Single-phased powered drive system
US6472844B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 2001 |
| Grant date | Oct 29, 2002 |
| Priority date | — |
| Expiry date | Mar 19, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0022
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drive system including a rectifier, a high-frequency filter, a static inverter and an induction motor is driven without energy stores and fed by the single-phase mains, in which the use of an envelope generator with a mains-synchronous, preferably sinusoidal signal causes a preferably sinusoidal envelope to be sign-superimposed on the static inverter output signal, thus preventing inadmissible current overshoots in the single-phase mains. Possible fluctuations of the intermediate circuit voltage are thereby compensated. The advantageous operating frequency of the static inverter may be adjusted automatically by a PLL control circuit in that the phase shift between intermediate current and the envelope signal is evaluated. The advantageous operating frequency may be gained by adding a given frequency difference to the rotational speed of the motor. The envelope directly represents a projection of the variation of the voltage of the single-phase mains.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.