US6388353B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elongated permanent magnet synchronous motor
Assignee: Camco International Inc
•
Filing: 2000-03-30
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Granted: 2002-05-14
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Expires: 2020-03-30
Abstract
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.
Inventors
- 👤 Joseph C. Liu
- 👤 Richard Savoie
- 👤 Dale Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:01
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/278; F; F04; F04B; F04B13/00; F04B17/00; F04B17/03; F04B17/04; F04B17/042; H02K16/00; H02K16/02; H02K21/00; H02K21/12; H02K21/14; H02K21/16; H02K2201/00; H02K2201/06
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
119 words
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.
Claim 2
Dependent Claim
119 words
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.
Claim 3
Dependent Claim
25 words
The permanent magnet synchronous motor system as recited in claim 1 , further comprising a progressive cavity pump powered by the permanent magnet synchronous motor.
Claim 4
Dependent Claim
24 words
The permanent magnet synchronous motor system as recited in claim 2 , further comprising a motor protector coupled to the permanent magnet synchronous motor.
Claim 5
Dependent Claim
26 words
The permanent magnet synchronous motor system as recited in claim 3 , further comprising a variable speed drive electrically connected to the permanent magnet synchronous motor.
Claim 6
Dependent Claim
36 words
The permanent magnet synchronous motor system as recited in claim 4 , wherein the variable speed drive is at a location remote from the permanent magnet synchronous motor and the permanent magnet synchronous motor is self-starting.
Claim 7
Dependent Claim
34 words
The permanent magnet synchronous motor system as recited in claim 5 , wherein the permanent magnet synchronous motor is positioned in a wellbore and the variable speed drive is positioned outside of the wellbore.
Claim 8
Dependent Claim
37 words
The permanent magnet synchronous motor system as recited in claim 1 , wherein the permanent magnets of adjacent rotor sections are offset by offsetting each corresponding key and keyway relative to the next adjacent key and keyway.
Claim 9
Dependent Claim
32 words
The permanent magnet synchronous motor system as recited in claim 7 , wherein each rotor section includes a keyway disposed at a unique angular position relative to the rotor section's permanent magnets.
Claim 10
Dependent Claim
112 words
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.
Claim 11
Dependent Claim
112 words
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.
Claim 12
Dependent Claim
43 words
The permanent magnet motor downhole pumping system as recited in claim 9 , further comprising: a power supply able to output a three-phase alternating current; a variable speed drive; and a power cable connecting the variable speed drive to the permanent magnet motor.
Claim 13
Dependent Claim
24 words
The permanent magnet motor downhole pumping system as recited in claim 10 , wherein the permanent magnet motor is an eight pole, self-starting motor.
Claim 14
Dependent Claim
31 words
The permanent magnet motor downhole pumping system as recited in claim 11 , wherein the permanent magnet motor includes a drive shaft on which the plurality of rotor sections are mounted.
Claim 15
Dependent Claim
29 words
The permanent magnet motor downhole pumping system as recited in claim 9 , wherein the drive shaft includes a plurality of keyways that are angularly offset from each other.
Claim 16
Dependent Claim
33 words
The permanent magnet motor downhole pumping system as recited in claim 9 , wherein each rotor section includes a keyway disposed at a unique angular position relative to the rotor section's permanent magnets.
Claim 17
Dependent Claim
22 words
The permanent magnet motor downhole pumping system as recited in claim 9 , wherein the power supply comprises a variable speed drive.
Claim 18
Dependent Claim
86 words
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.
Claim 19
Dependent Claim
86 words
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.
Claim 20
Dependent Claim
32 words
The progressive cavity pumping system, as recited in claim 16 , wherein the rotational speed of the permanent magnet synchronous motor and the progressive cavity pump are generally at a 1:1 ratio.
Claim 21
Dependent Claim
23 words
The progressive cavity pumping system, as recited in claim 17 , further comprising a motor protector coupled to the permanent magnet synchronous motor.
Claim 22
Dependent Claim
22 words
The progressive cavity pumping system, as recited in claim 18 , further comprising a thrust chamber coupled to the progressive cavity pump.
Claim 23
Dependent Claim
25 words
The progressive cavity pumping system, as recited in claim 17 , further comprising a variable speed drive electrically connected to the permanent magnet synchronous motor.
Claim 24
Dependent Claim
30 words
The progressive cavity pumping system, as recited in claim 17 , wherein the permanent magnet synchronous motor includes a drive shaft on which the plurality of rotor sections are mounted.
Claim 25
Dependent Claim
31 words
The progressive cavity pumping system, as recited in claim 16 , wherein each rotor section includes a keyway disposed at a unique angular position relative to the rotor section's permanent magnets.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-05-13 | 2005-11-12 | 2006-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-05-13 | 2009-11-12 | 2010-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-05-13 | 2013-11-12 | 2014-05-14 | $7700.00 | Window Closed / Lapsed |