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1) A dc machine with an input power of 12 kW is connected to a 100 V DC supply and is operated as a DC shunt motor. The armature resistance Ra is 0.10 and the shunt field winding resistance is Riw =80 Q. At no-load condition, the motor runs at 1000 rpm, and the armature takes 6 amperes. The magnetization characteristic at 1000 rpm is shown in the figure. a) Find the value of the resistance of the shunt field control rheostat (Rfc). b) Find the rotational losses at 1000 rpm. c) Find the speed, electromagnetic torque, and efficiency of the motor when rated current flows in the armature. (Neglect the field current) 120 Magnetization cunve at 1000 rpm 100 80 60 40 20 0.2 0.4 0.6 0.8 1.0 1.2 14 I. amps

1) A dc machine with an input power of 12 kW is connected to a 100 V DC supply and is operated as a DC shunt motor. The armature resistance Ra is 0.10 and the shunt field winding resistance is Riw =80 Q. At no-load condition, the motor runs at 1000 rpm, and the armature takes 6 amperes. The magnetization characteristic at 1000 rpm is shown in the figure. a) Find the value of the resistance of the shunt field control rheostat (Rfc). b) Find the rotational losses at 1000 rpm. c) Find the speed, electromagnetic torque, and efficiency of the motor when rated current flows in the armature. (Neglect the field current) 120 Magnetization cunve at 1000 rpm 100 80 60 40 20 0.2 0.4 0.6 0.8 1.0 1.2 14 I. amps

Introductory Circuit Analysis (13th Edition)
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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1) A dc machine with an input power of 12 kW is connected to a 100 V DC supply and is operated as a DC shunt motor. The armature resistance Ra is 0.10 and the shunt field winding resistance is Riw =80 Q. At no-load condition, the motor runs at 1000 rpm, and the armature takes 6 amperes. The magnetization characteristic at 1000 rpm is shown in the figure. a) Find the value of the resistance of the shunt field control rheostat (Rfc). b) Find the rotational losses at 1000 rpm. c) Find the speed, electromagnetic torque, and efficiency of the motor when rated current flows in the armature. (Neglect the field current) 120 Magnetization cunve at 1000 rpm 100 80 60 40 20 0.2 0.4 0.6 0.8 1.0 1.2 14 I. amps
Transcribed Image Text:1) A dc machine with an input power of 12 kW is connected to a 100 V DC supply and is operated as a DC shunt motor. The armature resistance Ra is 0.10 and the shunt field winding resistance is Riw =80 Q. At no-load condition, the motor runs at 1000 rpm, and the armature takes 6 amperes. The magnetization characteristic at 1000 rpm is shown in the figure. a) Find the value of the resistance of the shunt field control rheostat (Rfc). b) Find the rotational losses at 1000 rpm. c) Find the speed, electromagnetic torque, and efficiency of the motor when rated current flows in the armature. (Neglect the field current) 120 Magnetization cunve at 1000 rpm 100 80 60 40 20 0.2 0.4 0.6 0.8 1.0 1.2 14 I. amps
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