A DC shunt motor draws a total current of 100 A and supplied with 500 V. The rated motor speed is 1200 rpm and produce initial torque of 50 N-m. The shunt field resistance is 50 2 and connected to the armature resistance of 0.25 . The total iron, friction and windage losses of the motor is 2 kW. (i) With proper label, sketch an equivalent circuit of the DC motor. (ii) Calculate the armature current. (iii) Calculate the difference of motor efficiency if the motor operates at no-load and full-load. At which condition the motor efficiency is the highest? Justify your answer.

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Q: A DC shunt motor draws a total current of 100 A and supplied with 500 V. The rated motor speed is…

A: Given V=500 V I=100 A Nrated =1200 rpm Rsh=50 Ω Ra=0.25 Ω Losses =2 kW

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A: The solution can be achieved as follows.

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A: Given Data: VT = 160 V Ra = 0.2 ohm Ia = 60 A N = 1517 rpm Ploss = 848 Watt

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.