US4264846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control and braking circuit for a series connected DC machine
Assignee: Siemens AG
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Filing: 1978-12-11
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Granted: 1981-04-28
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Expires: 1998-12-11
Abstract
Abstract A continuous speed control and braking circuit for a DC propulsion motor having armature and field currents set largely independent of each other to permit operation in the field weakening region of the motor. A direct current control element is pulsed for setting the armature current; a series circuit containing the field winding and a switch is connected in parallel to the DC control element; and a field current bypass diode is shunted across the field winding.
Inventors
- 👤 Helmut Sauer
- 👤 Peter Loderer
- 👤 Lothar Roth
- 👤 Klaus Breuer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:20
CPC Classifications
B; B60; B60L; B60L7/00; B60L7/22; H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
95 words
A braking circuit for a series DC machine which is operated in the field-weakening region at least at high speed and in which the armature and field winding are connected together in a series circuit and which has a DC control element which is pulsed in braking operation and conducts at least part of the armature current, comprising a series circuit including the field winding and a switch, connected in parallel to the DC control element, and a by-pass valve connected parallel to the field winding and in the cut-off direction for the armature current.
Claim 2
Dependent Claim
95 words
A braking circuit for a series DC machine which is operated in the field-weakening region at least at high speed and in which the armature and field winding are connected together in a series circuit and which has a DC control element which is pulsed in braking operation and conducts at least part of the armature current, comprising a series circuit including the field winding and a switch, connected in parallel to the DC control element, and a by-pass valve connected parallel to the field winding and in the cut-off direction for the armature current.
Claim 3
Dependent Claim
36 words
A braking circuit in accordance with claim 1 in which the DC control element comprises a controlled main valve and a quenching device connected in parallel and in which the switch is a supplemental controlled valve.
Claim 4
Dependent Claim
41 words
A braking circuit in accordance with claim 1 in which a stabilizing resistor is connected in series to the armature winding and in which a switch is connected across the stabilizing resistor for shorting it out of the armature winding circuit.
Claim 5
Dependent Claim
29 words
A braking circuit in accordance with claim 1 in which a smoothing choke is connected between the DC control element and the armature winding of the DC series machine.
Claim 6
Dependent Claim
31 words
A braking circuit in accordance with any one of claims 1 to 4 having a return valve for connection to a DC source which can absorb current for regenerative braking operation.
Claim 7
Dependent Claim
37 words
A braking circuit in accordance with any one of claims 1 to 4 in which the series circuit comprising a braking resistor and a braking switch is shunted across the DC control element for resistance braking operation.
Claim 8
Dependent Claim
60 words
A braking circuit in accordance with any one of claims 1 to 4, having a return valve for connection to a DC source which can absorb current at least some of the time and in which DC control element is shunted by the series circuit comprising a braking resistor and a braking switch for mixed regenerative and resistance braking operation.
Claim 9
Dependent Claim
25 words
A braking circuit in accordance with any one of claims 1 to 4 having means for switching to and from a speed control circuit configuration.
Claim 10
Dependent Claim
25 words
A braking circuit in accordance with claim 8, in which the switching means includes two double pole switches operated jointly for reversing the armature winding.
Claim 11
Dependent Claim
20 words
A braking circuit in accordance with claim 9 in which the two switches comprise the contacts of a switching relay.
Claim 12
Dependent Claim
20 words
A braking circuit in accordance with claim 5 having means for switching to and from a speed control circuit configuration.
Claim 13
Dependent Claim
20 words
A braking circuit in accordance with claim 6 having means for switching to and from a speed control circuit configuration.
Claim 14
Dependent Claim
20 words
A braking circuit in accordance with claim 7 having means for switching to and from a speed control circuit configuration.
Claim 15
Dependent Claim
25 words
A braking circuit in accordance with claim 11, in which the switching means includes two double pole switches operated jointly for reversing the armature winding.
Claim 16
Dependent Claim
25 words
A braking circuit in accordance with claim 12, in which the switching means includes two double pole switches operated jointly for reversing the armature winding.
Claim 17
Dependent Claim
25 words
A braking circuit in accordance with claim 13, in which the switching means includes two double pole switches operated jointly for reversing the armature winding.
References Cited (Backward Citations)
US3651390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |