What happens if load is suddenly removed?

If the load of an Induction motor is suddenly withdrawn then the motor will run in No-Load condition. In No-Load a motor speed is closer to the synchronous speed i.e. for a 4 Pole motor the synchronous speed is 1500 rpm.

What happens when suddenly load given to the induction motor?

Sudden change load on a motor shaft, which occurs during operation period, results in speed change of the other motors that fed from the same grid. Direct starting of induction motors on isolated electrical grid, as well as sudden change load, caused voltage dips and also reduces speed of aggregate.

What is the effect on the speed of an induction motor running on no load as supply voltage is reduced?

Under the no-load condition, the equivalent circuit of the induction motor is shown below. As the supply voltage decreases, the no-load stator current also decreases. As the supply voltage decrease, the slip will increase, and hence the speed will decrease.

What will happen if suddenly load is removed from the DC shunt motor?

The DC motor will continue its rotation if it is at NO LOAD. If you have a large armature power supply so the fuses did not blow, on light load the motor would speed up and self destruct due to centrifugal forces. Similar to a DC series motor when the load is disconnected from the shaft.

What happens when motor load increases?

As the load is increased, the motor will slow down, and the torque will increase. Current into the motor will also increase. If the load is increased above the maximum, the motor may overheat after a while.

When load on an induction motor increases its slip will?

1. 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. Since the rotor speed is slower, there is more relative motion between the rotor and the stator magnetic fields in the machine.

How the speed of the motor change from no load to full load?

If the load is applied to the DC motor or machine, the speed of the motor decreases automatically. Thus to maintain the constant speed, the difference between no-load and full-load speed (called Speed Regulation) should be maintained very less.

What happened when induction motor run on no load?

As the motor is running at no load, the total input power is equal to the constant iron loss, friction, and windage losses of the motor. Since the power factor of the induction motor under no-load condition is generally less than 0.5, thus the Wattmeter reading of one of the Wattmeter will show a negative reading.

What happens if the motor speed up to its no load speed?

The motor will speed up to its no-load speed, which may damage the motor. At no-load, the load is actually whatever friction is in the motor such as from bearings, brushes, and air resistance. This friction mostly heats the motor.

What happens if you cut the supply for a DC motor?

In a DC shunt motor if you cut the supply for the field winding, the speed would dangerously increase in order to maintain the back emf of the motor. For a constant back emf, flux is inversely proportional to the speed of motor.

When is an a motor considered underloaded?

A motor is considered underloaded when it is in the range where efficiency drops significantly with decreasing load. Fig- ure 2 shows that power factor tends to drop off sooner, but less steeply than efficiency, as load decreases. Figure 1 Motor Part-Load Efficiency (as a Function of \% Full-Load Efficiency)

Why does a DC motor stop accelerating when there is no load?

When it reaches that speed, it stops accelerating, in fact if the load overruns the motor, the motor brakes the load, holding it back and in so doing also becomes a generator returning power to the DC li Because the rpm of series field DC motor tends to run away without a load.