Elongated permanent magnet synchronous motor
AssigneeCamco International Inc.
InventorsJoseph C. Liu, Richard Savoie, Dale Smith
Life of this patent
Estimating the term…
Abstract
A permanent magnet synchronous motor system. The system uses a permanent magnet AC synchronous motor having an elongated housing, of the type used in progressive cavity pumping applications. Within the stator, a multi-section rotor is rotatably mounted. The rotor includes a plurality of rotor sections that are angularly offset from each other. The rotor sections are mounted on a drive shaft, and the sum of the offsets is generally comparable to the angular displacement undergone by the drive shaft under a normal operating load.
Claims22
A permanent magnet synchronous motor system, comprising:
- a permanent magnet synchronous motor having an elongated housing;
- a stator having a plurality of windings;
- and a rotor rotatably disposed within the stator, the rotor including a plurality of rotor sections, each rotor section including a plurality of permanent magnets, the permanent magnets of adjacent rotor sections being offset from each other a predetermined angular displacement, the plurality of rotor sections being mounted over a shaft with each rotor section rotatably fixed with respect to the shaft by a corresponding key and keyway, wherein the shaft includes a plurality of keyways, each keyway being at an axially unique location and being offset from each adjacent keyway by the predetermined angular displacement.
A permanent magnet motor downhole pumping system designed for use within a wellbore, comprising:
- a downhole pump;
- and
- a permanent magnet motor coupled to the downhole pump, wherein the downhole pump and the permanent magnet motor are designed for deployment in a wellbore to pump a wellbore fluid, and wherein the permanent magnet motor includes a plurality of rotor sections, each rotor section having a plurality of permanent magnets, the permanent magnets of adjacent rotor sections being offset from each other by a predetermined angular displacement, wherein the sum of the predetermined angular displacements between each rotor section is approximately equal to the angular twisting of the shaft under a standard load.
A progressive cavity pumping system, comprising:
- a progressive cavity pump;
- and
- a permanent magnet synchronous motor coupled to the progressive cavity pump, wherein the permanent magnet synchronous motor includes a plurality of rotor sections, each rotor section having a plurality of permanent magnets, the permanent magnets of adjacent rotor sections being offset from each other by a predetermined angular displacement, wherein the sum of the predetermined angular displacements between each rotor section is approximately equal to the angular twisting of the shaft under a standard load.
Dependencies are inferred from the claim text.