Inverter device and current limiting method therefor
US6804130B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 10, 2003 |
| Grant date | Oct 12, 2004 |
| Priority date | — |
| Expiry date | Jan 10, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P27/047
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
It is an object of the invention to provide an inverter apparatus capable of instantaneously limiting a current to prevent the breakdown of a device and operating an electric motor efficiently and stably.The invention provides an inverter apparatus for carrying out a PWM modulation to output a voltage based on a voltage command vector obtained from a frequency command value Fref and a voltage command value calculated from the frequency command value by a V/f operation 7, comprising current detecting means 12a for detecting a current vector having a magnitude I1 of a current and a current phase &thgr;i, voltage limitation value calculating means 15 for calculating a voltage limitation value &Dgr;V which is proportional to an excess when the magnitude of the current exceeds a current limitation value Imax, voltage limitation vector calculating means 16 for converting the voltage limitation value into voltage limitation vectors &Dgr;Vq and &Dgr;Vd based on the current phase, voltage correcting means 17 for adding the voltage limitation vector to the voltage command vector, and acceleration correcting means 11 for correcting an acceleration command of a frequency based on the voltage l…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.