Magnetic gear for use with wellbore instruments
US9080386B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2012 |
| Grant date | Jul 14, 2015 |
| Priority date | — |
| Expiry date | Jul 26, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2207/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A wellbore rotating instrument system includes a source of rotational energy for transmission thereof to within a wellbore. At least one magnetic gear assembly is coupled at its input to an output of the source. A rotating load is coupled at its input to a rotational output of the magnetic gear assembly. The at least one magnetic gear assembly comprises a housing, a stator disposed in the housing proximate an inner wall thereof, a second shaft rotatably supported on bearings disposed at longitudinally spaced apart locations inside the housing and a first shaft rotatably supported inside the output shaft. The stator comprises a plurality of magnets disposed in generally circular laminations. The second shaft comprises a non-magnetic, electrically non-conductive body and a plurality of pole pieces disposed circumferentially therearound. The first shaft comprises magnets disposed around its exterior circumference and shaped to fit rotatably within the second shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.