Variable-speed drive for control of induction generators
US4401938A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 29, 1980 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Dec 29, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2101/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention is an aircraft power generation system which utilizes an induction-machine (G.sub.1) as a primary generator of variable-voltage/variable-frequency power. The induction-machine (G.sub.1) is directly driven by the engine (14) and is excited by an excitation-generator (G.sub.2) such that the induction-machine (G.sub.1) operates in a generating mode. A variable-speed drive (20), shown as a toroidal drive (30), controls the excitation frequency of the induction-machine (G.sub.1) such that the negative slip-frequency is controlled as a function of the input speeds (N.sub.1), (N.sub.2) and the electric load on the generator. Control of the toroidal drive (30) and thus speed (N.sub.2) is accomplished by a negative-slip control circuit which includes a drive control logic circuit (36), a proportional actuator (34), a control-start panel (48), and a steering mechanism (32). In another aspect of the invention, the induction-machine (G.sub.1) operates in a start-mode to start the engine (14). In this mode of operation, after engine starting is initiated from control-start panel (48), a start-logic circuit (52) establishes a programmed voltage/frequency output from a start-power e…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.