Electric motor control apparatus and electric motor control method
US11855566B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2020 |
| Grant date | Dec 26, 2023 |
| Priority date | — |
| Expiry date | Sep 18, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P21/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric motor control apparatus that alternately switches modulation mode between an asynchronous PWM control, which controls an electric motor by fixing a PWM frequency, and a synchronous PWM control, which controls the electric motor by making the PWM frequency proportional to a drive frequency of the electric motor, wherein when switching the modulation mode, a compensation value is calculated based on a state quantity, which correlates with a component in a rotating coordinate system of a voltage applied to the electric motor and is obtained immediately before switching, and the voltage immediately after switching is compensated for by the compensation value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.