Patent US4117388A successfully refreshed from Google Patents.
US4117388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternating current generator
Assignee: ENERGX Corp
•
Filing: 1977-01-07
•
Granted: 1978-09-26
•
Expires: 1997-01-07
Abstract
Abstract A dynamo electric machine including an alternating current generator and a brushless exciter for the generator field, wherein control and compounding field windings of the exciter are energized from the generator stator winding through stationary rectifier circuits, the rectifier circuit for the compounding field making connection with the generator stator winding in the vicinity of its neutral point to avoid impressing high voltage to ground on rectifiers of the circuit.
Inventors
- 👤 Lawrence R. Roche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:39
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/36; H02K; H02K19/00; H02K19/16; H02K19/26; H02K19/30; H02P9/38
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
133 words
A brushless dynamo electric machine comprising: a generator with a stator winding including a neutral connection at an intermediate point thereof and a rotor field winding; an exciter including a rotor winding and cooperating control field and compound field windings; first circuit means including first rectifier means connected to energize said control field winding of the exciter in relation to the voltage of said generator stator winding; second circuit means including second rectifier means connected to said generator stator winding in close proximity to said neutral connection thereof for energizing said compounding field winding of the exciter in proportion to the amplitude of current in said generator stator winding, and rotary rectifier means connected to energize said rotor field winding with a D.C. voltage related to the A.C. voltage of said rotor winding.
Claim 2
Dependent Claim
133 words
A brushless dynamo electric machine comprising: a generator with a stator winding including a neutral connection at an intermediate point thereof and a rotor field winding; an exciter including a rotor winding and cooperating control field and compound field windings; first circuit means including first rectifier means connected to energize said control field winding of the exciter in relation to the voltage of said generator stator winding; second circuit means including second rectifier means connected to said generator stator winding in close proximity to said neutral connection thereof for energizing said compounding field winding of the exciter in proportion to the amplitude of current in said generator stator winding, and rotary rectifier means connected to energize said rotor field winding with a D.C. voltage related to the A.C. voltage of said rotor winding.
Claim 3
Dependent Claim
18 words
A brushless dynamo electric machine as recited in claim 1 wherein said neutral connection is connected to ground.
Claim 4
Dependent Claim
20 words
A brushless dynamo electric machine as recited in claim 1 wherein said stator winding of said generator is polyphase winding.
Claim 5
Dependent Claim
22 words
A brushless dynamo electric machine as recited in claim 3 wherein said polyphase stator winding of said generator is a three-phase winding.
Claim 6
Dependent Claim
29 words
A dynamo electric machine as recited in claim 4 wherein said second circuit means comprises a three-phase rectifier circuit connected in the neutral connection of said three-phase stator winding.
Claim 7
Dependent Claim
18 words
A dynamo electric machine as recited in claim 4 wherein said second circuit means is connected to ground.
Claim 8
Dependent Claim
21 words
A dynamo electric machine as recited in claim 4 wherein a rectifier in said second circuit means is connected to ground.
Claim 9
Dependent Claim
20 words
A dynamo electric machine as recited in claim 5 wherein a ground connection is made to said compounding field winding.
Claim 10
Dependent Claim
18 words
A dynamo electric machine as recited in claim 4 wherein said compounding winding is a single phase winding.
Claim 11
Dependent Claim
31 words
A dynamo electric machine as recited in claim 4 wherein a ground connection is made to a point on a circuit including said second circuit means and said exciter compounding winding.
Claim 12
Dependent Claim
33 words
A dynamo electric machine as recited in claim 4 wherein said first rectifier means includes a connection across a portion of a phase winding of said stator winding at the neutral end thereof.
Claim 13
Dependent Claim
18 words
A dynamo electric machine as recited in claim 4 wherein said first circuit means includes a voltage regulator.
Claim 14
Dependent Claim
139 words
A brushless dynamo electric machine comprising: a synchronous generator comprising a three-phase stator winding including a neutral connection between phases thereof and a single phase rotor field winding; a brushless exciter including a rotor winding and cooperating stator control field and compounding field windings; rotary rectifier means connected to energize said rotor field winding of the generator with a D.C. voltage derived from an A.C. current in said exciter rotor winding; first circuit means including a first rectifier means connected to energize said control field winding to excite said exciter rotor winding for no load voltage regulation of said generator; second circuit means including second rectifier means connected in series in said neutral connection between phases of said generator stator winding for energizing said compounding field winding in proportion to the amplitude of current in said generator stator winding.
Claim 15
Dependent Claim
139 words
A brushless dynamo electric machine comprising: a synchronous generator comprising a three-phase stator winding including a neutral connection between phases thereof and a single phase rotor field winding; a brushless exciter including a rotor winding and cooperating stator control field and compounding field windings; rotary rectifier means connected to energize said rotor field winding of the generator with a D.C. voltage derived from an A.C. current in said exciter rotor winding; first circuit means including a first rectifier means connected to energize said control field winding to excite said exciter rotor winding for no load voltage regulation of said generator; second circuit means including second rectifier means connected in series in said neutral connection between phases of said generator stator winding for energizing said compounding field winding in proportion to the amplitude of current in said generator stator winding.
Claim 16
Dependent Claim
32 words
A dynamo electric machine as recited in claim 11 wherein means is included to connect a point in a circuit including said compounding field winding and said second circuit means to ground.
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) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |