Aircraft engine starting with synchronous ac generator
US4473752A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 27, 1982 |
| Grant date | Sep 25, 1984 |
| Priority date | — |
| Expiry date | May 27, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05B2220/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a starter-generator machine (10) for starting turbine type aircraft engines. The machine combines an induction motor with a synchronous samarium cobalt generator. In the machine, a rotor-shaped stator (22) is fixed and positioned inside a squirrel-cage induction rotor (18) which has an array of samarium-cobalt magnets (24) attached on the outer diameter thereof. The compound dual machine operates as a starter by using the induction rotor to accelerate the permanent magnet rotor, and thus the aircraft engine via a drive pinion (34), up to some low synchronous speed, when ac power is applied to the outside stator (16) to lock in the permanent-magnet rotor (24) synchronously with the rotating field created in the stator (16) of the synchronous generator. As the speed of the rotor (24) is then increased, the engine speed is also increased via the drive pinion (34). In a second embodiment, a cartridge type induction-motor (70) is utilized to initially start an aircraft engine. The motor (70) includes a gear reduction (74) and a disconnect clutch (76) and drives the engine through a splined pinion (78) which in turn drives an engine connected spline (98). When th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.