Starting system for an electrically-compensated constant speed drive
US4697090A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1986 |
| Grant date | Sep 29, 1987 |
| Priority date | — |
| Expiry date | Dec 23, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02N11/04
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Prior generating systems utilizing electrically-compensated constant speed drives (ECCSD) have typically required a separate starter motor for starting a prime mover which supplies motive power to the ECCSD, thereby increasing the size and weight of the system. In order to overcome this problem, a generating system is provided with circuitry coupled to the electrical power windings of a permanent magnet machine (PMM) forming a part of the ECCSD for causing the PMM to develop motive power which causes an output shaft of a differential of the ECCSD to rotate at increasing speeds. When the output shaft of the differential reaches a predetermined speed, a generator coupled to the output shaft of the differential is supplied external or ground power which in turn causes the generator to operate as a motor and return motive power through the differential to the prime mover to start same and bring it up to operating speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.