Brushless motor having permanent magnets
US5821710A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1997 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Sep 19, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K29/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A brushless motor having permanent magnets that can be used as a prime mover for automobiles, in place of internal combustion engines, since the motor can yield high torque during low-speed rotation, as in the case of conventional types of brushless motors and can be used at high torque and with excellent motor efficiency at rotations three times as high as that of conventional types. The brushless motor having permanent magnets according to the invention comprises PA1 a stator having a plurality of stator magnetic poles and a winding for generating a rotating field in the stator magnetic poles, PA1 a rotor having a rotating shaft and field permanent magnets rotating with respect to the stator magnetic poles, PA1 a control circuit for detecting the position of magnetic poles of the field permanent magnet with respect to the stator and feeding current to the winding in accordance with the position; wherein PA1 the field permanent magnets comprise a first field permanent magnet having magnetic poles of different polarities alternately arranged in the direction of rotation, and a second field permanent magnet that is adapted to be rotatable with respect to the first field permanent ma…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.