Low ripple-torque permanent magnet brushless motor
US4918346A · kind A · utility
14Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1988 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Jun 24, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K29/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The stator comprises three phase driving coils and an electric commutator for controlling current to the driving coils. The rotor comprises permanent magnets which are alternately magnetized in N polarity and S polarity. Driving torque is generated corresponding to the current flowing through the driving coils and the permanent magnets. On the surface of the permanent magnet facing to the driving coils, two non-magnetizing portions are provided in each permanent magnet having either N or S polarity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.