Aircraft engine starting with synchronous ac generator

Details Aircraft engine starting with synchronous ac generator Aircraft engine starting with synchronous ac generator

1982-05-27

1984-09-25

Truhe, J. V.

Prime-mover dynamo plants

Electric control

Electric-starting motor

123179D, 123179AS, 310122, 310156, F02N 1104, H02K 2360

Patent

active

044737521

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 the speed of the machine is such that the synchronous operation of an outside permanent magnet rotor (96) commences, the clutch (76) is utilized to disconnect the induction motor cartridge (70), leaving the rotor (96) to drive the drive spline (98) via internal splines (94).

REFERENCES:
patent: 1158597 (1915-11-01), Wadsworth
patent: 1620747 (1927-03-01), Allison
patent: 2192304 (1940-03-01), Gilliver
patent: 2897384 (1959-07-01), Muller

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