(1) A 100hp, 480 V, 60 Hz, 4-pole, delta-connected, 3-phase induction motor is used to drive a conveyor belt for a minin

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1 A 100hp 480 V 60 Hz 4 Pole Delta Connected 3 Phase Induction Motor Is Used To Drive A Conveyor Belt For A Minin 1 (434.37 KiB) Viewed 56 times

(1) A 100hp, 480 V, 60 Hz, 4-pole, delta-connected, 3-phase induction motor is used to drive a conveyor belt for a mining operation. The two-wattmeter method shows a total power consumption of 72 kW, and an ammeter indicates a line current of 76 A. Precise measurements give a rotor speed of 1728 r/min. In addition, the following characteristics are known about the motor: Stator iron losses = 2 kW Windage and friction losses = 1.2 kW Resistance between two stator terminals = 0.12 2 Calculate: (a) Power supplied to the rotor, (b) Rotor I2R losses. (c) Mechanical power supplied to the load, in horsepower, (d) Torque developed at 1728 r/min, and (e) Efficiency 4-