AC motor control apparatus
US9024553B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2013 |
| Grant date | May 5, 2015 |
| Priority date | — |
| Expiry date | Jun 16, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P21/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control apparatus of an AC motor improves an electric current estimation accuracy of the AC motor, which includes a three phase motor with an electric current detector to detect an electric current detection value of one of the three phases (a sensor phase). The control apparatus includes an electric current estimation unit that repeatedly performs an inverted dq conversion and a dq conversion. The inverted dq conversion calculates an electric current estimate values for phases other than the sensor phase based on the d/q axis electric current estimate values of a previous cycle. The dq conversion calculates the d/q axis electric current estimate values of a current cycle in a rotation coordinate system of the AC motor based on the electric current estimate values calculated by the inverted dq conversion and the electric current detection value of the sensor phase detected by the electric current detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.