DE2506800

During the electric braking of an inverter powered propulsion vehicle, it is desirable that the constant torque performance characteristics be extended to a speed beyond that for which pulse width modulation can be effectively used to control voltage. This extension is accomplished by compensating t...

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Bibliographic Details
Main Author PLUNKETT, ALLAN BARR, LAWRENCE PARK, PA., US
Format Patent
LanguageEnglish
Published 26.01.1989
Edition4
Subjects
CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS
CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES
ELECTRICITY
ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL
GENERATION
MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES
PERFORMING OPERATIONS
TRANSPORTING
VEHICLES IN GENERAL
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Summary:During the electric braking of an inverter powered propulsion vehicle, it is desirable that the constant torque performance characteristics be extended to a speed beyond that for which pulse width modulation can be effectively used to control voltage. This extension is accomplished by compensating the current command signal, and thus the motor current, by an amount proportional to the speed of the vehicle and inversely proportional to the inverter d-c voltage during periods of operation above the pulse width modulated speeds. A comparator is provided to select the higher of either the uncompensated or compensated current commands, thereby allowing the current command signal to be unaffected during pulse width modulation modes and to be automatically compensated at speeds thereabove.
Bibliography:Application Number: DE19752506800