Chess. loss 4-pole Q-1. A 440 V, 50 Hz, 37.3 Kw, 3-phase, star-connected induction motor has per phase stator impedance Z₁= (01+ j0.4)2 and per phase rotor impedance referred to stator Z ₂= (0.15+ j0.44). The motor has stator core loss of 1250 W and rotational loss of 1000W. It draws a no load line current of 20 A at p.f. 0.09 lagging with slip 3%. Using approximate equivalent circuit, calculate: (1) stator current and stator power factor (2) power output and efficiency (3) torque developed. aly power input = stetos -euloss - coreloss مرا

Chess. loss 4-pole Q-1. A 440 V, 50 Hz, 37.3 Kw, 3-phase, star-connected induction motor has per phase stator impedance Z₁= (01+ j0.4)2 and per phase rotor impedance referred to stator Z ₂= (0.15+ j0.44). The motor has stator core loss of 1250 W and rotational loss of 1000W. It draws a no load line current of 20 A at p.f. 0.09 lagging with slip 3%. Using approximate equivalent circuit, calculate: (1) stator current and stator power factor (2) power output and efficiency (3) torque developed. aly power input = stetos -euloss - coreloss مرا

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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2. The star-connected rotor of an induction motor has a standstill impedance of (0.4+j4) ohm per phase and the rheostat impedance per phase is (6+j2) ohm. The motor has an induced e.m.f. of 80 V between slip-rings at standstill when connected to its normal supply voltage. Find (a) rotor current at standstill with the rheostat in the circuit (b) when the slip-rings are short-circuited and the motor is running with a slip of 3%. 3. A4-pole, 50-Hz induction motor has a full-load slip of 5%. Each rotor phase has a resistance of 0.3 Q and a standstill reactance of 1.2 Q. Find the ratio of maximum torque to full-load torque and the speed at which maximum torque occurs. 4. A 3-phase, 4-pole, 50-Hz induction motor has a star-connected rotor. The voltage of each rotor phase at standstill and on open-circuit is 121 V. The rotor resistance per phase is 0.3 and the reactance at standstill is 0.8 N. If the rotor current is 15 A, calculate the speed at which the motor is running. Also, calculate the…
2. The star-connected rotor of an induction motor has a standstill impedance of (0.4 + j4) ohm per phase and the rheostat impedance per phase is (6+j2) ohm. The motor has an induced e.m.f. of 80 V between slip-rings at standstill when connected to its normal supply voltage. Find (a) rotor current at standstill with the rheostat in the circuit (b) when the slip-rings are short-circuited and the motor is running with a slip of 3%. 3. A4-pole, 50-Hz induction motor has a full-load slip of 5%. Each rotor phase has a resistance of 0.3 Q and a standstill reactance of 1.2 Q. Find the ratio of maximum torque to full-load torque and the speed at which maximum torque occurs. [5.27 A ; 3.3 A] [2.6 ; 1125 r.p.m.]
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