Sine modified trapezoidal drive for brushless DC motors
US9071172B2 · kind B2 · utility
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3References
19Claims
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Key dates
| Filing date | Aug 5, 2013 |
| Grant date | Jun 30, 2015 |
| Priority date | — |
| Expiry date | Dec 28, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2209/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pulse width modulated (PWM) trapezoidal commutation drive to a brushless direct current (BLDC) motor is sine modified so that the applied drive voltage substantially matches the induced voltage generated in the BLDC motor. The values of the cosine of the angles between −30 degrees and +30 degrees are used to modify the duty cycle of the PWM drive signal dependent upon the rotor angular positions determined from the times between the zero crossing BEMF voltages measured at the unconnected motor terminals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.