Patent US3577055A successfully refreshed from Google Patents.
US3577055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for regenerative braking of an impulse-controlled direct current series motor
Assignee: ABB Norden Holding AB
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Filing: 1968-06-03
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Granted: 1971-05-04
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Expires: 1988-06-03
Abstract
Abstract An arrangement for regenerative braking of a thyristorcontrolled DC series motor used as driving motor for street cars. During braking possible excess energy is consumed by a resistor connected in parallel with the motor. The resistor is connected in series with a switching means for connecting and disconnecting the resistor at an upper and lower voltage level, respectively.
Inventors
- 👤 Fredrik Hermansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:26
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P3/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
An arrangement for regenerative braking of an impulsecontrolled direct current series motor, said motor being reversible between a speed connection and a braking connection, said motor in said braking connection being connected in parallel with a thyristor and connected to a direct current network through a diode, a capacitor connected in parallel across the series-connection of said motor and said diode, a seriesconnection of a resistor and a switching means connected in parallel with said capacitor, said switching means comprising a second thyristor provided with firing and extinguishing means, control means for said switching means, said control means comprising a level detector and a time delay circuit, said level detector including means responsive to the voltage across said capacitor, when said voltage is at an upper level, to generate a signal to effect firing of said second thyristor and, after a certain time interval determined by said time delay circuit, to extinguish said second thyristor.
Claim 2
Dependent Claim
155 words
An arrangement for regenerative braking of an impulsecontrolled direct current series motor, said motor being reversible between a speed connection and a braking connection, said motor in said braking connection being connected in parallel with a thyristor and connected to a direct current network through a diode, a capacitor connected in parallel across the series-connection of said motor and said diode, a seriesconnection of a resistor and a switching means connected in parallel with said capacitor, said switching means comprising a second thyristor provided with firing and extinguishing means, control means for said switching means, said control means comprising a level detector and a time delay circuit, said level detector including means responsive to the voltage across said capacitor, when said voltage is at an upper level, to generate a signal to effect firing of said second thyristor and, after a certain time interval determined by said time delay circuit, to extinguish said second thyristor.
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 |