US3911303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper commutator-aluminum winding armature
Assignee: International Business Machines Corp
•
Filing: 1971-08-19
•
Granted: 1975-10-07
•
Expires: 1991-08-19
Abstract
Abstract A high-torque low-inertia armature for use with an electric motor wherein the armature winding is formed of aluminum conductors, and wherein a copper commutation band is formed on selected aluminum conductors in a manner to mechanically lock each commutator segment to its aluminum conductor, the locking structure being constructed and arranged to continue to function as the motor brush wears away to the top surface of the aluminum conductor.
Inventors
- 👤 Paul Y Hu
- 👤 Kenneth N Karol
- 👤 Gary A Puzo
- 👤 Bradford C Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:37
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/32; H02; H02K; H02K13/00; H02K13/04; H02K13/08; H02K3/00; H02K3/04; H02K3/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
AN ARMATURE FOR USE IN A HIGH-TORQUE, LOW-INERTIA MOTOR HAVING BRUSHES WHICH DIRECTLY ENGAGE THE ARMATURE WINDING ALUMINUM CONDUCTORS TO FORM A COMMUTATION INTERFACE, SAID COMMUTATION INTERFACE COMPRISING: COMMUTATOR SEGMENTS SPANNING A LENGTH OF THE ALUMINUM CONDUCTORS WHICH IS GREATER THAN THE LENGTH OF SAID COMMUTATION INTERFACE TO THEREBY INSURE A LOCKING OVERLAP OF THE ALUMIMUM CONDUCTORS WHEN SAID COMMUTATOR SEGMENTS WEAR TO EXPOSE THE UNDERLYING ALUMINUM CONDUCTORS TO THE BRUSHES.
Claim 2
Dependent Claim
71 words
AN ARMATURE FOR USE IN A HIGH-TORQUE, LOW-INERTIA MOTOR HAVING BRUSHES WHICH DIRECTLY ENGAGE THE ARMATURE WINDING ALUMINUM CONDUCTORS TO FORM A COMMUTATION INTERFACE, SAID COMMUTATION INTERFACE COMPRISING: COMMUTATOR SEGMENTS SPANNING A LENGTH OF THE ALUMINUM CONDUCTORS WHICH IS GREATER THAN THE LENGTH OF SAID COMMUTATION INTERFACE TO THEREBY INSURE A LOCKING OVERLAP OF THE ALUMIMUM CONDUCTORS WHEN SAID COMMUTATOR SEGMENTS WEAR TO EXPOSE THE UNDERLYING ALUMINUM CONDUCTORS TO THE BRUSHES.
Claim 3
Dependent Claim
31 words
An armature as defined in claim 1 wherein the cross-sectional shape of said commutator segments is convex to thereby initially increase the commutation metal commutation area as the commutator segments wear.
Claim 4
Dependent Claim
30 words
An armature as defined in claim 2 wherein said commutator segments span an axial length of the aluminum conductors which is greater than the axial length of said commutation interface.
Claim 5
Dependent Claim
16 words
An armature as defined in claim 3 wherein said commutator segments are generally convex in cross-section.
Claim 6
Dependent Claim
13 words
An armature as defined in claim 4 wherein said commutation metal is copper.
Claim 7
Dependent Claim
29 words
An armature as defined in claim 5 wherein said commutatoR segments span an axial length of the conductors which is greater than the axial length of said brush interface.
Claim 8
Dependent Claim
16 words
An armature as defined in claim 6 wherein said commutator segments are generally convex in cross-section.
Claim 9
Dependent Claim
13 words
An armature as defined in claim 7 wherein said commutation metal is copper.
References Cited (Backward Citations)
US499350A
Cited
US1922317A
Cited
US2037457A
Cited
US2436910A
Cited
US2696570A
Cited
US3488539A
Cited
US3490672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |