(c) A 50 HP, 250 V, 1200 r/min, DC shunt motor has an armature resistance of 0.06 2. Its field circuit has a total resistance (Radj + RF) of 50 2, which produces a no-load speed of 1200 rpm. (i) Sketch an equivalent circuit of the motor. (ii) Deploying the understanding of a DC shunt motor, demonstrate the derivation steps of the formula for output speed, wn versus induced torque, tind of the motor. (iii) Calculate the motor speeds when the input current at 100 A, 200 A, and 300 A. (iv) Using the results obtained from Q3(c)(ii, plot the torque-speed curve of the motor.

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(c) A 50 HP, 250 V, 1200 r/min, DC shunt motor has an armature resistance of 0.06 2. Its
field circuit has a total resistance (Radj + Rp) of 50 Q, which produces a no-load speed
of 1200 rpm.
(i)
Sketch an equivalent circuit of the motor.
(ii) Deploying the understanding of a DC shunt motor, demonstrate the derivation
steps of the formula for output speed, wn versus induced torque, Tind of the
motor.
(iii) Calculate the motor speeds when the input current at 100 A, 200 A, and 300 A.
(iv) Using the results obtained from Q3(c)(iii), plot the torque-speed curve of the
motor.
Transcribed Image Text:(c) A 50 HP, 250 V, 1200 r/min, DC shunt motor has an armature resistance of 0.06 2. Its field circuit has a total resistance (Radj + Rp) of 50 Q, which produces a no-load speed of 1200 rpm. (i) Sketch an equivalent circuit of the motor. (ii) Deploying the understanding of a DC shunt motor, demonstrate the derivation steps of the formula for output speed, wn versus induced torque, Tind of the motor. (iii) Calculate the motor speeds when the input current at 100 A, 200 A, and 300 A. (iv) Using the results obtained from Q3(c)(iii), plot the torque-speed curve of the motor.
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