Motor controllers
US9455656B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 2013 |
| Grant date | Sep 27, 2016 |
| Priority date | — |
| Expiry date | Nov 27, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P21/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of estimating the position of a rotor of an electric motor comprises producing an output signal indicative of motor position using a position sensor which comprises a detector and at least one encoder which rotates along with the rotor of the motor and includes a plurality of encoding regions, the output signal of the sensor varying in a stepwise fashion as the encoding regions move past the detector, and passing the output of the sensor through a smoothing algorithm to produce an estimated position signal, the algorithm being arranged to smooth the transition between the steps in the output of the sensor by causing the estimated position signal to lag behind the output of the sensor following a step change in the output of the sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.