Electric motors for powering downhole tools
US7378769B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Sep 18, 2003 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | Jun 5, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K16/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric motor for powering downhole tools comprises a first stator (32) including a first set of coil windings (73), a second stator including a second set of windings, an axially located rotatable shaft (92) including a first magnetic element and a second magnetic element, a sealed annular chamber defined by a first tube (96), and an second tube concentrically inside the first tube. The first and second stators are located in the annular chamber, and the first magnetic elements being aligned with the first stator such that the first stator when energised can act upon the first magnetic element, and the second magnetic element being aligned with the second stator such that the second stator when energised can act upon the second magnetic element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.