Accession Number : ADD012256

Title :   Constant Speed Drive with Compensation Using Differential Gears.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Borger,William U

Report Date : 25 Feb 1986

Pagination or Media Count : 13

Abstract : The electrical supply system on aircraft may employ a constant speed drive to convert variable engine speed to constant speed for operation of synchronous 400 Hz electrical generators. The heart of these devices is a differential which mechanically sums the input of two shafts and outputs this sum to a third shaft. Connected to this third shaft is a constant speed synchronous generator. Connected to one of the input shafts is the turbine generator. The second input shaft is connected to a speed compensating drive which accounts for engine speed changes. The speed compensating device disclosed in this patent is an electrically compensating motor/generator arrangement. Bidirectional power flow in the electric compensation link uses two high-speed, permanent-magnet, three-phase machines interconnected by a power conditioning network. One machine is operated as a brushless dc machine, while the other functions as a variable speed synchronous machine. Steady-state performance of two types of power conditioning are presented-a dc link inverter and a cycloconverter link.

Descriptors :   *PATENTS, *SPEED REGULATORS, *AIRCRAFT EQUIPMENT, DRIVE SHAFTS, ELECTRIC GENERATORS, GEARS, DIFFERENTIALS(MECHANICAL), POWER CONDITIONING

Subject Categories : Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE