Brushless DC motor
US5710474A · kind A · utility
43Cited by
15References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 26, 1995 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | Jun 26, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K16/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved, brushless, slot-less DC motor is disclosed which includes a plurality of ring shaped permanent rotor magnets affixed to the motor shaft and magnetized to have contiguous pole faces extending about the circumference thereof. A module plastic housing impregnated with powder metal particles is provided as a magnetic shunt to eliminate prior art ferrite-oxide laminations while assuring concentration of the rotor's magnetic flux into coils positioned in the physical air gap between the rotor and stator housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.