Given a motor that is a 15-HP 1720-rpm 440-volt 60-Hz 4-pole three-phase wye-connected induction with the following per-phase parameters: Stator resistance = 0.2 ohms Stator leakage reactance = 0.5 ohms Rotor resistance (referred to stator) = 0.3 ohms Rotor reactance (referred to stator) = 0.6 ohms Magnetizing reactance = 30 ohms Core losses ≈ 0 Rotational losses = 30 watts, constant with respect to the motor's load. (Note: use 1 HP = 746 watts) a. At full load conditions, find: (1) the developed torque, (2) the magnitude of the rotor current, referred to the stator, (3) the magnitude of the stator current b. What will be the slip at maximum-torque condition? (in percent)
Given a motor that is a 15-HP 1720-rpm 440-volt 60-Hz 4-pole three-phase wye-connected induction with the following per-phase parameters: Stator resistance = 0.2 ohms Stator leakage reactance = 0.5 ohms Rotor resistance (referred to stator) = 0.3 ohms Rotor reactance (referred to stator) = 0.6 ohms Magnetizing reactance = 30 ohms Core losses ≈ 0 Rotational losses = 30 watts, constant with respect to the motor's load. (Note: use 1 HP = 746 watts) a. At full load conditions, find: (1) the developed torque, (2) the magnitude of the rotor current, referred to the stator, (3) the magnitude of the stator current b. What will be the slip at maximum-torque condition? (in percent)
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter8: Basic Electric Motors
Section: Chapter Questions
Problem 28RQ: What are the advantages and disadvantages of using the following types of motors?
shaded-pole...
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Given a motor that is a 15-HP 1720-rpm 440-volt 60-Hz 4-pole three-phase wye-connected induction with the following per-phase parameters:
Stator resistance = 0.2 ohms
Stator leakage reactance = 0.5 ohms
Rotor resistance (referred to stator) = 0.3 ohms
Rotor reactance (referred to stator) = 0.6 ohms
Magnetizing reactance = 30 ohms
Core losses ≈ 0
Rotational losses = 30 watts, constant with respect to the motor's load.
(Note: use 1 HP = 746 watts)
a. At full load conditions, find: (1) the developed torque, (2) the magnitude of the rotor current, referred to the stator, (3) the magnitude of the stator current
b. What will be the slip at maximum-torque condition? (in percent)
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