7. Do your results confirm that the speed of the DC Motor/Generator can be controlled by varying the armature voltage using the Thyristor Speed Controller? 8. Do your results confirm that the DC Motor/Generator offers a wide speed range when controlling the armature voltage using the Thyristor Speed Controller?
7. Do your results confirm that the speed of the DC Motor/Generator can be controlled by varying the armature voltage using the Thyristor Speed Controller? 8. Do your results confirm that the DC Motor/Generator offers a wide speed range when controlling the armature voltage using the Thyristor Speed Controller?
Chapter57: Dc Variable-speed Control-motor Drives
Section: Chapter Questions
Problem 4SQ
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Question
please solve q 7 and 8
Transcribed Image Text:4. Set the controls of the Thyristor Speed Controller as follows:
CLOSED LOOP selector:
"O" Position
RUN selector:
"O" Position
FIRING ANGLE:
"MIN" position
5. On the Power Supply, set the main power switch to the "I" (on) position, and increase the voltage
control knob to 120 V.
6. On the Thyristor Speed Controller, adjust the FIRING ANGLE potentiometer so that the armature
voltage increases to 100V in 20V incremental steps as shown in the Table-1.
For each armature voltage setting, measure and record the armature current IA, field current IF,
and motor speed in the following Table:
Table-1:
VA(V)
SPEED
IA(A)
IF(mA)
(r/min)
360
20
205
0.2A
780A
40
니니구
o.3
360
60
713
0.4
360
80
974
0.4
36 o
100
1241
0.42
360
7. Do your results confirm that the speed of the DC Motor/Generator can be controlled by varying
the armature voltage using the Thyristor Speed Controller?
8. Do your results confirm that the DC Motor/Generator offers a wide speed range when controlling
the armature voltage using the Thyristor Speed Controller?
9. Return the FIRING ANGLE potentiometer to MIN. and turn off the Power Supply.
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