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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.)

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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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.)      

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