a) The figure below shows the per-phase equivalent circuit of a two- pole three-phase induction motor operating at 50 Hz. The voltage (E1) across the magnetizing inductance is 210 V, and the slip (s) is 0.05. What is the developed torque produced by the motor ? 0.04 0 j0.22 Q j0.22 0 0.05 0 j6.28 Q E E1 b) A 4 poles , 50HZ ,Y-connected three phase induction motor has the per phase equivalent circuit parameters of ( R3= R2= 0.12 , X1 = X2 = 0.6 , Xm =12 ) n and l2 = 20L0°. Use exact equivalent circuit to determine the following at rated slip of 0.03: 1. Stator current II. Magnetizing current II. IV. Developed torque Power factor c) What is the physical meaning for each of the following induction motor parameters: R1 ,R2 ,Rc ,X1 ,X2 ,Xm ?

a) The figure below shows the per-phase equivalent circuit of a two- pole three-phase induction motor operating at 50 Hz. The voltage (E1) across the magnetizing inductance is 210 V, and the slip (s) is 0.05. What is the developed torque produced by the motor ? 0.04 0 j0.22 Q j0.22 0 0.05 0 j6.28 Q E E1 b) A 4 poles , 50HZ ,Y-connected three phase induction motor has the per phase equivalent circuit parameters of ( R3= R2= 0.12 , X1 = X2 = 0.6 , Xm =12 ) n and l2 = 20L0°. Use exact equivalent circuit to determine the following at rated slip of 0.03: 1. Stator current II. Magnetizing current II. IV. Developed torque Power factor c) What is the physical meaning for each of the following induction motor parameters: R1 ,R2 ,Rc ,X1 ,X2 ,Xm ?

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter39: Synchronous Motor Operation

Section: Chapter Questions

Problem 14SQ: Induction motors and welding transformers require magnetizing current, which causes a. lagging power...

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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

100%

a) The figure below shows the per-phase equivalent circuit of a two-
pole three-phase induction motor operating at 50 Hz. The voltage
(E1) across the magnetizing inductance is 210 V, and the slip (s) is
0.05. What is the developed torque produced by the motor ?
0.04 O j0.22 Q
jo.22 0
j6.28 N E E1
0.05 0
V
b) A 4 poles , 50HZ ,Y-connected three phase induction motor has the per
phase equivalent circuit parameters of ( R3= R2= 0.12 , X1 = X2 = 0.6 , Xm
=12 ) N and l2 = 20L0". Use exact equivalent circuit to determine the
following at rated slip of 0.03 :
I. Stator current
II. Magnetizing current
II.
Power factor
IV.
Developed torque
c) What is the physical meaning for each of the following induction motor
parameters: R1 ,R2 ,Rc ,X1 ,X2 ,Xm ?

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