A step-down chopper is to be used to supply power from a 600-V overhead wire to the commutator motor on a trolley bus. The motor may be mod- eled as a generated direct voltage in series with a resistance of 0.2 and an inductance of 25 mH. The frequency of the chopper is set at 500 Hz. (a) When the bus is stopped, what should be the ON time of the chopper to provide a motor current of 150 A? (b) What is the maximum possible generated voltage of the motor for which a current of 150 A can be supplied? (c) What is the average value of the supply current for the conditions of (a) and (b)? (d) If the motor current is to be continuous, what should be its minimum value?
A step-down chopper is to be used to supply power from a 600-V overhead wire to the commutator motor on a trolley bus. The motor may be mod- eled as a generated direct voltage in series with a resistance of 0.2 and an inductance of 25 mH. The frequency of the chopper is set at 500 Hz. (a) When the bus is stopped, what should be the ON time of the chopper to provide a motor current of 150 A? (b) What is the maximum possible generated voltage of the motor for which a current of 150 A can be supplied? (c) What is the average value of the supply current for the conditions of (a) and (b)? (d) If the motor current is to be continuous, what should be its minimum value?
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter12: Power System Controls
Section: Chapter Questions
Problem 12.4P
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VIEWStep 2: (a) ON time of the chopper to provide a motor current of 150 A
VIEWStep 3: (b) Maximum possible generated voltage of the motor for which a current of 150 A can be supplied
VIEWStep 4: (c) Average value of the supply current for the conditions of (a) and (b)
VIEWStep 5: (d) Minimum value of motor current for continuous operation
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