US5086245A
Expired / Lapsed
US
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Brushless DC motor slotted tooth lamination
Assignee: S1 Montevideo Tech Inc
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Filing: 1990-03-06
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Granted: 1992-02-04
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Expires: 2010-03-06
Abstract
Abstract A stator lamination allows the construction of a d.c. motor having minimum cogging torque and maximum horsepower. Each stator lamination comprises a ring of ferromagnetic material having a number of (e.g., eight) inwardly-extending integral teeth. Each tooth has a radially-inwardmost surface with side end terminations, the side end terminations of adjacent teeth being spaced from each other to define a first set of slots. A V-shaped radially-outwardly extending slot is formed in each of the radially-inwardmost surfaces between the side end terminations, to define a second set of slots (if eight teeth are provided, a total of sixteen slots are provided). The teeth have thin stems which may be wrapped with a large amount of copper wire material. The laminations are disposed in a concentric stack with each lamination skewed with respect to an adjacent lamination.
Inventors
- 👤 Alan E. Sieja
- 👤 Erland Persson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:43
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/16; H02K1/165; H02K2201/00; H02K2201/06
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
137 words
A d.c. motor stator lamination comprising: (a) a ring of ferromagnetic material having a plurality of radially inwardly extending integral teeth; (b) said teeth each having a radially inwardmost surface, with side end terminations; (c) said side end terminations of adjacent teeth inwardmost surfaces being spaced from each other to define a first set of slots having a first width; and (d) means defining a radially outwardly extending slot in each of said radially inwardmost surfaces between said side end terminations thereof, to define a second set of slots, and having initially straight sides extending generally perpendicularly to said radially inwardmost surface, said initially straight sides spaced approximately said first width, and having a V-shape portion after said initially straight sides, said V-shape portion having a radial length greater than the length of an initially straight side.
Claim 2
Dependent Claim
137 words
A d.c. motor stator lamination comprising: (a) a ring of ferromagnetic material having a plurality of radially inwardly extending integral teeth; (b) said teeth each having a radially inwardmost surface, with side end terminations; (c) said side end terminations of adjacent teeth inwardmost surfaces being spaced from each other to define a first set of slots having a first width; and (d) means defining a radially outwardly extending slot in each of said radially inwardmost surfaces between said side end terminations thereof, to define a second set of slots, and having initially straight sides extending generally perpendicularly to said radially inwardmost surface, said initially straight sides spaced approximately said first width, and having a V-shape portion after said initially straight sides, said V-shape portion having a radial length greater than the length of an initially straight side.
Claim 3
Dependent Claim
30 words
A lamination as recited in claim 1 wherein said plurality of teeth comprise eight teeth, said first and second sets of slots combining to provide a total of sixteen slots.
Claim 4
Dependent Claim
41 words
A lamination as recited in claim 2 wherein each of said teeth has a stem extending from said ring to said radially inwardmost surface, said stem having an arcuate length much less than the arcuate length of said radially inwardmost surface.
Claim 5
Dependent Claim
18 words
A lamination as recited in claim 1 wherein each of said second slots has a radially-outward narrow portion.
Claim 6
Dependent Claim
31 words
A lamination as recited in claim 4 wherein each of said second set of slots has a depth of about 0.06 inches, and wherein said first width is about 0.06 inches.
Claim 7
Dependent Claim
31 words
A lamination as recited in claim 1 wherein each of said second set of slots has a depth of about 0.06 inches, and wherein said first width is about 0.06 inches.
Claim 8
Dependent Claim
147 words
A stator for a d.c. motor, comprising: (i) a plurality of skewed laminations disposed in a concentric stack each lamination comprising: (a) a ring of ferromagnetic material having a plurality of radially inwardly extending integral teeth; (b) said teeth each having a radially inwardmost surface, with side and terminations; (c) said side and terminations of adjacent teeth inwardmost surfaces being spaced from each other to define a first set of slots having a first width; and (d) means defining a radially outwardly extending slot in each of said radially inwardmost surfaces between said side end terminations thereof, to define a second set of slots; and having initially straight sides extending generally perpendicularly to said radially inwardmost surface, and then having a V-shape after said initially straight sides, said initially straight sides spaced approximately said first width; and (ii) conductive wire wrapping around said teeth of said laminations.
Claim 9
Dependent Claim
147 words
A stator for a d.c. motor, comprising: (i) a plurality of skewed laminations disposed in a concentric stack each lamination comprising: (a) a ring of ferromagnetic material having a plurality of radially inwardly extending integral teeth; (b) said teeth each having a radially inwardmost surface, with side and terminations; (c) said side and terminations of adjacent teeth inwardmost surfaces being spaced from each other to define a first set of slots having a first width; and (d) means defining a radially outwardly extending slot in each of said radially inwardmost surfaces between said side end terminations thereof, to define a second set of slots; and having initially straight sides extending generally perpendicularly to said radially inwardmost surface, and then having a V-shape after said initially straight sides, said initially straight sides spaced approximately said first width; and (ii) conductive wire wrapping around said teeth of said laminations.
Claim 10
Dependent Claim
35 words
A stator as recited in claim 7 wherein each laminations is skewed with respect to an adjacent lamination in said stack so that each lamination has an incremental angle with respect to an adjacent lamination.
Claim 11
Dependent Claim
18 words
A stator as recited in claim 8 wherein the incremental angle between adjacent laminations is between about 0.1-2°.
Claim 12
Dependent Claim
14 words
A stator as recited in claim 9 wherein the skew angle is about 15-30°.
Claim 13
Dependent Claim
14 words
A stator as recited in claim 10 wherein the incremental angle is about 0.5°.
Claim 14
Dependent Claim
27 words
A stator as recited in claim 8 wherein said plurality of teeth comprises eight teeth, and wherein said first and second slots combine to comprise sixteen slots.
Claim 15
Dependent Claim
14 words
A stator as recited in claim 12 wherein the skew angle is about 22.5°.
Claim 16
Dependent Claim
61 words
A stator as recited in claim 7 wherein said radially outwardly extending second set of slots each comprise a V-shaped slot having a wide part defined by said initially straight sides, ad a narrow part, the narrow part being radially outward from the wide part, said narrow part having a radial length greater than the length of an initially straight side.
Claim 17
Dependent Claim
35 words
A stator for a d.c. motor as recited in claim 14 wherein each of said second sets of slots has a depth of about 0.06 inches and wherein said first width is about 0.06 inches.
Claim 18
Dependent Claim
171 words
A minimized cogging torque, and maximized horsepower, brushless d.c. motor comprising: a rotor; a shaft; a stator, said stator comprising: a plurality of skewed laminations disposed in a concentric stack, each lamination comprising a ring of ferromagnetic material having a plurality of radially inwardly extending integral teeth; said teeth each having a radially inwardmost surface, with said end terminations; said side and terminations of adjacent teeth inwardmost surfaces being spaced from each other to define a first set of slots having a first width; and means defining a radially outwardly extending slot in each of said radially inwardmost surfaces between said side end terminations thereof, to define a second set of slots and having initially straight sides extending generally perpendicularly to said radially inwardmost surface, said initially straight sides spaced approximately said first width, and then having a V-shape portion after said initially straight sides, said V-shape portion having a radial length greater than the length of an initially straight side; and conductive wire wrapping around said teeth of said laminations.
Claim 19
Dependent Claim
171 words
A minimized cogging torque, and maximized horsepower, brushless d.c. motor comprising: a rotor; a shaft; a stator, said stator comprising: a plurality of skewed laminations disposed in a concentric stack, each lamination comprising a ring of ferromagnetic material having a plurality of radially inwardly extending integral teeth; said teeth each having a radially inwardmost surface, with said end terminations; said side and terminations of adjacent teeth inwardmost surfaces being spaced from each other to define a first set of slots having a first width; and means defining a radially outwardly extending slot in each of said radially inwardmost surfaces between said side end terminations thereof, to define a second set of slots and having initially straight sides extending generally perpendicularly to said radially inwardmost surface, said initially straight sides spaced approximately said first width, and then having a V-shape portion after said initially straight sides, said V-shape portion having a radial length greater than the length of an initially straight side; and conductive wire wrapping around said teeth of said laminations.
Claim 20
Dependent Claim
37 words
A motor as recited in claim 16 wherein said plurality of teeth comprises eight teeth, and wherein said first and second slots together combine to provide sixteen slots; and wherein said rotor is a four pole rotor.
Claim 21
Dependent Claim
14 words
A motor as recited in claim 17 wherein the skew angle is about 22.5°.
Claim 22
Dependent Claim
31 words
A motor as recited in claim 16 wherein each of said second sets of slots has a depth of about 0.06 inches and wherein said first width is about 0.06 inches.
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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) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |