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Question: 83 the nameplate information on a threephase 60 hz induction...

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8.3 The nameplate information on a three-phase, 60 Hz, induction motor is: 15 HP, 1755 RPM, 460 volts, 18 amps, 88.5% efficient. Assuming nameplate conditions, a) How many poles in the motor? (4 poles) b) what is the slip? (2.5%) c) What is the motor power factor? (0.88 lag) d) What is the output torque? (60.9 N-m) 8.4 A three-phase, 480 volt, 60 Hz, 50 HP induction motor draws 70 amps at 0.80 lagging power factor. Stator and rotor copper losses are 4200 and 1000 watts respectively. Core loss is 3000 watts, windage and friction is 800 watts. Determine the following: a) Air gap power (42,358 watts) b) Mechanical power developed (41,358 watts) c) Shaft output power (37,558 watts) d) Efficiency of the motor. (80.7%)

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