Slow speed operation of brushless direct current motors by gating pulse width modulation drive
US8339077B2 · kind B2 · utility
5Cited by
3References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 26, 2010 |
| Grant date | Dec 25, 2012 |
| Priority date | — |
| Expiry date | Jul 14, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/182
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Slow speed operation of a brushless DC (BLDC) motor is enhanced by gating off some of the PWM pulses in each commutation period. By doing so, longer PWM pulse widths may be used at PWM signal frequencies that are inaudible while still allowing desired slow speed operation of the BLDC motor. Centering the non-gated PWM pulses in each commutation period where peak back EMF occurs, further reduces losses and improves delivery of maximum torque from the BLDC motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.