Patent US3728596A successfully refreshed from Google Patents.
US3728596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural motor slip-controlled driving means for traction purposes
Assignee: ABB Norden Holding AB
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Filing: 1971-03-08
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Granted: 1973-04-17
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Expires: 1991-03-08
Abstract
Abstract A slip controlled driving means for traction purposes includes a plurality of direct current motors connected to various wheel shafts. They are provided with control rectifiers forming valve control systems to control the motor current. The rectifiers respond to a first reference value supplied to the system by a first reference value transducer, a current transducer for the rotor current and a tachometer for each motor. A minimum selector is provided to compare the output values of all the tachometers and to pick out the lowest one. A reference value transducer can be set for the permissible difference between a certain motor speed and the speed of the motor rotating at the lowest speed. A summation device produces the sum of the lowest tachometer value and this difference reference, and a plurality of comparison devices are each connected to a tachometer and arranged to produce the positive difference between the output value of one tachometer and such sum. This positive difference is supplied to each of the control systems in such a way as to reduce the driving current of the motor.
Inventors
- 👤 B Hermansson
- 👤 J Gustafsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:57
CPC Classifications
B; B60; B60L; B60L3/00; B60L3/10; B60L2200/00; B60L2200/26; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
231 words
Slip-controlled drive means for traction purposes comprising a plurality of direct current motors (1), means to supply control quantities of current to said motors comprising for each motor a control system including a controlled rectifier (10,10a), a first reference-value transmitter (2,9), to supply a first reference value, a current transducer (3) for the rotor current and a tachometer (4) connected to each motor, a minimum value selector (5) connected to the outputs of the tachometers to select the lowest of their outputs, a second reference-value transmitter (6) to set a predetermined permissible difference between the speed of any motor and the speed value corresponding to the output of said minimum value selector, a summation device (7) connected to the outputs of said second reference-value transmitter and said minimum value selector to produce the sum of said lowest tachometer value and said difference, a plurality of comparison devices (8) each connected to the output of one of said tachometers and to the output of said summation device and including means to produce a positive difference between the output vaLue of each tachometer and said sum, and devices one connected between each such comparison device and the motor whose tachometer is connected thereto responsive to a value of such positive difference above a given value to supply such positive difference to the control system of such motor to reduce the rotor current thereof.
Claim 2
Dependent Claim
231 words
Slip-controlled drive means for traction purposes comprising a plurality of direct current motors (1), means to supply control quantities of current to said motors comprising for each motor a control system including a controlled rectifier (10,10a), a first reference-value transmitter (2,9), to supply a first reference value, a current transducer (3) for the rotor current and a tachometer (4) connected to each motor, a minimum value selector (5) connected to the outputs of the tachometers to select the lowest of their outputs, a second reference-value transmitter (6) to set a predetermined permissible difference between the speed of any motor and the speed value corresponding to the output of said minimum value selector, a summation device (7) connected to the outputs of said second reference-value transmitter and said minimum value selector to produce the sum of said lowest tachometer value and said difference, a plurality of comparison devices (8) each connected to the output of one of said tachometers and to the output of said summation device and including means to produce a positive difference between the output vaLue of each tachometer and said sum, and devices one connected between each such comparison device and the motor whose tachometer is connected thereto responsive to a value of such positive difference above a given value to supply such positive difference to the control system of such motor to reduce the rotor current thereof.
Claim 3
Dependent Claim
95 words
Driving means according to claim 1, which includes a maximum value selector (25) connected to the current transducers and including means to select the highest transducer value, a third reference-value transmitter (29) for the permissible difference between the greatest and smallest rotor currents, a subtracting device (27) connected to the outputs of said maximum value selector and said third reference-value transmitter, said subtracting device including means to produce the difference between said highest current transmitter value and said reference-value transmitter value, and means to supply the output of said subtracting device to said control systems.
Claim 4
Dependent Claim
14 words
Driving means according to claim 1, in which said converters (10) deliver rotor current.
Claim 5
Dependent Claim
84 words
Driving means according to claim 1, in which said converters (10) supply excitation current to the field windings of each motor, and in which said first reference-value transmitters are responsive to the field current, and further including a field current transmitter (11) and a comparison device (22) including means to compare the output value of said field current transmitters, and an amplifier connected to each converter and means to supply the output value of said comparison device to said amplifiers to control the converter.
Claim 6
Dependent Claim
222 words
Slip-controlled drive means for traction purposes comprising a plurality of direct current motors (1), means to supply control quantities of current to said motors comprising for each motor a control system including a controlled rectifier (10,10a), a first reference-value transmitter (2,9), to supply a first reference value, a current transmitter (3) for the rotor current and a tachometer (4) connected to each motor, a vehicle speed transmitter (5), a second reference-value transmitter (6) to set a predetermined permissible difference between the pre-determined motor speed of any motor and the speed value corresponding to the output of said minimum value selector, a summation device (7) connected to the outputs of said second reference-value transmitter and said vehicle speed transmitter to produce the sum of said lowest tachometer value and said vehicle speed transmitter output, a plurality of comparison devices (8) each connected to the output of one of said tachometers and to the output of said summation device and including means to produce a positive difference between the output value of each tachometer and said sum, and devices one connected between each such comparison device and the motor whose tachometer is connected thereto responsive to a value of such positive difference above a given value to supply such positive difference to the control system of such motor to reduce the rotor current thereof.
Claim 7
Dependent Claim
222 words
Slip-controlled drive means for traction purposes comprising a plurality of direct current motors (1), means to supply control quantities of current to said motors comprising for each motor a control system including a controlled rectifier (10,10a), a first reference-value transmitter (2,9), to supply a first reference value, a current transmitter (3) for the rotor current and a tachometer (4) connected to each motor, a vehicle speed transmitter (5), a second reference-value transmitter (6) to set a predetermined permissible difference between the pre-determined motor speed of any motor and the speed value corresponding to the output of said minimum value selector, a summation device (7) connected to the outputs of said second reference-value transmitter and said vehicle speed transmitter to produce the sum of said lowest tachometer value and said vehicle speed transmitter output, a plurality of comparison devices (8) each connected to the output of one of said tachometers and to the output of said summation device and including means to produce a positive difference between the output value of each tachometer and said sum, and devices one connected between each such comparison device and the motor whose tachometer is connected thereto responsive to a value of such positive difference above a given value to supply such positive difference to the control system of such motor to reduce the rotor current thereof.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |