Brushless DC motor
US4220879A · kind A · utility
24Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1978 |
| Grant date | Sep 2, 1980 |
| Priority date | — |
| Expiry date | Jan 9, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K29/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a brushless DC motor, the rotor has a rotor shaft with a rotor yoke attached thereto and an annular rotor magnet mounted on the rotor yoke, the stator has a stator yoke with stator coils disposed on the stator yoke so as to face the rotor magnet, and two magnetic field sensing elements, such as, Hall elements, are provided for detecting the rotational position of the rotor. A printed wiring board and the stator coils are arranged on the same surface of the stator yoke so as to make the motor flat. The printed wiring board also serves as a thrust pad for the rotor shaft and provides a ground for the latter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.