Question 5 A three-phase, 60-Hz, four-pole induction motor runs at a no-load speed of 1790 rpm and a full-load speed of 1720 rpm. a) Calculate the slip and the electrical frequency of the rotor at no-load and full-load I conditions. b) What is the speed regulation of this motor?

Question 5 A three-phase, 60-Hz, four-pole induction motor runs at a no-load speed of 1790 rpm and a full-load speed of 1720 rpm. a) Calculate the slip and the electrical frequency of the rotor at no-load and full-load I conditions. b) What is the speed regulation of this motor?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Stator and Rotor Magnetic Field

The stator and rotor magnetic field is the resulting magnetic field generated by a system of coils that are symmetrically aligned. They are supplied with polyphase currents. The magnetic field is generated by poly-phase (two or more phases) current or single-phase current. In the latter case, two field stator windings are supplied and two resulting electromagnetic fields are generated beyond the stage.

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A 400 V, 3-phase, 4 pole slip ring induction motor is supplied at rated voltage and frequency. The actual rotor resistance per phase is 3 2 and the stand still rotor reactance per phase is 12 2. Neglect stator resistance, reactance and magnetizing reactance. 1. Determine the value of resistance to be added to the rotor circuit to get the maximum torque at starting. 2. Determine the value of resistance to be added to the rotor circuit to get 75% of the maximum torque at starting.
1. A 10-hp, 4-pole, 25-Hz, 3-Ф induction motor is taking 9,100 watts from the line. The core loss is 290 watts; stator copper loss is 568 watts; rotor copper loss is 445 watts, and the friction and windage loss is 121 watts. Determine the output torque in Newton-meter. 2. For a three-phase induction motor having rotor circuit resistance of 6 ohms, maximum torque occurs at a slip of 0.6. Find the value of standstill rotor circuit reactance. 3. A 4 - pole, 3 - phase, 60 Hz squirrel-cage motor draws 21 A and 7 kW while driving its normal load. Under these conditions, its slip is 2%. When running idle, this motor draws 6 A and 580 W at normal voltage. With its rotor blocked, this motor draws 15 A and 500 W with 50 V applied. What is the output torque of this motor when driving its normal load. 4. A 4-pole, 50 Hz, 3- phase induction motor develops a maximum torque of 110 N-m at 1360 rpm. The resistance of the star-connected rotor is 0.25 Ω /phase. Calicul the value of resistance that must…
Example -6. A three-phase, 60-Hz, four-pole induction motor runs at a no-load speed of 1790 r/min and a full-load speed of 1720 r/min. Calculate the slip and the 8 |Page electrical frequency of the rotor at no-load and full-load conditions. What is the speed regulation of this motor?
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
1. The rotor resistance and reactance per phase of a three-phase wound rotor induction motor are 0.035 and 0.15 ohm respectively. If an additional resistance is added, the starting torque is one half of maximum torque and the full load torque is three-fourth of the maximum. Determine the following: a. Full load speed b. speed at maximum torque c. value of additional resistance per required to achieve these conditions.