Dual-Stator Generator Without IPT for 12-Pulse DC Quality
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Solution Overview
Problem
Traditional High Voltage Direct Current (HVDC) electrical power generator systems for aircraft require an Inter Phase Transformer (IPT), which increases generator weight and size due to the need for minimum commutation inductance, necessitating a solution to reduce weight while maintaining power quality.
Innovation Solution
A dual stator generator system with a first and second stator, each sized to achieve a predetermined generator commutation inductance equal to or above the critical commutation inductance, allowing parallel DC connection without an IPT, thereby reducing size and weight while maintaining desired DC 12-pulse power quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an Inter Phase Transformer (IPT) is used in traditional HVDC generator systems, then power quality is maintained, but generator weight and size increase
Solution Approach 1:
The patent removes the Inter Phase Transformer (IPT) from the generator system by designing the stator to provide sufficient commutation inductance on its own. This extraction of the IPT eliminates the need for this heavy component while maintaining the required 12-pulse power quality through the stator's intrinsic inductance properties.
Solution Approach 2:
The patent merges the commutation function previously performed by the separate IPT into the stator design itself. By integrating the commutation inductance requirement into the stator's physical dimensions and winding configuration, the system combines the stator's primary function with the commutation function that previously required a separate transformer.
2Weight of moving object
If generator size is reduced to decrease weight, then weight is reduced, but commutation inductance becomes insufficient
Solution Approach 1:
The patent changes the critical parameter of commutation inductance by optimizing the stator's physical parameters - specifically the number of turns, wire gauge, and winding configuration. These parameter changes allow the stator to provide sufficient commutation inductance (Lc) without requiring the addition of heavy IPT components, thus reducing weight while maintaining reliability.
3Weight of moving object
If stator size is reduced to minimize weight, then generator weight decreases, but DC power quality may be degraded
Solution Approach 1:
The patent optimizes stator parameters including the number of turns, wire cross-sectional area, and winding density to achieve the minimum weight while maintaining sufficient commutation inductance. By carefully adjusting these parameters, the stator provides the required Lc value that ensures 12-pulse power quality is maintained even without the IPT.
Solution Approach 2:
The patent uses finite element analysis and computational modeling to simulate and optimize the stator design before physical manufacturing. This virtual prototyping allows the design team to identify the optimal stator dimensions and winding parameters that minimize weight while ensuring the commutation inductance requirement is met, thereby guaranteeing power quality.
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 enables a significant reduction in generator size and weight while maintaining acceptable power quality, replacing the IPT with generator commutation inductance, resulting in improved power density and simplified assembly.
Implementation Method 1
A generator system can include a dual stator generator comprising a first stator and a second stator, a first rectifier operatively connected to the first stator to receive AC from the first stator
Data Source
AI summary
A generator system can include a dual stator generator comprising a first stator and a second stator, a first rectifier operatively connected to the first stator to receive AC from the first stator, a second rectifier operatively connected to the second stator to receive AC from the second stator, and a first DC output line and a second DC output line. The first rectifier and the second rectifier can be connected in parallel to the first DC output line and a second DC output line without an inter phase transformer (IPT) to output DC to the first DC output line and the second DC output line.