QUIZ DC Machines 4 May 2015
1
King Fahd University of Petroleum & Minerals Electrical Engineering Department Second Semester-142 EE-306 (Quiz #4) Student Name: Student ID# 1. A DC series motor is rated at 230 V, 9 hp and 1200 rpm. The armature and series field resistances are 0.25 Ω and 0.1 Ω respectively. It is connected to a 230 V supply, and it draws a current of 40 A while delivering the rated horse power at the rated speed. a) Draw the equivalent circuit of the motor. (1 point) b) Determine the armature voltage and copper losses in the machine. (3 points) c) Calculate the converted power and the corresponding induced torque. (3 points) d) Find the rotational losses and the motor efficiency. (3 points)
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Transcript of QUIZ DC Machines 4 May 2015
King Fahd University of Petroleum & MineralsElectrical Engineering Department
Second Semester-142EE-306 (Quiz #4)
Student Name: Student ID#
1. A DC series motor is rated at 230 V, 9 hp and 1200 rpm. The armature and series field resistances are 0.25 Ω and 0.1 Ω respectively. It is connected to a 230 V supply, and it draws a current of 40 A while delivering the rated horse power at the rated speed.
a) Draw the equivalent circuit of the motor. (1 point)
b) Determine the armature voltage and copper losses in the machine. (3 points)
c) Calculate the converted power and the corresponding induced torque. (3 points)
d) Find the rotational losses and the motor efficiency. (3 points)
