What is stator Voltage Control of induction motor?

What is stator Voltage Control of induction motor?

Stator Voltage Control of Induction Motor is a method for the speed control of induction motor by changing the stator terminal voltage. Stator terminal voltage in this method is changed either by adding a series resistor, series inductor or auto transformer in stator circuit.

How does stator control voltage?

By varying the supplying voltage, the speed can be controlled. The voltage is varied until the torque required by the load is developed, at the desired speed. The torque developed is proportional to the square of the supply voltage and the current is proportional to the voltage.

What is stator current control?

Abstract. The stator current control loop plays an important role in ensuring the quality of electric drives interm of producing fast and adequate required torque. When the current controller provides ideal responses, speed control design subsequently is in charge of improving the system performances.

Where the stator Voltage Control for the speed control of induction motor is suitable for?

constant load drive.

How do you control voltage in a motor?

Thus, the speed of a DC motor can be controlled in three ways:

1. By varying the supply voltage.
2. By varying the flux, and by varying the current through the field winding.
3. By varying the armature voltage, and by varying the armature resistance.

What is V F control?

V/F is abbreviated from voltage/frequency. V/F control is an induction motor control method which ensures the output voltage proportional with the frequency, so it maintains a constant motor flux, preventing weak magnetic and magnetic saturation phenomenon from happening.

How much voltage should a stator put out?

For example a 32-amp stator should put out 18 volts AC (VAC) per each 1000-RPM. At 2000 it should be 36 VAC (18×2). At 3000 RPM it should be 54 VAC (18 X 3).

What is meant by stator frequency control?

The expression for the synchronous speed indicates that by changing the stator frequency also it can be changed. This can be achieved by using power electronic circuits called inverters which convert dc to ac of desired frequency.

Why stator Voltage Control is suitable for speed control of induction motor in fan and pump drive?

Hence, when the supply voltage is decreased to reduce the speed for the same current, the torque developed by the motor is reduced. Therefore, the stator voltage control method is suitable for applications where the load torque decreases with the speed, as in the case of a fan load.

How do you control the speed of a single phase motor?

Capacitor run single phase induction motors are extensively used in low power applications, such as fans, pumps etc. Controlling the voltage applied to the stator of these motors is the main strategy used to control their speed.

What are the different methods of speed control of single phase induction motor?

Speed control from rotor side:

• Rotor rheostat control. This method is similar to that of armature rheostat control of DC shunt motor.
• Cascade operation. In this method of speed control, two motors are used.
• By injecting EMF in rotor circuit.

What is stator voltage control of induction motor?

Stator Voltage Control of an Induction Motor. Stator Voltage Control is a method used to control the speed of an Induction Motor. The speed of a three phase induction motor can be varied by varying the supply voltage.

How to control the speed of an induction motor?

Stator Voltage Control is a method used to control the speed of an Induction Motor. The speed of a three phase induction motor can be varied by varying the supply voltage. As we already know that the torque developed is proportional to the square of the supply voltage and the slip at the maximum torque is independent of the supply voltage.

How to control variable voltage for speed control of single-phase motor?

This condition can be obtained by applying a lower voltage without exceeding the motor current. The variable voltage for speed control of small size motors mainly for single-phase can be obtained by the following methods given below: By connecting an external resistance in the stator circuit of the motor. By using an Auto-transformer.

How does a single phase power supply control a fan motor?

For a single phase supply, two thyristors are connected back to back as shown in the figure below: The domestic fan motors, which are single-phase are controlled by a single-phase Triac Voltage Controller as shown in the figure below: Speed control is obtained by varying the firing angle of the Triac.