A DC, separately excited motor is used to drive a constant-torque load. The field circuit is excited by a full-wave, AC/DC SCR converter. The armature circuit of the motor is connected to a constant dc voltage source of 160 V. The inductance of the field circuit is large, and the field current is continuous. The field AC voltage (input to the converter) is 127 V (rms), and the field resistance is 110 2. The armature resistance is 2.2 2. When the triggering angle of the SCRS is adjusted to zero, the motor speed is 1300 rpm, and the armature current is 13 A. • Calculate the average current and dc power of the field circuit when the triggering angle is i, A equal to 15°. La Ra Va I = 1.04 Lf Pf = 110.89 W M F2 • If the motor speed is to be increased to 1700 rpm, what is the triggering angle? A2 (a) Circuit a =

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 12.4P
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A DC, separately excited motor is used to drive a constant-torque load. The field circuit is excited by a full-wave, AC/DC SCR
converter. The armature circuit of the motor is connected to a constant dc voltage source of 160 V. The inductance of the
field circuit is large, and the field current is continuous. The field AC voltage (input to the converter) is 127 V (rms), and the
field resistance is 110 N. The armature resistance is 2.2 N. When the triggering angle of the SCRS is adjusted to zero, the
motor speed is 1300 rpm, and the armature current is 13 A.
A1
• Calculate the average current and dc power of the field circuit when the triggering angle is
equal to 15°.
La
Ra
If
1.04
A
Va
M
P¡ =
110.89
W
A2
If the motor speed is to be increased to 1700 rpm, what is the triggering angle?
(a) Circuit
a =
Transcribed Image Text:A DC, separately excited motor is used to drive a constant-torque load. The field circuit is excited by a full-wave, AC/DC SCR converter. The armature circuit of the motor is connected to a constant dc voltage source of 160 V. The inductance of the field circuit is large, and the field current is continuous. The field AC voltage (input to the converter) is 127 V (rms), and the field resistance is 110 N. The armature resistance is 2.2 N. When the triggering angle of the SCRS is adjusted to zero, the motor speed is 1300 rpm, and the armature current is 13 A. A1 • Calculate the average current and dc power of the field circuit when the triggering angle is equal to 15°. La Ra If 1.04 A Va M P¡ = 110.89 W A2 If the motor speed is to be increased to 1700 rpm, what is the triggering angle? (a) Circuit a =
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