Your question: Why stator Voltage Control is inefficient?

What are the disadvantages of stator voltage control?

Disadvantages of this method is that the smooth speed control is not possible . This method is more costly and less efficient as two different stator winding are required. This method of speed control can only be applied for squirrel cage motor.

How does stator control voltage?

By the stator voltage control method, the speed of the motor can be varied within a small range. As the operation of the motor at voltages higher than the rated voltage is not permissible, thus this method allows the speed control only below the rated speed of the motor.

Why is VF ratio kept constant?

Higher flux than its rated capacity leads to increased eddy current and hysteresis losses. The increased losses cause the heating of the core and as a result of this the insulation of core will get damaged. Therefore, when motor running through VFD the V/f ratio is kept constant.

Which of the following is the disadvantages of rotor resistance control?

The major disadvantage of the rotor resistance control method is that the efficiency is low because of the additional losses present in the resistors connected within the rotor circuit. The efficiency is greatly reduced at low speeds because of the higher value of the slip.

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What are the advantages of armature voltage control method?

Additional advantages of armature controlled DC motors include: Constant field current and torque: With the armature control method, the field current and torque levels remain constant throughout the application. Regardless of the speed of the motor, you can rely on these factors.

What is the function of a stator?

The stator is the coil of wire housed inside the engine case. A magnet on a shaft spins within the stator, creating alternating current (AC). That current travels along fairly heavy gauge wire through the case and into the rectifier/regulator which converts it to DC power, and at a consistent output.

How is the speed of a 3 phase induction motor controlled by its stator voltage control?

Induction motors are constant speed motors, hence if we desire to use these motors for variable speed applications, the speed can be vary by using AC power controllers. As the torque is directly proportional to the square of the voltage, the torque can be varied with stator voltage, so, in turn, the speed.

Who has least range of speed control?

________ has least range of speed control.

  • A. Slip ring induction motor.
  • Synchronous motor.
  • D.C. shunt motor.
  • Schrage motor.

What will happen if air gap is increased in an induction motor?

The permeability of the magnetic circuit will decrease if the air gap of the motor is increased. The magnetizing inductance of the motor decreases. … The air gap will have a decrease in magnetic flux.

Which motor is most suitable for best speed control?

3. Constant V/F control of induction motor. This is the most popular method for controlling the speed of an induction motor. As in above method, if the supply frequency is reduced keeping the rated supply voltage, the air gap flux will tend to saturate.

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