Motor apparatus
US6538404B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2001 |
| Grant date | Mar 25, 2003 |
| Priority date | — |
| Expiry date | Feb 13, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/21
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor apparatus, such as a DC brushless motor, is provided for the obtaining a position detection signal by detecting the intersection of the divided voltage of a bus voltage and three phases of the divided voltage of the three phases by a comparator which results in the central position of a flat portion. For the divided voltage for the three phases of the respective positive terminal of the comparator, the comparison voltage obtained by dividing the voltage between the divided voltage for the three phases of the following phase in the order and the divided voltage of the bus voltage is applied to the respective negative terminal. As the comparison voltage is phase shifted, the position can be detected by making a slant position ahead of the flat point of the intersection. When the comparison voltage obtained by dividing the voltage between the divided voltage for the three phases of the preceding phase in the order and the divided voltage of the bus voltage is applied to the respective negative terminal, as the phase is shifted in the opposite direction, the position can be detected by making a slant position near the flat point of the intersection. Thereby, the motor apparatus…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.