A 20-hp, 200-V, shunt wound DC motor has an armature resistance of 0.7 2 and a field resistance of 100Q. The adjustable resistor, Radj can be adjusted from 50 Q to 350 2. Figure 1 shows the motor's circuitdiagram, and Figure 2 illustrates its magnetisation curve.RARaliRrFigure 1: Equivalents circuit of a de motor300280260Speed = 1500 rpm24022020019016014012010080604020o 01 02 03 04 05 06 0.7 08 09 1 11 12 1.3 14 1.5 1.6 1.7 1.8 19 2Figure 2: Magnetization curve of a dc motor. (a) Describe two main differences between a DC shunt-wound and separately-excited motor.(b) Calculate the starting current of this motor if Radj is set to 50 2.(c) Calculate the no-load speed (rpm) using the starting current obtained in (a) above.

GIVEN: a circuit diagram RA=0.7ΩRF=100ΩRadj=50 to 500Ω FIND: (a) two main difference…

2. The adjustable resistor, Radj can be adjusted from 50 2 to 350 2. Figure 1 shows the motor's circui diagram, and Figure 2 illustrates its magnetisation curve. RA Figure 1: Equivalents circuit of a de motor 300 280 260 Speed = 1500 rpm 240 220 200 180 160 140 120 100 80 60 40 20 0 01 02 03 04 05 06 0.7 08 09 I LI 12 13 14 1.5 16 1.7 18 19 2 Figure 2: Magnetization curve of a de motor.

2. The adjustable resistor, Radj can be adjusted from 50 2 to 350 2. Figure 1 shows the motor's circui diagram, and Figure 2 illustrates its magnetisation curve. RA Figure 1: Equivalents circuit of a de motor 300 280 260 Speed = 1500 rpm 240 220 200 180 160 140 120 100 80 60 40 20 0 01 02 03 04 05 06 0.7 08 09 I LI 12 13 14 1.5 16 1.7 18 19 2 Figure 2: Magnetization curve of a de motor.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Concept explainers

Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.

Question

A 20-hp, 200-V, shunt wound DC motor has an armature resistance of 0.7 2 and a field resistance of 100
Q. The adjustable resistor, Radj can be adjusted from 50 Q to 350 2. Figure 1 shows the motor's circuit
diagram, and Figure 2 illustrates its magnetisation curve.
RA
Rali
Rr
Figure 1: Equivalents circuit of a de motor
300
280
260
Speed = 1500 rpm
240
220
200
190
160
140
120
100
80
60
40
20
o 01 02 03 04 05 06 0.7 08 09 1 11 12 1.3 14 1.5 1.6 1.7 1.8 19 2
Figure 2: Magnetization curve of a dc motor.

(a) Describe two main differences between a DC shunt-wound and separately-excited motor.
(b) Calculate the starting current of this motor if Radj is set to 50 2.
(c) Calculate the no-load speed (rpm) using the starting current obtained in (a) above.

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