Driving brushless DC (BLDC) motors
US8456117B2 · kind B2 · utility
3Cited by
38References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 4, 2006 |
| Grant date | Jun 4, 2013 |
| Priority date | — |
| Expiry date | Jan 1, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2209/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A driving system for a tri-polar electric motor comprises three phase windings. Winding drivers drive each winding with a driving waveform having a non-zero driving phase and intervals wherein the input is equal to zero at the start, middle and end of each driving phase. Using a driving waveform of this type enables monitoring of the back EMF in the winding during each interval when the input is equal to zero. This enables regular monitoring of the zero crossing point of each winding and hence of the position of the rotor. This enables the motor to operate efficiently without generating a torque ripple.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.