US3733506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Commutated wound armature assemblies
Assignee: Singer Co
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Filing: 1971-10-29
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Granted: 1973-05-15
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Expires: 1991-10-29
Abstract
Abstract Winding configurations for the armature of small commutator type motors are disclosed in which a first winding can be identified as just completing commutation at one brush at the same time that a second winding is in the midst of being short circuited by the other brush. The windings are distributed and arranged to be closely coupled to each other by having coil sides of each winding in slots common to both. In this manner, the abrupt current change required by the commutation process can be compensated for by an opposite change in current in the coupled short-circuited winding and with a minimum instantaneous flux change. This results in significantly reduced sparking, longer brush and commutator life and reduced electromagnetic interference (EMI).
Inventors
- 👤 W Jaffe
- 👤 J Wurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:29
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/26; H02K23/36; H02K3/00; H02K3/04; H02K3/12; H02K3/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
A rotor assembly for an electric motor having brushes comprising: an armature mounted for rotation about its axis, said armature having a plurality of slots equally spaced about its periphery, a commutator ring mounted to turn with said armature with its axis coinciding with said armature axis and divided into a plurality of bars of equal arcuate length and insulated from each other for successive engagement with the brushes of the motor, a plurality of coils wound in said slots, said coils being connected to define a first distributed winding between a first pair of adjacent commutator bars and a second distributed winding between a second pair of adjacent commutator bars, certain of the coil sides of said first winding lying in the same slots as the coil sides of said second winding to form mutual coupling between said windings whereby when one winding is under commutation and/or just completing commutation at one brush, the other winding is short-circuited through the other brush.
Claim 2
Dependent Claim
163 words
A rotor assembly for an electric motor having brushes comprising: an armature mounted for rotation about its axis, said armature having a plurality of slots equally spaced about its periphery, a commutator ring mounted to turn with said armature with its axis coinciding with said armature axis and divided into a plurality of bars of equal arcuate length and insulated from each other for successive engagement with the brushes of the motor, a plurality of coils wound in said slots, said coils being connected to define a first distributed winding between a first pair of adjacent commutator bars and a second distributed winding between a second pair of adjacent commutator bars, certain of the coil sides of said first winding lying in the same slots as the coil sides of said second winding to form mutual coupling between said windings whereby when one winding is under commutation and/or just completing commutation at one brush, the other winding is short-circuited through the other brush.
Claim 3
Dependent Claim
32 words
A rotor assembly according to claim 1 in which each winding consists of forwardly and backwardly wound coils and the extreme coil sides of each winding span approximately the full armature periphery.
Claim 4
Dependent Claim
24 words
A rotor assembly according to claim 2 in which one or more coil sides of each winding lie in slots common to both windings.
Claim 5
Dependent Claim
32 words
A rotor assembly according to claim 1 in which each winding is progressively distributed in the same direction and the Extreme coil sides of each winding span approximately one-half the armature periphery.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |