A 3-phase, Y-connected, 55-Hp, 460-V, 60-Hz, 4-pole wound rotor induction motor has the following impedances in 2/phase referred to the stator circuit: Ri=0.641 2 Xı=1.106 Q Rc neglected R2=0.332 2 X2=0.464 N XM=26.3 2 This motor is excited by a 3-phase, Y-connected, 440-V 50-Hz voltage sources. By using approximate equivalent circuit, calculate; a. Maximum torque and corresponding slip and rotor speed, b. Starting torque and draw the torque-speed curve and show these parameters, c. The input active power and efficiency at 12 percent of slip.

A 3-phase, Y-connected, 55-Hp, 460-V, 60-Hz, 4-pole wound rotor induction motor has the following impedances in 2/phase referred to the stator circuit: Ri=0.641 2 Xı=1.106 Q Rc neglected R2=0.332 2 X2=0.464 N XM=26.3 2 This motor is excited by a 3-phase, Y-connected, 440-V 50-Hz voltage sources. By using approximate equivalent circuit, calculate; a. Maximum torque and corresponding slip and rotor speed, b. Starting torque and draw the torque-speed curve and show these parameters, c. The input active power and efficiency at 12 percent of slip.

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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Concept explainers

Single Phase Induction Motor

The single-phase induction motor or engine consists of a single rotating phase in the stator and a rotating cage in the rotor. When phase one supply is connected to the stator winding, a magnetic field is generated. In the pulsating field, the rotor does not rotate due to inertia. So, a single-phase import motor does not start and requires some initial methods.

Question

A 3-phase, Y-connected, 55-Hp, 460-V, 60-Hz, 4-pole wound rotor induction motor has the following
impedances in 2/phase referred to the stator circuit:
Ri=0.641 2
Xı=1.106 Q
Rc neglected
R2=0.332 2
X2=0.464 N
XM=26.3 2
This motor is excited by a 3-phase, Y-connected, 440-V 50-Hz voltage sources. By using approximate
equivalent circuit, calculate;
a. Maximum torque and corresponding slip and rotor speed,
b. Starting torque and draw the torque-speed curve and show these parameters,
c. The input active power and efficiency at 12 percent of slip.

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