Variable speed, constant frequency induction generator system
US3982170A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 1975 |
| Grant date | Sep 21, 1976 |
| Priority date | — |
| Expiry date | Nov 28, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P9/46
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The disclosed voltage generating system includes certain known components, such as an induction machine driven as a generator, the output connections of which are coupled to the normal load connections of a switching system, which can be a bridge-type inverter. The system switching frequency f.sub.1 is regulated by firing pulses from a logic circuit in turn controlled by an oscillator. By controlling operation of the inverter switches with respect to the synchronous frequency (mechanical rotational speed) of the machine, a d-c voltage is provided on the normal inverter bus conductors. In the disclosed system the conventional inverter switches (such as SCR's) are replaced by true two-way power switches, capable of passing current in either direction. In addition the firing signals provided by the usual logic circuit and applied to these power switches are modified so that the switching occurs as a function not only of the first oscillator frequency f.sub.1 but also of signals received from a second oscillator at a frequency f.sub.2. In brief, the switching is accomplished with a gate circuit including an exclusive OR arrangement, fed by both the first and second oscillators, to prod…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.