US3753059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simplified battery powered regenerative drive system
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1972-04-03
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Granted: 1973-08-14
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Expires: 1992-04-03
Abstract
Abstract A battery powered regenerative drive system having a time ratio controlled regenerative chopper circuit for regulating electrical power flow between the drive system battery and traction motor in both the drive and regenerative modes of the drive system, and a novel and simplified mode switching arrangement utilizing only two switches, which may be either unidirectional solid state switches or contacts of a single pole double throw relay, for switching the drive system between its drive and regenerative modes.
Inventors
- 👤 B Berman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:26
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/298; H02P3/00; H02P3/06; H02P3/08; H02P3/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
244 words
A battery powered regenerative drive system operable in a drive mode and a regenerative mode, comprising: a battery; a direct current torquer having an armature and a field and operable as a motor in said drive mode and a generator in said regenerative mode; a power control circuit connecting said battery and torquer for transmitting energy from said battery to said torquer to produce an electromagnetic driving torque on said armature in said drive mode, and transmitting energy from said torquer to said battery to charge said battery and produce an electromagnetic braking torque on said armature in said regenerative mode; and said control circuit including first, second and third circuit legs connected in electrical parallel and having first electrically connected ends and second electrically connected ends, and a fourth circuit legs terminally connected to said second leg at first and second junctions adjacent said first and second leg ends, respectively, and a fifth circuit leg terminally connected to said third and fourth legs between the ends thereof, said battery being serially connected in said first leg with its positive and negative terminals adjacent said first and second leg ends, respectively, said armature being serially connected in said second leg between its first and second junctions with said fourth leg, said field being serialLy connected in said fifth leg, a drive mode switch serially connected in said second leg between its first end and its first junction with said fourth leg, a diode serially
Claim 2
Dependent Claim
244 words
A battery powered regenerative drive system operable in a drive mode and a regenerative mode, comprising: a battery; a direct current torquer having an armature and a field and operable as a motor in said drive mode and a generator in said regenerative mode; a power control circuit connecting said battery and torquer for transmitting energy from said battery to said torquer to produce an electromagnetic driving torque on said armature in said drive mode, and transmitting energy from said torquer to said battery to charge said battery and produce an electromagnetic braking torque on said armature in said regenerative mode; and said control circuit including first, second and third circuit legs connected in electrical parallel and having first electrically connected ends and second electrically connected ends, and a fourth circuit legs terminally connected to said second leg at first and second junctions adjacent said first and second leg ends, respectively, and a fifth circuit leg terminally connected to said third and fourth legs between the ends thereof, said battery being serially connected in said first leg with its positive and negative terminals adjacent said first and second leg ends, respectively, said armature being serially connected in said second leg between its first and second junctions with said fourth leg, said field being serialLy connected in said fifth leg, a drive mode switch serially connected in said second leg between its first end and its first junction with said fourth leg, a diode serially
Claim 3
Dependent Claim
208 words
A drive system according to claim 1 wherein: connected in said second leg between its second end and its second junction with said fourth leg for conducting current toward said second junction, a diode serially connected in said third leg between its first end and its junction with said fifth leg for conducting current toward the latter leg end, a power switch serially connected in said third leg between its second end and its junction with said fifth leg, a regenerative mode switch serially connected in said fourth leg between its first junction with said second leg and its junction with said fifth leg, a diode serially connected in said fourth leg between its second junction with said second leg and its junction with said fifth leg for conducting current toward said latter junction, means for actuating said regenerative and drive mode switches to conducting and blocking states, respectively, to condition said drive system for operation in the regenerative mode, and to blocking and conducting states, respectively, to condition said drive system for operation in the drive mode, and means for periodically actuating said power switch between blocking and conducting states alternately for a variable time period. said mode switches are contacts of a mode control relay means.
Claim 4
Dependent Claim
18 words
A drive system according to claim 2 wherein: said relay means comprises one single pole double throw relay.
Claim 5
Dependent Claim
15 words
A drive system according to claim 1 wherein: said mode switches are solid state swtiches.
Claim 6
Dependent Claim
16 words
A drive system according to claim 4 wherein: said solid state switches are silicon controlled rectifiers.
Claim 7
Dependent Claim
118 words
A drive system according to claim 1 wherein: said switch actuating means comprise a manual control such as a throttle pedal movable between braking and driving positions through an intermediate mode transfer position, means actuated by said manual control for placing said mode switches in their regenerative mode states in response to movement of the manual control through mode transfer position into the braking range and in their drive mode states in response to movement of the manual control through mode transfer position into the driving range, and a time ratio controlled circuit controlled by said manual control for regulating the duty cycle of said power switch in response to movement of said manual control through said ranges.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |