Control apparatus for electric motor
US6696812B2 · kind B2 · utility
30Cited by
7References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2001 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Feb 5, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S903/916
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control apparatus controls a voltage applied to an AC motor from a power converter with a PWM signal, and has two different magnetic pole position-estimating units which estimate a rotor magnetic pole position of the AC motor, and has a switching unit which selects any one of these two kinds of magnetic pole position-estimating units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.