US3577002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor-generator combination
Assignee: Plessey Overseas Ltd
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Filing: 1969-04-16
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Granted: 1971-05-04
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Expires: 1989-04-16
Abstract
Abstract A compact unit for supplying an aircraft with both DC and AC electric power under normal running conditions and to provide also electric starting facilities, and which can be attached to a single engine pad of an aircraft turbine, is obtained by energizing the rotor field windings of an alternator with DC power via a rectifier system participating in its rotation from the armature windings of a coaxially arranged starter motor, which for the purpose has a second multiturn field winding, the starter motor having also automatic brush-lifting gear; the DC power output is obtained from a second stator winding of the alternator via a built-in rectifier set.
Inventors
- 👤 Samuel S Hall
- 👤 Robert A Miller
- 👤 Philip R H Riley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:16
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/16; H02K19/34; H02K11/00; H02K11/04; H02K11/042; H02K7/00; H02K7/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
139 words
An electric machine adapted to be driven by DC to produce torque for starting a combustion engine and, when driven by such engine, to produce an AC electric output, the machine comprising an electrical alternator having a stator, equipped with an alternator-output winding, and a rotor, equipped with an alternator-field winding, an electric motor-generator having a stator, equipped with a motor-field winding and with a generatorfield winding, and an armature which is connected to the rotor of said alternator for joint rotation therewith, said armature having a heavy-current commutation system, including a commutator and brushes in series with said motor-field winding for the production of torque to start each engine, and having a second commutation system constituted by a rectifier set participating in the rotation of the armature and feeding DC generated by it direct to the alternator-field winding.
Claim 2
Dependent Claim
139 words
An electric machine adapted to be driven by DC to produce torque for starting a combustion engine and, when driven by such engine, to produce an AC electric output, the machine comprising an electrical alternator having a stator, equipped with an alternator-output winding, and a rotor, equipped with an alternator-field winding, an electric motor-generator having a stator, equipped with a motor-field winding and with a generatorfield winding, and an armature which is connected to the rotor of said alternator for joint rotation therewith, said armature having a heavy-current commutation system, including a commutator and brushes in series with said motor-field winding for the production of torque to start each engine, and having a second commutation system constituted by a rectifier set participating in the rotation of the armature and feeding DC generated by it direct to the alternator-field winding.
Claim 3
Dependent Claim
34 words
A machine as claimed in claim 1, wherein the alternator is provided with two outlets, one to an AC network, and a second outlet via an output-rectification diode system to an external DC load.
Claim 4
Dependent Claim
19 words
A machine as claimed in claim 2, wherein the output-rectification system is accommodated in the stator of the alternator.
Claim 5
Dependent Claim
30 words
A machine as claimed in claim 3, wherein the alternator is provided with two stator windings so as to supply different voltages to the AC outlet and the output-rectification system.
Claim 6
Dependent Claim
27 words
A machine as claimed in claim 1, which includes an automatic brush-lifting mechanism which lifts the brushes of the commutator when a starting operation has been completed.
Claim 7
Dependent Claim
19 words
A machine as claimed in claim 1, wherein said rectifier system is accommodated in the rotor of the alternator.
Claim 8
Dependent Claim
32 words
An electric machine as claimed in claim 1, wherein said generator-field winding is connected to shunt said second commutation system so as to be energized by DC generated by the motor generator.
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |