US3766416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internally insulated, metal enclosed electric motor
Assignee: Ebm Papst St Georgen GmbH and Co KG
•
Filing: 1972-05-15
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Granted: 1973-10-16
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Expires: 1992-05-15
Abstract
Abstract A layer of insulating material, preferably a tube of insulating material extends around the outside of the stator laminations, completely surrounding the stator laminations from end face to end face; pre-formed insulating end caps, in the form of hollowed rings cover the end loops of the windings extending beyond the stator to form, together with the insulating sleeve, a continuous insulating covering layer. The electromagnetically active elements of the rotor are insulated from the rotor shaft by means of a sleeve which can extend, beyond the end faces of the rotor, in a conical flare to provide completely insulated end faces. The outer insulating sleeves can be covered with metal enclosures.
Inventors
- 👤 H Papst
- 👤 G Papst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:23
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/18; H02K1/185; H02K1/22; H02K1/28; H02K1/30; H02K15/00; H02K15/16; H02K3/00; H02K3/32
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
131 words
Internally insulated electric motor having a stator stack formed of magnetic laminations, and windings therein, a housing, and a rotor; wherein a layer (23, 72, 73, 77'', 177) of insulating material extends around the outside of the stator laminations, completely surrounding said stator laminations throughout their lengths from end face to end face of the stator at the outside thereof; and metal attachment means (78) are provided, located at the outside of the layer to secure the layer around the stator laminations, wherein the metal attachment means comprises a metal tube (82'') located concentrically over the layer (77) of insulating material and placed over the stator laminations (70), said tube having an axially extending outwardly directed bulge (83) which is compressed to secure the tube over the layer of insulating material.
Claim 2
Dependent Claim
131 words
Internally insulated electric motor having a stator stack formed of magnetic laminations, and windings therein, a housing, and a rotor; wherein a layer (23, 72, 73, 77'', 177) of insulating material extends around the outside of the stator laminations, completely surrounding said stator laminations throughout their lengths from end face to end face of the stator at the outside thereof; and metal attachment means (78) are provided, located at the outside of the layer to secure the layer around the stator laminations, wherein the metal attachment means comprises a metal tube (82'') located concentrically over the layer (77) of insulating material and placed over the stator laminations (70), said tube having an axially extending outwardly directed bulge (83) which is compressed to secure the tube over the layer of insulating material.
Claim 3
Dependent Claim
73 words
Motor according to claim 19, wherein pre-formed insulating end caps (73) are provided covering the end loops of the windings in the stator and forming, together with the insulating material, a continuous insulating covering layer, the end caps being formed with cylindrical extensions (73'', 73''''), covering the outside of the stator laminations and extending from opposite end caps towards each other to form, together, an insulating sleeve of said layer of insulating material.
Claim 4
Dependent Claim
16 words
Motor according to claim 2, wherein the terminal ends of the cylindrical extensions overlap each other.
Claim 5
Dependent Claim
126 words
Internally insulated electric motor having a stator stack formed of magnetic laminations, and windings therein, a housing, and a rotor; wherein a layer (23, 72, 73, 77'', 177) of insulating material extends around the outside of the stator laminations, completely surrounding said stator laminations throughout their lengths from end face to end face of the stator at the outside thereof; and metal attachment means (78) are provided, located at the outside of the layer to secure the layer around the stator laminations, wherein the metal attachment means comprises a rolled sheet metal cover (182) surrounding the outside of the insulating layer (77) over the stator laminations (70); and an overlapping axially extending cover strip (85) covering the junction between the ends of the sheet metal cover.
Claim 6
Dependent Claim
126 words
Internally insulated electric motor having a stator stack formed of magnetic laminations, and windings therein, a housing, and a rotor; wherein a layer (23, 72, 73, 77'', 177) of insulating material extends around the outside of the stator laminations, completely surrounding said stator laminations throughout their lengths from end face to end face of the stator at the outside thereof; and metal attachment means (78) are provided, located at the outside of the layer to secure the layer around the stator laminations, wherein the metal attachment means comprises a rolled sheet metal cover (182) surrounding the outside of the insulating layer (77) over the stator laminations (70); and an overlapping axially extending cover strip (85) covering the junction between the ends of the sheet metal cover.
Claim 7
Dependent Claim
19 words
Motor according to claim 4, wherein the cover strip is secured to the rolled sheet metal cover by welding.
Claim 8
Dependent Claim
51 words
Motor according to claim 4, wherein the layer of insulating material is a rolled foil having overlapping ends (84), the ends being located at a region free from the rolled sheet metal cover, the cover strip covering the gap between the rolled metal cover and the overlapped ends of the foil.
Claim 9
Dependent Claim
35 words
Motor according to claim 1, wherein the rotor is a squirrel cage rotor, and ring-shaped caps (102) of insulating material and formed with ventilating means are located at the end face portions of the rotor.
Claim 10
Dependent Claim
73 words
Motor according to claim 4, wherein preformed insulating end caps (73) are provided covering the end loops of the windings in the stator and forming, together with the insulating material, a continuous insulating covering layer, the end caps being formed with cylindrical extensions (73'', 73''''), covering the outside of the stator laminations and extending from opposite end caps towards each other to form, together, an insulating sleeve of said layer of insulating material.
Claim 11
Dependent Claim
16 words
Motor according to claim 8, wherein the terminal ends of the cylindrical extensions overlap each other.
Claim 12
Dependent Claim
35 words
Motor according to claim 4, wherein the rotor is a squirrel cage rotor, and ring-shaped caps (102) of insulating material and formed with ventilating means are located at the end face portions of the rotor.
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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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |