US3689812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Generator-fed motor control with dynamic braking for vehicle propulsion
Assignee: Siemens AG
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Filing: 1971-02-11
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Granted: 1972-09-05
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Expires: 1991-02-11
Abstract
Abstract In a variable voltage drive of the Ward Leonard type the excitation of the generator is discontinued for braking and the armature of the generator and the armature of the drive motor are connected to a brake resistor. As a result, a braking effect occurs without delay and the voltage of the generator decays quickly to a value which is required for the connection to the excitation winding of the drive motor.
Inventors
- 👤 Max Eisele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:10
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P3/12; B; B60; B60L; B60L50/00; B60L50/10; B60L7/00; B60L7/02; B60L7/04; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70; Y02T10/7072
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
155 words
A variable voltage drive for vehicle propulsion or the like, comprising a DC generator having an armature and an excitation circuit, at least one drive motor having an armature connected in series with said generator armature, brake circuit means and a switching device for selectively connecting said brake circuit for braking operation, said switching device comprising a plurality of switching components connected across said motor armature and in said excitation circuit of said generator, said generator excitation circuit being opened during transition from operation to braking to discontinue the excitation of the generator and simultaneously to switch the armature of the drive motor to the brake circuit and maintain the connection of the generator to the drive motor, and excitation circuit of the generator being reclosed by said device to continue the excitation of the generator at a reduced level upon the voltage for energizing the winding of the drive motor attaining a predetermined magnitude.
Claim 2
Dependent Claim
155 words
A variable voltage drive for vehicle propulsion or the like, comprising a DC generator having an armature and an excitation circuit, at least one drive motor having an armature connected in series with said generator armature, brake circuit means and a switching device for selectively connecting said brake circuit for braking operation, said switching device comprising a plurality of switching components connected across said motor armature and in said excitation circuit of said generator, said generator excitation circuit being opened during transition from operation to braking to discontinue the excitation of the generator and simultaneously to switch the armature of the drive motor to the brake circuit and maintain the connection of the generator to the drive motor, and excitation circuit of the generator being reclosed by said device to continue the excitation of the generator at a reduced level upon the voltage for energizing the winding of the drive motor attaining a predetermined magnitude.
Claim 3
Dependent Claim
211 words
An electric drive for vehicles in which an AC generator having an excitation circuit energizes at least one drive motor via a plurality of electronic switches having a winding and an armature which may be switched by a switching device to a brake resistor or the like during switching operation and control means for controlling the conductivity condition of one of the electronic switches, said switching device comprising a plurality of switching components connected between the armature and the winding of the drive motor, in the excitation circuit of the generator, between the one of the electronic switches and the control means and between the armature of the generator and the brake resistor in a manner whereby in a transition form operation to braking the control means is disconnected from the one of the electronic switches the excitation circuit of the generator is opened to discontinue the excitation of the generator and simultaneously to switch the armature of the drive motor to the brake resistor and maintain the connection of the generator to the drive motor, and the excitation circuit of the generator is closed to continue the excitation of the generator at a reduced level upon the voltage for energizing the winding of the drive motor attaining a predetermined magnitude.
Claim 4
Dependent Claim
211 words
An electric drive for vehicles in which an AC generator having an excitation circuit energizes at least one drive motor via a plurality of electronic switches having a winding and an armature which may be switched by a switching device to a brake resistor or the like during switching operation and control means for controlling the conductivity condition of one of the electronic switches, said switching device comprising a plurality of switching components connected between the armature and the winding of the drive motor, in the excitation circuit of the generator, between the one of the electronic switches and the control means and between the armature of the generator and the brake resistor in a manner whereby in a transition form operation to braking the control means is disconnected from the one of the electronic switches the excitation circuit of the generator is opened to discontinue the excitation of the generator and simultaneously to switch the armature of the drive motor to the brake resistor and maintain the connection of the generator to the drive motor, and the excitation circuit of the generator is closed to continue the excitation of the generator at a reduced level upon the voltage for energizing the winding of the drive motor attaining a predetermined magnitude.
Claim 5
Dependent Claim
57 words
An electric drive for vehicles as claimed in claim 1, wherein the switching component of the switching device connected between the armature and the winding of the drive motor separates said winding from said armature and connects said winding to the generator when the voltage for energizing the winding of the drive motor attains said predetermined magnitude.
References Cited (Backward Citations)
US2420873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |