%AY l1.H.WO1.docxH.W. for third Students1. A d.c. series motor is controlled by a chopper. Drive parameters are asfollows:(Ra + Rf) = 0.12kv = 10 mV/A-rad/sVb = 96Vf= 125HZ(a) With an armature torque of 5Nm, the speed is 1500rev/min. What arethevalues of armature current and turn-on time?(b) The shaft torque is increased to 20NM and the chopper on-timeincreasedto hold the armature speed at 1500rev/min. What is the new armaturecurrent and on-time?2. A 60V chopper drives a resistive load of 12fL The chopper frequencyis set to 1 kHz. Calculate the values of average and rms load currentsand load power for a turn-on time of (a) 0.2ms, (b) 0.6ms.3. A step-up chopper is to provide a 48V across a 12Y~load from a 12Vd.c. supply. The chopper inductance is 10tzH and the chopper frequencyis 100kHz. Determine the duty cycle required and the variation ofbattery current during switching, and the maximum and minimumbattery currents

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1. A d.c. series motor is controlled by a chopper. Drive parameters are as follows: (Ra + Rf) = 0.12 kv = 10 mV/A-rad/s Vb = 96V f= 125HZ (a) With an armature torque of 5Nm, the speed is 1500rev/min. What are the values of armature current and turn-on time? (b) The shaft torque is increased to 20NM and the chopper on-time increased to hold the armature speed at 1500rev/min. What is the new armature current and on-time?

1. A d.c. series motor is controlled by a chopper. Drive parameters are as follows: (Ra + Rf) = 0.12 kv = 10 mV/A-rad/s Vb = 96V f= 125HZ (a) With an armature torque of 5Nm, the speed is 1500rev/min. What are the values of armature current and turn-on time? (b) The shaft torque is increased to 20NM and the chopper on-time increased to hold the armature speed at 1500rev/min. What is the new armature current and on-time?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Concept explainers

Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.

Question

%AY l1.
H.WO1.docx
H.W. for third Students
1. A d.c. series motor is controlled by a chopper. Drive parameters are as
follows:
(Ra + Rf) = 0.12
kv = 10 mV/A-rad/s
Vb = 96V
f= 125HZ
(a) With an armature torque of 5Nm, the speed is 1500rev/min. What are
the
values of armature current and turn-on time?
(b) The shaft torque is increased to 20NM and the chopper on-time
increased
to hold the armature speed at 1500rev/min. What is the new armature
current and on-time?
2. A 60V chopper drives a resistive load of 12fL The chopper frequency
is set to 1 kHz. Calculate the values of average and rms load currents
and load power for a turn-on time of (a) 0.2ms, (b) 0.6ms.
3. A step-up chopper is to provide a 48V across a 12Y~load from a 12V
d.c. supply. The chopper inductance is 10tzH and the chopper frequency
is 100kHz. Determine the duty cycle required and the variation of
battery current during switching, and the maximum and minimum
battery currents

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