Patent US5037003A successfully refreshed from Google Patents.
Patent US4862024A successfully refreshed from Google Patents.
US4862024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat dissipation in an electric motor
Assignee: RTX Corp
•
Filing: 1987-12-14
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Granted: 1989-08-29
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Expires: 2007-12-14
Abstract
Abstract A fusible, thermally conductive material (50) within which coils (40) of electric motor (10) are packed, cools the coils by melting and rejecting the heat of fusion thereof to the motor's stator core (20).
Inventors
- 👤 Frederick W. Stingle
- 👤 Samuel Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:08
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
108 words
In an electric motor having a stator and a rotor disposed within said stator for rotary movement with respect thereto, said stator comprising a core accommodating coils of electrically conductive material therewithin, the improvement characterized by: said coils being packed in a fusible, thermally conductive material, said thermally conductive material being fusible by heat induced within said coils in response to the energization thereof and solidifiable when cooled by the conduction of heat therefrom into said stator core, thereby rejecting the heat of fusion of said material into said stator core for enhancing the cooling, as well as the electrical input and torque output capabilities of said motor.
Claim 2
Dependent Claim
108 words
In an electric motor having a stator and a rotor disposed within said stator for rotary movement with respect thereto, said stator comprising a core accommodating coils of electrically conductive material therewithin, the improvement characterized by: said coils being packed in a fusible, thermally conductive material, said thermally conductive material being fusible by heat induced within said coils in response to the energization thereof and solidifiable when cooled by the conduction of heat therefrom into said stator core, thereby rejecting the heat of fusion of said material into said stator core for enhancing the cooling, as well as the electrical input and torque output capabilities of said motor.
Claim 3
Dependent Claim
23 words
The motor of claim 1 characterized by said motor comprising a brushless d.c. motor having rare earth magnets disposed in said rotor thereof.
Claim 4
Dependent Claim
14 words
The motor of claim 1 characterized by said thermally conductive material comprising a wax.
Claim 5
Dependent Claim
14 words
The motor of claim 1 characterized by said thermally conductive material comprising a grease.
Claim 6
Dependent Claim
28 words
The motor of claim 1 characterized by an annular seal disposed about the inner periphery of said stator for the radial retention of said thermally conductive material therewithin.
Claim 7
Dependent Claim
36 words
The motor of claim 1 characterized by said stator being provided with a plurality of slots which accommodate said coils therewithin, said slots further accommodating slot liners therewithin, for insulating said coils from said stator core.
Claim 8
Dependent Claim
12 words
The motor of claim 6 characterized by said slot liners being perforated.
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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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |