What happens when load on induction motor is increased?
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. This increases the torque which satisfies the load demand.
When the load of induction motor increases the slip?
Slip increases with increasing load – providing a greater torque. It is common to express the slip as the ratio between the shaft rotation speed and the synchronous magnetic field speed. When the rotor is not turning the slip is 100 %.
When an induction motor is loaded from no load to full load?
When an induction motor is loaded from no load to full load, its speed decreases & slip increases.
When load is increased on a 3 phase induction motor its speed?
With increased load, the load resistance is less and the current increases. In a three-phase induction motor, the rotating magnetic field of the stator passing through the rotor conductors induces a current in the rotor conductors.
Why does motor current increase with load?
If the mechanical load increases, the rotor stops a bit (since it’s harder for the rotor to rotate a heavier load), which decreases the counter-EMF. This reduction in the counter-EMF thus increases the current in the coil, and so the power needed from the external voltage source.
Which is a better method to control motor speed?
Thus, the speed of a DC motor can be controlled in three ways: By varying the supply voltage. By varying the flux, and by varying the current through the field winding. By varying the armature voltage, and by varying the armature resistance.
Which induction motor has maximum speed?
Synchronous and full load speed of amplitude current (AC) induction motors
|Number of Poles||Frequency (Hz, cycles/sec)|
Is an induction motor is operating at a point in the high slip region then the motor will be?
If induction motor is operating at a point in high slip region, then motor will be unstable.