Electric constant speed/variable speed drive/generator assembly

Details Electric constant speed/variable speed drive/generator assembly Electric constant speed/variable speed drive/generator assembly

1981-02-17

1984-12-11

Truhe, J. V.

Prime-mover dynamo plants

Plural prime mover

Plural prime movers with fluid interconnection

290 6, 322 40, H02P 900

Patent

active

044880537

ABSTRACT:
The invention is an "electric" constant speed/variable speed drive/generator assembly (10), which finds use in aircraft, and in particular, in "all-electric" aircraft. The assembly (10) includes a planetary differential (20) whose output is controlled by a "make-up" induction motor (12). The induction motor (12) includes a squirrel-cage rotor (14) which is rotatable about a rotor-shaped stator (16). The assembly also includes a primary power generator (30) which includes a permanent magnet rotor (18) and an output winding (22). The rotor (18) is co-axial with and rotatable about, the outside of the rotor (14). The outer rotor (18) is driven by the planetary differential (20) in such a manner that the planet-carrier (24) is driven by the aircraft's engine, the ring-gear (26) drives the generator (30), and the sun-gear (32) is connected to the induction motor (12). Constant speed operation of the device is effective when the band-brake (34) is "off" and the induction motor (12) rotates at a speed, and in a direction, to compensate for the in-flight variations of the engine input-speeds to the planetary differential (20). When the band-brake (34) is "on," the sun-gear (32) is locked and the differential acts as a fixed ratio transmission. The result is a dual-speed range all-electric drive which enables the generator (30) to provide constant voltage/constant frequency or variable voltage/variable frequency power (proportional to engine speed).

REFERENCES:
patent: 2597357 (1952-05-01), McCormick
patent: 3056914 (1962-10-01), Potter
patent: 3974396 (1976-08-01), Schonball

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