitors phase differences and commands actuators to correct misalignment, enabling the system to self-correct and maintain synchronization
2Reliability
If physical separation of generators is implemented with separate distribution buses, then generator protection is improved, but system complexity, size, weight, and cost increase
Solution Approach 1:
The patent merges previously separate distribution buses by enabling generators to be electrically paralleled through precise phase synchronization. This consolidation reduces the number of buses and breakers needed, simplifying the power distribution architecture while maintaining generator protection through controlled synchronization
3Device complexity
If generators are connected in parallel to a common bus, then system complexity is reduced, but precise phase synchronization is required to avoid circular currents and excessive heat dissipation
Solution Approach 1:
The patent implements a feedback control system where phase sensors continuously monitor the phase difference between paralleled generators, and the controller adjusts rotor positions based on detected errors. This closed-loop control ensures generators remain synchronized within tight tolerances, preventing circular currents and heat dissipation while allowing parallel connection
Data Source
AI summary
A system that selectively alters a phase angle of an electrical generator. The system has a powered input shaft for transmitting power and an output shaft for receiving power for delivery to the electrical generator. A coupler portion interconnects the input shaft with the output shaft and transmits power therebetween. The coupler portion is selectively moveable in an axial direction between a first axial position wherein the input shaft and output shaft are disposed at a first relative angular position, and a second axial position wherein the input shaft and output shaft are disposed at a second relative angular position different than the first position.