Brushless DC motor
US6335578B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 20, 2000 |
| Grant date | Jan 1, 2002 |
| Priority date | — |
| Expiry date | Apr 20, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K29/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a brushless DC motor comprising a stator provided with a plurality of coils, a rotor magnet magnetized so as to possess a plurality of magnetic poles and rotatably disposed as opposed to the coils of the stator, and a magnetic sensor which detects the magnetic poles of the rotor magnet, in which the electric current supplied to said coils of respective phases is controlled based on a detection signal from said magnetic sensor so that the rotor magnet is rotationally driven, the magnetic sensor comprises in combination a giant magnetoresistive element disposed as opposed to the rotor magnet and a magnet disposed on a rear side of the giant magnetoresistive element. The giant magnetoresistive element is formed of a magnetic particle dispersion type giant magnetoresistive material, an artificial lattice type giant magnetoresistive material, or a colossal magnetoresistive material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.