Single phase induction motors are not self-starting. For self- starting purpose we are adding many components with it. One of the components is a starting winding which will be disconnected when the motor reaches about full operating speed. State the necessity of this winding and what would happen if the start switch, capacitor, or start winding fail to open?

Single phase induction motors are not self-starting. For self- starting purpose we are adding many components with it. One of the components is a starting winding which will be disconnected when the motor reaches about full operating speed. State the necessity of this winding and what would happen if the start switch, capacitor, or start winding fail to open?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter35: Harmonics 916

Section: Chapter Questions

Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...

See similar textbooks

Similar questions

a) Why the slip of induction motor is never zero, b) What happens if the slip of induction motor is one, c)What is the value of the slip for an induction motor at no load and full load.
Explain the principle of operation and constructional features of a three- phase squirrel cage and a three-phase wound rotor (slip ring) induction motor With the aid of diagrams, describe the principle of operation and constructional features of both types of induction motors. Produce a table that compares the two types of three-phase induction motors: cage motor and wound rotor motor. Your comparison should include their constructional features, connections, synchronous speed, slip, losses and efficiency, torque, and speed, starting methods.
What is the reason of the high starting current in the 3-phase induction motor? Explain in short.
what is doubly fed induction motor how it works and also examples based on this motor.
What do you mean by 'static', 'alternating’, and 'rotating' magnetic field? Explain the significances of the rotating magnetic field in rotary machines. What are the purposes of using starter in a three-phase induction motor? With neat diagrams, explain the operation of a Wye-Delta starter for a three phase induction motor.
8. Describe, in detail, how torque is developed in an induction motor, 9. What is slip in an induction motor and how does it vary during the normal operation of the motor? ( 10. How does current flow in the rotor of an induction motor and how and why does the frequency of that current vary? 11. Why is it harder for a synchronous motor to start spinning than an induction motor? Provide details and be specific!
3. Describe types of Starters used in three phase induction motor and their Function. 4. A 3 phase,50HZ ,8 pole induction motor has a full load slip of 4%. The rotor resistance is 0.0012/ph and the standstill reactance 0.0052/ph. Find the speed at which maximum torque occurs.
1. What is the formula for torque production in a single-phase induction motor? Draw a vector diagram for capacitor start single-phase induction motor.2. Which type of starter is popular for using in induction motor and why?
A wound rotor, induction motor has a rotor resistance of 0.6 ohms per phase and a rotor leakage reactance of 8 ohms.a)What is the operating speed (rpm) of this 2-pole induction motor fed from a 50Hz supply if the slip is 5%?b)If maximum torque occurs when R2 = sX2, what is the slip at maximum torque?c)What resistance must be added to the rotor circuit to give maximum startingtorque?
4) It is advisable to avoid line-starting of induction motor and use starter because: A. motor takes five to seven times its full load current B. it will pick-up very high speed and may go out of step C. it will run in reverse direction D. starting torque is very high E. starting speed is very high 5) In a three-phase induction motor, the number of poles in the rotor winding is always: A. zero B. more than the number of poles in stator C. less than number of poles in stator D. equal to number of poles in stator E. two 6) DOL starting of induction motors is usually restricted to: A. low horsepower motors B. variable speed motors C. high horsepower motors D. high speed motors A. variable torque motors
Q4) Is an induction motor self-starting? Clarify this on the Torque/Speed characteristics
What is the relationship between slip s) and load (Pa) in an induction motor? Please explain.