What happens when load on induction motor increases?

When the load on an induction motor is increased from no load to full load, both slip and power factor increase. In the low slip region torque is directly proportional to slip. So as load increases, speed decreases, increasing the slip.

How does slip vary with the load?

The slip of the motor increases with the load. The difference between the synchronous speed and the actual speed of the rotor is known as a slip. When the load is increased on the motor the speed of the rotor falls and the the slip of the motor increase.

What is an effect of increase in load on?

decrease armature current but increase power factor. increase armature current but decrease power factor. increase both its armature current and power factor.

Does the slip increase as the load increases what is the reason of this?

In normal operation with a load the rotor speed always lags the magnetic field’s speed allowing the rotor bars to cut magnetic lines of force and produce a useful torque. Slip increases with increasing load – providing a greater torque.

What causes slip in induction motor?

The interface between the rotor current & revolving magnetic flux can generate torque. Thus, according to Lenz’s law, the rotor starts to turn in the direction of the rotating magnetic field. As a result, the relative speed is equivalent to (Ns – Nr) and it is arranged among them to give rise to slip within the motor.

What is slip in an induction motor?

“Slip” in an AC induction motor is defined as: As the speed of the rotor drops below the stator speed, or synchronous speed, the rotation rate of the magnetic field in the rotor increases, inducing more current in the rotor’s windings and creating more torque. Slip is required to produce torque.

Why increase in load increases efficiency?

The efficiency of the induction increases when the mechanical load increases because as the motors load increases, its slip increases, and the rotor speed falls. Ultimately induction motors are more efficient when they are running closer to synchronous speed i.e. the pullout torque is near synchronous speed.