End coil tie downs
US8203250B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 2009 |
| Grant date | Jun 19, 2012 |
| Priority date | — |
| Expiry date | Aug 26, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K5/132
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A submersible electric pump motor comprises an unvarnished stator structure having stator windings formed of conductors. The stator windings form end coils at each end of the stator for each phase. The end coils are tied to three arc-shaped, metal segments, each having an opening and positioned circumferentially within a circumferential groove. The metal segments are welded to the interior of the housing to provide a rigid surface. High temperature strings are wound through the openings in each metal segment and around the end coils for each phase to tie each end coil of that phase to that metal segment. This prevents the end coils of each phase from twisting during startup, sliding into the slots, and moving inwards towards a rotating rotor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.