System and method for commutating a motor using back electromotive force signals
US7477034B2 · kind B2 · utility
43Cited by
46References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 28, 2007 |
| Grant date | Jan 13, 2009 |
| Priority date | — |
| Expiry date | Mar 28, 2027 |
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. The oversampled readings may be used in a raw or filtered form to commutate the motor. A system implementing the method is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.