9. A variable-speed drive system uses a d.c. motor which is supplied from a variable voltage source. The torque and power profiles are shown in Fig, 11.7. The drive speed is varied from 0 to 1750 rpm (base-speed) by varying the terminal voltage (from 0 to 600V) with the field current maintained constant, (a) Determine the motor armature current if the torque is held constant at 250 Nm up to the base-speed. (b) The speed beyond the base-speed is obtained by field weakening while the armature voltage is held constant at 600 V. Determine the torque available at a speed of 2500 rpm if the armature current is held constant at the value obtained in part (a). Neglect all losses. [Ans: (a) 76.35 A, (b) 175 Nm]
9. A variable-speed drive system uses a d.c. motor which is supplied from a variable voltage source. The torque and power profiles are shown in Fig, 11.7. The drive speed is varied from 0 to 1750 rpm (base-speed) by varying the terminal voltage (from 0 to 600V) with the field current maintained constant, (a) Determine the motor armature current if the torque is held constant at 250 Nm up to the base-speed. (b) The speed beyond the base-speed is obtained by field weakening while the armature voltage is held constant at 600 V. Determine the torque available at a speed of 2500 rpm if the armature current is held constant at the value obtained in part (a). Neglect all losses. [Ans: (a) 76.35 A, (b) 175 Nm]
Introductory Circuit Analysis (13th Edition)
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i need the answer quickly
![9.
A variable-speed drive system uses a d.c. motor which is supplied from a
variable voltage source. The torque and power profiles are shown in
Fig, 11.7. The drive speed is varied from 0 to 1750 rpm (base-speed) by
varying the terminal voltage (from 0 to 600V) with the field current
maintained constant,
(a) Determine the motor armature current if the torque is held
constant at 250 Nm up to the base-speed.
(b) The speed beyond the base-speed is obtained by field weakening
while the armature voltage is held constant at 600 V. Determine
the torque available at a speed of 2500 rpm if the armature
current is held constant at the value obtained in part (a). Neglect
all losses.
[Ans: (a) 76.35 A, (b) 175 Nm]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe59b2086-20e2-4841-a0fe-23f5463974d5%2F1e2e0741-a6dd-4f4f-8e51-f57b5c2af40e%2F8u45k_processed.jpeg&w=3840&q=75)
Transcribed Image Text:9.
A variable-speed drive system uses a d.c. motor which is supplied from a
variable voltage source. The torque and power profiles are shown in
Fig, 11.7. The drive speed is varied from 0 to 1750 rpm (base-speed) by
varying the terminal voltage (from 0 to 600V) with the field current
maintained constant,
(a) Determine the motor armature current if the torque is held
constant at 250 Nm up to the base-speed.
(b) The speed beyond the base-speed is obtained by field weakening
while the armature voltage is held constant at 600 V. Determine
the torque available at a speed of 2500 rpm if the armature
current is held constant at the value obtained in part (a). Neglect
all losses.
[Ans: (a) 76.35 A, (b) 175 Nm]
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