Brushless motor having a field magnet, a portion of which is used for detecting the rotor's position
US5744894A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1996 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | Oct 21, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S310/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A brushless motor is provided. The brushless motor of the present invention includes a shaft, a rotor, having a plurality of field magnets attached thereto, fixed to the shaft, a stator for forming a magnetic field to enable rotation of the rotor, a housing in which the rotor and stator are installed, and a motor driving unit, wherein the arc length of a portion of the field magnet used for detecting the position of the rotor and that of the remaining portion thereof are formed to be different from each other. According to the brushless motor of the present invention, it is possible to increase efficiency of the brushless motor and to reduce manufacturing costs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.