Answered: A 15 kW, 400 V, 950 RPM , 3 phase, 50…

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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A) At what percentage of slip is the pull-out or breakdown torque of a typical 3-phase squirrel- cage induction motor reached? 21. a) 3% slip b) 10% slip c) 20% slip d) none of the above B) If load is increased beyond the breakdown torque, what happens to the speed of the motor? a) it stops b) it may speed up beyond its rated rpm c) its speed will not change, but its current will go down d) none of the above
On full load, a 300 V series motor takes 90A and runs at 15 rev/s. The armature resistance is 0.1 ohm, and the series winding resistance is 50 mohm. Determine the speed when developing full load torque but with a 0.2-0hm diverter parallel to the field winding. (Assume that the flux is proportional to the field current.
B. The name-plate of a squirrel-cage induction motor has the following information: Rated power: 50 hp; rated voltage: 400 V; rated frequency: 50 Hz; rated speed: 1480 rpm. When the machine is run on no-load at rated voltage, it draws a stator current of 13.5 A at a power factor of 0.16 lagging. The stator winding resistance is 0.1 , the rotor winding resistance is 0.05 , the stator leakage inductance is 2 mH and the rotor leakage inductance is 2 mH. i. What is the synchronous speed of this machine? Calculate the no-load losses of the machine. ii. iii. Calculate the magnetizing inductance of this machine. iv. Calculate the stator current and its power factor when the machine runs at rated speed. Neglect the core-loss resistance in your calculation. V. vi. Calculate the rotor current and its power factor when the machine runs at rated speed. Calculate the developed torque when the machine runs at rated speed. Calculate the efficiency of the machine when it runs at rated speed. vii.

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A 15 kW, 400 V, 950 RPM , 3 phase, 50 Hz, 6 pole Cage motor with 400 V applied takes 6 times full load current at standstill and develops 1.8 times the full load running torque. The full load current is 32 A. What voltage must be applied to produce full load torque at starting?