Importance of slip in induction motor

The stater of the machine will produce RMF (Rotating magnetic field), due to the 1degree phase shift in the 3-phase supply input. Now this RMF rotates along the stater with its own speed called syn. Induction motor works on the concept of mutual induction i. EMF responsible for producing the torque is induced in the rotor and not supplied externally like DC mot.

The difference between synchronous spe.

A brief overview of how an induction generator works before we get to the answer : an induction motor will work as an induction generator when the speed of the rotor exceeds that of the stator magnetic field i.

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The stator and the rotor are two main components in an AC induction motor. The rotor accelerates until the magnitude of induced rotor current and torque balances the applied mechanical load on the rotation of the rotor. Since rotation at synchronous speed would result in no induced rotor current, an induction motor always operates slightly slower than synchronous speed.

In very simple terms, without slip an induction motor would not be able to develop any torque!

At low values, slip is directly proportional to the rotor resistance, stator voltage frequency and load torque, and inversely proportional to the second power of supply voltage. The traditional way to control wound-rotor- induction - motor speed is to increase slip by adding resistance in the rotor circuit. The AC induction motor is often referred to as the workhorse of the industry because it offers users simple, rugged construction, easy maintenance, and cost- effective pricing.

If the rotor is at the same speed as the magnetic field then slip is zero. The slip cannot reach zero, and it will continue to drive the rotor in electrical induction motors. If the slip goes down as low as zero, the rotor field begins to catch th.

Why the region of 0- slip is depicted as stable region? However, the rotor never succeeds in catching up the synchronous speed.

Relative speed be the difference between symchronous speed and . This phenomenon is called as crawling of an induction motor. This action is due to the fact that, flux wav. Here Ns is the synchronous speed of induction motor. Related QuestionsMore Below.

Why induction motor produces pulsating torque when 5th, 7th, 11th, 13th voltage harmonics is applied to it?

What is slip in an induction generator? We know that induction motor behave as induction generator at super synchronous speed (speed greater than synchronous speed). And at synchronous speed it does not work as motor as well as generator.

SQUIRREL CAGE INDUCTION MOTOR : 1. Constructional feature is very simple. Starting torque is poor, while running torque is better. Power factor is moderate(–). The two main types of AC motors are induction motors and synchronous motors.

A Slip Ring induction motor can be started with external resistance added in its rotor circuit.

But how does external resistance aid in better starting characteristics ? Read here to know about the starting arrangement and the role played by the external resistances in obtaining better starting characteristics. One of the main classifications of Asynchronous motors are the slip ring induction motors. Do you know what happens to slip ring motor when external resistance is added?

Also Know about the special constructional features of the rotor. Also appreciate the external resistances and carbon brush .