Method and apparatus for applying a commutation advance automatically in a brushless DC motor
US8680799B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2011 |
| Grant date | Mar 25, 2014 |
| Priority date | — |
| Expiry date | May 16, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/157
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
To achieve peak acoustic and power performance, the coil or applied current should be in phase or substantially aligned with the back electromotive force (back-EMF) voltage. However, there are generally phase differences between the applied current and back-EMF voltage that are induced by the impedance of the brushless DC motor (which can vary based on conditions, such as temperature and motor speed). Traditionally, compensation for these phase differences was provided manually and on an as-needed basis. Here, however, a system and method are provided that automatically perform a commutation advance by incrementally adjusting a drive signal over successive commutation cycles when the applied current and back-EMF voltage are misaligned.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.