US5142180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current motor for operation at elevated temperatures in a hostile environment
Assignee: Shell USA Inc
•
Filing: 1990-10-19
•
Granted: 1992-08-25
•
Expires: 2010-10-19
Abstract
Abstract A permanent magnet motor for operation at elevated temperatures wherein the magnets are clamped to the motor shaft by means of high temperature plastic bushings. The bushings have a coefficient of thermal expansion that exceeds the coefficient of thermal expansion of the motor shaft.
Inventors
- 👤 Boyd B. Moore
- 👤 Moye Wicks, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:15
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/14; H02K1/00; H02K1/06; H02K1/12; H02K1/16; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/2726; H02K1/2733; H02K5/00; H02K5/04; H02K5/12; H02K5/132
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
167 words
A permanent magnet motor for operation at temperatures above 100° C., comprising: a stator having at least one winding; a motor shaft, said shaft being rotatably mounted for rotation within said stator; a cylindrical-shaped permanent magnet having at least a pair of poles, said magnet being disposed on said motor shaft; a pair of bushings, said bushings being disposed in the ends of said magnet to firmly clamp said magnet to said motor shaft, said bushings being formed of a material that has a larger coefficient of thermal expansion than either said magnet or said motor shaft; a cylindrical lamination extending the length of the stator, the cylindrical lamination being functional to support and hold the stator in alignment concentric with the shaft and to control a magnetic field produced by the magnet; and a pair of rings located at opposite ends of cylindrical lamination, the rings being functional to secure the cylindrical lamination in position, said rings being formed of the same material as said bushings.
Claim 2
Dependent Claim
167 words
A permanent magnet motor for operation at temperatures above 100° C., comprising: a stator having at least one winding; a motor shaft, said shaft being rotatably mounted for rotation within said stator; a cylindrical-shaped permanent magnet having at least a pair of poles, said magnet being disposed on said motor shaft; a pair of bushings, said bushings being disposed in the ends of said magnet to firmly clamp said magnet to said motor shaft, said bushings being formed of a material that has a larger coefficient of thermal expansion than either said magnet or said motor shaft; a cylindrical lamination extending the length of the stator, the cylindrical lamination being functional to support and hold the stator in alignment concentric with the shaft and to control a magnetic field produced by the magnet; and a pair of rings located at opposite ends of cylindrical lamination, the rings being functional to secure the cylindrical lamination in position, said rings being formed of the same material as said bushings.
Claim 3
Dependent Claim
37 words
The motor of claim 1 wherein said bushings have a central bore that is an interference fit on said motor shaft and an over all diameter that is an interference fit in the ends of said magnet.
Claim 4
Dependent Claim
18 words
The motor of claim 1 wherein said bushings and said rings are formed of a high temperature polymer.
Claim 5
Dependent Claim
13 words
The motor of claim 3 wherein said high temperature polymer is a polyimide.
Claim 6
Dependent Claim
51 words
The motor of claim 1 including housing enclosing said motor, said housing facilitating use of the motor down-hole in an oil or gas well, and passages in said housing functional to provide a flow path for purge gas useful to pressurize the motor housing to exclude borehole fluids from the housing.
References Cited (Backward Citations)
US2080678A
Cited
US2303893A
Cited
US2767339A
Cited
US2727164A
Cited
US2831992A
Cited
US2919357A
Cited
US3143675A
Cited
US3082338A
Cited
US3164735A
Cited
US3604964A
Cited
US3792299A
Cited
US3953752A
Cited
US3881243A
Cited
US4035677A
Cited
US3983435A
Cited
US4035676A
Cited
US4206379A
Cited
US4641422A
Cited
US4392073A
Cited
US4472650A
Cited
US4487299A
Cited
US4661736A
Cited
US4984745A
Cited
US4644202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |