Method and apparatus for controlling PWM inverter
US4611158A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1984 |
| Grant date | Sep 9, 1986 |
| Priority date | — |
| Expiry date | Feb 27, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P21/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An AC motor such as an induction motor or a synchronous motor is driven by a PWM inverter. Turn-on of the PWM inverter is controlled by PWM pulse signals obtained as a result of comparison between voltage command signals (a modulation signal) and a carrier wave signal. The voltage command signals are obtained as a function of errors between current command signals and detected current signals. Ripples included in the voltage command signals are so suppressed as to be decreased as the rotation speed of the AC motor becomes lower. By so suppressing the ripples, the level of noise generated from the motor can be reduced especially when the motor operates in a low-speed rotation range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.