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.
What is the application where stator voltage control method for speed control of induction motor is suitable?
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. By the stator voltage control method, the speed of the motor can be varied within a small range.
How is the speed of a 3 phase induction motor controlled by its stator voltage control?
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. Also the energy saving is achieved as the input voltage is controlled.
Why stator voltage control is an insufficient method of induction motor speed control?
This method of speed control is rarely used because small change in speed requires large reduction in voltage, and hence the current drawn by motor increases, which cause over heating of induction motor. 3. Changing the number of stator poles : The stator poles can be changed by two methods 4.
What are the advantages of stator voltage control?
This stator voltage control method is suitable for applications where the load torque decreases with the speed. For example- In the fan load. This method gives a speed control only below the normal rated speed as the operation of the voltages if higher than the rated voltage is not admissible.
Why stator voltage control is an inefficient method?
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.
Why stator voltage control is inefficient?
What is meant by V F control?
A control method that enables preventing reductions in the power factor or efficiency of a motor in a wide range of variable speed operation for changes in the frequency for speed control by outputting a voltage (V/f characteristic) corresponding to the frequency set by a parameter in an Inverter.
What is stator current control?
Constant stator current control for three-phase induction motor drive with fixed exciting current. And one of windings of induction motor is used to detect air gap flux, it corrects stator current to achieve fixed exciting current.
What is the advantage of an induction motor using stator voltage controller?
Which starting method is the best method in induction motor?
1. Direct On Line Starter
- It is simple and cheap starter for a 3-phase induction motor.
- The contacts close against spring action.
- This method is normally limited to smaller cage induction motors, because starting current can be as high as eight times the full load current of the motor.
What is the working principle of induction motor?
Working Principle of an Induction Motor. The motor which works on the principle of electromagnetic induction is known as the induction motor. The electromagnetic induction is the phenomenon in which the electromotive force induces across the electrical conductor when it is placed in a rotating magnetic field.
Why induction motor is called as rotating transformer?
An induction motor is sometimes called a rotating transformer because the stator (stationary part) is essentially the primary side of the transformer and the rotor (rotating part) is the secondary side.
What is the function of stator in a motor?
The stator is the static part of the motor. The main function of the stator is to generate the rotating magnetic field. The stator frame, stator core and stator winding are the three parts of the stator. The stator core support and protect the three-phase winding of the stator.
What is induction motor used for?
An induction motor can be used as an induction generator, or it can be unrolled to form a linear induction motor which can directly generate linear motion. The generating mode for induction motors is complicated by the need to excite the rotor, which begins with only residual magnetization.
