A 50-hp 230-volt shunt motor has a field resistance of 177, Ask an Expert

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A 50-hp, 230-volt shunt motor has a field resistance of 17.7 Ω and operates at full load when the line current is 181 A at 1,350 rev/min. To increase the speed of the motor to 1,600 rev/min, a resistance of 5.3 Ω is "cut in" via the field rheostat; the line current then increases to 190 A. Calculate:

a. The power loss in the field and its percentage of the total power input for the 1,350 rev/min speed.

b. The power losses in the field and the field rheostat for the 1,600 rev/min speed.

c. The percent losses in the field and in the field rheostat at 1,600 rev/min.

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Electrical & Electronics, Engineering

Category:- Electrical & Electronics
Reference No.:- M91964664

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