Method and system for determining a position of a rotor of an electric motor with noise reduction
US8796983B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2011 |
| Grant date | Aug 5, 2014 |
| Priority date | — |
| Expiry date | May 14, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A data storage device stores previous position readings of the rotor for a previous cycle of a pulse width modulation signal applied to the motor. A current raw position reading for the current cycle is received. A predicted position reading for a current cycle is determined based on at least one of the stored previous position readings of the previous cycle. A data processor determines whether a difference between the current raw position reading and the predicted position reading for a first mode and a second mode is within one or more preset thresholds. The data processor selects the current raw position reading as a verified reliable final position reading if a first difference for the first mode is equal to or less than a primary preset threshold or if a second difference for the second mode is equal to or less than a secondary preset threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.