induction motor (squirrel cage induction motor) working principle ,three phase induction motor .

 

An induction motor is an AC electric motor in which a rotating magnetic field is produced by the stator, which induces a current in the rotor, causing it to rotate. The rotor is not connected to any external circuit, but instead consists of a series of conductors or bars, typically made of copper, that are shorted together at each end. When the rotating magnetic field of the stator is applied to the rotor, it induces an electric current in the rotor bars, which in turn produces a magnetic field that interacts with the stator field to produce torque, causing the rotor to turn.

Induction motors are widely used in industrial and commercial applications due to their simplicity, reliability, and low cost. They are used in a wide range of applications, from pumps, fans, and compressors to conveyors, machine tools, and cranes.

There are two main types of induction motors: the squirrel cage motor and the wound rotor motor. In a squirrel cage motor, the rotor bars are permanently short-circuited, while in a wound rotor motor, the rotor windings are connected to external resistors or slip rings that allow for greater control of the motor's speed and torque.

Induction motors are typically characterized by their horsepower rating, speed, and efficiency. They are also classified based on their number of phases (single-phase or three-phase) and their power factor, which is a measure of how efficiently they convert electrical power into mechanical power.

Overall, induction motors are a critical component of modern industrial and commercial infrastructure, providing reliable and efficient power for a wide range of applications.