A factory is to replace 42 identical conventional three‐phase induction motors with the same rating and number more efficient induction motors. Evaluate the value of power taken from the factory supply by the all 42 new motors. The information for the new motors as supplied by the manufactures is: 40 kW, 4‐pole, 1440 rev/min 50‐Hz, Y‐, friction and windage torque of 24 N.m on the shaft. The stator losses are equal to the rotor circuit losses. Assume full‐load output at rated speed. Determine the efficiency of each new motor.
A factory is to replace 42 identical conventional three‐phase induction motors with the same rating and number more efficient induction motors. Evaluate the value of power taken from the factory supply by the all 42 new motors. The information for the new motors as supplied by the manufactures is: 40 kW, 4‐pole, 1440 rev/min 50‐Hz, Y‐, friction and windage torque of 24 N.m on the shaft. The stator losses are equal to the rotor circuit losses. Assume full‐load output at rated speed. Determine the efficiency of each new motor.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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A factory is to replace 42 identical conventional three‐phase induction motors with the
same rating and number more efficient induction motors. Evaluate the value of power taken
from the factory supply by the all 42 new motors. The information for the new motors as
supplied by the manufactures is: 40 kW, 4‐pole, 1440 rev/min 50‐Hz, Y‐, friction and
windage torque of 24 N.m on the shaft. The stator losses are equal to the rotor circuit
losses. Assume full‐load output at rated speed. Determine the efficiency of each new
motor.
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