A 4-quadrant DC chopper with bipolar switching operating at a switching frequency of 2kHz, is connected to a 120VDC source (Vs) and a DC motor which has a counter EMF (CEMF) of 50VDC at rated speed. The armature resistance is 2Ω and the armature inductance is 20mH. Calculate: a) Output voltage with an 80% duty cycle b) Magnitude and direction of the DC armature current with an 80% duty cycle. c) Duty cycle for a forward braking current of 10ADC. (Assume the speed has not changed due to the large inertia of the load.)

A 4-quadrant DC chopper with bipolar switching operating at a switching frequency of 2kHz, is connected to a 120VDC source (Vs) and a DC motor which has a counter EMF (CEMF) of 50VDC at rated speed. The armature resistance is 2Ω and the armature inductance is 20mH. Calculate: a) Output voltage with an 80% duty cycle b) Magnitude and direction of the DC armature current with an 80% duty cycle. c) Duty cycle for a forward braking current of 10ADC. (Assume the speed has not changed due to the large inertia of the load.)

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 12.2P

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