A 6-pole and three-phase induction motor has synchronous speed of 1235 RPM. a)Find the no-load and full-load operating speed of motor for the cases given, 1.) 2.5Hz electrical frequency of rotor for no-load condition. 2.) 6.3Hz electrical frequency of rotor for full-load condition. b) Find the speed regulation of motor by using parameters found above. c) Determine the electrical frequency of rotor under full-load condition so that speed regulation would be equal to 5%? (Electrical frequency of rotor for no-load condition is still 2.5Hz.)

A 6-pole and three-phase induction motor has synchronous speed of 1235 RPM. a)Find the no-load and full-load operating speed of motor for the cases given, 1.) 2.5Hz electrical frequency of rotor for no-load condition. 2.) 6.3Hz electrical frequency of rotor for full-load condition. b) Find the speed regulation of motor by using parameters found above. c) Determine the electrical frequency of rotor under full-load condition so that speed regulation would be equal to 5%? (Electrical frequency of rotor for no-load condition is still 2.5Hz.)

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...

See similar textbooks

Similar questions

The 1 phase equivalent parameters of a three phase 60 Hz, 6 pole 220, star connected, 7.5 KW asynchronous motor are as follows:a) In the case where slip is 0.03, the stator transferred rotor current, the torque and power induced in the motor.b) Maximum torque and angular velocity at this moment and speed value in rev / min.c) Developing torque and developing load currentd) Draw 1 phase equivalent circuit?
The rotor of a 50 Hz, 4 pole synchronous motor is directly coupled to rotor of 50 Hz, 6 pole induction motor. If stator of both machine are supplied by balanced 30, 50 Hz supply of rated voltage, then possible induced frequencies in rotor of induction motor are a Hz and b Hz. The values of a and b are
The frequency of emf in the stator of a 4 pole, 3 phase induction motor is 50 Hz and that in the motor is 1.5 Hz. Determine (i) the slip and (ii) speed of the motor.
Three Phase Induction Motor Load Test, . At what load will the efficiency be maximum
5- The rotor voltage per phase of a slip-ring star connected induction motor is 289.5 V. The rotor resistance and standstill leakage reactance are 50 and 8 ohm per phase respectively. Determine. (i) the rotor current and power factor at start with slip-rings shorted (ii) the rotor current and power factor at 4% slip with slip-rings shorted (iii) the external rotor resistance per phase required to obtain a starting current of 20 A in the rotor lines.
Problems . If an induction motor is having synchronous speed as 1500 rpm & rotor speed as 1440 rpm, find the % slip.
Be as fast as possible..
g) What is an advantage if the starting Torque of the induction motor is higher than the nominal load Torque? h) What are the main differences when the equivalent circuits of transformer and asynchronous motor are examined?
b) A 415V, 50HZ, 3-phase induction motor supplies its rated power to a constant load. The rated speed of the motor is 980 rpm. Identify the pole number of the motor and calculate the rate slip () (ii) Draw the circuits for the no-load and block-rotor tests and indicate the slip for each of the tests. (iii) If the supply voltage is changed to 332V and 40HZ, calculate the motor speed, slip frequency, and slip.
Which of the following statement is correct for the causes of low power factor? O The power factor of induction motor falls with the decrease of load. O Most of the induction motors operate at leading power factor. O Arc lamps operate at high power factor. O The induction furnaces operate on high power factor.
(e) Explain the principle of operation of a three phase induction motor. (f) Sketch the IEEE recommended and approximate equivalent circuit diagram of induction motor. Label all key components. Then, with the aid of power flow diagram, list all the power and equations associated with the induction motor including the losses.
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