Electric motor
US5068554A · kind A · utility
13Cited by
3References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 30, 1989 |
| Grant date | Nov 26, 1991 |
| Priority date | — |
| Expiry date | Aug 30, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/128
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric motor suitable for incorporation in pipestacks for drilling and pumping applications has a drive shaft (4) carrying spaced rotor discs (6) driven by annular stator windings (7) carried by the motor housing wall. The windings (7) are organized as linear motors operating on a circular path and provision can be made for energization of the windings so as to cause axial movement of the shaft, for hammering or braking action. The shaft (4) can be tubular to provide a passage for drilling mud, or for a fluid being pumped.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.