Method and system for controlling an electric motor with compensation for time delay in position determination
US8723460B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2011 |
| Grant date | May 13, 2014 |
| Priority date | — |
| Expiry date | Apr 12, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P21/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A sensor detects position data for a rotor of the motor at a first time. A data processor receives the detected position data associated with a first time delay. A sensing circuit senses an analog current at the motor during a second time delay. An analog-to-digital converter converts the analog current to a digital current data during a third time delay. The fourth time delay is detected between actual current reading instant and position reading instant in a data processor. The digital phase current data is transformed into measured direct and quadrature axes control current data based on synchronization or temporal alignment of the position data with the actual measured analog phase current at the starting time by compensating the position data by a sum of the second time delay, the third time delay and the fourth time delay, where the first time delay is subtracted from the sum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.