What happens to the rotor of a 3 phase induction motor if its speed attains to synchronous speed?
Table of Contents
- 1 What happens to the rotor of a 3 phase induction motor if its speed attains to synchronous speed?
- 2 What type of rotor is used on a 3 phase motor?
- 3 What is the equation for rotor frequency of 3-phase induction motor?
- 4 Which of the induction motors has three phase winding in rotor?
- 5 When the rotor of three phase induction motor run at synchronous speed what is the value of the slip?
- 6 What is the working principle of a 3 phase rotating rotor?
- 7 How many stator windings are in an electric motor?
What happens to the rotor of a 3 phase induction motor if its speed attains to synchronous speed?
If the rotor reached synchronous speed, there would be no movement of stator field relative to the rotor conductors, and no induced voltage, current or torque. In order that the no-load losses can be met, the rotor attains a speed less than synchronous.
What will happen when a rotor runs at a speed in an induction motor?
If the motor is running at synchronous speed, then the torque generated by the motor equal to zero. If the rotor runs at synchronous speed as the field of the stator, this will cause the slip to become zero, then there will be no torque generated in the rotor.
What type of rotor is used on a 3 phase motor?
Squirrel Cage Rotor
The rotors of the three phase induction motor are further classified as: Squirrel Cage Rotor. Slip Ring Rotor or Wound Rotor or Phase Wound Rotor.
What happens to a 3-phase induction motor if one phase fails during starting?
If a three-phase motor is operating and loses one of the phases, the motor will continue to operate at a reduced speed and experience vibrations. The current will also increase considerably in the remaining phases, causing an internal heating of the motor components.
What is the equation for rotor frequency of 3-phase induction motor?
Explanation: Rotor frequency = s*f1 = 90/60 = 1.5 Hz. rotor speed = 1000(1-0.03) = 970 rpm. 11. A 4-pole, 3-phase slip ring induction motor is used as a frequency changer.
What is rotor in induction motor?
The rotor is a moving component of an electromagnetic system in the electric motor, electric generator, or alternator. Its rotation is due to the interaction between the windings and magnetic fields which produces a torque around the rotor’s axis.
Which of the induction motors has three phase winding in rotor?
Difference between Slip Ring and Squirrel Cage Induction Motor
| Slip ring or phase wound Induction motor | Squirrel cage induction motor |
|---|---|
| The rotor winding is similar to the stator winding | The rotor consists of rotor bars which are permanently shorted with the help of end rings |
What happens when induction motor reaches synchronous speed?
When this happens, there is no longer any torque on the rotor, and its speed drops below the synchronous speed. When the speed is reduced, magnetic flux lines produced by the stator windings again cut the rotor’s windings, inducing a current and the resulting magnetic field. Torque is again established.
When the rotor of three phase induction motor run at synchronous speed what is the value of the slip?
What is a 3-phase induction machine?
3-Phase induction machine construction • 3 stator windings (uniformly distributed as in a synchronous generator) • Two types of rotor: –Squirrel cage –Wound rotor (with slip rings) The rotating magnetic field
What is the working principle of a 3 phase rotating rotor?
The rotor will constantly be turning to align its magnetic field with that of the stator field. • The 3-phase set of currents, each of equal magnitude and with a phase difference of 120o, flow in the stator windings and generate a rotating field will constant magnitude.
How does a 3-phase rotating magnetic field work?
• The 3-phase set of currents, each of equal magnitude and with a phase difference of 120o, flow in the stator windings and generate a rotating field will constant magnitude. The rotating magnetic field • Consider a two-pole.
How many stator windings are in an electric motor?
• 3 stator windings (uniformly distributed as in a synchronous generator) • Two types of rotor: –Squirrel cage –Wound rotor (with slip rings) The rotating magnetic field • The basic idea of an electric motor is to generate two magnetic fields: rotor magnetic field and stator magnetic field and make the stator field rotating.