Constant speed drive to control variable APU speed and constant generator output frequency
US11697998B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 2022 |
| Grant date | Jul 11, 2023 |
| Priority date | — |
| Expiry date | Apr 8, 2042 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05D2270/56
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An aircraft power system includes an auxiliary power unit (APU), a generator, and a constant speed drive (CSD). The APU drives an APU drive shaft at a first rotational speed during a first condition and a second rotational speed during a second condition. The generator is rotatably coupled to a generator shaft and produces an AC voltage having a target frequency in response to rotation of the generator shaft at a target rotational speed. The CSD unit receives the first rotational speed from the APU drive shaft and rotates the generator shaft at the target rotational speed based on the first rotational speed. The CSD further receives the second rotational speed from the APU drive shaft and rotates the generator shaft at the target rotational speed based on the second rotational speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.