Aircraft Generator Winding Phase Shift for Low-Ripple Power
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Solution Overview
Problem
Aircraft electric generators face challenges in providing electrical power with reduced ripples while minimizing the weight of the electrical system, as existing generators require large capacitors to mitigate ripple issues, leading to increased weight.
Innovation Solution
The electric generator assembly incorporates a main generator with a main rotor and stator featuring a first and second three-phase winding, where the first three-phase winding defines a phase shift greater than zero degrees from the second, reducing harmonics and allowing for smaller capacitors, thus minimizing weight and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If large capacitors are included to minimize output ripples, then the ripple reduction is improved, but the weight of the electrical system increases
Solution Approach 1:
The patent changes the electrical parameters by introducing a phase shift between two three-phase windings in the stator. This parameter change modifies the harmonic content of the generated voltage, reducing ripple without requiring large capacitors. The phase shift transforms the waveform characteristics to achieve smoother output.
Solution Approach 2:
The stator is segmented into two separate three-phase windings with different phase shifts relative to the rotor. By dividing the winding structure and combining their outputs, the patent achieves ripple reduction through constructive interference of harmonics, eliminating the need for large filtering capacitors.
2Object-generated harmful factors
If traditional single three-phase winding is used, then the device complexity is low, but the output ripple is large requiring large capacitors
Solution Approach 1:
The patent merges two three-phase windings in the stator, each producing voltage with a different phase shift relative to the rotor. By combining these two winding sets in parallel, the harmonics cancel each other out, reducing output ripple while maintaining a relatively simple overall 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
This configuration reduces the need for heavy capacitors, decreasing the overall weight and enhancing the efficiency of the electrical system by minimizing harmonics in the power output, allowing for a lighter and more efficient electrical system.
Implementation Method 1
the main stator comprising a first three-phase winding and a second three-phase winding, the first and second three-phase windings each configured to have a voltage induced therein by the main rotor
Data Source
AI summary
An electric generator assembly for an aircraft is provided. The electric generator assembly includes: a main generator having a main rotor and a main stator, the main stator includes a first three-phase winding and a second three-phase winding, the first and second three-phase windings each configured to have a voltage induced therein by the main rotor, the first three-phase winding defining a phase shift from the second three-phase winding greater than zero degrees.