US4679313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a servo motor with high energy product magnets
Assignee: Kollmorgen Corp
•
Filing: 1985-03-08
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Granted: 1987-07-14
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Expires: 2005-03-08
Abstract
Abstract A method of making an electric motor with the stator winding inside a slotless cylindrical stator shell.
Inventors
- 👤 Roy D. Schultz
- 👤 Thomas R. England
- 👤 C. Clark Altizor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:42
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K15/00; H02K15/06; H02K15/061; H02K1/00; H02K1/02; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/278; H02K3/00; H02K3/46; H02K3/47; H02K2213/00; H02K2213/03; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A method of making an electric motor with the stator winding inside a slotless cylindrical stator shell comprising the steps of: forming a slotless cylindrical stator shell of magnetic material; creating a generally cylindrical support with a reduced diameter portion at one end; forming the winding around said support from preformed coils such that the coil and turns at one end of said support flare inwardly and extend adjacent said reduced diameter portion, and the coil end turns at the other end of said support flare outwardly; inserting said winding into said cylindrical stator shell starting with the inwardly flared end coils while the winding is supported by said support; impregnating said winding with a resin to secure said winding inside said stator shell; and removing said support from the winding through said end having said outwardly flared end coils.
Claim 2
Independent Claim
140 words
A method of making an electric motor with the stator winding inside a slotless cylindrical stator shell comprising the steps of: forming a slotless cylindrical stator shell of magnetic material; creating a generally cylindrical support with a reduced diameter portion at one end; forming the winding around said support from preformed coils such that the coil and turns at one end of said support flare inwardly and extend adjacent said reduced diameter portion, and the coil end turns at the other end of said support flare outwardly; inserting said winding into said cylindrical stator shell starting with the inwardly flared end coils while the winding is supported by said support; impregnating said winding with a resin to secure said winding inside said stator shell; and removing said support from the winding through said end having said outwardly flared end coils.
Claim 3
Dependent Claim
18 words
The method according to claim 1 wherein said winding is impregnated with resin prior to removing said support.
Claim 4
Dependent Claim
21 words
The method according to claim 2 wherein said resin has a flexural strength in excess of 2000 psi at 250° C.
Claim 5
Dependent Claim
21 words
The method according to claim 3 wherein said resin has a flexural strength in excess of 4000 psi at 250° C.
Claim 6
Dependent Claim
21 words
The method according to claim 2 wherein said resin has a thermal conductivity in excess of 6 (BTU)(in)/(hr)(ft 2 )(° F.).
Claim 7
Dependent Claim
26 words
The method according to claim 2 wherein said resin has a coefficient of thermal expansion equal to or greater than that of the cylindrical stator shell.
Claim 8
Dependent Claim
19 words
The method according to claim 2 wherein said resin has a viscosity below 50,000 cps in the uncured state.
Claim 9
Dependent Claim
19 words
The method according to claim 2 wherein said resin is an epoxy filled with a non-conductive and non-magnetic ceramic.
References Cited (Backward Citations)
US1875207A
Cited
US2749456A
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US2759116A
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US3827141A
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US3841133A
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US3892034A
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US4053800A
Cited
JPS55160957A
Cited
US4347657A
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US4492889A
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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) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |