Q1. а. The dc motor with the shunt connection has the following parameters: Voltage terminal, VT = 240 V Line current, IL = 100 A Armature resistance, RA = 0.14 Q Field resistance, RF = 200 Q Adjustable resistance, Radj = 0 to 300 2 No load speed, no = 1200 rpm The internal generated voltage EA and field current characteristics graph is shown in FIGURE Q1.

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Q1.
а.
The dc motor with the shunt connection has the following parameters:
Voltage terminal, VT = 240 V
Line current, IL = 100 A
Armature resistance, RA = 0.14 Q
Field resistance, RF = 200 Q
Adjustable resistance, Radj = 0 to 300 Q
No load speed, no = 1200 rpm
The internal generated voltage Ea and field current characteristics graph is
shown in FIGURE Q1.
300
Speed = 1200 rimin
250
200
150
100
50
0.0
0.25
0.5
0.75
1.00
1.25
1.50
Field Current, A
FIGURE Q1
i.
Calculate the no-load speed of this motor when Radj = 120 Q.
ii.
Calculate the full-load speed when the motor Radj = 120 Q.
ii.
Under no-load conditions, determine the range of possible speeds
can be achieved by adjusting Radj?
Internal generated voltage E, V
Transcribed Image Text:Q1. а. The dc motor with the shunt connection has the following parameters: Voltage terminal, VT = 240 V Line current, IL = 100 A Armature resistance, RA = 0.14 Q Field resistance, RF = 200 Q Adjustable resistance, Radj = 0 to 300 Q No load speed, no = 1200 rpm The internal generated voltage Ea and field current characteristics graph is shown in FIGURE Q1. 300 Speed = 1200 rimin 250 200 150 100 50 0.0 0.25 0.5 0.75 1.00 1.25 1.50 Field Current, A FIGURE Q1 i. Calculate the no-load speed of this motor when Radj = 120 Q. ii. Calculate the full-load speed when the motor Radj = 120 Q. ii. Under no-load conditions, determine the range of possible speeds can be achieved by adjusting Radj? Internal generated voltage E, V
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