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Exercise 29: Refer to the following shunt dc motor: Pout = 10 kW; L = 55 A and constant; Vr= 240 V; no = 1200 r/min; RA = 0.40 n; RE= 100 0; Rad = 100 to 400 n. RA 0.40 0 Re Ry Vr 240 V EA 100 0 If the resistor Radj is adjusted to 175 n what is the rotational speed of the motor at no-load conditions? 1- 2- What is the speed of the motor at full load? 3- If the motor is operating at full load and if its variable resistance Rodj is increased to 250 n, what is the new speed of the motor? Compare the full-load speed of the motor with Radj = 175 0 to the full-load speed with Rodj = 250 n. !!

Exercise 29: Refer to the following shunt dc motor: Pout = 10 kW; L = 55 A and constant; Vr= 240 V; no = 1200 r/min; RA = 0.40 n; RE= 100 0; Rad = 100 to 400 n. RA 0.40 0 Re Ry Vr 240 V EA 100 0 If the resistor Radj is adjusted to 175 n what is the rotational speed of the motor at no-load conditions? 1- 2- What is the speed of the motor at full load? 3- If the motor is operating at full load and if its variable resistance Rodj is increased to 250 n, what is the new speed of the motor? Compare the full-load speed of the motor with Radj = 175 0 to the full-load speed with Rodj = 250 n. !!

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Exercise 29: Refer to the following shunt dc motor: Pout = 10 kW; L = 55 A and constant; Vr= 240 V; no = 1200 r/min; RA = 0.40 0; RE = 100 n; Radj = 100 to 400 n. 0.40 Re Rr EA 100 0 Vr 240 V If the resistor Radj is adjusted to 175 n what is the rotational speed of the motor at no-load conditions? 1- 2- What is the speed of the motor at full load? 3- If the motor is operating at full load and if its variable resistance Rodj is increased to 250 n, what is the new speed of the motor? Compare the full-load speed of the motor with Radj = 175 0 to the full-load speed with Radj = 250 n. 4- If Roa can be adjusted from 100 to 400 n, what are the maximum and minimum no-load speeds possible with this motor? 5- If I is not constant, what is the starting current of this machine if it is started by connecting it directly to the power supply VT? How does this starting current compare to the full-load current of the motor?
Transcribed Image Text:Exercise 29: Refer to the following shunt dc motor: Pout = 10 kW; L = 55 A and constant; Vr= 240 V; no = 1200 r/min; RA = 0.40 0; RE = 100 n; Radj = 100 to 400 n. 0.40 Re Rr EA 100 0 Vr 240 V If the resistor Radj is adjusted to 175 n what is the rotational speed of the motor at no-load conditions? 1- 2- What is the speed of the motor at full load? 3- If the motor is operating at full load and if its variable resistance Rodj is increased to 250 n, what is the new speed of the motor? Compare the full-load speed of the motor with Radj = 175 0 to the full-load speed with Radj = 250 n. 4- If Roa can be adjusted from 100 to 400 n, what are the maximum and minimum no-load speeds possible with this motor? 5- If I is not constant, what is the starting current of this machine if it is started by connecting it directly to the power supply VT? How does this starting current compare to the full-load current of the motor?
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