Electric motor drive device and air conditioner
US11177756B2 · kind B2 · utility
0Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2018 |
| Grant date | Nov 16, 2021 |
| Priority date | — |
| Expiry date | Mar 8, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P29/032
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric motor drive device includes a wire-connected-state switching unit to switch a wire connected state of stator windings of an electric motor to either a delta connected state or a star connected state, an inverter to drive the electric motor, and a relay-voltage detection circuit to detect a relay voltage (VR) that is a power-supply voltage of the wire-connected-state switching unit, and to deactivate the inverter when the relay voltage (VR) is decreased below a threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.