Permanent magnet motor control for electric subsea pump
US10263547B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 9, 2015 |
| Grant date | Apr 16, 2019 |
| Priority date | — |
| Expiry date | Oct 31, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/01
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method includes monitoring electrical output in an open control loop from a variable speed drive to a remote permanent magnet motor, the variable speed drive electrically connected to the permanent magnet motor via a power transmission line. The method includes, in response to detecting a variation in the electrical output at the variable speed drive, synchronizing a frequency of a rotor shaft of the permanent magnet motor with a constant electromagnetic field frequency of a stator of the permanent magnet motor for a predetermined period of time. After the predetermined period of time, the method includes increasing the electromagnetic field frequency of the stator to an operational frequency threshold to accelerate the frequency of the rotor shaft of the permanent magnet motor. In response to reaching the operational frequency threshold, the method includes determining an internal position of the rotor based on the variable electromagnetic field frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.