A 400-V, 50-Hz, four-pole, Y-connected, three phase induction motor is rated at 30 hp The equivalent circuit parameters are Stator resistance= 0.50 2, Stator Reactance= 0.95 2 , XM= 35 N Rotor resistance (referred to stator)= 0.38 2 Rotor Reactance (referred to stator)= 1.15 P(F&W or, rotational) = 350W, P(misc. or, stray) = 120W, Pcore = 320W For 4.2% slip, find the followings.

Delmar's Standard Textbook Of Electricity
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ISBN:9781337900348
Author:Stephen L. Herman
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Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 6RQ: Name three factors that determine the torque produced by an induction motor.
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A 400-V, 50-Hz, four-pole, Y-connected, three phase induction motor is rated at 30 hp.
The equivalent circuit parameters are
Stator resistance= 0.50 2, Stator Reactance= 0.95 2 , XM= 35 2
Rotor resistance (referred to stator)= 0.38 2
Rotor Reactance (referred to stator)= 1.15 e
P(F&W or, rotational) = 350W, P(misc, or, stray) = 120W, Pcore = 320W
For 4.2% slip, find the followings.
I. The Stator line current IL and the stator power factor
II. The stator copper losses PSCL
III. The rotor power factor and The rotor frequency
IV. The air-gap power PAG or, Pgap
V. The power converted from electrical to mechanical form, Pcony
VI. The induced or, the developed torque
VII. The load or, the shaft torque
VIII. The overall machine efficiency, n
Transcribed Image Text:A 400-V, 50-Hz, four-pole, Y-connected, three phase induction motor is rated at 30 hp. The equivalent circuit parameters are Stator resistance= 0.50 2, Stator Reactance= 0.95 2 , XM= 35 2 Rotor resistance (referred to stator)= 0.38 2 Rotor Reactance (referred to stator)= 1.15 e P(F&W or, rotational) = 350W, P(misc, or, stray) = 120W, Pcore = 320W For 4.2% slip, find the followings. I. The Stator line current IL and the stator power factor II. The stator copper losses PSCL III. The rotor power factor and The rotor frequency IV. The air-gap power PAG or, Pgap V. The power converted from electrical to mechanical form, Pcony VI. The induced or, the developed torque VII. The load or, the shaft torque VIII. The overall machine efficiency, n
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