Method for starting and operating a BLDC motor and BLDC motor
US11177744B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 28, 2018 |
| Grant date | Nov 16, 2021 |
| Priority date | — |
| Expiry date | Oct 12, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P1/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A BLDC motor and a method for starting and operating the motor. The motor has a rotor with exciter magnets, a stator with at least three stator coils, and a control and evaluation unit. The method carries out an initialization phase with a defined start time, initial starting field angle of the stator magnetic field and angle rising rate. A partial cycle is carried out with a rising phase that increases a current field angle with a change in voltage application to the stator coils. An analysis phase keeps the current field angle constant. The method continuously records a difference in current between two phase currents of a same direction of flow, the evaluation unit analyzes the recorded difference for the presence of a current eye. Immediate commutation takes place when a current eye is detected or where without detection after a pre-definable time interval has elapsed. The analysis phase is terminated after commutation is carried out. The partial cycle is repeatedly carried out until the final field angle has increased to a value of 360° to define a total cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.