Q2) A 3- phase, star-connected, 220V, 6-pole, induction motor, has the following constants in 0/phase referred to stator ( R1= 0.3, R2'= 0,15, X1= 0,5, x2'=0,2, Xm=13) The total friction & core losses are 1000 watt, for slip of 2% , compute the output torque, efficiency (you can use the approximate equivalent circuit )?

Q2) A 3- phase, star-connected, 220V, 6-pole, induction motor, has the following constants in 0/phase referred to stator ( R1= 0.3, R2'= 0,15, X1= 0,5, x2'=0,2, Xm=13) The total friction & core losses are 1000 watt, for slip of 2% , compute the output torque, efficiency (you can use the approximate equivalent circuit )?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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The stator resistance of a 1-phase induction motor is 2.5 ohm and its leakage reactance is 2.0 ohm. Onno-load, the motor takes 4 A at 96 V and at 0.25 lagging power factor. The no-load friction andwindage loss is negligible. Under the blocked-rotor condition, the input power is 130 W at 6 A and42 V. obtain the equivalent circuit parameters.
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If the average pole flux of a dc machine with 24 coils, each of which contains 16 windings, 4 poles, double layered parallel winding (duplex lap winding), with a speed of 1000 rpm, is 15mWb, what is the idle winding voltage and (Note: In your operations, two digits after the comma) take it)
Question A 3-phase, 415 V, 4-pole, 50 Hz induction motor draws 5 times the rated current at rated voltage at starting. It is required to bring down the starting current from the supply to 2 times of the rated current using a 3-phase autotransformer. If the magnetizing impedance of the induction motor and no-load current of the autotransformer is neglected, then the transformation ratio of the autotransformer is given by
2. Consider the induction motor drawn below. This is a 460 V, 60 Hz, three-phase, 6-pole motor with a rated speed of 1180 RPM. It will be used, though, on a 50 Hz system. a) Numerically label the equivalent circuit of the motor for 50 Hz operation. b) For nominal (60 Hz) condition, determine the following: Synchronous speed in RPM, and slip. 0.44 Ωj2.7 Ω mmmm j5192 lllll j2.9 2 mmo www 0.36 Ω S
A four-pole, three-phase induction motor drives a turbine load. At a certain operatingpoint the machine has 4 percent slip and 87 percent efficiency. The motor drives aturbine with torque–speed characteristic given by TL = 20 + 0.006ω2,where TL is theload torque at the shaft. Determine:(1) the torque at the motor-turbine shaft.(2) the total power delivered to the turbine.(3) the total power consumed by the motor.
7. The total rotational losses of an induction motor are a combination of ------- A) Friction losses B) Windage losses. D) Stray losses. C) Core losses. 8. The developed mechanical power can be calculated using the equation of- A) PAG - PRCL. B) PAG w sync C) (1-s) PAG. D) 3 E2Gc. 9. For an induction motor, if the synchronous speed is 1800 r/m, and the rotor speed 180rad/sec, then the slip will be: A) 5.5% C) 6% B) 4.5% D) 4% 10. The power losses in the stator part of the induction motor are B) Core losses D) Friction and windage losses A) Stator copper losses C) Air-gap losses
Q2. a) A 415V, 50Hz, 3-phase induction motor supplies its rated power to a load. The rated speed of the motor is 980 rpm. b) Two synchronous generators, G2 and G2, are connected parallelly supplying a load. Generator G1 has a no-load frequency of 50.5 Hz and a slope of 300 MW/Hz. Generator G2 has a no-load frequency of 50.2 Hz and a slope of 500 MW/Hz. The load consumes 250 MW real power. (i) At what frequency does this system operate, and how much power is supplied by each of the two generators? (ii) An additional 100 MW load is added to this power system. What is the new system frequency, and how much power do G1 and G2 supply? (iii) The governor set point of G2 is changed to control system frequency back to 50 Hz. Determine the G2 governor set point.
The armature of a 400V, 6-pole, 25 Hz single-phase series motor is lap-wounded with 504 conductors Motor field winding has effective resistance and leakage reactionance are 0.06 22 and 0.05 12, respectively and has 18 turns. However, the armature winding has a leakage reactance of 0.04 12 and negligible resistance. At rated motor current of 300A, the flux per pole is 0.05 Wb, the short circuit current is 50A and the equivalent current to iron losses is 40A. Find motor speed , torque and efficiency at rated current .
Q1) A 3-phase, star-connected ,220V,6-poles,induction motor has the following constants: (R1=0.32),(R2=0.15).(X1%3D0.50).(X2=0.22),(Xm=132) the total Friction losses+ core losses are( 1000W), the slip is (0.02) determine : 1-the efficiency, 2- the output torque
2.b) Explain the speed control of the induction motor with the PWM method. please write it with computer