Double differential, electrically compensated constant speed drive
US4734626A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1986 |
| Grant date | Mar 29, 1988 |
| Priority date | — |
| Expiry date | Dec 23, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/72
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrically compensated constant speed drive (ECCSD) according to the present invention includes a pair of power transmission paths between the prime mover and a load wherein each power transmission path includes a mechanical differential having a first input coupled to the output of the prime mover and an output coupled to the load. A second input of each of the differentials is coupled to a permanent magnet machine and a power converter interconnects the electrical power windings of the permanent magnet machines. In operation, one of the permanent magnet machines is always operated as a generator while the other permanent magnet is operated as a motor so that power flow through the power converter is unidirectional. The ECCSD of the present invention results in a substantial reduction in the maximum control power and hence efficiency is increased and complexity is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.