Patent US4451775A successfully refreshed from Google Patents.
US4451775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor/generator starting circuit
Assignee: CENTURY ELECTRIC Inc A DE CORP
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Filing: 1981-08-12
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Granted: 1984-05-29
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Expires: 2001-08-12
Abstract
Abstract A circuit for use with an induction generator. The circuit is arranged to initiate operation of the induction generator as a motor to bring the system up to operating speed and subsequently to rearrange the system automatically to cause the induction generator to operate in a generating mode. The automatic reconnection is effected as an incident of the motor reaching a preselected speed. Determination of the preselected speed may be effected by voltage responsive means in one form of the invention, and by centrifugal switch in another form of the invention. The control is effected by suitably selectively connecting the phase winding of the generator. In the illustrated embodiment, a starting capacitor and a power factor correction capacitor are automatically connected at proper times in the operation.
Inventors
- 👤 Graham R. Phillips
- 👤 Norvell G. Prudot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:28
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/46; H02P2101/00; H02P2101/15; Y; Y02; Y02P; Y02P80/00; Y02P80/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
153 words
A circuit for controlling an electrodynamic machine having a main winding and a phase winding for starting the machine in a motoring mode and switching to a generating mode as an incident of the machine reaching a preselected speed, said circuit comprising: means for energizing the main winding; first capacitor means; second capacitor means having a capacitance lower than that of said first capacitor means; and control means for energizing the phase winding in a first direction of connection in series with said first capacitor means for causing said machine to operate in a motoring mode, and discontinuing energization of the phase winding in said first direction of connection and energizing the phase winding in a second direction of connection opposite to said first direction and in series with said second capacitor means as an incident of said machine reaching said preselected speed to cause said machine to operate in a generating mode.
Claim 2
Dependent Claim
153 words
A circuit for controlling an electrodynamic machine having a main winding and a phase winding for starting the machine in a motoring mode and switching to a generating mode as an incident of the machine reaching a preselected speed, said circuit comprising: means for energizing the main winding; first capacitor means; second capacitor means having a capacitance lower than that of said first capacitor means; and control means for energizing the phase winding in a first direction of connection in series with said first capacitor means for causing said machine to operate in a motoring mode, and discontinuing energization of the phase winding in said first direction of connection and energizing the phase winding in a second direction of connection opposite to said first direction and in series with said second capacitor means as an incident of said machine reaching said preselected speed to cause said machine to operate in a generating mode.
Claim 3
Dependent Claim
19 words
The circuit of claim 1 wherein said control means comprises means responsive to the voltage across said phase winding.
Claim 4
Dependent Claim
45 words
The circuit of claim 1 wherein said control means comprises a reversing relay having contacts connected in series with said phase winding and said capacitor means, and means for selectively reversing the arrangement of said reversing relay to effect said energization in said opposite direction.
Claim 5
Dependent Claim
34 words
The circuit of claim 1 wherein said second capacitor means has a capacitance providing substantially unitary power factor in the operation of the machine with said phase winding in said second direction of connection.
Claim 6
Dependent Claim
14 words
The circuit of claim 1 wherein said generator comprises a single phase induction generator.
Claim 7
Dependent Claim
49 words
The circuit of claim 1 wherein said means for energizing the main winding comprises a utility alternating current power supply having a preselected frequency, said control means causing said generator to be connected in said generating mode for delivering electrical power to said utility power supply from said machine.
Claim 8
Dependent Claim
12 words
The circuit of claim 1 wherein said control means comprises relay means.
Claim 9
Dependent Claim
13 words
The circuit of claim 1 wherein said control means comprises centrifugal switch means.
Claim 10
Dependent Claim
137 words
A circuit for controlling a single phase induction generator having a main winding and a phase winding for starting the generator in a motoring mode and switching to a generating mode as an incident of the generator reaching a preselected speed, said circuit comprising: means for energizing the main winding from a utility power supply; and control means for energizing the phase winding in a first direction of connection for causing said machine to operate in a motoring mode, and discontinuing energization of the phase winding in said first direction of connection and energizing the phase winding in a second direction of connection opposite to said first direction as an incident of said generator reaching said preselected speed to cause said machine to operate in a generation mode and provide electrical energy into said utility power supply.
Claim 11
Dependent Claim
137 words
A circuit for controlling a single phase induction generator having a main winding and a phase winding for starting the generator in a motoring mode and switching to a generating mode as an incident of the generator reaching a preselected speed, said circuit comprising: means for energizing the main winding from a utility power supply; and control means for energizing the phase winding in a first direction of connection for causing said machine to operate in a motoring mode, and discontinuing energization of the phase winding in said first direction of connection and energizing the phase winding in a second direction of connection opposite to said first direction as an incident of said generator reaching said preselected speed to cause said machine to operate in a generation mode and provide electrical energy into said utility power supply.
Claim 12
Dependent Claim
20 words
The circuit of claim 9 including means for causing the power factor of the generated current to be substantially one.
Claim 13
Dependent Claim
14 words
The circuit of claim 9 including capacitor means for use in starting motoring generation.
Claim 14
Dependent Claim
27 words
The circuit of claim 9 wherein said control means comprises a reversing relay and means responsive to the speed of the generator to actuate said reversing relay.
References Cited (Backward Citations)
US2057214A
Cited
US2011126A
Cited
US2145616A
Cited
US2981846A
Cited
US3029350A
Cited
US3809914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |