US3735217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Twin motor drive system
Assignee: Westinghouse Electric Corp
•
Filing: 1971-11-01
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Granted: 1973-05-22
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Expires: 1991-11-01
Abstract
Abstract A twin motor drive system having two synchronous motors of usual construction driving a common load. Means are provided for controlling the field excitation of the motors in a manner to maintain equal division of the load.
Inventors
- 👤 L Kilgore
- 👤 B Strait
- 👤 E Whitney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:25
CPC Classifications
H; H02; H02P; H02P5/00; H02P5/74; H02P5/747; H02P5/753
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
101 words
In combination, two synchronous motors, each of said motors having an armature winding adapted to be supplied with alternating current and having a field winding, means for supplying direct current excitation to said field windings, means for individually controlling the excitation of each field winding, means for mechanically connecting said motors to drive a common load, and means responsive to the power inputs to said motors for continuously adjusting said field excitation controlling means to relatively reduce the field excitation of the motor with the higher power input and increase the field excitation of the motor with the lower power input.
Claim 2
Dependent Claim
101 words
In combination, two synchronous motors, each of said motors having an armature winding adapted to be supplied with alternating current and having a field winding, means for supplying direct current excitation to said field windings, means for individually controlling the excitation of each field winding, means for mechanically connecting said motors to drive a common load, and means responsive to the power inputs to said motors for continuously adjusting said field excitation controlling means to relatively reduce the field excitation of the motor with the higher power input and increase the field excitation of the motor with the lower power input.
Claim 3
Dependent Claim
13 words
The combination of claim 1 in which the two motors are substantially identical.
Claim 4
Dependent Claim
93 words
In combination, two synchronous motors, means for mechanically connecting said motors to drive a common load, each of said motors having an armature winding and a field winding, means for supplying direct current field excitation to said field windings, means for sensing the power inputs to each of said motors, and means controlled by said sensing means for continuously adjusting the excitation of said field windings to reduce the field excitation of the motor having the higher power input and to increase the field excitation of the motor having the lower power input.
Claim 5
Dependent Claim
93 words
In combination, two synchronous motors, means for mechanically connecting said motors to drive a common load, each of said motors having an armature winding and a field winding, means for supplying direct current field excitation to said field windings, means for sensing the power inputs to each of said motors, and means controlled by said sensing means for continuously adjusting the excitation of said field windings to reduce the field excitation of the motor having the higher power input and to increase the field excitation of the motor having the lower power input.
Claim 6
Dependent Claim
13 words
The combination of claim 3 in which the two motors are substantially identical.
Claim 7
Dependent Claim
44 words
The combination of claim 4 in which said sensing means continuously senses and compares the power inputs to each of the motors, and including means for individually controlling the excitation of said field windings in response to signals from said sensing and comparing means.
References Cited (Backward Citations)
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Cited
US2429427A
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US2459253A
Cited
US3351830A
Cited
US3434025A
Cited
US3549965A
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |