System and method for attenuating noise associated with a back electromotive force signal in a motor
US7256564B2 · kind B2 · utility
38Cited by
57References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 29, 2005 |
| Grant date | Aug 14, 2007 |
| Priority date | — |
| Expiry date | Sep 29, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2209/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for attenuating switching noise from back electromotive force (EMF) observations in a motor is described. The motor is controlled by pulse width modulation (PWM) signals provided at a PWM frequency. The method comprises sampling back EMF observed in the motor at a sampling frequency at least two times greater than the PWM frequency to obtain over-sampled back EMF readings; and filtering the over-sampled back EMF readings to remove switching noise and obtain cleaned back EMF observations. A system implementing the method is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.