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):

Report Date:

1986-02-25

Pagination or Media Count:

13.0

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 motorgenerator 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.

Subject Categories:

  • Aircraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE