Table of Contents
What factors affect induction motor performance?
Motor performance depends on three elements such as voltage across terminals, resistance across terminals, and magnetic force.
What is the function of the stator in an AC motor?
In an electric motor, the stator provides a magnetic field that drives the rotating armature; in a generator, the stator converts the rotating magnetic field to electric current. In fluid powered devices, the stator guides the flow of fluid to or from the rotating part of the system.
What is the function of the rotor in an AC induction motor?
The rotor then is the rotating part of the AC motor. The objective of these motor components is to make the rotor rotate which in turn will rotate the motor shaft. This rotation will occur because of the previously discussed magnetic phenomenon that unlike magnetic poles attract each other and like poles repel.
What is the relationship between the stator and the rotor speeds in an asynchronous motor?
The dc current in the stator generates a stationary magnetic flux in the motor air gap. Rotation of the rotor in this field induces ac currents in its windings. The frequency of these currents decreases with rotor speed so as to set up a magnetic field that is stationary with respect to the stator.
What is stator voltage control?
Stator Voltage Control is a method used to control the speed of an Induction Motor. 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 the function of stator and rotor?
The stator and rotor both are the parts of the electrical motor. The significant difference between the rotor and the stator is that the rotor is the rotating part of the motor whereas the stator is the stationary part of the motor.
What is the difference between rotor and stator?
What is the difference between stator and rotor?
How to calculate the synchronous speed of an induction motor?
The relationship to calculate the SS of an induction motor is: 1 SS = (120 X f) / P Where: SS = Synchronous Speed (RPM) f = frequency (cycles / second) = 60 P = number of poles (pole pairs) Examples: For a 2 pole motor: For an 8 pole motor: The rotor in an induction motor can not turn at the synchronous speed.
How does an induction motor work?
The induction motor is made up of the stator, or stationary windings, and the rotor. The stator consists of a series of wire windings of very low resistance permanently attached to the motor frame. As a voltage and a current is applied to the stator winding terminals, a magnetic field is developed in the windings.
What is the efficiency of AC induction motor?
Two important attributes relating to efficiency of electricity use by A.C. Induction motors are efficiency (η), defined as the ratio of the mechanical energy delivered at the rotating shaft to the electrical energy input at its terminals, and power factor (PF).
What is the working principle of a rotary motor?
In turn, a current is produced in the rotor bars and shorting ring and another magnetic field is induced in the rotor with an opposite polarity of that in the stator. The magnetic field, revolving in the stator, will then produces the torque which will “pull” on the field in the rotor and establish rotor rotation.