At what condition the speed of a 3phase induction motor operates at stable region?

At what condition is the speed of a 3 phase induction motor operated at a stable region?

remains constant. When the motor is in stable region, the power delivered is constant. Therefore speed of induction motor is inversely proportional to the load torque.

In which region induction motor operation is stable?

Normally an Induction Motor is designed to operate at low full load slip ranging from 0.02 to 0.05 under normal operating condition. Figure above shows the slip-torque characteristics of an Induction Motor. Normal operating region is shown from s=0 to s=smT by solid line.

In which region IM operation is stable?

Due to unstable conditions, motor comes to standstill condition at such a load. Hence i.e. maximum torque which motor can produce is also called breakdown torque or pull out torque. So range s = 0 to s = sm is called low slip region, known as stable region of operation. Motor always operates at a point in this region.

In which of the following region induction motor operation is stable and unstable?

Running torque 1. Therefore under low slip region motor operates in stable region. 2. Therefore under high slip regions motor operates in unstable region.

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What is standstill rotor EMF?

When rotor is stationary i.e. s = 1, the frequency of rotor e.m.f. is the same as that of the stator supply frequency. The value of e.m.f. induced in the rotor at standstill is maximum because the relative speed between the rotor and the revolving stator flux is maximum.

Which induction motor has maximum speed?

Synchronous and full load speed of amplitude current (AC) induction motors

Speed (rpm)
Number of Poles Frequency (Hz, cycles/sec)
Synchronous Full Load
2 3600 2900
4 1800 1450

What happens if fifth harmonics is given to induction motor?

It will rotates in normal operation. Either short circuit or open circuit occurs. The sinusoidal components having frequency five times of fundamental are known as fifth harmonics. … Hence induction motor will rotates in reverse direction because of reverse phase sequence of fifth harmonics.

What would happen if induction motor is made to run at synchronous speed?

Due to this difference in flux, the rotor will experience a torque and will start to rotate at speed less than synchronous speed due to lagging. So, theoretically, the Induction motor can never run at synchronous speed. … This will result in no torque on the rotor, and it will stop moving due to this.

Which DC motor is preferred for constant speed?

Explanation: Rotary compressor generally demand constant speed operation throughout the load. Sometimes, DC machines are not able to produce constant speed throughout the process hence, synchronous machine is used. 4.

What is power flow diagram?

The power flow diagram shows the losses of the motor. The input and output of the motor are explained in the power flow diagram. Three-phase voltage and currents are used for the input power of the motor.

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What is low slip region?

(a) Low-slip region

At synchronous speed s = 0, the torque will be zero. When the speed is very near to synchronous speed, the slip is very low and (sX20)2 is negligible in comparison with R2. Therefore, When k2 = k1/R2. From the above relation, we can see that the torque is proportional to the slip.