Why stator voltage control is an inefficient method of induction motor speed control
Answers
Stator Voltage Control is a method used to control the speed of an Induction Motor. ... Hence, to reduce the speed for the same value of the same current, the value of the voltage is reduced and as a result, the torque developed by the motor is reduced.
Answer:
Therefore, it is reduced the same value of same current and the value of voltage also decreased also the torque developed.
Explanation:
What is stator voltage control?
A technique for regulating an induction motor's speed is Stator Voltage Control. By changing the supplied voltage, a three-phase induction motor's speed can be adjusted.
The slip at the highest torque is independent of the supply voltage and is proportional to the square of the torque created. The supply voltage fluctuation has no effect on the motor's synchronous speed.
Function of stator voltage control:
The methods listed below can be used to obtain variable voltage for small size motors, primarily single-phase, speed control:
- By connecting an external resistance in the stator circuit of the motor.
- By using an Auto-transformer.
- By using a Thyristor voltage controller.
- By using a Triac Controller.
Stator voltage control is an inefficient method of induction motor speed control when the voltage value is decreased, the torque produced by the motor is also decreased in order to decrease the speed for the same value of the same current.
Hence, it is reduced the same value of same current and the value of voltage also decreased also the torque developed.
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