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The following test data were taken on a 7.5-hp, four-pole, 208-V, 60-Hz, Delta connected IM having a rated current of 28 A. DC Test: Voc = 13.6 V No-load Test: loc = 28.0 A f = 60 Hz Pin- 420 W V, = 208 V | = 8.17 A Locked-rotor Test: V, = 25 V 1= 27.9 A f = 15 Hz Pn - 920 W (a) Sketch the per-phase equivalent circuit of this motor. (b) Find the slip at pull-out torque, and find the value of the pull-out torque.

The following test data were taken on a 7.5-hp, four-pole, 208-V, 60-Hz, Delta connected IM having a rated current of 28 A. DC Test: Voc = 13.6 V No-load Test: loc = 28.0 A f = 60 Hz Pin- 420 W V, = 208 V | = 8.17 A Locked-rotor Test: V, = 25 V 1= 27.9 A f = 15 Hz Pn - 920 W (a) Sketch the per-phase equivalent circuit of this motor. (b) Find the slip at pull-out torque, and find the value of the pull-out torque.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Question I The following test data were taken on a 7.5-hp, four-pole, 208-V, 60-Hz, Delta connected IM having a rated current of 28 A. DC Test: Voc = 13.6 V No-load Test: V, = 208 V | = 8.17 A Locked-rotor Test: V, = 25 V | = 27.9 A Ioc = 28.0 A f = 60 Hz Pin = 420 W f = 15 Hz Pin = 920 W (a) Sketch the per-phase equivalent circuit of this motor. (b) Find the slip at pull-out torque, and find the value of the pull-out torque. Question 2 A 460-V, 25-hp, 60-Hz, four-pole A-connected wound-rotor induction motor has the following impedances in ohms per phase referred to the stator circuit R;= 0.6412 R3= 0.3322 X-1.106 Ω X-0.464 Ω X,- 26.3 Ω 1. What is the maximum torque of this motor? At what speed and slip does it occur? 2. What is the starting torque of this motor? 3. If the rotor resistance is doubled, what is the speed at which the maximum torque now occur? What is the new starting torque of the motor? 4. Calculate and plot the T-s c/c for both cases.
Transcribed Image Text:Question I The following test data were taken on a 7.5-hp, four-pole, 208-V, 60-Hz, Delta connected IM having a rated current of 28 A. DC Test: Voc = 13.6 V No-load Test: V, = 208 V | = 8.17 A Locked-rotor Test: V, = 25 V | = 27.9 A Ioc = 28.0 A f = 60 Hz Pin = 420 W f = 15 Hz Pin = 920 W (a) Sketch the per-phase equivalent circuit of this motor. (b) Find the slip at pull-out torque, and find the value of the pull-out torque. Question 2 A 460-V, 25-hp, 60-Hz, four-pole A-connected wound-rotor induction motor has the following impedances in ohms per phase referred to the stator circuit R;= 0.6412 R3= 0.3322 X-1.106 Ω X-0.464 Ω X,- 26.3 Ω 1. What is the maximum torque of this motor? At what speed and slip does it occur? 2. What is the starting torque of this motor? 3. If the rotor resistance is doubled, what is the speed at which the maximum torque now occur? What is the new starting torque of the motor? 4. Calculate and plot the T-s c/c for both cases.
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