When supplied from a source with the rated voltage and frequency, a 3 phase, 93 Kw, 400 , Y-Connected, 50 Hz, 4 Pole, Squirrel Cage induction motor provides its rated shaft power t the rated rotor speed of 1463 rpm. Friction and windage losses accounted for 4% of rated ower. The resistances of the stator and referred rotor are the same. The impedance of the hunt branch is sufficiently high that the excitation current may be neglected. So please do the alculation; a) The Operating Slip? b) The Gross-Power? c) The Air-Gap power?

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
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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When supplied from a source with the rated voltage and frequency, a 3 phase, 93 Kw, 400
V, Y-Connected, 50 Hz, 4 Pole, Squirrel Cage induction motor provides its rated shaft power
at the rated rotor speed of 1463 rpm. Friction and windage losses accounted for 4% of rated
power. The resistances of the stator and referred rotor are the same. The impedance of the
shunt branch is sufficiently high that the excitation current may be neglected. So please do the
calculation;
a) The Operating Slip?
b) The Gross-Power?
c) The Air-Gap power?
d) The Rated Electromagnetic Torque?
e) The Rotor Copper Loss?
f) The Input Power?
g) The Full-Load Efficiency?
h) How much shaft power does the motor provide at the rated speed if the stator voltage
magnitude is dropped to half the rated vaļue?
Transcribed Image Text:When supplied from a source with the rated voltage and frequency, a 3 phase, 93 Kw, 400 V, Y-Connected, 50 Hz, 4 Pole, Squirrel Cage induction motor provides its rated shaft power at the rated rotor speed of 1463 rpm. Friction and windage losses accounted for 4% of rated power. The resistances of the stator and referred rotor are the same. The impedance of the shunt branch is sufficiently high that the excitation current may be neglected. So please do the calculation; a) The Operating Slip? b) The Gross-Power? c) The Air-Gap power? d) The Rated Electromagnetic Torque? e) The Rotor Copper Loss? f) The Input Power? g) The Full-Load Efficiency? h) How much shaft power does the motor provide at the rated speed if the stator voltage magnitude is dropped to half the rated vaļue?
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