Motor control device and air conditioner
US9287820B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2015 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Feb 27, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/53876
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor control device includes a PWM signal generation unit configured to increase/decrease a duty in both directions of phase lag side and phase lead side regarding a first phase of three-phase PWM signal pattern. The PWM signal generation unit is configured to increase/decrease a duty in one of the directions of phase lag side and phase lead side regarding a second phase. The PWM signal generation unit is configured to increase/decrease a duty in a direction opposite to that of the second phase with reference to any phase of the carrier-wave period regarding a third phase. A timing point adjusting unit is configured to detect two-phase currents at timing points fixed in the carrier-wave period and to adjust a detection timing point so that the current is detectable at a variable timing point regarding at least one phase when the two-phase currents become undetectable at the fixed timing points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.